WO2019116738A1

WO2019116738A1 - Internal combustion engine driving control device and internal combustion engine driving control method

Info

Publication number: WO2019116738A1
Application number: PCT/JP2018/039547
Authority: WO
Inventors: 山田　哲也
Original assignee: ボッシュ株式会社
Priority date: 2017-12-11
Filing date: 2018-10-24
Publication date: 2019-06-20
Also published as: JPWO2019116738A1

Abstract

The purpose of the present invention is to enable a PTO operation in which an existing component is diverted to ensure equivalent operability and convenience to a PTO-dedicated volume without newly installing the PTO-dedicated volume. An electronic control unit 500 detects turn-on of a PTO main switch on the basis of an on/off signal, of the PTO main switch, input from the outside. Meanwhile, when vehicle stop information input from the outside is detected, the electronic control unit 500 temporarily adopts a setting value of a consecutively variable volume as a setting value of the PTO volume, calculates a target torque according to the setting value, and requests the execution of fuel injection according to the calculated target torque with regard to a fuel injection control for controlling the fuel injection to the internal combustion engine.

Description

Internal combustion engine drive control device and internal combustion engine drive control method

The present invention relates to an internal combustion engine drive control device and an internal combustion engine drive control method, and is particularly suitable for application to an internal combustion engine drive control device and an internal combustion engine drive control method having a power take-off function.

In specially equipped vehicles represented by cranes, freezers, mixers, etc., power take-off (PTO) that distributes part or most of the engine output as the torque required for the operation of special equipment such as cranes The provision of functions is well known (see, for example, Patent Document 1).

In order to set and adjust the desired torque, an accelerator pedal for traveling, a PTO dedicated accelerator volume provided exclusively for adjusting the PTO torque amount, a PTO dedicated switch, etc. are often used.

There are two types of use of PTO: when the operation outside the vehicle is suitable (for example, a crane vehicle) and when the operation at the driver's seat is suitable (for example, a road cleaning vehicle), the needs of the operator are It varies according to the type etc.
In particular, for the PTO operation outside the vehicle, from the viewpoint of the convenience of the operator etc., it was common to use the PTO dedicated accelerator volume and the PTO dedicated switch as described above. In general, only the accelerator pedal can be used for PTO operation at the driver's seat.

JP, 2015-130800, A

However, in vehicles where there is a constant demand for component placement space and simplification of configurations, etc., it is only a matter of placement space to dispose PTO dedicated volumes according to special equipment and similar parts. In addition, it is desirable to avoid as much as possible because it causes an increase in assembly work and the like in the manufacturing process and an increase in the inspection process.
On the other hand, for the operator, naturally, the setting operation of the PTO required torque necessary for driving the special equipment is desired to be as easy as possible and to have good operability.

The present invention has been made in view of the above situation, and the same operation as the PTO dedicated volume can be realized by diverting an existing component without newly establishing a PTO dedicated volume for setting operation of the PTO required torque at the driver's seat. An internal combustion engine drive control device and an internal combustion engine drive control method capable of enabling a PTO operation ensuring convenience.

In order to achieve the above object of the present invention, an internal combustion engine drive control device according to the present invention is:
An internal combustion engine drive control device that performs control operation of power take-off that supplies a part of power of an internal combustion engine to a special equipment by an electronic control unit (500),
The electronic control unit (500)
PTO required torque adjustment setting unit (50) to adjust the size of torque required for power take-off,
The PTO required torque adjustment setting unit (50)
On / off of the cruise main switch which detects ON of the PTO main switch based on the ON / OFF signal of the PTO main switch inputted from the outside, and turns ON / OFF execution of the constant speed traveling control inputted from the outside If the cruise main switch is detected to be off based on a signal,
Temporarily set the setting value input by the existing adjustment setting unit (60) as the setting value of the PTO required torque adjustment setting unit (50),
Calculate a target torque according to the set value of the PTO required torque adjustment setting unit (50),
It is characterized in that execution of fuel injection according to the target torque is requested to fuel injection control for controlling fuel injection to the internal combustion engine.

