JPS58140467A - Engine controlling apparatus - Google Patents

Abstract

PURPOSE:To prevent the vehicle battery from becoming flat when the engine condition is not good, by providing a means for limiting the time when a starting motor is driven continuously to a prescribed time and a means for determining said prescribed time according to the temperature at a particular place. CONSTITUTION:An engine controlling apparatus of this invention comprises one-shot multivibrators 1-5, flip-flops 9-10, a timer 14 and a thermistor 15. When a release button is pushed and a relief signal S3 becomes ''1'', the timer 14 is set to keep a starter driving signal S14 at ''1'' for a prescribed time period, and a starter motor is set into operation. Here, if the engine is not started within the prescribed time, the signal S14 is reset to ''0'' and the motor is stopped. The thermistor 15 is used for determining the set time of the timer 14. With such an arrangement, it is enabled to prevent the battery from becoming flat when the engine condition is not good.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an automobile engine (mainly an internal combustion engine), and more particularly to a device for automatically controlling engine stop and start.

In recent years, in order to save fuel consumption and reduce fuel consumption by idling when the car is stopped, such as when waiting at a traffic light or in a traffic jam, a device has been developed that stops the engine when the car stops and starts it when the car starts. Ru.

For example, the device described in Japanese Patent Publication No. 51-9085 automatically starts the engine by operating the accelerator pedal when the car is started, and when the car is stopped, the ignition circuit is de-energized by the driver's manual operation. It is configured to stop the engine by

In addition, the device described in [Engineering (Published by Railway Japan Co., Ltd.), November 1981 issue, pages 72 to 78] automatically stops the engine when the automatic east stops, and when the second start, the driver The engine is configured to automatically start when the clutch pedal is depressed.

As mentioned above, in conventional devices, when the starting conditions such as depressing the accelerator pedal or clutch pedal are fulfilled, the starter motor is driven, and when the starting is completed and the engine enters self-sustaining operation, it increases the engine rotational speed. The system was configured to automatically stop the starter motor upon detection.

Therefore, when the engine is malfunctioning and the engine does not start even if the starter motor is driven, the starter motor remains driven for a long time, causing the battery to run out of power and become dead. The present invention was made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide an engine control device that does not cause the battery to run out even when the engine is malfunctioning. .

In order to achieve the above object, the present invention has the following features.

The time period during which the starter motor is continuously driven is limited to a predetermined time period, and the starter motor is configured to be stopped after the predetermined time period has elapsed even if starting has not been completed.

Furthermore, in the present invention, by configuring the predetermined time to be automatically set to a value depending on the engine cooling water temperature, outside air temperature, etc., it is possible to start the engine reliably even when it is difficult to start at low temperatures. That's what I do.

The present invention will be described in detail below based on the drawings.

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a signal waveform diagram of the circuit of FIG.

In FIG. 1, SL is the parking brake signal, which is 1" when the parking brake is applied as will be explained in detail later.
, when it is not applied, it becomes O”.

Also, S2 is the Igni/Yonsuinochi signal;
It becomes 1" when Yonsui Inochi is on.

Further, S3 is an IJ IJ-S signal, which is 1'' when the parking brake release button, which will be described in detail later, is pressed.

Further, S4 is a starter signal, which is "1" while the starter inch for operating the starter motor is on.

Further, S5 is a single rotational speed word, and is a voltage signal proportional to the engine rotational speed. As this rotational speed signal S5, for example, the neutral point voltage of the alternator may be used,
Alternatively, in an engine having a crank angle sensor that outputs a pulse every time the crank angle of the engine rotates by a predetermined angle, the number of pulses converted into voltage may be used.

Also, 814 is a starter drive signal, and this signal is 1"
The starter motor operates during this time. Further, 815 is a two-wheel cut signal, and while this signal is "1", the fuel supply to the engine is cut off.

Next, 1.2.3.4 and 5 are one-shot multivibrators, and when the input signal rises, a narrow trigger signal s6. s,, s8. s.

and 815 (details regarding 813 will be described later).

Further, 6, i and 8 are OR circuits, 9 and 10 are flip-flops, and 11 is an AND circuit.

Further, 12 is a comparator which is "1" when the value of the 1 rotation speed signal S5 is less than a predetermined reference voltage 78.

In the above case, a signal S9 which becomes "0" is output. The value of the reference voltage Vs is the lowest value 1 when the engine rotates independently.
For example, it is set to a value corresponding to 400 rpm. Therefore, when the signal S9 is 1", it indicates that the engine is stopped or cranking, and when it is 0", it indicates that the engine is running (
Indicates that the engine has started and is in autonomous operation).

