JPS58140442A - Engine controller - Google Patents

Abstract

PURPOSE:To enable to prevent a battery from running down without damaging of a heating performance, by a method wherein an automatic engine stopping mechanism is prevented from working at a cold time, at a middle open air temperature, it is operated only at a low speed and stopping time, and at a time when the open air is warm, it is normally operated. CONSTITUTION:If a parking brake is set during operation of an engine, a signal is brought to ''H'', and if an AND circuit is formed by means of the signal and a signal S0 of a temperature deciding circuit 5, a fuel cut signal is brought to ''H'' to stop the engine. In the temperature deciding circuit, if an open air temperature by a temerature-sensitive element 40 exceeds a warm set value VS2, an output S15 of a comparator 42 is brought to ''H'' to bring a signal S0 to ''H'', and an automatic-stopping mechanism is normally brought to a function state. Meanwhile, if it exceeds a middle open air temperature set value vS1, an output S14 of a comparator 41 is brought to ''H'', a signal S0, which forms an AND circuit only at a time when a change-over switch 46 for blower is set to a low and a stop, is brought to ''H'', and at a cold time being below the VS1, a signal S14 is brought to ''L'' to normally bring the output of the AND circuit 43 to ''L''. This enables to perform a saving of fuel cost and prevent a battery from running down without damaging of a heating performance.

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 reduce fuel consumption by idling when the vehicle is stopped, such as waiting at a traffic light or in traffic jams, devices have been developed that stop the engine when the vehicle stops and start the engine when the vehicle starts moving. .

The above device automatically stops the engine when the vehicle is stopped or the parking brake is not applied, and when the vehicle stops or the parking brake is not applied. The engine is configured to automatically start when the starting conditions are satisfied, such as when the parking brake release button is pressed.

However, in the above-mentioned devices, engine stop and start control was performed regardless of the outside temperature.
The heating inside the vehicle was insufficient.

That is, even in winter when the outside air temperature is very low, the engine will stop if other stop conditions are satisfied. As a result, there was a risk that the heating system would become ineffective and the comfort inside the room would be impaired.

Also, if the engine is stopped for a long time with the heating system's blower fan running, the battery in the car may over-discharge.
There was also a risk that the battery would be in a dead state, making it impossible to restart.

The present invention was made to solve the above problems, and an object of the present invention is to provide an engine control device that does not impair heating performance and does not cause a battery to run out.

In order to achieve the above object, the present invention does not operate the automatic engine stop mechanism in order to give priority to heating in cold situations where the outside air temperature is below a predetermined temperature, but when the outside air temperature is moderate. The automatic shut-off mechanism is configured to operate only when the blower fan is operating at low speed or stopped, which places a small burden on the battery, and to operate the automatic shut-off mechanism at all times in warm conditions where the heating device is unlikely to be used. are doing.

The present invention will be explained in detail based on the following.

FIG. 1 is a schematic diagram of one embodiment showing the entire apparatus of the present invention, and FIG. 2 is a signal waveform diagram of the circuit of FIG. 1.

In FIG. 1, So is a temperature determination signal, which is output from the temperature determination circuit 5 as will be described in detail later, and is "1'" or "1'" depending on the outside air temperature and the operating conditions of the blower fan of the heating device.
It becomes o”.

Further, Sl is a brake signal for car F, which is "1" when the parking brake is applied as will be described in detail later, and becomes ++O++ when it is not applied.

The switched S is an ignition switch signal, and becomes "1" when the ignition switch is on.

1 and S3 is a release signal, which becomes P1'' while the parking brake release button, which will be described in detail later, is pressed and held.

t, * S4u starter signal, while the starter switch to operate the starter motor is on 6
1'', and S5 is a rotational speed signal, which is a voltage signal proportional to the engine rotational speed.This rotational speed signal S5 is as follows.
For example, the neutral point voltage of the alternator may be used, or in the case of an engine that has a crank angle sensor that outputs a pulse every time the engine crank angle rotates by a predetermined angle, the frequency of the pulse is converted into voltage. may also be used.