According to the present invention, by using the existing adjustment setting unit, PTO operation with the same operability and convenience as the PTO dedicated volume becomes possible without adding a new component, and therefore, the device configuration It is effective to be able to contribute to simplification and price reduction.

FIG. 3 is a functional block diagram representing functions required of the internal combustion engine drive control device in order to execute the internal combustion engine drive control processing in the embodiment of the present invention in the internal combustion engine drive control device in functional blocks. It is a flowchart which shows the procedure of the first half of the internal combustion engine drive control processing in embodiment of this invention. It is a flowchart which shows the procedure of the second half of the internal combustion engine drive control processing in embodiment of this invention. FIG. 8 is a schematic view schematically showing an example of change of PTO required torque with respect to change of set value of PTO volume and an example of change of engine rotational speed and target torque with respect to change of PTO required torque.

Hereinafter, the present embodiment will be described with reference to FIGS. 1 to 4.
The members and arrangements described below do not limit the present invention, and various modifications can be made within the scope of the present invention.
The internal combustion engine drive control device in the embodiment of the present invention is a specially equipped vehicle, for example, a road sweeper, etc., and is particularly suitable for a vehicle where a PTO (power take-off) operation is desired at the driver's seat. Specifically, such a specially equipped vehicle is, for example, a road cleaner.

An electronic control unit (ECU) 500 shown in FIG. 1 performs engine control, injection control, and the like of a special vehicle.
In the electronic control unit 500, the PTO required torque adjustment setting unit 50 is formed by software in addition to the conventional execution functions such as engine control processing, etc. to execute the internal combustion engine drive control processing in the embodiment of the present invention. It is possible.
The procedure of the internal combustion engine drive control process executed by the electronic control unit 500 will be described with reference to the flowcharts shown in FIGS. 2 and 3, and the functional blocks in FIG. 1 will be referred to as necessary.

First, an internal combustion engine drive control process according to an embodiment of the present invention will be generally described.
This internal combustion engine drive control process relates particularly to the setting operation of the PTO required torque at the driver's seat, and it is possible to divert a volume or a switch generally provided in the vehicle to the setting operation of the PTO required torque. The convenience of the PTO operation in the special vehicle, the simplification of the configuration, and the like can be realized without requiring addition.

The details will be described below.
When execution of the internal combustion engine drive control process by the electronic control unit 500 is started, it is first determined whether the PTO main switch (not shown) is turned on (see step S100 in FIG. 2).
The PTO main switch is not unique to the present invention, and is normally equipped on a special vehicle.

The electronic control unit 500 receives an on / off signal of the PTO main switch from the outside through the interface circuit 1.

If it is determined that the PTO main switch is not on (in the case of NO), it proceeds to the process of step S240 (see FIG. 3) described later, assuming that the PTO main switch is off.
On the other hand, when it is determined that the PTO main switch is on (in the case of YES), the respective processes of step S110, step S140, step S150 and step S200 (see FIG. 3) are performed in time division.

In step S140, the PTO required torque set by the operation of the PTO accelerator volume (not shown) is calculated.
Here, although the PTO accelerator volume is provided exclusively for PTO operation, it is not necessarily essential. Although the internal combustion engine drive control process in the embodiment of the present invention is originally capable of diverting the existing adjustment setting means to the PTO operation without providing the adjustment setting means dedicated to the PTO operation such as the PTO accelerator volume. The process of step S140 is applicable even when there is a PTO accelerator volume dedicated to PTO operation.

The PTO accelerator volume is, for example, configured to be rotatable in a predetermined angular range to adjust the PTO required torque, and the PTO required torque is set to a desired value between 0 and 100% in the rotational range It is possible.

Although the correlation between the PTO accelerator volume setting position (rotational position) and the PTO required torque with respect to the setting position is predetermined, the correlation is changed according to the usage form, ie, for example, a diagnostic tester It can also be rewritten using (not shown)). In step S140, the PTO required torque corresponding to the set position of the PTO accelerator volume is calculated using a predetermined arithmetic expression based on the correlation.