13 is an inverter that inverts and outputs the signal S9;
14 is a timer, which outputs a starter drive signal S14 that becomes 1'' for a predetermined time set by a variable resistor R from the time when the signal S1° rises.
When the signal S1o is applied to the reset terminal R, it is set and the signal 814 immediately becomes "0".

Next, a device for outputting the parking brake signal S1 and release signal S5 will be explained.

FIG. 6 is an example of a parking brake operating device for operating the parking brake.

In Fig. 6, 20 is a two-lower panel of the vehicle body;
A parking brake placket 21 is bolted to the floor panel 20. Also, 22 is a parking lot.
, the teeth provided on zi, 23 are -μ Roux levers, 24
25 is a release button that unlocks the parking brake lever 26; 25 is a pawl that engages with the teeth 22 and locks the parking brake lever 26 in the pressed position; 26 is a rod that connects the release button 24 and the pawl 25; 27 is the return spring, and the release button 24° rod 2
6 and claw 25 are always pushed to the left in the drawing. 28 is a stopper for the return spring 27, which is fixed to the parking brake lever 26.

29 is a pin that supports the pawl 25 on the parking brake lever 23; 30 is a pin that connects the rod 26 and the pawl 25;
1 is a pin that rotatably supports the parking brake lever 23, 62 is a parking brake cable, 63 is a switch fixed to the parking brake lever 23, and 34 is a floor panel 2.
Switch fixed at 0, 35 is parking brake lever 2
6 is a pressing portion that presses the button of the switch 34.

Next, the effect will be explained.

The state shown in FIG. 6 is a state in which the parking brake is not applied at all.

When the driver pulls the parking brake lever 26 upward in the drawing from this state, the parking brake cable 62 is pulled to the left in the drawing, and a parking brake (not shown) is applied. Since the pawl 25 engages with the teeth 22, the parking brake lever 26
is held in the raised position. Also, at this time, the pressing part 35 is in a state of pressing the button of the switch 4.

The switch 54 is turned on, and the parking brake signal S1 of FIG. 1 becomes °°1''.

On the other hand, when the release button 24 is pushed to the right in the drawing by the driver, the pawl 25 and teeth 22 are disengaged, so that the parking brake lever 26 can be pulled down. When the parking brake lever 23 is pulled down in this state, the parking brake cable 62 returns to the right side of the drawing, and the parking brake (not shown) is released, and the switch 64 is turned off, so the parking brake signal S1 becomes O''.

Also, while the IJ-switch button 24 is pushed to the right in the drawing, the upper part of the claw 25 is pushing the button of the switch 66, so the switch 6 is turned on.

The IJ signal S5 in FIG. 1 becomes 1''.

When the driver stops pressing the IJ button 24, the claw 25 returns to its previous position due to the force of the return spring 27, so the switch 63 is turned off and the release signal S5 becomes "o".

As mentioned above, while the parking brake is applied, the parking brake signal S1 becomes "1" and the IJ I
While the J-button 24 is pressed, the release signal S
3 becomes "1". As can be seen from the above explanation, it is necessary to press the release button 24 to release the parking brake once applied.

Therefore, when releasing the parking brake, the release signal S5 always becomes "1".

Although the example in Fig. 6 shows a case where a so-called handbrake is used as the parking brake, other types of parking brakes, such as those installed in front of the driver's seat and pulled toward the driver by the driver, can be used to activate the parking brake. The present invention can be applied in the same way even to the shaded type.

The operation of the circuit shown in FIG. 1 will be explained in detail below with reference to FIG.

First, when the ignition switch is turned on at time t1 in FIG. 2 with the engine completely stopped, the ignition switch signal s2 becomes "1". Therefore, the one-shot multivibrator 2 outputs a trigger signal S7, which is applied to the reset terminals R of flip-flops 9 and 10 via OR circuits 6 and 7, respectively. Therefore, both flip-flops 9 and 10 are reset, and the Q outputs (the Q output of 9 is S15, the Q output of 1o is Sl) are both 0". In this state, the starter drive signal 814 and the fuel cap signal S+s are both °0'' and is ready to start.

Next, at time t2, the starter switch is turned on.

When the starter signal S4 becomes "1", this signal is applied to the one-shot multivibrator 6 via the OR circuit 8, and the one-shot multipipe rake 3 outputs a trigger signal S8.

This trigger signal S8 is applied to the cent terminal S of the flip-flop 1o, so that the signal S11 of the Q output becomes 1''.This trigger signal S8 is applied to the reset terminal 1 of the flip-flop 9 via the OR circuit (Since it is also given to the trigger signal S8, when the trigger signal S8 is output, the fuel tank signal 815 is always 0'', and the fuel can be supplied.