Also, S12 is a starter drive signal, and this signal is °'
The starter motor operates for 1''.

S13 is still a fuel signal, and this signal is
During ``1'', the fuel supply to the engine is cut off.

Next V 1.2.6 and 4 are one/yotsuto-1 respectively.
- It is a multivibrator, and outputs narrow trigger signals S6, S7, S8, and S1o, respectively, when the input signal rises.

Further, 5 is a temperature determination circuit which will be described in detail later.

Further, 6, 7 and 8 are OR circuits, 9 and 10 are solinob flops, and 11 and 12 are AND circuits.

16 is a comparator which outputs a signal S which becomes PA1' when the value of the rotational speed signal S5 is less than a predetermined reference voltage 8; Reference voltage V
The value of S is set to the lowest value when the engine rotates independently, for example, a value corresponding to 400 rpm. Therefore, when the signal S9 is '1', it indicates that the enodine is stopped or cranking is in progress, and when it is 'o', it indicates that the engine is operating (starting has been completed and the engine is running independently).

The trench 14 is a signal 1 which inverts the signal S and outputs it.

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 from a state where the engine is completely stopped, the ignition switch signal 1S2 changes to °"1.
Therefore, the iblator 2 outputs the trigger signal S7, which is applied to the reset terminal R of the flip-flop 9, 10 via the OR circuits 6 and 7, respectively.

Therefore, both flip-flops 9.1o are reset, and the Q outputs (Q output of 9 is S, Q output of 10 is 511) both become "0". In this state, the starter 1 drive signal S12 and fuel tank signal S1
3 are both at °'0'' and ready to start.

Next, at time point 12, the starter switch is turned on, and when the starter signal S4 becomes '1'', this signal is given to the horn/yacht multivibrator 3 via the OR circuit 8.
The W/7 Yonoto multi-by-break 6 outputs a trigger signal S8.

This trigger signal S8 is given to the set terminal S of the flip-flop 1o, so the Q output signal S11 is "1".
”. This trigger signal S8 is also given to the reset terminal 1 (・) of the flip-flop 9 via the OR circuit 6, so when the trigger signal S8 is output, the fuel cap signal S16 is always “0°”. ” and becomes ready for fuel supply.

On the other hand, at time t2, the engine is stopped, so the rotational speed signal S5 is at a low level, so the comparator 1
The signal S of No. 6 is "1".

Since both the signal S 1 and the signal S9 are 1 "1" as described above, the starter drive signal S12 output from the AND circuit 11 also becomes II II II.

While the starter drive signal S12 is °'1'', the starter motor drive device (not shown) operates [7], the starter motor rotates, and the engine is started. ' Therefore, the fuel injection device (not shown) is operating normally and is supplying fuel.

Next, the engine speed gradually increases, and at time t3, when the speed signal S5 becomes equal to or higher than the reference voltage ■8, that is, when starting is completed and the engine begins self-sustaining operation, the signal S becomes II OII. . Therefore, AND circuit 11
The starter drive signal S12 outputted from the motor also becomes "0", and the starter motor stops.

Note that when the signal S becomes 0', the output of the inverter 14 becomes 1', and the one-shot multivibrator 4 outputs the trigger signal S1o.

This trigger signal S1o is applied to the bottom terminal R of the flip-flop 10 via the OR circuit 7, so the flip-flop 10 is reset and the signal S11 becomes "o".
"become.

Next, when starting the car, the parking brake is released, so the IJ button is not pressed at time t4, and the release signal S3 becomes "1". This signal is applied to the one-shot multivibrator 5 via the OR circuit 8, and as a result, the trigger signal S8 becomes 1'', the flip-flop 10 is set, and the signal S11 becomes 1''.
However, at this time, the engine is already operating and the signal S9 is "0", so the starter drive signal S12 output from the AND circuit 11 is "0".
”. Therefore, the starter motor does not operate.

Next, the parking brake is released (parking brake signal S1 is
Then, at time t5, the release button is returned and the release signal S3 becomes "o".