In the embodiment of the present invention, the set value of the PTO accelerator volume is externally input to the electronic control unit 500 through the analog / digital converter 2 as a voltage signal.
Similarly, the depression amount of the accelerator pedal, which will be described later, is input to the electronic control unit 500 as a voltage signal through the analog-to-digital converter 3. Furthermore, the set value of the PTO volume is input as a voltage signal through the analog-to-digital converter 4.
Further, on / off signals of the pair of switches (the increase / decrease switches) which can be increased / decreased are input from the outside to the electronic control unit 500 through the interface circuit 5.
In the embodiment of the present invention, the depression amount of the accelerator pedal, the set value of the PTO accelerator volume, the set value of the PTO volume, and the signal of the increase / decrease switch which are input from the outside form the existing adjustment setting unit 60. There is.
In particular, PTO volume and increment / decrement switch are examples of existing setting devices whose setting values can be changed continuously, and PTO volume setting values and increment / decrement pairs of switch on / off signals are existing. It is an example of the input signal input from a setting device.
Furthermore, it is also preferable to use, as an existing setting device, a volume adjustment volume of an audio device, a volume for adjusting a mirror angle, a slide setting device, a seesaw switch or the like.

Next, in step S150, the PTO required torque set by the operation of the accelerator pedal (not shown) is calculated.
The PTO required torque setting by this accelerator pedal is to replace the PTO volume etc. described later from the viewpoint of operability etc., as with the above-mentioned PTO accelerator volume, but from the viewpoint of securing diversity of PTO operation etc. It is also possible to respond to PTO operation with the accelerator pedal.

On the other hand, in step S110, it is determined whether the special vehicle has stopped.
The presence or absence of the vehicle stop may be performed by a conventional method of engine control or the like, and it is not necessary to perform the special process unique to the present invention.

Specifically, for example, the vehicle speed and the neutral signal, and the output signals of the sensors provided for detecting the operation of the clutch pedal, the brake pedal and the hand brake are comprehensively judged (see FIG. See F1 in 1).
The vehicle speed, the neutral signal, and detection signals of the operation of the clutch pedal, the brake pedal, and the hand brake are input to the electronic control unit 500 from the outside through the interface circuit 6.

When it is determined in step S110 that the vehicle is at a stop (in the case of YES), each processing of step S130 and step S190 (see FIG. 3) is performed in a time division manner.

On the other hand, when it is determined in step S110 that the vehicle is not stopped (in the case of NO), step S180 (see FIG. 3) is executed.

In step S130, the PTO required torque set by the operation of the PTO volume is calculated.
Here, “PTO volume” is used in this embodiment for the purpose of distinguishing it from the original function when using a continuously variable volume (not shown) at the driver's seat for setting the PTO required torque. Name.

The volume is adjustment setting means for setting the accelerator opening instead of the accelerator pedal. Usually, mechanical ones are used. For example, a knob is provided rotatably in a predetermined angular range, and the accelerator opening degree can be adjusted by changing the rotational position.

The PTO volume using such a volume can set the PTO required torque to a desired value between 0 and 100% in the above rotation range, but can be increased or decreased in recent years due to the problem of durability Digitized ones using a pair of switches are also in widespread use. For example, pressing the increase switch once increases the PTO required torque by several%, and pressing the lower limit switch once reduces the PTO required torque by several% so that the electronic control unit 500 processes the function equivalent to the volume. Do.

Although the correlation between the setting position of the PTO volume and the PTO required torque with respect to the setting position is predetermined, the correlation and the presence / absence of use are changed according to the usage form, that is, for example, a diagnostic tester etc. (not shown) It can also be rewritten using. In step S130, the PTO required torque corresponding to the set position of the PTO volume is calculated using a predetermined arithmetic expression based on the correlation.

Here, changes in the target torque of the PTO and changes in the engine rotational speed with respect to changes in set values such as the PTO volume and the PTO accelerator volume will be described with reference to FIG.
In FIG. 4, the characteristic diagram in which the vertical axis represents the PTO required torque with respect to the time axis of the horizontal axis, for example, changes the PTO volume from zero to the maximum value and returns it to zero again (PTO An example of change characteristics of the required torque is shown.