On the other hand, at time t2, the engine has stopped, so the rotational speed signal S5 is at a low level, so the comparator 1
The signal S9 of No. 2 is "1".

Since both the signal S11 and the signal S9 are 1'' as described above, the signal 812 of the AND circuit 11 becomes 1'', so the timer 14 is set and the starter drive signal 81
4 becomes "1" for a predetermined time τ.

While the starter drive signal 814 is "1", a starter motor drive device (not shown) operates to rotate the starter motor and start the engine. Furthermore, at this time.

As noted, the fuel injection signal 815 is 0'', so the fuel injection device (not shown) is operating normally.

It supplies fuel.

Furthermore, when the starter drive signal 814 becomes 1", the one-shot multivibrator 5 outputs the trigger signal S15 with a slight delay from that point. The flip-flop 10 is reset by this trigger signal 813, and the signal 811
And S12 returns to "0".

As mentioned above, in order to output the signal 815 with a slight delay from the time when the signal S14 rises, use a one-shot multivibrator 5 in which two one-shot multivibrators are connected in series, and output the signal S14.
The first one-shot multivibrator may be triggered when the signal 14 rises, and the next one-shot multivibrator may be triggered when the output of that one-shot multivibrator falls.

Next, if the start is completed within Y time τ1 and the engine starts self-sustaining operation, the engine speed will gradually increase, and at time t5, the speed signal S5 will reach the reference voltage 78.
That's all. Therefore, the signal S9 of the comparator 12 becomes "0" and the output of the inverter 13 becomes "1", so the one-shot multivibrator 4 outputs the trigger signal S1o.

This trigger signal 810 is applied to the reset terminal of the timer 14, and the timer 14 is reset even if it is within the predetermined time 11, and the starter drive signal 814 returns to "0".

Note that since the trigger signal 810 is also applied to the reset terminal R of the flip-flop 10 via the OR circuit 7, the flip-flop 10 is also reset.

Next, when starting the car, the release button is pressed at time t4 to release the parking brake, and the release signal S5 becomes "1". This signal is applied to the one-shot multivibrator 6 via the OR circuit 8, and as a result, the trigger signal S8 becomes 1'', so that the flip-flop 10 is turned on.

The signal 811 becomes "1". However, at this time, the engine is already running and the signal S9 is "0", so the signal 842 output from the AND circuit 11 is
Therefore, the timer 14 is not clocked, so the starter drive signal 814 is "0", and therefore the starter motor is not driven.

Next, the parking brake is released (parking brake signal S1 is 0
”), the release button is returned at the second time point t5, and the release signal S5 becomes “D”.

In this state, the first engine start is completed and the vehicle is ready to run.

In the above explanation, the first start is performed using the starter signal 84.
(Turning on the starter switch) is shown as an example, but as can be seen from FIG. The first start can also be performed by pressing the 'J' button.

Next, a case will be described in which the engine is stopped using the parking brake.

First, at time t6, when the parking brake is applied, the parking brake signal S1 becomes 1", and the multivibrator 1 outputs the trigger signal S6. Therefore, the flip-flop 9 is set, and its Q output, that is, the two-nil cut signal 815 becomes "1". "become.

When the tunnel cut signal 815 becomes "P1", the PM injection device (not shown) cuts off the fuel supply.

The engine will stop.

Note that the trigger signal S6 is applied to the flip-flop 10 via the OR circuit 7, so the flip-flop 10 is reset and the signal S11 becomes "0".

Then the engine stops and the rpm gradually decreases.

When the rotational speed signal S5 becomes less than the reference voltage 78 at time t7, the signal S9 becomes 1''.

Next, a case in which the engine is started using the release button will be explained.

First, at time t8, when the driver presses the release button to release the parking brake, the release signal S3 becomes "
It becomes 1″.

When the release signal S5 becomes "1", the trigger signal S8 outputted from the one-shot multivibrator 6 becomes "1" as described above.

This trigger signal S8 is applied to the reset terminal R of the flip-flop 9 via the OR circuit 6. Therefore, the flip-flop 9 is reset and the two-nil cut signal 81
5 becomes 0", and fuel injection becomes possible. - Also, the trigger signal S8 sets the flip-flop 10 in the same way as above, so the signal S11 becomes "1", and at this time, the engine is stopped. Since the signal S9 is "1", the signal 812 of the AND circuit 11 becomes "1", so the timer 14 is set and the starter drive signal 844 is set.
becomes "1", and the starter motor operates to start the engine in the same way as above.

