DE102009001453A1 - Glow plug control device for use with glow plug control system for internal combustion engine, comprises regeneration activation unit for controllable switching of electrical load - Google Patents

Abstract

The glow plug control device comprises a regeneration activation unit for controllable switching of an electrical load, such that an electrical load of a battery (21) charged by the internal combustion engine (10) is increased for increasing the temperature of exhaust gases during an execution of regeneration operation of the filter unit (19a) to separate the trapped particles from the filter unit. The glow plugs (20) are provided, which are switched during a start of the internal combustion engine.

Description

BACKGROUND OF THE INVENTION

1. TECHNICAL FIELD OF THE INVENTION

The The present invention relates to glow plug control devices and glow control systems, and more particularly a glow plug control device and an annealing control system for controlling a turn-on a glow plug provided in a diesel engine (diesel engine).

2. Description of the stand of the technique

In the prior art, a DPF apparatus for receiving (trapping) particulates (particulate matter, particulate matter, PM) discharged from a diesel engine (diesel engine) has been known. With such a DPF device, a demand for performing a regenerative operation for burning PM occurs when the trapped PM exceeds a given level. In order to meet such a demand, there has been proposed a fuel injection control as shown in FIG Japanese Patent Application Publication No. 2006-152891 is disclosed. In such a fuel injection control, a main injection injection is initially performed, and a post injection is initiated at a subsequent time (time course) to force an increase in exhaust gas temperatures to allow compulsory burning of the trapped particulates. to remove them.

Of the Inventor has extensive studies of lifting techniques the temperatures of exhaust gases, in addition to the execution a post-injection, an operation to carry out a Main injection with an increased fuel volume operated. These detailed studies turned out to be out that simple performing the main injection with an increased fuel volume an increase the engine speed (hereinafter referred to as "NE" is) with a consequent increase in discomfort caused to the driver. In particular, while performs driving the vehicle at a low speed in idle mode or the like, an increase of the rotational speed to an increase of discomfort at the driver.

SUMMARY OF THE INVENTION

The The present invention has been made in consideration of described above and has the task of a glow plug control device and a glow control system to minimize an increase in engine speed during an execution of a regenerative operation a DPF device.

below are means and benefits to tackle the above described point described.

According to one First embodiment of the present invention is assumed That is, a glow plug control device in a glow plug is applied in a combustion chamber of an internal combustion engine is installed, the internal combustion engine from a filter device (DPF: Diesel particulate filter) for trapping particles (particulate matter, Fine dust) is built up in exhaust gases. According to the The first aspect of the present invention is a regeneration activating device provided for controllably switching on an electrical load, an electrical load during execution a regenerative operation charged by the internal combustion engine Battery to increase, thus the temperatures of the exhaust gas be raised so that trapped particles from the filter device be removed. The glow plugs will be during a starting of the internal combustion engine are turned on and are also turned on as an electrical load during execution to serve the regenerative operation.

With In such a construction, the electrical load becomes controllable during turned on the execution of the regenerative operation, that the electrical load of the battery, by the as a drive source acting internal combustion engine is loaded, is increased. This makes it possible even during execution the regenerative operation by performing a main injection with an increased fuel volume, the speed increase to minimize.

Further, according to the first aspect of the present invention, the glow plugs are turned on during starting of the internal combustion engine and also turned on to serve as the electric load during the execution of the regenerative operation. That is, the original purpose of the glow plugs is to preheat the combustors to aid in the initial ignitability of the engine during start-up thereof. Besides these purposes, the glow plugs are used as electrical loads for carrying out the regenerative operation of the filter device. In contrast to a concept of the present invention, if the headlights of the vehicle were used as electrical loads, the regenerative operation would be carried out with the consequence that, in the counter to the intent of the driver to turn on the headlights while driving the vehicle. On the other hand, according to the present invention, even if the regenerative operation is performed with the occurrence of the operation of the glow plugs during the running of the vehicle, since the glow plugs are used as the electric loads as described above, there is no danger of the driver feeling uncomfortable. This enables the suppression of the speed increase during the execution of the regenerative operation taking into consideration the above-described point.

The turning on of the glow plugs results in a flow of a large electric current, which causes switching elements that switch the on states of the glow plugs to develop heat (see FIGS Japanese Patent Application Laid-Open Publication No. 2006-153293 ). Therefore, there is a fear that the heat tends to over-develop in the switching elements, so that they may be damaged. Further, if the glow plugs are turned on to serve as electrical loads during the execution of the regenerative operation of the DPF as described above, the execution of the regenerative operation of the DPF results in an extreme increase in the ambient temperatures around the glow plugs. The inventor has found through research that the attempt to carry out the first aspect of the present invention results in a likelihood of thermal damage occurring in the switching element.

According to such Findings become according to a second embodiment the present invention switching elements for each input and Turning off the glow plugs and a switch-on control device for controlling the switch-on processes (of the switch-on operation) the switching elements and a determination device for determining provided if a high temperature anomaly condition exists at the temperatures of the switching elements exceed a predetermined given temperature. The switch-on control device has a switch-on limiting device for limiting on-duty ratio rates of the glow plugs when the determining means determines that the high-temperature anomaly condition is available.

One Such structure can advantageously the occurrence of a due to thermal damage to the switching elements a Einschalteffekts the glow plugs under a high temperature environment prevent.

there occurs when carrying out an investigation or inquiry, if there is a high temperature anomaly condition, if an attempt is made, which flows through the switching elements electrical Measure currents to when the measured electrical Current values exceed thresholds to determine that a high temperature anomaly is present, a point in one below described manner on. That is, if ambient temperatures around the switching elements are at high levels, the temperatures rise of the switching elements (hereinafter also referred to as "element temperatures") are) even if the measured currents are the same Have values. That said, it's difficult to get accurate element temperatures by referring to the flowing through the switching elements Predict current values. Therefore, it insists on the basis determination of such current values a need for selecting the switching elements each with a permissible Heat resistance performance such that even at a predicted maximum ambient temperature no Error or failure takes place. Therefore, it is difficult to switch elements which are low cost and low in thermal resistance performance. at an alternative, there is a need for preparation or production of heat radiating devices such as a heat sink or the like having high radiation capacities. Especially leads an attempt to turn on the glow plugs as the electrical loads during execution of the regenerative operation to the occurrence of by the switching elements flowing electricity, with ambient temperatures at extreme remain high states. Therefore, if there is an attempt is made to determine whether a high temperature anomaly is present in the switching element by relying on a value of a by the switching elements flowing electrical current A need exists for selecting a switching element having thermal resistance performance with extremely high thermal resistance.

Around to meet such a point is, according to a Third embodiment of the present invention, a temperature detection device provided for detecting the temperature of the switching element, wherein the determining means is responsive to the temperature detecting means detected temperature for determining whether the high-temperature anomaly state is available.

With such a structure, the temperature detecting means directly detects the temperatures (element temperatures) of the switching elements. This enables the element temperatures to be obtained more accurately than those obtained when the presence of the high temperature anomaly is determined based on the electric current values flowing through the switching elements. Therefore There is no need to select the switching elements each having an increased heat resistance, thereby achieving a reduction in the heat resistance performance or the radiation capacity required for the heat radiating device such as the heat sink or the like.

According to one Fourth aspect of the present invention, the regeneration activating device preferably a turn-on control on a variety of electrical Loads including the glow plugs during perform the execution of the regenerative operation, wherein the regeneration activating device preferably has switch-on duty ratios (On-load ratio rates) of other electrical loads except the glow plugs in the presence of a High temperature anomaly state increases to levels that are greater as those of the electrical loads for normal operation are.

With such a structure increases the plurality of electrical Loads the capacity of the electrical loads, resulting in a Ability to adequately achieve another Suppression of the speed increase than the one which is achieved when the electrical load with Use of a single electrical load is increased.

Farther can provide concrete examples of the implementation of Switch-on control in the presence of the plurality of others electrical loads, preferably a simultaneous increase of power-shift ratio rates of the variety of other electrical Loads in the presence of the high temperature anomaly condition (according to a fifth embodiment of the present invention) and alternately Increasing power factor ratio rates of the plurality the other electrical loads to the Einschalttastverhältnis from any of the variety of other electrical loads To increase the presence of the high temperature anomaly condition (According to a sixth embodiment of the present Invention).

at such examples allows the other to turn on electrical loads that increase the electrical Preferably, load is compensated during regenerative operation even if the on states of the glow plugs are due to the high temperature anomaly are limited.

there can be concrete examples of the other electrical Loads preferably an electric heater (intake air heating) to overheat intake air entering the combustion chambers is pulled, an electric heater (seat heating) for heating a passenger or driver's seat of the vehicle, an electric Heater (windshield heater) attached to a rear windshield is attached, and an electric fan of a heater fan and so on. The operation of these electrical loads during the regenerative operation leads to the consequence that, for example the headlights turned on contrary to the intention of the driver which causes an uncomfortable feeling to the driver.

Around to meet such a point is, according to a Seventh embodiment of the present invention, the regeneration activating device allows the other electrical loads from turning on to interrupt for normal operation even if the high temperature anomaly condition is present. this makes possible a reduction in the opportunities of operating the other electrical Loads during regenerative operation, causing the Minimizing opportunities that could cause that the driver has an uncomfortable feeling, as stated above has been described. In addition, even if the Glow plugs are operated as the electrical loads, no unpleasant feeling in the driver caused.

According to one eighth embodiment of the present invention, the regeneration activating device preferably a time during which the electrical load in the presence of the high temperature anomaly condition will expand to a value greater than that of the electrical load for normal operation is.

With such a configuration, even if the power-on states the glow plugs limited due to the high temperature anomaly are, the time interval in which the electrical loads are switched on, extended, which is preferably an increase in electrical loads compensated during regenerative operation.

According to one Ninth embodiment of the present invention, the regeneration activating device preferably the execution of the regenerative operation delay when the high temperature anomaly condition exists is.

One such construction prevents the electrical loads during of the regenerative operation increase under a condition in which controlled the turn-on of the glow plugs become.

concrete Examples of limiting the switch-on states the glow plugs may preferably turn off of the switching element or a reduction of the Einschalttastverhältnisses of the power-on state (according to a tenth embodiment) of the present invention).