In this state, the first engine start is completed and the vehicle is ready to drive during automatic operation.

In the above explanation, the first start is performed using the starter signal S4 (
1), the starter signal S and the release signal S are used identically via the OR circuit 8, so IJ IJ- The first start can also be performed with the start signal S3 (pressing the release 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 "i". At this time, the temperature determination signal S mentioned above. If is 1'', the output of the AND circuit 12 approaches 1'', so the one-shot multivibrator 1 outputs the trigger signal S6.

Therefore, the clip-flop 9 is set, and the child Q output signal, that is, the fuel signal S13 becomes °'1''.

When the fuel injection signal S13 reaches "1", the fuel injection device (not shown) cuts off the fuel supply, and the engine stops.

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".

Next, the engine stops and the rotation speed gradually decreases until time t
When the rotational speed signal S5 becomes less than the reference voltage 78 at 7, the signal S9 goes to 0.1''.

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 is activated.
1”.

When the release signal S3 becomes 1", one/
The trigger signal S8 output from the yacht multivibrator 6 becomes "1".

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 fuel cut signal S13 becomes °゛D''°, and the trigger signal S8 becomes the same as before.
is set, the signal S11 becomes "1", and since the engine is stopped at this time and the signal S9 is "1", the starter drive signal S12 output from the AND circuit 11 becomes "P1"". , the starter motor operates and the engine starts in the same way as above.

When starting is completed and the rotation speed signal S5 becomes equal to or higher than the reference voltage V8, the signal S becomes tt O++, the starter drive signal S12 becomes "0", and the starter motor stops, as described above. .

Next is the temperature judgment signal S. The case where is II Ofi+ will be explained.

Temperature judgment signal S, which will be explained in detail later. becomes 0'' when the outside air temperature is less than the first predetermined temperature, and when the outside air temperature is higher than the first predetermined temperature and less than the second predetermined temperature, and the blower fan of the heating device is not stopped or operating at low speed. Become.

In this state, if the parking brake is applied at time t, even if the parking brake signal S1 becomes 1'', the temperature determination signal S is 0'', so the output of the AND circuit 12 is 0'' and 41, therefore, the one/yoto multivibrator 1 is not triggered and the flip-flop 9 is not set, so the fuel cap signal S1.
If you leave it as is, the engine will not stop.

As described above, the circuit shown in FIG. 1 is configured to operate or stop the automatic stop mechanism depending on the outside air temperature and the operating status of the blower fan of the vehicle-mounted heating device.

Next, a device for outputting the parking brake signal S1 and release signal S3 will be explained.

FIG. 5 is an example of a parking brake operating device for operating the parking brake.

In FIG. 6, 20 is a floor panel of the vehicle body, and a parking brake bracket 21 is bolted to the floor panel 20. Also, 22 is parking brake placket 2
1, 26 is a parking brake lever; 24 is a release button for unlocking the parking brake lever 23; 25 is a pawl that engages with the teeth 22 and locks the parking brake lever 23 in an arbitrary position; 26; 27 is a return spring that connects the release button 24 and the claw 25;
And the claw 25 is 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. Further, 29 is a pin that supports the pawl 25 on the parking brake lever 26, and 30 is a pin that supports the pawl 25 and the pawl 2.
5, 61 is a pin that rotatably supports the parking brake lever 23, 62 is a parking brake cable, 36 is a switch fixed to the parking brake lever 26, 64 is a switch fixed to the floor panel 20, 35
is a part of the parking brake lever 26, which is a pressing part that presses the button of the switch 64.

Next, the action 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 up the parking brake lever 23 upward in the drawing from this state, the parking brake cable 52 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
be held in the raised position. At this time, the pressing part 35 is in the state of pressing the button of the switch 34, so the switch 64 is turned on, and the parking brake signal S1 shown in 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 23 can be pulled down. If the parking brake lever 26 is pulled down in this state, the parking brake cable 32 will return to the right side of the drawing, and the parking brake (not shown) will be released, and the switch 64 will be turned off, so the parking brake signal S1 will be changed to °゛0''' become.