Further, in the same way as above, the starting is completed within the predetermined time 14 set by the timer 14, and the rotation speed signal S5 becomes the reference voltage 7.
If it becomes 8 or more, the signal S9 becomes "0", the starter drive signal S14 becomes "0", and the starter motor stops.

Next, a case will be described in which the engine is malfunctioning and does not start within the predetermined time 11.

First, at time t9, the release button is pressed.

When the IJ IJ-S signal S5 becomes "1", the timer 14 is set by the same action as described above, and the predetermined time τ1
During this period, the starter drive signal 814 becomes "1" and the starter motor is driven.

However, if the engine does not start within the specified time 11,
At the time too when the predetermined time τ has elapsed, the starter drive signal S14 returns to 0' and the starter motor stops.

Then, the release button is pressed again and the release signal S5
(or starter signal S4) becomes 1".

Similarly to the above, the starter motor is driven for a predetermined time τ.

Note that the value of the above-mentioned predetermined time τ1 is a value 2 that takes into account the time required for the engine to start under normal conditions, with some margin added.
For example, set it to a few seconds to a few seconds.

With the above configuration, even if the engine is out of order and does not start easily, there is no fear that the starter motor will remain driven and the battery will run out.

Next, FIG. 4 is a circuit diagram of another embodiment of the present invention.

The circuit shown in FIG. 4 uses a thermistor 15 as a resistor for setting the predetermined time τ1 of the timer 140.

The configuration is such that the value of the predetermined time τ is automatically changed according to the temperature. Configurations other than those listed above.

The operation is similar to the circuit shown in FIG.

As we all know, how long does it take to start an engine?

It varies considerably depending on the temperature and becomes longer at low temperatures. Therefore, as shown in Figure 4, if the value of the predetermined time τ1 is set to one shift according to the temperature, that is, a value that is long at low temperatures and short at high temperatures, it will start reliably even at low temperatures. In addition, it is possible to prevent battery power from being wasted due to continuous starting for a long time when the temperature is high.

It is ideal if the temperature of the combustion chamber of the engine itself can be detected, but the temperature of the cooling water of the engine or the temperature of the outside air is also sufficiently effective. The above-mentioned thermistor 15 (or other temperature-sensitive element) is installed, for example, in the water jacket of the engine, depending on the location where the temperature is to be detected.

Further, in the embodiments shown in No. 1 () and Fig. 4, the present invention is applied to a device that stops the engine by applying the parking brake and starts the engine by pressing the release button of the parking brake. However, it goes without saying that the present invention can also be applied to other methods, such as methods in which the engine is started by depressing the accelerator pedal or the clutch pedal.

Although the actual winding examples shown in FIGS. 1 and 4 illustrate the case where the present invention is constructed using two ordinary hardware, it is of course possible to perform similar control using a microconbeater. For example, when the present invention is applied to an automobile equipped with a centralized engine control device using a microcomputer, the present invention can be implemented simply by changing the program of the microcomputer.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention, FIG. 2 is a signal waveform diagram of the circuit of FIG. 1, FIG. 3 is a diagram of an example of a parking brake operating device, and FIG. 4 is another embodiment of the present invention. This is an example diagram. Explanation of symbols 1 to 5... One-shot multivibrator 6 to 8.
...OR circuit 9-10...Flip-flop 11...AND circuit 12...Comparator 13...
・Inverter 14...Timer 15...Thermistor Sl...Parking brake signal S2...Igni/Yonsuinochi signal S5...Release signal S4...Starter signal S
5... Rotation speed signal 814... Starter drive signal 815... Fuerukanoto signal Patent attorney Junnosuke Nakamura

Claims (1)

[Claims] 1. The engine is automatically stopped when predetermined stopping conditions are satisfied, and the starter motor is driven when predetermined starting conditions are satisfied, and the starter motor is stopped when starting is completed. In the engine control device configured as above, a means is provided for limiting the time during which the starter motor is continuously driven to within a predetermined time, and the starter motor is stopped even if the starting is not completed after the predetermined time elapses. An engine control device that is specially designed to 2. An engine control configured to automatically stop the engine when a predetermined stopping condition is satisfied, drive a starter motor when a predetermined starting condition is satisfied, and stop the starter motor when starting is completed. In the device,
A first means for limiting the time during which the starter motor is continuously sounded within a predetermined time, and a second means for setting the predetermined time to a value corresponding to the temperature. An engine control device that stops a starter motor after a predetermined period of time has elapsed, even if starting has not been completed. 3. The engine control device according to claim 2, wherein the second means sets the value of the predetermined time depending on the engine cooling water temperature or the outside air temperature.