JPS611866A - Auxiliary starter for diesel engine - Google Patents

Abstract

PURPOSE:To start an engine automatically with high efficiency by providing a fuel injector, control circuit section for controlling a glow plug and a ribbon heater and cranking means for repeating the starting sequence. CONSTITUTION:Control circuit section 2 will receive an engine starting signal, starter C-terminal signal, a cooling water temperature signal, alternator voltage, etc. to produce control signals for a ribbon heater relay, a glow plug relay, a starter relay, an injector, and for lighting/flickering a monitor lamp. While cranking means 3 will receive starter M-terminal signal and a mission position detecting signal in addition to the control signals from the control circuit section 2 to produce a control signal for repeating the starting sequence untill the engine will start. Consequently, the engine can be started automatically with high efficiency even in cold district.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a starting aid device for a diesel engine, and in particular to a starting aid device for a diesel engine that changes the engine starting procedure depending on temperature conditions and that automatically starts the engine quickly. The present invention relates to a starting assist device for a diesel engine that generates a control signal.

(Background of the invention and problems) Diesel engines differ from gasoline engines in that
Engine startability is extremely poor at low temperatures. Therefore, an engine starting aid device is used.

After warming up the engine with a heater, glow plug, etc., the starter is rotated to start the engine.

Conventional diesel engine starting aids.

The engine is preheated based on the driver's intuition.

For example, if the temperature is low and the engine warm-up time is short.

Injection nozzles and piston rings become severely corroded and worn, which harms the engine. Another disadvantage is that one hour is wasted if the engine is warmed up even when the temperature is high, and processing is not adapted to warm up the engine depending on the i degree condition.

Furthermore, with the automation of vehicle driving, engine starting aids automatically warm up the engine according to temperature conditions, and when the engine has warmed up to an appropriate temperature, it automatically starts. It is desired to realize an engine starting aid device.

(Object and Structure of the Invention) The present invention aims to solve the above-mentioned drawbacks and demands, and allows the engine to automatically start according to the temperature conditions at that time simply by the driver turning on the switch. The purpose is to provide a starting aid for diesel engines. Therefore, the diesel engine starting aid device of the present invention is a diesel engine starting aid device that warms up and starts the engine at low temperatures, and is equipped with a plurality of switches that operate at different temperatures. A control circuit section that generates control signals to the heater relay, glow plug relay, and fuel injection device based on a combination of operating conditions, and a miso silane position detection signal and a starter engagement signal. The controller includes a cranking means for generating a control signal for driving a starter relay and repeating cranking when the engine does not start within a predetermined time.

The present invention is characterized in that when starting the engine, the control signal is sent out in accordance with temperature conditions based on the operating states of the plurality of switches, thereby generating a control signal for automatically starting the engine. This will be explained below with reference to the drawings.

(Embodiments of the Invention) Fig. 1 is a signal diagram explaining the controller section of the diesel engine starting assist device according to the present invention, and Fig. 2 is a flow chart explaining the operation of the controller section. It shows.

In FIG. 1, reference numeral 1 represents a controller section, 2 a control circuit section, and 3 a cranking means.

The controller unit 1 is composed of a CPU, a ROM that stores programs, a RAM that stores data, etc., and an interface that exchanges input and output.

The control circuit section 2 that constitutes the controller section 1 is as follows.

A ribbon heater relay that receives signals such as the engine start signal to start the engine, the starter C terminal signal, the coolant temperature signal, and the alternator voltage.

Generates control signals for glow plug relays, starter relays, fuel injection devices, monitor lamps, etc.

Further, the cranking means 3 constituting the controller section 1 receives various control signals from the control circuit section 2, as well as a starter M terminal signal, a mission position detection signal, etc.

■ Function to prevent meshing with the starter while the engine is rotating ■ Function to prevent meshing with the engine while the starter is rotating due to inertia ■ Reactivation function in case of starter misalignment ■ Repeated cranking function (for example, if the starter is rated for 30 seconds, If the engine does not start even after 30 seconds of cranking, stop the engine for a specified period of time, then crank it again. If the engine does not start within 30 seconds, then crank the engine again after the specified period of time has elapsed. This process is repeated until the engine starts. Generates control signals for starter relays, monitor lamps, etc. to execute functions that repeat until

Next, input it to the controller section 1, or input it to the controller section 1.
We will briefly explain each signal output from.

The engine start signal is a signal that is input when the driver touches a touch switch, for example, when starting the engine, and upon arrival of the engine start signal, power is supplied to each part in the controller section l.

The starter C terminal signal is a starter activation signal.