This realized in a simple way an effect that the switch-on be zeroed or reduced.

According to one 11th Embodiment of the present invention, the turn-on control device preferably the operation of the switching device on the basis control a command signal output from a command control device, and if the power-on restriction device is in contrast to a command content of the command signal executes the turn-on limit, the turn-on control means output a DIAG signal to the command control device to to communicate the execution of the switch-on limit.

With Such a structure, it is when switching on the electric Loads during regenerative operation possible, to control the switch-on states of the electrical loads, which match a DIAG signal (diagnostic signal).

According to one twelfth embodiment of the present invention can the internal combustion engine preferably a plurality of cylinders formed with combustion chambers, in which the Glow plugs are mounted, and the turn-on control device output the DIAG signal for each of the glow plugs.

With Such a structure can be the electrical loads controllable and sensitive to be turned on in a way that matches the DIAG signal. That means that the electric Power consumed with the other electrical loads regulated depending on the number of glow plugs can be due to the occurrence of high temperature anomaly not remain operable. According to an alternative become the switch-on duty of the glow plugs, which does not stop the operation due to the high temperature anomaly increased in areas that have no errors in the glow plugs causing, which is made possible with the glow plugs to regulate power consumption to be consumed.

In general, when the glow plug is turned on for the purpose of assisting initial ignitability, a duty cycle of a turn-on signal is rapidly increased stepwise (see FIG. 19 (b) ). When this occurs, an inrush current flows through the glow plug, and therefore the electric power consumption of the glow plug increases for a few seconds (see FIG. 19 (a) ). However, when the glow plug is turned on during the execution of the regenerative operation as described above, if the electric power consumption increases due to the inrush current, a fluctuation in the magnitude of the electric load occurs. This is reflected in a fluctuation in the rotational speed when an effort is made to suppress the speed increase during the execution of the regenerative operation.

In view of the above, according to a thirteenth aspect of the present invention, at the start of turning on the glow plugs with the execution of the regenerative operation, duty ratios for turning on the switching elements are gradually increased (see FIG. 19 (d) ). This prevents the electric power consumption of the glow plug from rising for a few seconds due to the inrush current (see FIG. 19 (c) ). Therefore, it becomes possible to prevent a fluctuation in the magnitude of the electric load that occurs when the glow plug is turned on during the execution of the regenerative operation.

A Fourteenth embodiment of the present invention is characterized characterized in that the glow plugs (at start glow) be turned on so that they the initial Ignition of the internal combustion engine during a Assisting starting it, and also (afterglow) be turned on to burns in the internal combustion engine even during a period of time after starting (aft-startup period) to stabilize.

there occurs when trying to control according to the State of the art with the element temperature to perform with reference to the flowing through the switching element Current value, there is a need for a current threshold, on the basis of which the high-temperature anomaly is to be determined, takes a high value as described above. However, the attempt leads to the execution of afterglow in the controller according to the prior art the occurrence of a fear that an electric Current that is slightly lower than the current threshold, continuous for a long period of time (time after starting) flows. In In such a case there is a risk that in the switching element an impairment or the like although it is not determined that there is a high temperature anomaly.

According to the Fourteenth Embodiment of the present invention, the element temperature becomes direct detects why the presence of a high-temperature anomaly be accurately detected even in such afterglow can, thereby allowing the duty cycle of the Glow plug is suitably limited.

In this connection, examples of a case in which the afterglow is performed may be a phase that occurs in an internal combustion engine is applied with a low compression ratio, and include another phase in which the internal combustion engine is operated at high altitude with thin air. This is due to the fact that even if the engine starts during start-up glow, these phases have a risk that a misfire will occur in the absence of subsequent afterglow.

Around to encounter the point that occurs when the high temperature anomaly is detected in the afterglow, it is more preferable the duty cycle of the turn-on signal is selected in such a way is that it is smaller than that of the applied to the switching element Off signal is. This is because interrupting the Off state leads to the occurrence of a misfire. If the high-temperature anomaly is present, the fuel injection timing (fuel injection timing) may be further preferably be changed such that a stabilized Combustion is achieved. In addition, the turn-on ratio can the glow plug for afterglow preferably be selected so that it is smaller than that of Glow plug for the start glow is to to achieve a stabilized combustion while the occurrence the high-temperature anomaly is prevented.

According to one fifteenth embodiment of the present invention will a glow plug control system with the glow plugs and / or the filter device and / or the glow plug control device provided.

With Such a glow plug control system can the same advantageous effects as those mentioned above be achieved.

Brief description of the drawings

These and other features and advantages of the present invention with reference to the following description with reference to the attached Drawings clearly. Show it:

1 a schematic representation of a machine system to which a glow plug control device according to a first embodiment of the present invention is applied.

2 shows a block diagram illustrating a function of an in 1 GDU shown.

3 FIG. 12 is a cross-sectional view illustrating a hardware construction of FIG 1 GDU shown.

4 FIG. 14 is a flowchart showing a basic procedure of a high-temperature abnormality determination routine executed by the glow plug control apparatus according to the first embodiment of FIG 1 is performed.

5 FIG. 12 is a flowchart illustrating a basic flow of a high temperature abnormality determination routine according to a second embodiment of the present invention. FIG.

6 (a) FIG. 12 is a waveform showing a command signal used in the glow plug control apparatus according to the second embodiment. FIG.

6 (b) FIG. 15 is a waveform illustrating an actual turn-on signal used when turning on a switching element of the glow plug control device according to the second embodiment. FIG.

7 FIG. 15 is a block diagram illustrating a plurality of electrical loads to which a glow plug control device according to a third embodiment of the present invention is applied.

8 (a) FIG. 15 is a waveform showing a command signal used in the glow plug control apparatus according to the third embodiment. FIG.

8 (b) FIG. 15 is a waveform showing a DIAG signal used in the glow plug control apparatus according to the third embodiment. FIG.

9 (a) FIG. 15 is a waveform showing a first command signal output from an ECU for controlling a first electric load (glow plug) in the glow plug control device according to the third embodiment.

9 (b) FIG. 15 shows a waveform representing a first turn-on signal supplied from a first control IC for turning on a first switching element used in the glow plug control device according to the third embodiment.

9 (c) FIG. 12 is a waveform showing a DIAG signal output from a first control IC to an ECU installed in the glow plug control device according to the third embodiment.

9 (d) FIG. 15 shows a waveform showing a second command signal outputted from the ECU for controlling a second electric load in the FIG Glow plug control device according to the third embodiment represents.

9 (e) FIG. 14 is a waveform showing a second turn-on signal supplied from a second control IC for turning on a second switching element used in the glow plug control device according to the third embodiment.

9 (f) FIG. 15 is a waveform showing a third command signal output from the ECU to control a third electric load in the glow plug control device according to the third embodiment. FIG.

9 (g) FIG. 15 shows a waveform to which a third turn-on signal supplied from a third control IC is supplied to turn on a third switching element used in the glow plug control device according to the third embodiment.

10 FIG. 12 is a flowchart illustrating a basic flow of control of on states of various electrical loads to which the third embodiment of the present invention is applied.

11 (a) FIG. 12 is a waveform showing a first command signal output from an ECU for controlling a first electric load (glow plug) in a glow plug control device according to a fourth embodiment of the present invention. FIG.

11 (b) FIG. 12 is a waveform showing a first ON signal supplied from a first control IC used in the glow plug control apparatus according to the fourth embodiment. FIG.

11 (c) FIG. 15 is a waveform showing a DIAG signal output from a first control IC to an ECU included in the glow plug control device according to the fourth embodiment. FIG.

11 (d) FIG. 12 is a waveform showing a second command signal output from the ECU for controlling a second electric load in the glow plug control device according to the fourth embodiment. FIG.

11 (e) FIG. 12 is a waveform showing a second turn-on signal supplied from a second control IC for turning on a second switching element used in the glow plug control device according to the fourth embodiment.

11 (f) FIG. 12 is a waveform showing a third command signal output from the ECU for controlling a third electric load in the glow plug control device according to the fourth embodiment. FIG.

11 (g) FIG. 15 is a waveform showing a third turn-on signal supplied from a third control IC for turning on a third switching element used in the glow plug control device according to the fourth embodiment.

12 FIG. 12 is a flow chart illustrating a basic flow of control of ON states of various electrical loads to which the fourth embodiment of the present invention is applied. FIG.

13 (a) FIG. 12 is a waveform showing a first command signal output from the ECU for controlling a first electric load (glow plug) in a glow plug control device according to a fifth embodiment of the present invention.

13 (b) FIG. 15 shows a waveform representing a first turn-on signal supplied from a first control IC to turn on a first switching element used in the glow plug control device according to the fifth embodiment.

13 (c) FIG. 15 is a waveform showing a DIAG signal output from a first control IC to an ECU included in the glow plug control device according to the fifth embodiment. FIG.

13 (d) FIG. 15 is a waveform showing a second command signal output from the ECU for controlling a second electric load in the glow plug control device according to the fifth embodiment. FIG.

13 (e) FIG. 15 is a waveform showing a second ON signal supplied from a second control IC for turning on a second switching element used in the glow plug control device according to the fifth embodiment. FIG.

13 (f) FIG. 15 is a waveform showing a third command signal output from the ECU for controlling a third electric load in the glow plug control device according to the fifth embodiment. FIG.

13 (g) shows a waveform that a third supplied from a third control IC third Turning ON signal for turning on a third switching element, which is used in the glow plug control device according to the fifth embodiment.

14 FIG. 12 is a flow chart showing a basic flow of control of on states of various electrical loads to which the fifth embodiment according to the present invention is applied.

15 (a) FIG. 12 is a waveform showing a first command signal output from the ECU for controlling a first electric load (glow plug) in a glow plug control device according to a sixth embodiment of the present invention. FIG.

15 (b) FIG. 12 is a waveform showing a first turn-on signal supplied from a first control IC for turning on a first switching element used in the glow plug control device according to the sixth embodiment.

15 (c) FIG. 15 is a waveform showing a DIAG signal output from a first control IC to an ECU incorporated in the glow plug control device according to the sixth embodiment. FIG.

15 (d) FIG. 15 is a waveform showing a second command signal outputted from the ECU for controlling a second electric load in the glow plug control device according to the sixth embodiment. FIG.