Above the example of the change characteristic of the PTO required torque, an example of change characteristics of the engine rotational speed and the PTO target torque with respect to the change of the PTO required torque is shown.
With respect to the change of the PTO volume as described above, the engine speed also increases and decreases substantially with the increase and decrease of the PTO volume.
Such a change in engine speed is also a change in PTO target torque.
Here, "PTO target torque" is a target value of torque desired for operation of the special equipment.

When the PTO main switch is turned on and the PTO operation is enabled, the idle speed is PTO to compensate for the decrease in engine speed due to the increase in engine load due to PTO operation. The operation is supposed to be increased more than usual when it is not effective. The dotted arrow in the idling region of the characteristic line of engine speed in FIG. 4 represents this increase in engine speed.

In FIG. 4, the numerical value representing the engine rotational speed described on the engine rotational speed axis is merely an example, and may vary depending on the specific specification of the vehicle and the like.
The changes in the engine rotational speed and the PTO target torque with respect to the setting of the PTO volume and the like described above are not specific to the present invention, and are basically the same as in the case of using the conventional PTO dedicated accelerator volume.

Next, the processes after step S160 will be described with reference to FIG.
First, in step S180, it is determined whether mobile PTO operation is permitted (see F2 in FIG. 1).
Here, "mobile PTO operation" means PTO operation performed when the special vehicle travels. The mobile PTO operation is permitted when it is traveling, for example, a special vehicle represented by a road cleaning car or a mixer car.

Whether or not the mobile PTO operation can be permitted depends on, for example, a predetermined flag or the like in an appropriate storage area of the electronic control unit 500 in advance when the internal combustion engine drive control device according to the embodiment of the present invention is mounted on a special vehicle. It is set in the form.
Therefore, in step S180, it is determined whether or not the mobile PTO operation can be permitted based on the stored data as to whether or not the mobile PTO operation stored in the appropriate storage area of the electronic control unit 500 can be permitted.

When it is determined in step S180 that the mobile PTO operation can be permitted (in the case of YES), the process proceeds to step S190.
On the other hand, if it is determined in step S180 that the mobile PTO operation can not be permitted (in the case of NO), the process proceeds to step S240.

In step S190, one of the results is selected when the determination of YES is made in step 180 or when the determination of YES is made in the previous step S110 (see FIG. 2).
Next, in step S200, a logical product (AND) of the processing result of step S190, the determination result of YES of the previous step S100 (see FIG. 2), and the determination result of YES of step S230 is obtained.

That is, if the determination in step S180 or step S110 is YES, the determination in step S100 is YES, and if the determination in step S230 is YES, logical "1" is set.

In step S210, when the logical product in step S200 is "1", it is determined that the PTO operation is valid (see F3 in FIG. 1).
In step S210, when it is determined that the PTO operation is valid (in the case of YES), the process proceeds to the process of step S280, while when it is determined that the PTO operation is not valid (in the case of NO), the process proceeds to the process of step S240. It will be.

On the other hand, in step S220, based on the processing results of steps S130 to S150 described above, when there is a plurality of PTO required torques, the maximum value among them is selected (see F4 in FIG. 1).

After the process of step S220, each process of step S230 and step S270 is performed time-divisionally.
First, in step S270, the PTO required torque selected in step S220 is converted into a target torque.
The PTO required torque represents a set amount of PTO volume and does not directly represent torque. The correlation between each PTO required torque and a specific target torque according to this PTO required torque is determined in advance, and in step S270, PTO is calculated by an arithmetic expression set based on such a correlation. A target torque corresponding to the required torque is calculated (see F5 in FIG. 1).

Next, the target torque calculated as described above is output to the separately executed fuel injection control process (see step S280 in FIG. 3 and F6 in FIG. 1).
It should be noted that upon execution of the process of step S280, it is premised that the PTO operation is determined to be valid in step S210 described above.