The cooling water temperature signal can be detected at different temperatures 1, e.g. -30°C2
Thermo switches that operate at 0°C are installed to detect the evening water temperature, and a signal indicating the temperature of the cooling water is generated based on the combination of the operating states of these thermo switches. For the sake of explanation below, we will assume that the thermo switch operates at -30°C and 0°C, respectively, and when the cooling water temperature is 06°C or higher,
The explanation will be made on the assumption that a signal from 0°C to -30'C, -30'C or less is input. These temperature values are originally set arbitrarily.

The alternator voltage is the output voltage of the alternator for detecting whether the rotational speed of the engine is higher than that of the engine, that is, whether the engine is running.

The starter M terminal signal is an engagement confirmation signal that is output when the starter is engaged with the engine, and a signal that outputs the voltage when the starter is rotating.

The mission position detection signal is a mission neutral confirmation signal that is output when the mission is in the neutral position.

The starter relay control signal is a control signal for energizing a starter relay that constitutes a circuit that drives the starter.

The ribbon heater relay control signal is activated when the temperature of the cooling water in the radiator is -30°C or lower when the engine is started.
This is a control signal for energizing a ribbon heater relay that configures a circuit for preheating a heater to warm the air sent to the combustion chamber.

The glow plug relay control signal is used to warm the fuel injected into the combustion chamber when the temperature of the cooling water in the radiator is below 0.6C when the engine is started.

This is a control signal for energizing a glow plug relay that constitutes a circuit for preheating a glow plug provided near the injection nozzle.

The fuel injection device control signal is sent to the #1 sensor in order to adjust the amount of fuel to be injected when the temperature of the radiator cooling water is 1306C or less or 06C or less when the engine is started.
This is a control signal that causes current to flow to each register of #2 sensor.

The monitor lamp control signal is a control signal that controls lighting, flashing, etc. of the monitor lamp in order to notify the driver of the current operating state of the engine starting assist device.

In this way, the starter operating signal, starter engagement signal, coolant temperature, engine rotation, etc. are detected to automatically operate the starter and control the fuel injection device, glow plug, and ribbon heater until the engine starts. Figure 2 shows the operation of a diesel engine starting assist device that controls the engine so that it is easy to start based on the temperature of the radiator cooling water and automatically disengages the starter when the engine starts. This will be explained next using a flow chart.

When the driver presses the touch switch to start the engine (51), an engine start signal is sent to the controller unit 1.
Enter. As a result, power is supplied to each circuit in the controller section 1 via a power supply circuit (not shown), and the controller section 1 is turned on (52). At this time, temperature detection is performed based on the operating mode of the thermo switch that detects the radiator cooling water temperature (53). Cooling water temperature when starting the engine is below 130"C, -30°
From C to o'c, the coolant temperature signal input to the controller unit 1 differs depending on the temperature above 0°C, and the engine starting procedure changes accordingly (threshold values for these temperatures can be set arbitrarily as described above). (Needless to say, Shiroko).

(I) When the temperature of the cooling water is 0°C or higher, two thermostats
In the case where a cooling water temperature signal from combination a in which both switches are inoperative is input to the controller section I, it is immediately detected whether the engine is rotating (, 54, 56
．． 57). Determination as to whether the engine is rotating is made based on the alternator voltage input to the controller section 1, and when the engine is completely stopped, M detects whether the starter is rotating (58.59)
. A determination as to whether the starter is rotating is made based on a starter C terminal signal input to the controller section 1. When the starter is completely stopped, the transmission position is then checked (60), and it is determined whether it is in neutral (61). This determination is made based on the mission position detection signal input to the controller section 1. When it is confirmed that the transmission is in the neutral position, the controller section 1 outputs a control signal to the starter relay to energize the starter relay in order to rotate the starter (62). Then, it is determined whether the starter and the engine are engaged based on the starter M terminal signal input to the controller section 1 (63).
, the starter drives the engine when engaged.

The determination as to whether or not the engine has been started by driving the starter is determined by whether or not the alternator voltage input to the controller unit 1 is a predetermined voltage (64.65). When the engine speed is higher than the starting speed, the controller unit 1 outputs a control signal to disconnect the starter.

As a result, the starter is removed (66), and then the controller section 1 is turned off (67).

That is, when the temperature of the radiator cooling water is 0° C. or higher, the starter is rotated without warming up the engine, and the engine is automatically started.

Note that when the engine is driven by Stark and the engine speed does not reach the starting speed within the starter's rated time 1, for example 30 seconds, that is, when the engine does not start within the starter's rated time of 30 seconds (65,
69, 70), the controller unit 1 stops sending out the starter relay control signal that energizes the starter relay, and deenergizes the starter relay (71). and a predetermined time.