15 (e) FIG. 12 is a waveform showing a second ON signal supplied from a second control IC for turning on a second switching element used in the glow plug control device according to the sixth embodiment. FIG.

15 (f) FIG. 15 is a waveform showing a third command signal outputted from the ECU for controlling a third electric load in the glow plug control device according to the sixth embodiment. FIG.

15 (g) FIG. 12 is a waveform showing a third turn-on signal supplied from a third control IC for turning on a third switching element used in the glow plug control device according to the sixth embodiment.

16 FIG. 12 is a flow chart showing a basic flow of control of ON states of various electrical loads to which the sixth embodiment according to the present invention is applied.

17 (a) FIG. 12 is a waveform showing a first command signal output from the ECU for controlling a first electric load (glow plug) in a glow plug control device according to a seventh embodiment of the present invention.

17 (b) FIG. 15 is a waveform showing a first turn-on signal supplied from a first control IC for turning on a first switch element used in the glow plug control device according to the seventh embodiment.

17 (c) FIG. 15 is a waveform showing a DIAG signal output from a first control IC to an ECU incorporated in the glow plug control device according to the seventh embodiment. FIG.

17 (d) FIG. 15 is a waveform showing a second command signal output from the ECU for controlling a second electric load in the glow plug control device according to the seventh embodiment. FIG.

17 (e) FIG. 12 is a waveform showing a second ON signal supplied from a second control IC for turning on a second switching element used in the glow plug control device according to the seventh embodiment. FIG.

17 (f) FIG. 15 is a waveform showing a third command signal outputted from the ECU for controlling a third electric load in the glow plug control device according to the seventh embodiment. FIG.

17 (g) FIG. 12 is a waveform showing a third turn-on signal supplied from a third control IC for turning on a third switching element used in the glow plug control device according to the seventh embodiment.

18 FIG. 12 is a flow chart showing a basic procedure for controlling on states of various electric loads to which the seventh embodiment according to the present invention is applied.

19 (a) to 19 (d) FIG. 10 is a time chart showing a control routine to be executed with a glow control apparatus according to an eighth embodiment of the present invention. FIG.

20 FIG. 12 is a block diagram illustrating a function of a GDU forming part of a glow control apparatus according to a ninth embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

below are glow control devices and glow control systems according to various embodiments of the present invention in detail with reference described on the accompanying drawings. However, the present Invention not on the embodiments described below be limited, but can technical concepts according to the present Invention in combination with other known techniques or others Technique can be implemented, the functions equivalent to such known techniques.

embodiments

below are the glow control devices according to various concrete embodiments, the present invention implement, detailing with reference to the attached Drawings described. In the description below the same reference numerals the same corresponding component parts in the different representations.

First embodiment

A glow plug control device according to a first embodiment of the present invention will be described below with reference to FIG 1 to 4 described. The present invention is implemented in a concrete form of an engine system (internal combustion engine system) mainly comprising a vehicle-mounted diesel engine (diesel engine), a detailed structure of which is described below. First, an overall structure of such a machine system according to the present embodiment is explained with reference to FIG 1 described.

As it is in 1 is shown has a diesel engine 10 an air inlet duct 11 on that via an inlet valve (intake valve) 12 with a combustion chamber 15 connected in a cylinder block 13 is shaped and with a piston 14 is delimited or defined. The combustion chamber 15 has an upper end portion to which a leading end 16a a fuel injection valve 16 protrudes (sticks out) to fuel into the combustion chamber 15 inject. After the fuel injection valve 16 Fuel into the combustion chamber 15 injects, the piston moves 14 upwards to fuel in the combustion chamber 15 to compress, whereupon autoignition occurs in the fuel to generate mechanical energy. This mechanical energy is called the rotational energy of an output shaft (crankshaft) 17 the diesel engine 10 extracted. In this case, gases resulting from the combustion of fuel, through an exhaust passage 19 (Exhaust port) discharged when an exhaust valve 18 is opened. A DPF device (diesel particulate filter device) 19a is on the exhaust duct 19 for capturing particles (particulate matter, PM) in the exhaust duct 19 installed exhaust gases.

Furthermore, the cylinder block carries 13 a glow plug on it 20 that is a leading end 20a that is in the combustion chamber 15 projects. A glow plug drive unit (hereinafter referred to as "GDU") 30 is with a battery 21 connected to a turn-on state of the glow plug 20 produce or interrupt. During a cold start of the diesel engine 10 gets the glow plug 20 electric power for preheating the combustion chamber 15 fed. This allows that into the combustion chamber 15 drawn air fuel mixture has an improved initial ignitability. In addition, according to the present embodiment, the diesel engine 10 a variety of cylinders on which the glow plugs 20 each attached.

A crank angle sensor 24 is on the cylinder block 13 in an area in close proximity to the crankshaft 17 attached to a rotation angle (rotation angle) of the crankshaft 17 capture. A water temperature sensor 25 is also on the cylinder block 13 attached to a cooling water jacket WJ to detect the temperature of cooling water in the cooling water jacket WJ of the diesel engine. The fuel injector 16 , the crank angle sensor 24 , the water temperature sensor 25 and the GDU 30 are with an ECU (serving as regeneration activating means) 40 connected.

The ECU 40 comprises an electronic control unit composed mainly of a known microcomputer equipped with a CPU, memory and input / output interface and so on. The memories store a variety of programs and parameters to allow the CPU to execute the programs stored in the memories, thereby removing various parts of the diesel engine 10 to be controlled. The control of the operation of the fuel injection valves 16 controls the ECU 40 Fuel injection modes such as fuel injection amounts, fuel injection timings (fuel injection timings), and the number of stages for multi-stages injections to be performed in multiple injections for each combustion cycle. Furthermore, the ECU controls 40 the operation of the glow plug 20 in a manner which is described in detail later in the description.

The following is a structure of the GDU 30 with reference to 2 described. In 2 a solid line indicates the GDU 30 , and indicate single-component lines (dashed, broken lines) other component parts. The GDU 30 has a control IC 31 (Power-on control device) and a power element TR (switching element). Concrete examples of the power element TR may include a power transistor such as a power MOSFET and an insulated gate bipolar transistor IGBT, and so on. The ECU (command control unit) 40 outputs a command signal CS1 corresponding to the control IC 31 is supplied. This command signal 1 is a duty signal for performing duty control of the glow plug 20 , The control IC 31 reinforces that from the ECU 40 supplied command signal for generating a switch-on signal. The power element TR opens or closes an electric power supply path between the battery 21 and the glow plug 20 in response to that from the control IC 31 supplied turn-on signal, whereby a turn-on state of the glow plug 20 is controlled.

Although according to the present embodiment, the glow plugs 20 each attached to the cylinder and the GDU 30 the power elements TR, each for the glow plugs 20 attached as described above is merely a single glow plug 20 and a single power element TR in 2 shown, with other glow plugs 20 and the other power elements TR have been omitted for ease of illustration.

Below is a hardware structure of the GDU 30 with reference to 3 described. The power elements TR and the control IC 31 are on a metal plate 33 attached to a surface thereof and are electrically connected to each other by wire-bonding. Among the terminals T1 to T5, the terminal T2 is electrically connected to the metal plate 33 connected by wire bonding. In addition, the terminal T3 is electrically connected to the power element TR by wire bonding. Furthermore, the battery 21 connected to terminal T2 and is the glow plug 20 connected to the terminal T3. Accordingly, out of the battery 21 supplied electric power the glow plugs 20 over the metal plate 33 , the power element TR and the terminal T3 respectively. In addition, the terminal T5 serves to supply electric power from the battery 24 to the control IC 31 ,

Furthermore, the metal plate is used 33 also to serve as a heat radiating plate for radiating heat contained in the power elements TR and the control IC 31 is developed. On the other surface of the metal plate 33 For example, a heat sink (heat radiating device) (not shown) may be attached.

The terminals T1 and T4 are electrically connected to the control IC by wire bonding. The from the ECU 40 supplied command signals are via the terminals T1 in the control IC 31 which generates a DIAG (diagnostic) signal that the ECU 40 is supplied via the terminal T4.

Furthermore, the thermosensors (temperature sensing elements) 32 attached to chips of the power elements TR for detecting temperatures of the power elements TR. Specific examples of the thermal sensors 32 may include thermal diodes and thermistors, etc. The thermosensors 32 are electrical with the control IC 31 connected by wire bonding.

The power elements TR, the control IC 31 , the metal plate 33 , the thermal sensors 32 and parts of the terminals T1 to T7 are bonded to each other through a resin shield. At the in 3 The structure shown is the resin shield 34 Shown in a cross section and indicated by a hatched area. The resin shield 34 prevents various wire bonded component parts from shorting due to adhesion of moisture and foreign materials.

With such a construction as described above, the ECU outputs 40 during a cold start of the diesel engine 10 the command signal to the glow plug 20 to turn it off. Below is the switch-on phase of the glow plug 20 to support the initial ignitability during a cold start referred to as "cold start assist turning on". Furthermore, another switch-on of the glow plug 20 performed in the DPF regeneration, hereinafter referred to as "DPF regeneration turn-on". In addition, it is assumed that the DPF regeneration turn-on is performed for a given time interval of, for example, approximately 30 minutes.

The DPF device 19a must be subjected to a PM combustion regeneration operation when the trapped particulates (PM) exceed a given level. at Injecting fuel into the diesel engine 10 a main injection is carried out, and subsequently a post injection is performed to the diesel engine 10 to allow exhaust gases, the temperature of which has been forcedly raised to a value of, for example, 500 ° C to 605 ° C, to be forced to forcibly burn the trapped particulate matter (PM) for removal. In addition, the term "main injection and post-injection" refers to fuel injections for injecting fuel into the diesel engine multiple times 10 for each combustion cycle, the main injection being fuel for rotatably driving the output shaft 17 to inject, and the post-injection is carried out after the main injection to contribute to an increase of the exhaust gases.

With the according to the present embodiment executed regenerative operation will, in addition to the execution Such a post-injection, the main injection with a increased fuel volume to thereby increase the temperature of the exhaust gases. However, leads trying to just the volume of fuel in the main injection to increase, to increase the engine speed (NE), which causes a driver to feel uncomfortable experienced. In particular, performs during a mode at low speed such as an idle drive mode, the speed increase to a significant increase in the unpleasant feeling.