Next, a fuel injection request is made for the separately executed fuel injection control process (see step S290 in FIG. 3), and the fuel injection necessary to achieve the target torque is performed.
Next, the PTO operation lamp (not shown) is turned on (see step S300 in FIG. 3). After the execution of step S300, the series of processes are temporarily ended, and the process returns to the main routine (not shown).

On the other hand, in step S230, it is determined whether the PTO required torque is zero or not (see F7 in FIG. 1). The process of step 230 is performed only at the first time after the PTO main switch is turned on and the PTO operation becomes effective.

The PTO required torque is automatically reset to zero when the PTO main switch is turned off. Therefore, thereafter, immediately after the PTO main switch is turned on, the PTO required torque is usually zero.
However, if the PTO required torque by the previous operation or the like is effective immediately after the PTO main switch is turned on due to some cause, an originally unintended torque may be transmitted to the special equipment to operate.

Therefore, in consideration of safety of work by special equipment, if all PTO required torques do not become zero once, PTO required torque is prohibited (refer to step S240 in FIG. 3 and F8 in FIG. 1). . The prohibition of the PTO required torque in step S240 is also executed similarly when the determination of NO is made in any of the previous step S100, step S180 and step S210.

Then, the injection request required for the PTO operation is prohibited, and the engine is in an idling state (see step S250 in FIG. 3). At the same time, the PTO operation lamp (not shown) is turned off, and the series of processes are temporarily ended, and the process returns to the main routine not shown (see step S260 in FIG. 3).
By turning off the PTO operation lamp, the operator can recognize that the PTO operation state has been cancelled.

Claims

An internal combustion engine drive control device that performs control operation of power take-off that supplies a part of power of an internal combustion engine to a special equipment by an electronic control unit (500),
The electronic control unit (500)
PTO required torque adjustment setting unit (50) to adjust the size of torque required for power take-off,
The PTO required torque adjustment setting unit (50)
On / off of the cruise main switch which detects ON of the PTO main switch based on the ON / OFF signal of the PTO main switch inputted from the outside, and turns ON / OFF execution of the constant speed traveling control inputted from the outside If the cruise main switch is detected to be off based on a signal,
Temporarily set the setting value input by the existing adjustment setting unit (60) as the setting value of the PTO required torque adjustment setting unit (50),
Calculate a target torque according to the set value of the PTO required torque adjustment setting unit (50),
Request execution of fuel injection according to the target torque to fuel injection control for controlling fuel injection to the internal combustion engine
An internal combustion engine drive control device characterized by the above.
The existing adjustment setting unit (60)
It is a setter that can change the set value continuously
An internal combustion engine drive control system according to claim 1, characterized in that:
The PTO required torque adjustment setting unit (50)
Among the plurality of setting values of the PTO required torque adjustment setting means (50), the largest value is selected
The internal combustion engine drive control device according to claim 2, characterized in that:
The PTO required torque adjustment setting unit (50)
If all of the plurality of setting values of the PTO required torque adjustment setting means (50) immediately after the ON of the PTO main switch is detected are not zero, the plurality of set values of the PTO required torque adjustment setting means (50) The internal combustion engine drive control device according to claim 3, wherein the internal combustion engine drive control device is ineffective.
An internal combustion engine drive control device for performing control operation of power take-off by an electronic control unit (500) for supplying a part of power of the internal combustion engine to a special equipment, wherein the electronic control unit (500) is required for power take-off An internal combustion engine drive control method in an internal combustion engine drive control device comprising a PTO required torque adjustment setting unit (50) for adjusting the magnitude of torque, comprising:
A first step of detecting the on state of the PTO main switch based on an on / off signal of the PTO main switch input from the outside;
A second step of detecting off of the cruise switch based on a cruise switch on / off signal for turning on / off execution of constant speed traveling control input from the outside;
A third step of temporarily setting the setting value input by the existing adjustment setting unit (60) set in advance as the setting value of the PTO required torque adjustment setting unit (50);
A fourth step of calculating a target torque according to the set value of the PTO required torque adjustment setting unit (50);
And a fifth step of requesting execution of fuel injection according to the target torque with respect to fuel injection control for controlling fuel injection to the internal combustion engine.
An internal combustion engine drive control method characterized in that.