For example, after a pause of 30 seconds, the controller section 1 outputs a control signal to execute a step (73) of preheating the ribbon heater, which will be explained in (III) later.

In this way, starter burnout and noise 1. This prevents over-discharging of the engine and also controls the engine to start.

In addition, when the transmission is not in the neutral position (61), the gear is moved to neutral or the clutch is controlled to be off (6B), and a starter relay control signal is output to energize the starter relay. do. When the engine and starter do not mesh (63)
, the process is returned to the process of mi-notion position confirmation (60), and is repeated again from there.

Furthermore, when the engine speed is not zero (57) or the starter speed is not zero (59), the temperature of the cooling water is detected (53) in order to wait until these speeds have completely stopped before starting the engine. be returned to.

(If) If the temperature of the cooling water is between 0°C and -30°C, the activation signal for the thermo switch that operates at 0°C and the inactivation signal for the thermo switch that activates IJ+. This is a case where a cooling water temperature signal is input to the controller section 1 according to a combination of the above.

By inputting a cooling water temperature signal (54, 55).

The controller unit 1 outputs a glow plug relay control signal to energize the glow plug relay (75).

This preheats the glow plug and warms the fuel injected from the injection nozzle. At the same time, the controller unit 1 sends out a monitor lamp control signal m, causing the monitor lamp to flash to indicate that the glow plug is being preheated.

A fuel injector control signal that causes current to flow through the #2 sensor of the fuel injector is output to adjust the amount of fuel injected from the injection nozzle (76).

Hereinafter, the controller section 1 performs control that includes the process (1) of detecting whether the engine is rotating (56) and the subsequent steps.

In other words, the temperature of the radiator cooling water is from 0°C to -3°C.
When the time is between 060 and 060, the glow plug warms up the engine and automatically starts and starts the engine.

(III) When the temperature of the cooling water is 130'C or less, a cooling water temperature signal is input to the controller section 1 based on a combination of actuation signals in which two thermo switches are activated together.

In response to the input of the cooling water temperature signal (54, 55), the controller section 1 outputs a ribbon heater relay control signal,
The ribbon heater relay is energized (73). This preheats the ribbon heater and warms the air being fed into the combustion chamber. At the same time, the controller section 1
Sends a lamp control signal to turn on the monitor lamp indicating that the ribbon heater is preheating, and outputs a fuel injector control signal that causes current to flow to the #1 sensor of the fuel injector, causing injection from the injection nozzle. (74).

The engine is then warmed up by the ribbon heater, and warming is continued until the temperature of the radiator cooling water reaches -30'C or higher.When the temperature of the cooling water rises to -30'C, the state (ff) is reached. Moved to.

The engine is automatically started through the engine starting process (II) described above.

That is, when the temperature of the radiator cooling water is below 130"C, the ribbon heater warms up the engine to make it easier to start, and then the glow plug warms up the engine. Control is performed to automatically start the engine.

(Effects of the Invention) As explained above, according to the present invention, the starter operation signal, starter engagement signal, cooling water temperature, engine rotation, etc. are detected to automatically operate the starter and start the engine. The fuel injection system, glow plug, and ribbon heater are controlled based on the temperature of the radiator cooling water until the engine is in a state where it is easy to start.
In addition, since the cranking means generates a control signal that repeats the starting procedure until the engine starts, the engine can be efficiently and automatically started even in cold weather by the driver simply pressing the starting touch switch. can be done.

[Brief explanation of drawings]

FIG. 1 is a signal diagram explaining the controller section of the diesel engine starting assist device according to the present invention, and FIG. 2 is a flow chart explaining the operation of the controller section. In the figure, 1 is a controller section, and 2 is a control circuit section. 3 represents cranking means. Patent applicant: Sawafuji Electric Co., Ltd. Representative Patent Attorney Mori 1) Hiroshi (2 others) #1 Diagram

Claims (1)

[Claims] A starting aid device for a diesel engine that warms up and starts the engine at low temperatures is provided with a plurality of switches that operate at different temperatures, and at least a heater relay or a control circuit section that generates control signals to the glow plug relay and fuel injection device; and a control circuit section that generates control signals that drive the starter relay based on the mission position detection signal and the starter engagement signal. and a cranking means for repeating cranking when the engine does not start within a specified period of time, and the controller section is equipped with a cranking means for repeating cranking when the engine does not start within a specified period of time. 1. A starting assist device for a diesel engine, characterized in that it sends out a control signal and generates a control signal to automatically start the engine.