In the glow plug control apparatus according to the present embodiment, particular attention is paid to an effect in which the battery 21 is charged by the electric power that is generated when a drive source in the form of the output shaft 17 is used, and further attention is paid to an effect in which the increase of an electric load of the battery 21 allows the main injection to be performed with increased fuel volume without causing the speed increase. That is, during the regenerative operation in which the main injection is performed with an increased fuel volume, the drive of the glow plug 20 causes the electrical load of the battery 21 elevated. This allows the main injection to be performed with the increased fuel volume while minimizing the speed increase. During the execution of such regenerative operation, it corresponds to the ECU 40 forming microcomputer for controllably switching on the glow plug 20 to the electrical load of the battery 21 to increase, a "regeneration activating device".

However, during such regenerative operation, the combustion chamber reaches 15 a high temperature. Therefore, there are concerns that the attempt to turn on the glow plug 20 leads to the development of heat or heat in the power elements TR, so that the temperature of the power elements TR exceeds heat-resistant temperatures.

According to the present embodiment, in order to avoid the occurrence of damage to the power element TR due to the evolution of heat therein, a determination routine as described in US Pat 4 to make a request as to whether the power element TR reaches a high-temperature anomaly state.

The determination routine according to 4 is an operation repeated with the microcomputer of the control IC 31 or the GDU 30 in a given cycle (of, for example, a calculation processing cycle of the control IC 31 ) is performed.

In the first step S10, the operation is started in response to a power element TR from the control IC 31 supplied power-on signal, whereby a request is made as to whether the power element TR remains in an on state. If the answer to this inquiry is YES (S10: YES), the routine proceeds to step S20, which corresponds to a determination means in which the operation in response to an out of the thermal sensor 32 in the control IC 31 input temperature detection signal is executed, whereby a request is made as to whether a temperature of the power element TR exceeds a predetermined threshold (a given temperature) which is at a high temperature.

If the answer to this inquiry is YES (S20: YES), the routine goes to step S30 which corresponds to a determination means in which a request is made as to whether the temperature of the power element TR is continuously given the threshold value for a time corresponding to a predetermined one Time interval (filter time) exceeds tfil and longer. If the answer to this inquiry is YES (S30: YES), it is determined that the power element TR reaches the high-temperature anomaly state, and the routine proceeds to step S40. In step S40, which corresponds to a turn-on limiting means, the turn-on signal is forcibly switched to a turn-off state to cut off the supply of electric power to the power element TR. In addition, it should be noted that the determining operations in steps S10, S20 and S30 are executed for the plurality of power elements TR, respectively. In step S40, the process of interrupting the supply of electric power to only the power element becomes ment TR of a relevant channel.

In the subsequent step S50, the control IC performs 31 the ECU 40 a DIAG signal representing that the turn-on signal has been turned off in contrast to the command signal. In the subsequent step S60, a request is made as to whether the temperature of the power element TR falls below the threshold value. If the answer to this request is YES (S60: YES), the routine proceeds to step S70, at which the operation is executed to resume the on state of the power element TR of the relevant channel which has been forcibly turned off. In the subsequent step S80, the control IC performs 31 the ECU 40 another DIAG signal representing the resumed power-up state.

• (1) Da der Thermosensor 32 direkt die Temperatur (Elementtemperatur) des Leistungselements TR erfasst, kann eine genaue Elementtemperatur in einer zuverlässigeren Weise beschafft werden, als die, die mit der Steuerung gemäß dem Stand der Technik erzielt wird, bei der die Elementtemperatur auf der Grundlage eines durch das Leistungselement TR fließenden Stromwerts geschätzt wird. Somit besteht kein Bedarf, dass das Leistungselement eine übermäßig erhöhte Hitze- bzw. Wärmewiderstandsfähigkeit aufweist. Dies ermöglicht eine Verringerung in dem Wärmewiderstandsverhalten des Leistungselements, bzw. es kann ausreichend sein, dass eine Wärmeabstrahleinrichtung wie ein Kühlkörper oder dergleichen eine verringerte Strahlungsfähigkeit aufweist.

With such a structure according to the present embodiment, the glow plug control device has various advantages as listed below.

• (1) Since the thermal sensor 32 directly detects the temperature (element temperature) of the power element TR, an accurate element temperature can be obtained in a more reliable manner than that achieved with the control according to the prior art, in which the element temperature based on a flowing through the power element TR Current value is estimated. Thus, there is no need for the power element to have excessively high heat resistance. This enables a reduction in the thermal resistance performance of the power element, or it may be sufficient that a heat radiating device such as a heat sink or the like has a reduced radiating ability.

• (2) Unter dem Umstand, in dem ein sich erhöhender Einschaltstrom durch die Glühkerze 20 fließt, führt ein Versuch zur Durchführung der Steuerung gemäß dem Stand der Technik, bei der die Elementtemperaturen auf der Grundlage des durch das Leistungselement TR fließenden Stromwerts angenommen wird, ein Bedarf zum Vorsehen eines hohen Stromschwellwerts, um zu verhindern, dass in Übereinstimmung mit dem Einschaltstrom Hochtemperaturanomalien bestimmt werden. Jedoch wird in einer Situation, in der ein Fehler (wie beispielsweise ein seltener elektrischer Kurzschluss oder dergleichen) in dem Leistungselement TR mit einem Strom auftritt, der auf einem Pegel fließt, der etwas niedriger als der Schwellwert ist, der elektrische Strom erfasst, ohne dass bestimmt wird, dass eine Hochtemperaturanomalie vorhanden ist. Somit besteht das Risiko, dass ein Fehler in dem Leistungselement TR aufgrund einer hohen Temperatur auftritt. Die Anordnung gemäß dem vorliegenden Ausführungsbeispiel kann sich mit einem derartigen Fehler des Leistungselements TR befassen, der aus dem seltenen Kurzschluss auftritt, indem die Elementtemperatur mit Verwendung des Thermosensors direkt erfasst wird. Daher kann selbst, falls der Fehler aufgrund des seltenen Kurzschlusses auftritt, die Hochtemperaturanomalie des Leistungselements TR genau unterschieden bzw. erkannt werden, um die Zufuhr der elektrischen Leistung zu dem Leistungselement TR zu unterbrechen.
• (3) Falls das Leistungselement TR den Schwellwert überschreitet, wird lediglich dann bestimmt, dass das Leistungselement TR den Hochtemperaturanomaliezustand erreicht, wenn die Zeit, während der die Temperatur des Leistungselements den Schwellwert überschreitet, kontinuierlich während des gegebenen Zeitintervalls tfil oder länger überschritten wird. Dies verhindert, dass eine fehlerhafte Bestimmung aufgrund eines Effekts auftritt, bei dem die Temperatur des Leistungselements TR in Reaktion auf eine Störung (Rauschen) den Schwellwert überschreitet.

In particular, according to the present embodiment, the glow plug 20 not only for the cold start, but also for the DPF regeneration mode switched on. Therefore, there is a concern that due to an electric current flowing through the power element TR having an ambient temperature that remains under an extremely high state, to cause the associated glow plug 20 is turned on, there is a tendency that high-temperature anomalies occur in the power element TR. As described above, according to the present embodiment, it is possible to obtain the advantage with a reduction in required heat resistance performance and radiation performance.

• (2) Under the circumstance in which an increasing inrush current through the glow plug 20 flows, an attempt to perform the control according to the prior art, in which the element temperatures is assumed based on the current value flowing through the power element TR, a need for providing a high current threshold, to prevent, in accordance with the inrush current High temperature anomalies are determined. However, in a situation where a fault (such as a rare electric short-circuit or the like) occurs in the power element TR with a current flowing at a level slightly lower than the threshold, the electric current is detected without it is determined that a high-temperature anomaly is present. Thus, there is a risk that an error occurs in the power element TR due to a high temperature. The arrangement according to the present embodiment may deal with such failure of the power element TR arising from the rare short circuit by directly detecting the element temperature using the thermal sensor. Therefore, even if the fault occurs due to the rare short circuit, the high-temperature anomaly of the power element TR can be accurately discriminated to interrupt the supply of the electric power to the power element TR.
• (3) If the power element TR exceeds the threshold, then it is determined that the power element TR reaches the high-temperature anomaly state only if the time during which the temperature of the power element exceeds the threshold is continuously exceeded during the given time interval tfil or longer. This prevents an erroneous determination from occurring due to an effect in which the temperature of the power element TR exceeds the threshold value in response to a disturbance (noise).

Second embodiment

A glow plug control device according to a second embodiment of the present invention will be described below with reference to FIG 5 described.

The glow plug control device according to the second embodiment is different from the glow plug control device according to the first embodiment with respect to various features described below. That is, with the glow plug control device according to the first embodiment, turning off the power-on interruption power-ON signal for interrupting the supply of electric power causes the size of the glow plug 20 supplied electrical power is limited when one is determined that a High temperature anomaly is present. In the glow plug control device according to the second embodiment, when it is determined that the high-temperature abnormality is present, the ECU 40 a control IC 31 supplied command signal for turning on the power element TR, which has a smaller duty ratio (command duty ratio) than a duty ratio (duty ratio) of the turn-on signal, which from the control IC 31 the power element TR is supplied. This allows the size of the glow plug 20 supplied electric power is reduced, thereby causing the magnitude of electric power to turn on the glow plug 20 per unit of time is limited within a given value.

More specifically, the determination operation routine becomes 4 in a sequence according to 5 changed. First, like the processes S10 to S30 in FIG 4 the operations are performed in a sequence to execute: a request is made as to whether the power element TR is in the on-state (step S10), a request is made as to whether the temperature of the power element TR exceeds the threshold (step S20 ), and a request is made as to whether a time during which the temperature of the power element TR exceeds the threshold has continuously elapsed during the predetermined given time interval tfil or more (step S30).

If it is determined that the time has elapsed during the given time interval tfil or longer (S30: YES), it is subsequently determined that the power element TR remains in the high-temperature anomaly state, whereupon the routine goes to step S50 by the control IC 31 a DIAG signal representing the determination of the high-temperature anomaly state, the ECU 40 supplies. In the subsequent step S61, which corresponds to a power-on limiting device, the control IC performs 31 the power element TR to a turn-on signal having a duty cycle (duty), which is less than a duty cycle based on the command signal reproducing basic duty cycle (see FIG. 6 (a) ) of the turn-on signal supplied to the power element TR of the relevant channel, which is determined to be involved in the high-temperature anomaly state. In addition, reference t10 in FIG 6 (a) and 6 (b) a time point at which it is determined that the power element TR remains in the high-temperature anomaly state.

In In the following step S62, a request is made as to whether the Temperature of the power element TR falls below the threshold. If the answer to this request is NO (S62: NO), the Operation is returned to step S61, in FIG the on-load ratio is further reduced. If the answer to this inquiry is YES (S62: YES), the routine goes to step S63, in which the turn-on duty cycle the turn-on signal, the power element TR of the relevant Channel is supplied as in the high-temperature anomaly state remaining determined is increased so that it is larger than the current power-on ratio is.

In the subsequent step S64, a request is made as to whether the temperature of the power element TR exceeds the threshold. If the answer to this inquiry is YES (S64: YES), the flow returns to step S61 where the duty ratio of the power element TR of the relevant channel determined to remain remaining in the high-temperature anomaly state is again decreased. In contrast, if the answer to this request is NO (S64: NO), a query is made in step S65 as to whether the duty ratio reduced in the previous step has been returned to the basic duty ratio of the command signal. If the answer to this question is YES (S65: YES), the control IC performs 31 the ECU 40 a DIAG signal representing a normal state in the absence of a high-temperature anomaly.

From the above description, it can be understood that also according to the present embodiment, which is arranged to reduce the duty ratio of the duty ratio supplied to the power element TR during the high-temperature anomaly state, the thermal sensor 32 directly detects the temperature of the power element TR, so that the second embodiment can have the same advantageous effects as those according to the first embodiment.

Third embodiment

A glow plug control device according to a third embodiment of the present invention will be described below with reference to FIG 7 to 10 described.

The glow plug control device according to the third embodiment is different from the glow plug control devices according to the first and second embodiments with respect to various features described below. That is, as it is in 7 is shown, the glow plug control device according to the third embodiment in addition to the glow plug 20 , which is assigned as a first electrical load, has second and third electrical loads that are established during the DPF regeneration mode to be turned on. Concrete example of the second and third electric vices 202 and 203 For example, an electric heater (for an intake air heater) for heating an intake airflow drawn into the combustion chamber, an electric heater (sheet heater) for heating a driver's seat may include an electric heater (windshield heater) attached to a rear window is attached, and an electric fan for cooling a radiator (radiator), etc. include.

Furthermore, an in 7 shown first control IC 31A same structure and function as those of 2 shown control IC 31 on. Second and third control ICs 302 and 303 respond to command signals CS2 and CS3 to generate actual turn-on signals TOS2 and TOS3 respectively supplied in second and third electrical loads.

8 (a) FIG. 12 shows a state variation in the duty ratio (command duty ratio) of one of an ECU 40A the first control IC 31A supplied command signal CS1. 8 (b) shows a representation of a DIAG signal DIAG that from the first control IC1 to the ECU 40A is output, and a series signal (sequence signal), which consists of four signal components corresponding to four glow plugs 20 is composed. In 8 (b) A bit # 0 indicates a start bit, and a bit # 9 indicates a stop bit. The DIAG signal DIAG has, in addition to the No. 0 start bit and No. 9 stop bit, high-temperature anomaly signals with respect to the four power elements TR in order immediately after the start bit No. 0. At the in 8 (b) In the example shown, bits Nos. 1 to 4 each assume high levels, on the basis of which it is found that all four power elements TR remain in high-temperature anomaly states.

According to the various foregoing embodiments, although upon detection of the high-temperature anomaly state, the turn-on signal is modulated to have a reduced duty cycle or to be forcibly turned off in contrast to the turn-on signal, the command signal may be reduced in duty cycle or turned off. as it is in 8 (a) is shown. At the in 8 (a) In the example shown, bits Nos. 1 to 4 of the DIAG signal are respectively set at high levels, based on which the duty ratio of the succeeding command signal CS1 is reduced in the duty ratio.

9 (b) . 9 (e) and 9 (g) switch-on signals TOS1 to TOS3 da, consisting of the first to third control ICs 31 . 302 and 303 each to the first to third electrical loads 20 . 202 and 203 be issued.

9 (a) . 9 (d) and 9 (f) Command signals CS1 to CS3 are there from the ECU 40 to the first to third control ICs 31 . 302 and 303 be issued, and 9 (c) provides a DIAG signal with an anomaly signal.

In the glow plug control apparatus according to the present embodiment, as shown in FIG 9 (a) to 9 (g) is shown at a time t0, the execution of the DPF regeneration operation, and the command signals CS1 to CS3 of OFF states to ON states for turning on all of the first to third electrical loads 20 . 202 and 203 connected. Thereafter, if the high-temperature anomaly state of the power element TR increases with respect to the glow plug serving as the first electric load 20 is detected, at the time t10 an anomaly signal AS in the DIAG signal (see FIG. 9 (c) ) at.

Upon detection of the high-temperature anomaly state of the power element TR, the turn-on signal TOST for the relevant power element TR has a reduced turn-on duty cycle (FIG. 9 (b) ), wherein at the same time the command signals CS2 and CS3 each have increased amplitudes AM1. This enables the second and third turn-on signals TOS2 and TOS3 for the second and third electrical loads 202 and 203 increased duty cycles (duty cycles, duty) have DI. This compensates for the reduced duty cycle of the first turn-on signal TOST with respect to the first electrical load 20 , This ensures that an adequate amount of electrical loads is used to prevent a speed increase that occurs when the amount of fuel injected in the main injection during the DPF regeneration operation is increased. Subsequently, at the time t20 at which the DPF regeneration operation is terminated, the command signals CS1 to CS3 are switched to off states to all of the first to third electric loads 20 . 202 and 203 off.

In 9 (b) . 9 (d) . 9 (e) . 9 (f) and 9 (g) shown dashed lines represent the on states of the first to third electrical loads 20 . 202 and 203 in a situation where no high-temperature anomaly condition is detected.

Below is an in 10 Shown flowchart of a basic flow of a control routine for controlling the on states of the first to third electrical loads 20 . 202 and 203 described.

In the 10 shown control routine is repeated with the one in the ECU 40A Built-in microcomputer running for a given cycle.

First, in step S100, a request is made as to whether the diesel engine is in a period in which execution of the DPF regeneration operation is necessary. If the answer to this request is YES (S100: YES), the subsequent step S101 is the ECU 40A the first command signal CS1 (hereinafter referred to as "power-on command") to the first control IC 31 out.

In the subsequent step S105, a request is made as to whether the power element TR falls in the high-temperature anomaly state. In carrying out such a request, the ECU 40A be adapted to obtain a detected temperature signal from the thermal sensor 32 the control IC 31 is supplied, whereupon the microcomputer of the ECU 40A performs the operation based on such detected temperature signal to make a request as to whether the power element TR falls in the high-temperature anomaly state. According to another alternative, the first control IC 31 be configured to determine the presence of a Hochtemperaturanomalie based on such a detected temperature signal to prepare a DIAG signal, which in turn to the ECU 40A is sent. In this case, the microcomputer procures the ECU 40A a determination result regarding the presence of the high-temperature anomaly contained in the DIAG signal.

If it is determined that there is no high temperature abnormality (S105: NO), then in the subsequent step S110, the ECU sends 40A a normal turn-on command to the second control IC 302 to cause the second electrical load 202 is turned on at a predetermined ON duty ratio for normal operation. Further, in step S111, the ECU sends 40A another normal power-on command to the third control IC 303 to cause the third electrical load 203 is turned on at the predetermined ON duty ratio for normal operation.

The first control IC performs 31 in addition to the routine according to 10 in the 5 shown operating routine. Accordingly, during the occurrence of the high-temperature abnormality, execution of the process in step 61 according to FIG 5 to the consequence that the turn-on ratio of the glow plug 20 is made lower than the basic duty cycle based on the command signal. If it is determined in the current routine that the high-temperature abnormality is present in the power element TR (S105: YES), the first control IC acquires S120 31 a turn-on decrement with a reduced duty cycle compared to the basic duty cycle. For example, causing the first control IC 31 a DIAG signal with such power-on decrement to the ECU 40A sends, the ECU 40A a procurement of the decrement described above.

In the subsequent step S121, a turn-on increment for the second and third electrical loads 202 and 203 is calculated on the basis of the power-on decrement obtained in step S120. The turn-on increment is determined to compensate the turn-on decrement just enough. Assuming that with all glow plugs 20 For example, if the duty cycles have been set to zero, the turn-on increment may preferably be set at a range of 100 watts to 400 watts or in a range of 25 watts to 400 watts.

In the subsequent step 130, the ECU sends 40A an incremented turn-on command (incrementation turn-on command) to the second control IC 302 to the second electrical load 202 with a turn-on duty ratio that is increased from a normal duty cycle rate for the normal operating state by the turn-on increment. In step S131, the ECU sends 40 another incremented power-on command to the third control IC 303 to turn on the third electrical load 203 with a duty cycle ratio increased from the normal duty cycle rate for the normal operating state by the turn-on increment.

In the subsequent step S170, a request is made as to whether the end time has come when the DPF regeneration operation has ended to complete the ON operation for the DPF regeneration operation. If it is determined that the end time exists to terminate the switch-on operation for the DPF regeneration operation (S170: YES), in the subsequent step S180, turn-on end commands to the first to third control ICs 31 . 302 and 303 sent to the on states of the first to third electrical loads 20 . 202 and 203 to interrupt. On the contrary, if it is determined that there is no end time for completing the power-on operation for the DPF regeneration operation (S170: NO) or if it is determined in step S100 that the DPF regeneration is not required at this time (S100: NO). , the flow is returned to step S100.

From the foregoing description, it will be understood that present embodiments have the same advantageous effects as those of the other various embodiments described above. In addition, the glow plug 20 is turned on at a reduced duty ratio when the high-temperature abnormality occurs during the DPF regeneration operation, resulting in the ability of the occurrence of a by turning on the glow plug 20 in a high-temperature environment, thermal damage to the power element TR is avoided.

According to the present embodiment, further, under a circumstance in which the high-temperature abnormality occurs during the DPF regeneration operation, the glow plug 20 switched on with a reduced turn-on ratio. Thus, the turn-on increment of the other electrical loads 202 and 203 compensate the switch-on decrementing of the first electrical load. This allows for adequately suppressing the occurrence of a speed increase during execution of the DPF regeneration operation.

Fourth embodiment

A glow plug control device according to a fourth embodiment of the present invention will be described below with reference to FIG 11 and 12 described.

In the glow plug control device according to the third embodiment, when the high-temperature abnormality occurs during the DPF regeneration operation, the glow plug becomes 20 switched on with the reduced turn-on ratio. To compensate for such turn-on decrement, the electrical loads become 202 and 203 switched on with increased power-up ratio. In this case, the turn-on duty ratio becomes for the plurality of electrical loads 202 and 203 incremented at the same time.

In contrast, in the glow plug control device according to the present embodiment, the turn-on increments of the second and third electric loads 202 and 203 initiated alternately.

Such a feature will be described in more detail below with reference to FIG 11 described. First, at t0, at which the operation of the DPF regeneration operation begins, the command signals are switched from the turn-off states to the turn-on states to all of the electrical loads 20 . 202 and 203 turn. If thereafter, the high-temperature anomaly state of the power element TR or the glow plugs 20 , which serves as the first electrical load detected at the time t10, an anomaly signal in the DIAG signal rises (see FIG. 11 (c) ).

Upon detection of the high-temperature anomaly, the on-duty ratio of the relevant power element TR is reduced (see FIG. 11 (b) ) and simultaneously becomes the command duty ratio for the second electrical load 202 increases to compensate for the reduction in the duty cycle of the relevant power element TR. Subsequently, at t11, the command duty ratio for the second electric load 202 returned to a normal value while the command duty ratio for the third electrical load 203 is increased. This makes it possible to ensure an adequate magnitude of the electric load for suppressing the speed increase caused by performing the main injection with the increased fuel volume during the DPF regeneration operation. Subsequently, at the time t20 at which the DPF regeneration operation is terminated, all the command signals are switched to off states to all of the electrical loads 20 . 202 and 203 off.

Below is a control routine for controlling the on states of the electrical loads 20 . 202 and 203 in more detail and with reference to an in 12 shown flowchart described.

The one in the ECU 40A contained microcomputer repeatedly performs the control routine according to 12 for a given cycle.

First, the same operations in steps S100 to S121 as those in FIG 10 executed. That is, if it is determined that DPF regeneration is not required (S100: YES), the ECU sends 40A the turn-on command to the first control IC 31 to the glow plug 20 to turn on (S101). If it is determined that there is no high-temperature anomaly condition (S105: NO), the ECU sends 40A the normal power on commands to the second and third control ICs 302 and 303 (S110 and S111). On the other hand, if it is determined that the high-temperature anomaly condition exists (S105: YES), the ECU acquires 40A Information regarding switch-on decrementing for the glow plug 20 (S120). Then the ECU calculates 40A the turn-on increments for the second and third electrical loads 202 and 203 based on the obtained power-on decrement (S121).

In the subsequent step S125, a request is made as to whether the second control IC 302 in on-load ratio rates is determined as a period for increasing the Einschalttastverhältnisrate for the second electrical load. If it is determined that the second control IC 302 is in a switch-on rate incrementing period (S125: YES), in the subsequent step S130, the ECU 40A a duty ratio rate incrementing command to the second control IC 302 off to the second electrical load 202 with an incremented on-duty ratio higher than the turn-on duty ratio for normal operation by the turn-on increment. On the other hand, if it is determined that the second control IC 302 is not in the ON duty ratio increment period (S125: NO), in the subsequent step S131, the ECU 40A another duty ratio rate incrementing command to the third control IC 303 off to the third electrical load 203 with a turn-on duty ratio greater than the turn-on duty cycle for normal operation by the turn-on increment.

In the subsequent step S170, a request is made as to whether the timing has come at which the DPF regeneration operation is completed, and the ON operation for the DPF regeneration operation is finished. If it is determined that the timing for ending the switch-on operation for the DPF regeneration operation has come (S170: YES), the ECU sends 40A in the subsequent step S180, the power-on stop command to the control IC 31 . 302 and 303 to the on states of the electrical loads 20 . 202 and 203 to interrupt. Conversely, if it is determined that the timing for ending the power-on operation for the DPF regeneration operation has not come (S170: NO) or if it is determined in step S100 that this is not the time for the power-on operation for the DPF regeneration operation ( S100: NO), the flow is returned to the process in S100.

In the glow plug control apparatus according to the above-described embodiment, if the high-temperature abnormality occurs during the DPF regeneration substation, the turn-on duty ratio of the glow plug becomes 20 reduced. This prevents the occurrence of thermal damage to the power element TR by turning on the glow plug 20 is caused in the high temperature environment. Further, according to the present embodiment, the on-duty ratio rate of the power element TR is reduced when the high-temperature abnormality is present during the DPF regeneration operation. In such a case, turn-on decrementing is done by alternately increasing the turn-on duty ratio rates of the other electrical loads 202 and 203 compensates, which adequately suppresses the speed increase caused during the DPF regeneration operation.

Fifth embodiment

A glow plug control device according to a fifth embodiment of the present invention will be described below with reference to FIG 13 and 14 described.

In the glow plug control devices according to the second to fourth embodiments, when the high-temperature anomaly occurs during the DPF regeneration operation, the on-load duty ratio of the glow plug becomes 20 decreases and becomes the Einschaltdekrementierung the glow plug by increasing the Einschalttastverhältnisraten the electric load 202 and 203 compensated.

In contrast, according to the present embodiment, the ECU 40A configured to operate upon detection of a high temperature anomaly (at time t10) such that, once the execution of the DPF regeneration operation is interrupted, all electrical loads 20 . 202 and 203 are turned off (at the time t12).

13 (b) . 13 (e) and 13 (g) switch-on signals TOS1B to TOS3B da, consisting of the first to third control ICs 31 . 302 and 303 each of the first to third electrical loads 20 . 202 and 203 be supplied.

13 (a) . 13 (d) and 13 (f) Command signals CS1B to CS3B are provided to the first to third control ICs 31 . 302 and 303 from the ECU 40A be supplied, and 13 (c) shows a DIAG signal with an anomaly signal.

As it is in 13 (b) When a high temperature anomaly is detected at t10, a DIAG signal has an anomaly signal ASB as shown in FIG 13 (c) is shown. At this point, the ECU sends 40A a command signal CS2B to the second control IC 302 (Comp. 7 ), which in turn sends a signal TOS2B to the second electrical loads 202 supplies. At the same time the ECU sends 40A a command signal CS3B to the third control IC 303 which in turn provides a turn-on signal TOS3B to the third electrical load 203 supplies. The second and third turn-off signals TOS2B and TOS3B have falling edges at time t12, therefore all of the electrical loads 20 . 202 and 203 turned off.

Below is a control routine for controlling the on states of the electric weigh 20 . 202 and 203 in more detail and with reference to an in 14 shown flowchart described.

The one in the ECU 40A included microcomputer leads the in 14 shown control routine for a given cycle.

First, in steps S100 to S121, a request is made as to whether there is currently a period or period for turning on the DPF regeneration operation. If it is determined that the time for turning on the DPF regeneration operation has come (S100: YES), the ECU sends 40A in subsequent steps S102, command signals (turn-on commands) to the first to third control ICs 31 . 302 and 303 each to turn on all electrical loads 20 . 202 and 203 ,

If it is determined in the subsequent step S105 that there is no high-temperature anomaly condition (S105: NO), the operation of step S102 is continuously executed to continue transmitting the power-on commands until it is determined in the subsequent S170 that a Switch-on completion time to complete the DPF regeneration operation. Upon determination that the power-on end point has come to end the DPF regeneration operation (S170: YES), in the following step S180, the ECU sends 40A the power-on command to the control ICs 31 . 302 and 303 for interrupting the switch-on states of all electrical loads 20 . 202 and 203 ,

On the other hand, if it is determined that no high-temperature abnormality occurs during the DPF regeneration operation (S105: YES), in the subsequent step S140, the ECU sends 40A Command signals (power-on commands) to the control ICs 31 . 302 and 303 to interrupt the switch-on states of all electrical loads 20 . 202 and 203 ,

In the glow plug control apparatus according to the above-described present embodiment, when the high-temperature abnormality occurs during the DPF regeneration operation, the on-state of the glow plug becomes 20 interrupted. This prevents the occurrence of one by turning on the glow plug 20 under the high temperature environment caused thermal damage to the power element TR. Also, according to the present embodiment, when the high-temperature abnormality occurs during the DPF regeneration operation, execution of the DPF regeneration operation is once interrupted. This enables the temperature (element temperature) of the power element TR to be further decreased immediately than is attained when the DPF regeneration operation is continuously decreasing the on-duty ratio or interrupting the on-state of the glow plug 20 is achieved.

Sixth embodiment

A glow plug control device according to a sixth embodiment of the present invention will be described below with reference to FIG 13 and 14 described.

In the glow plug control devices according to the second to fourth embodiments, when the high-temperature anomaly occurs during the DPF regeneration operation, the on-load duty ratio of the glow plug becomes 20 decreases and becomes the turn-on decrement of the glow plug 20 by increasing the duty cycles of the electrical loads 202 and 203 compensated.

According to the present embodiment according to 15 on the other hand is the ECU 40A set up in such a way, all of the electrical loads 20 . 202 and 203 for a longer period of time (time period) between times t0 and t21 than those in which the electrical loads 20 . 202 and 203 be turned on if no high-temperature anomaly is detected.

15 (b) . 15 (e) and 15 (g) switch-on signals TOS1C to TOS3C da from the first to third control ICs 31 . 302 and 303 each of the first to third loads 20 . 202 and 203 be supplied.

15 (a) . 15 (d) and 15 (f) Command signals CS1C to CS3C are provided by the ECU 40A the first to third control ICs 31 . 302 and 303 be supplied, and 15 (c) shows a DIAG signal with an anomaly signal ASC.

As it is in 15 (b) 4, when a high temperature anomaly is detected at t10, a DIAG signal includes an ascending edge ASC signal having a rising edge and a falling edge respectively occurring at t10 and t21. Upon receipt of the DIAG signal, the first control IC transmits 31A a turn-on signal TOS1C for turning on the first electric load 20 (Comp. 7 ) with a reduced duty cycle rate during the period (period) t0 and t21, as shown in FIG 15 (c) is shown. At this point, the ECU sends 40A a command signal CS2C to the second control IC 302 (Comp. 7 ), which in turn is a signal TOS2C of the second electrical load 202 supplies. At the same time the ECU sends 40A a command signal CS3C to the third control IC 303 that again by a turn-on signal TOS3C to the third electrical load 203 supplies. The second and third turn-off signals TOS2B and TOS3B have falling edges at time t21, therefore all of the electrical loads 20 . 202 and 203 remain continuously on for an extra time interval, unlike a case where no high temperature anomaly is detected.

Below is a control routine for controlling the on states of the electrical loads 20 . 202 and 203 referring to a in 16 shown flowchart described.

The one in the ECU 40 contained microcomputer repeatedly performs the control routine according to 16 for a given cycle.

First, in step S100, a request is made as to whether or not there is a period (period) for turning on the DPF regeneration operation. If it is determined that the time for turning on the DPF regeneration operation is present (S100: YES), in the subsequent step S102, the ECU sends 40A Command signals (turn-on commands) to the first to third control ICs 31 . 302 and 303 each for switching on one of the electrical loads 20 . 202 and 203 ,

If it is determined in the subsequent step S105 that there is no high-temperature anomaly state (S105: NO), the operation in step S102 is continuously performed to continue transmitting the turn-on commands until it is determined in the subsequent step S170 that the Switch-on completion time to complete the DPF regeneration operation. Upon determination that the power-on end point for completing the DPF regeneration operation is present (S170: YES), in the subsequent step S180, the ECU sends 40A the power-on commands to the control ICs 31 . 302 and 303 for interrupting the switch-on states of all electrical loads 20 . 202 and 203 ,

On the contrary, if it is determined that the high temperature abnormality occurs (S105: YES), then in the subsequent step S120 acquires the ECU 40A Information regarding the turn-on decrement of the glow plug 20 in the same manner as in step S120 in FIG 10 , In the subsequent step S150, the ECU calculates 40A a Einschaltextrazeit for the second and third electrical loads 202 and 203 on the basis of information regarding the power-on decrement obtained in step S120. Thus, the ECU performs 40A the operation for updating the timing at which the DPF regeneration operation is ended and the ON operation for the DPF regeneration operation is completed, to a new time that is delayed by the calculated extra time by. That is, the power-on end point used for the determination made in S170 is delayed. In addition, when the DPF regeneration operation time is delayed, the temperature of the exhaust gases may preferably be carried out by performing a main injection with a reduced fuel volume to reduce the degree of temperature rise to facilitate a temperature drop of the power element TR.

In the glow plug control apparatus according to the present embodiment described above, the on-duty ratio is decreased when the high-temperature abnormality is present during the DPF regeneration operation. This prevents the occurrence of thermal damage to the power element TR when the glow plug is turned on 20 caused under the high temperature environment. In addition, the extension of the DPF regeneration operating time depending on the turn-on decrementing of the glow plug 20 in connection with the extension of the turn-on periods of the other electrical loads 202 and 203 adequately achieving the suppression of the speed increase during the DPF regeneration operation.

Seventh embodiment

Hereinafter, a glow plug control device according to a seventh embodiment of the present invention with reference to 17 and 18 described.

In the glow plug control devices according to the second to sixth embodiments, all electrical loads 20 . 202 and 203 during the DPF regeneration operation is turned on, whereby the speed increase is suppressed. In contrast, according to the in 17 1, during the DPF regeneration operation, only the glow plug is shown 20 switched on, the other electrical loads 202 and 203 remain off, and when the high-temperature anomaly is detected, at time t10, the other electrical loads become 202 and 203 switched on.

17 (b) . 17 (e) and 17 (g) Turn ON signals TOS1D to TOS3D, each of the first to third control ICs 31 . 302 and 303 to the first to third electrical loads 20 . 202 and 203 be issued.

17 (a) . 17 (d) and 17 (f) Command signals represent CS1D to CS3D coming from the ECU 40A to the first to third control ICs 31 . 302 and 303 be issued and shows 17 (c) a DIAG signal with an anomaly signal ASD.

As it is in 17 (b) 12, when a high-temperature anomaly is detected at t10, a DIAG signal has the anomaly signal ASD at which a rising edge and a falling edge occur at t10 and t20, respectively. Upon receipt of the DIAG signal, the first control IC transmits 31A the turn-on signal TOS1D for turning on the first electric load 20 (Comp. 7 ) at a reduced duty cycle rate during the period t0 to t20, as shown in FIG 17 (c) is shown. At this point, the ECU sends 40A a command signal CS2D to the second control IC 302 (Comp. 7 ), which in turn is a turn-on signal TOS2D of the second electrical load 203 supplies. At the same time the ECU sends 40A a command signal CS3D to the third control IC 303 , which in turn is a turn-on signal TOS3D of the third electrical load 203 supplies. The second and third turn-off signals TOS2D and TOS3D have falling edges at time t20, therefore, only the glow plug 20 is switched on, whereas the other electrical loads 202 and 203 turned off. In addition, when the high-temperature anomaly is detected at t10, the other electrical loads become 202 and 203 switched on. Below is a control routine for controlling the on states of the electrical loads 20 . 202 and 203 further referring to 18 shown flowchart described.

The one in the ECU 40 contained microcomputer repeatedly performs the control routine according to 18 for a given cycle.

First, in steps S100 to S105, S120 and S121, the same operations as those in FIG 10 executed. That is, if it is determined that there is a turn-on period for the DPF regeneration operation (S100: YES), the ECU 40A the turn-on command to the first control IC 31 to turn on the glow plug 20 sent (S101). If it is determined that there is a high temperature abnormality (S105: YES), the ECU obtains 40A the switch-on decrementing of the glow plug 20 (S120) and calculates the duty ratio rates of the second and third electric loads 202 and 203 based on the obtained power-on decrement (S121).

These turn-on duty ratios are determined to have values indicative of the turn-on decrement of the glow plug 20 compensate exactly (without excess or deficit).

First, in step S160, the ECU sends 40A a power-on command to the second control IC 302 for switching on the second electrical load 202 with a duty ratio rate calculated in step S121. In addition, in the subsequent step S161, the ECU sends 40A another turn-on command to the third control IC 303 to turn on the third electrical load 203 with a duty cycle rate calculated in S121.

In the subsequent step S170, an inquiry is made as to whether there is an end timing for terminating the DPF regeneration operation and for the power-on operation for completing the DPF regeneration operation. If it is determined that the end timing for completing the DPF regeneration operation is present (S170: YES), in the succeeding step S180, the ECU sends 40A Turn on commands to the control ICs 31 . 302 and 303 for the termination of the switch-on states of all electrical loads 20 . 202 and 203 , However, if it is determined that there is no end timing for the DPF regeneration operation (S170: NO) or if it is determined that no DPF regeneration is required (S100: NO), the flow returns to step S100.

On the other hand, if it is determined in step S105 that there is no high-temperature abnormality (S100: NO), the flow advances to step S170, at which no turn-on commands to the second and third control ICs 302 and 303 are sent as the processes in step S160 and S161. That is, when there is no high-temperature anomaly condition, even during the DPF regeneration operation-on period, there are no turn-on operations of the second and third electric loads 202 and 203 be executed.

In the above-described glow plug control apparatus according to the present embodiment, the on-load duty ratio of the glow plug is reduced when the high-temperature abnormality is present during the DPF regeneration operation. This prevents the occurrence of thermal damage to the power element TR when the glow plug is turned on 20 caused under the high temperature environment. In addition, according to the present embodiment, in the presence of a high-temperature anomaly during the DPF regeneration operation, the on-load duty ratio of the glow plug becomes 20 reduced. In this case, the turn-on decrement of the glow plug 20 by turning on the operation of the second and third electrical loads 202 and 203 compensated. This adequately suppresses the speed increase caused by the DPF regeneration operation. Further, according to the present embodiment, when there is no high-temperature anomaly condition, there are no turn-on operations of the second and third electric loads 202 and 203 even during the DPF regeneration operation switching period executed. This prevents the second and third electrical loads 202 and 203 be actuated at a time not intended by a vehicle occupant, thereby preventing the vehicle driver from feeling uncomfortable.

Eighth embodiment

A glow plug control device according to an eighth embodiment of the present invention will be described below with reference to FIG 19 (a) to 19 (d) described.

In the glow plug control apparatus of the various embodiments described above, when the glow plug is turned on 20 during the DPF regeneration operation, from the control IC 31 turn-on signal outputted to the power element TR has a duty ratio which rapidly increases stepwise at the time t0, as shown in FIG 11 (b) is shown. Increasing the duty cycle in such a manner (see FIG. 11 (b) ) leads to the appearance of an inrush current passing through the glow plug 20 flows, with a consequent increase in electrical power consumption for a few seconds (cf. 19 (a) ). However, when the glow plug is switched on, it increases 20 during the execution of the DPF regeneration operation, the electric power consumption due to the occurrence of the inrush current occurs, and a variation in the magnitude of the electric load takes place. This results in the occurrence of a fluctuation in the rotational speed during a phase of suppressing the speed increase during the execution of the DPF regeneration operation.

In the glow plug control apparatus according to the present embodiment, on the other hand, a duty ratio of a power-on signal supplied to the power element TR is gradually increased (see FIG. 19 (d) ) when turning on the glow plug 20 when starting the DPF regeneration operation. Thus, the glow plug points 20 no fluctuation in the electric power consumption due to the inrush current, and the electric power consumption is maintained at a fixed level between a power-on start time t0 and a power-on end time t20 (see FIG. 19 (c) ). Furthermore, according to an alternative, the ECU 40A such that as the duty ratio is gradually increased in the above-described manner, the duty ratio of the turn-on signal applied to the power element TR can be gradually increased in a predetermined pattern to enable the glow plug 20 has a fixed electrical power consumption. In such an alternative, the duty cycle of the turn-on signal applied to the power element TR may be gradually increased with a given time constant.

According to the present embodiment described above, when the glow plug is turned on 20 During the execution of the DPF regeneration operation, it is possible to prevent the occurrence of a fluctuation in the magnitude of the electric load, thereby coping with the problem of the fluctuation in the rotational speed.

Ninth embodiment

A glow plug according to a ninth embodiment of the present invention will be described below with reference to FIG 20 described.

According to the first embodiment described above, the one in the ECU 40 microcomputer arranged to form the "regeneration activating means" for controllably switching on the glow plug to cause the electric load of the battery 21 increases. That is, the microcomputer of the ECU 40 commands to turn on the glow plug 20 during the execution of the DPF regeneration operation.

According to the in 20 On the other hand, the present embodiment shown has a GDU 30A a microcomputer 35A which has the "regeneration activation device". That is, the microcomputer 35A the GDU 30A commands to turn on the glow plug 20 during the execution of the DPF regeneration operation.

According to the first embodiment, furthermore, the control IC 21 that the operation in S40 according to 4 is executed, the "Einschaltbegrenzungseinrichtung" for performing the control to interrupt the on state of the power element TR in response to the from the thermal sensor 32 perform supplied temperature detection signal. Information regarding such a limiting operation is given to the ECU 40 supplied as the DIAG signal.

In contrast, in the structure according to the present embodiment according to 20 a temperature detection signal T1 coming from the thermal sensor 32 a control IC 31A the GDU 30A is supplied to the microcomputer 35A the GDU 30A supplied as a DIAGA signal. Upon receiving such a DIAG signal DIAGA, the microcomputer outputs 35A the GDU 30A a command signal CSA for interrupting the on state of the power element TR in response to the acquired temperature detection signal T1.

In summary, the operations performed by the microcomputer of the ECU according to the first embodiment 40 be executed, according to the present embodiment by the microcomputer 35A the GDU 30A executed.

Further embodiments

The various embodiments described above can be implemented in different modified forms be as listed below. Furthermore is the present invention is not limited to the contents of the descriptions limited to the embodiments described above, and the different structures according to the various embodiments, as above have been described, can be varied in any Combinations are implemented.

Although the various embodiments have been described above with reference to the structures in which the thermal sensor 32 is attached to the power element TR, the present invention is not limited to such structures, and may be the thermal sensor 32 for example, on the control IC 31 or the metal plate 33 be attached. Furthermore, in the case where the thermal sensor 32 on the control IC 31 is attached, the wire bonding for connecting the control IC 31 and the thermosensor 32 eliminated each other. Furthermore, in another case where the thermal sensors 32 attached to the power elements TR, a request is made as to whether the high temperature anomaly is present at each of the plurality of power elements TR.

If the high-temperature anomaly at a time of the beginning of the DPF regeneration operation or during the execution of the DPF regeneration operation can be detected, the execution of the DPF regeneration operation once interrupted, and after a drop in temperature of the power element TR upon elapse of a given time interval occurs, the DPF regeneration operation can be performed again become.

For switching on the electrical loads 20 . 202 and 203 During the DPF regeneration operation, the on-load duty ratios of the electrical loads 20 . 202 and 203 be set up such that they are lower than those of the electrical loads 20 . 203 and 203 which are used for another application except the DPF regeneration mode. This achieves a reduction in noise (noise, noise) caused by the operation of electrical loads 20 . 202 and 203 caused, for example, by electric fans during the DPF regeneration operation, whereby a reduction in uncomfortable feeling is achieved in a vehicle occupant.

Although the first embodiment according to 1 has been described as being that of a DPF unit 19a As a cleaning device, the cleaning device may be in addition to the DPF unit 19a an NOx catalyst for purifying NOx components in exhaust gases or an oxidizing catalyst for purifying HC and CO in exhaust gases, etc. Since these catalysts operate under conditions that are activated at high temperatures, the electrical loads become 20 . 202 and 203 is turned on as the speed-up suppressing means when the amount of fuel injected in the main injection is increased not for the regenerative operation but for an activation treatment.

According to the various embodiments described above, in support of an initial ignitability when starting the diesel engine 10 the glow plug 20 switched on (as a start glow), in addition to the glow plug 20 is turned on during execution of the DPF regeneration operation. Alternatively, not just the glow plug 20 during the execution of the DPF regeneration operation is turned on, but afterglow may be performed as described below. That is, when applied to a diesel engine having a low compression ratio or when causing the diesel engine 10 operated at high altitude with thin air, even if the diesel engine 10 is started with the glow at engine start, an interruption of the operation of the glow plug 20 in a subsequent stage, the risk of the occurrence of a misfire in the combustion chamber. To avoid such a risk, after the start glow has been performed for a given time interval (of, for example, approximately 5 minutes), the glow plug may be fired 20 preferably (as an afterglow) for a given post-start period (of, for example, approximately 5-10 min.) to complete the combustion.

According to the various embodiments described above, the thermal sensor detects 32 directly the temperature (element temperature) of the power element TR in order to operate in response to that from the thermal sensor 32 supplied with temperature detection signal to make a request whether the high-temperature anomaly is present, however, the present invention is not limited to a structure, in which such a thermal sensor 32 is applied. For example, a detection circuit for detecting the turn-on duty ratio of the glow plug 20 be provided to perform an operation in response to the detected Einschalttastverhältnisrate so that a request is made whether a Hochtemperaturanomalie is present.

It are a glow plug control device and a glow plug control system disclosed, comprising: a power element (switching element), the one in a combustion chamber of a diesel engine provided glow plug turns on, a control IC for Control of the operation of the power element and a thermal sensor (Temperature detection device), which determines the temperature of the power element detected. The control IC has a power-on limiting device which has a turn-on duty ratio of the glow plug limited in the presence of a high temperature anomaly when the detected by the thermal sensor temperature a predetermined given Temperature exceeds.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 2006-152891 [0002]
• - JP 2006-153293 [0009]

Claims (15)

Glow plug control device, which in an internal combustion engine ( 10 ) with glow plugs ( 20 ) stored in combustion chambers ( 15 ) of the internal combustion engine are mounted, and a filter device ( 19a ) is used for capturing particles in exhaust gases, the glow plug control device being characterized by: a regeneration activation device ( 44 ; 35a ) for controllably switching on an electrical load such that an electrical load of a battery charged by the internal combustion engine ( 21 ) during execution of a regeneration operation of the filter device (FIG. 19a ) is raised to raise temperatures of exhaust gases to remove trapped particulates from the filter device, and wherein the glow plugs ( 20 ) during a start of the internal combustion engine ( 10 ) are turned on and also turned on, as the electrical load during the execution of the regeneration operation of the filter device ( 19a ) to serve. Glow plug control device according to claim 1, further characterized by switching elements (TR) for respectively switching on and off the glow plugs ( 20 ), a turn-on control device ( 31 ; 31a ) for controlling turn-on operations of the switching elements, and determining means (S20) for determining whether a high-temperature anomaly state exists at which temperatures of the switching elements exceed a predetermined given temperature, the turn-on control means (S20) 31 ; 31a S61) to limit on-duty ratio rates of the glow plugs when the determining means determines that the high temperature anomaly condition exists. Glow plug control device according to claim 2, further characterized by a temperature detection device ( 32 ) for detecting the temperature of the switching element, wherein the determining device ( 32 ) is responsive to the temperature detected by the temperature detecting means for determining whether the high temperature anomaly condition exists. Glow plug control device according to claim 2 or 3, characterized in that the regeneration activation device ( 44 ; 35a ) performs a turn-on control on a plurality of electric loads including the glow plugs during the execution of the regeneration operation, and the regeneration activating means (12) 44 ; 35a ) Duty cycle ratio rates of other electrical loads except the glow plugs in the presence of the high temperature anomaly state increases to levels greater than those of the electrical loads for normal operation. A glow plug control device according to claim 4, characterized in that the other electrical load comprises a plurality of other electrical loads, and the regeneration activating means (10). 44 ; 35a ) simultaneously increases duty ratio rates of the plurality of other electrical loads in the presence of the high temperature anomaly condition. Glow plug control device according to claim 4, characterized in that the other electrical load has a plurality of other electrical loads, and the regeneration activating device ( 44 ; 35a ) alternately increases duty cycle rates of the plurality of other electrical loads to increase the duty cycle rate of one of the plurality of other electrical loads in the presence of the high temperature anomaly condition. Glow plug control device according to one of claims 4 to 6, characterized in that the regeneration activation device ( 44 ; 35a ) interrupts the switching on of the other electrical loads for normal operation, even if the high temperature anomaly condition is present. Glow plug control device according to one of claims 2 to 7, characterized in that the regeneration activation device ( 44 ; 35a ) expands a turn-on time interval of the electric load in the presence of the high-temperature anomaly state to a value larger than that of the electric load for normal operation. Glow plug control device according to claim 2 or 3, characterized in that the regeneration activation device ( 44 ; 35a ) delays the execution of the regeneration operation when the high-temperature anomaly condition exists. Glow plug control device according to a of claims 2 to 9, characterized in that the Start-up limiting device (S40; S61) the on-load duty ratio by switching off the switching element or by reducing a Switching ratio limited. Glow plug control device according to one of claims 2 to 10, characterized in that the switch-on control device ( 31 ) controls the operation of the switching devices based on a command signal output from the command control device, and when the A turn-on limiting means performs a turn-on limitation in contrast to a command content of the command signal, the turn-on control means outputs a DIAG signal to the command control device to notify execution of the turn-on limit. A glow plug control device according to claim 11, characterized in that the internal combustion engine has a plurality of cylinders formed with the combustion chambers to which the glow plugs are attached, and the turn-on control means (Fig. 31 ) outputs the DIAG signal for each of the glow plugs. Glow plug control device according to a of claims 1 to 11, further characterized by switching elements for switching on and off the glow plugs and in which at the beginning of switching on the glow plugs with the execution of regeneration operation on-duty ratios of Switching elements are gradually increased. Glow plug control device according to a of claims 1 to 13, characterized in that the Glow plugs to support an initial Ignition of the internal combustion engine during a Starting it will be turned on, and also for stabilization of burns in the internal combustion engine during a After start time period are turned on. Glow plug control system with at least one the glow plug and the filter device and the glow plug control device according to one of claims 1 to 14.