Further, while the IJ IJ button 24 is pressed to the right of the concave surface, the upper part of the claw 25 is pressing the button of the switch 36, so that the switch 66 is turned on and the release signal S3 in FIG. It becomes 1″.

When the driver stops pressing the release button 24, the force of the return spring 27 causes the pawl 25 to return to its previous position, turning off the switch 63 and outputting the release signal S6.
is "'0".

While the parking brake is applied as described above, the parking brake signal S1 is set to "1", and while the release button 24 is pressed, the release signal S6 is set to "1".
become. As can be seen from the above explanation, when releasing the parking brake once applied, it is necessary to press the IJ button 24. Therefore, when releasing the parking brake, the release signal S3 is always set to °゛1. ”
become.

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 exactly the same way to the multiplication square method.

Next, the temperature determination circuit 5 described above will be explained.

FIG. 4 is a circuit diagram of one embodiment of the temperature determination circuit 5.

In FIG. 4, a temperature sensing element 40 is a sensor that detects outside air temperature. As the temperature sensing element 40, for example, a thermistor whose resistance value decreases as the temperature rises may be used.

The temperature sensing element 40 and the resistor R1 generate a power supply voltage V. The voltage (1) obtained by dividing 0 decreases as the outside temperature rises.

Next, the comparator 41 compares the first reference value v81 with the voltage v
1, and when v1≦v81, pa1”, v,>■8
When it is 1, it outputs a signal S14 which becomes "'D"-.

Further, the comparator 42 outputs the second reference value ■S2 and the above voltage ■
1 and ■When 1≦Vs2, °゛1″, v,>■
When this happens, a signal S14 which becomes "o" is output.

2. If the above first reference value Vs is set to a value corresponding to, for example, 0°C, and the second reference value s2 is set to a value corresponding to, for example, 15°C, the signal S14 will be set when the outside temperature is 0°C or higher. “′1
", and the signal S15 is when the outside temperature is 15℃ or higher."
It becomes 1''.

On the other hand, the changeover switch 46 is a switch that operates in conjunction with the airflow rate changeover switch of the vehicle heating system, and has contacts H, M, L,
OFF corresponds to high speed, medium speed, low speed, and stop of the blower fan, respectively.

When the changeover switch 46 is connected to the contact H or M, one end of the resistor R6 or R7 is grounded. Therefore, the outputs of the two inverters 47 and 48 are "1" and the other is "0", and the signal S16 of the NOR circuit 45 is "
becomes 0''.

Further, when the changeover switch 46 is connected to the contact point or OFF, the outputs of the inverters 47 and 48 are both °'
Therefore, the signal 516u"1 of the NOR circuit 45
"become.

Therefore, the signal S16 is "0" when the blower fan is operating at high or medium speed, and is ``0'' when the blower fan is operating at low speed or is stopped.
Become I.

The above signal S16 and the signal S14 of the comparator 41 are applied to an AND circuit 46.

Therefore, the signal S17 of the AND circuit 46 becomes 1'' only when the outside air temperature is 0° C. or higher and the blower fan is at the low speed position or the stop position.

The above signal S17 and the signal S15 of the comparator 42 are sent to an OR circuit 44, and the output of this OR circuit 44 is the temperature determination signal S. becomes.

Therefore, the temperature determination signal S. is always "'0" when the outside temperature is less than 0℃, and is 15 when the outside temperature is 0℃ or higher.
If the temperature is less than ℃, the temperature will be °1" when the fan is at low speed or stop position, and 0" when it is at medium speed or high speed.
When the outside temperature is 15°C or higher, it is always °'1".

Temperature judgment signal S. changes as described above, the apparatus of FIG. 1 operates as follows.

First, in cold weather when the outside air temperature is less than 0°C, the temperature determination signal S is used. is always set to "o", so the engine will not automatically stop even if other stop conditions are satisfied. Therefore, the heating device can be fully utilized.

Next, when the outside air temperature is 0° C. or more and less than 15° C., the automatic engine stop mechanism is activated only when the blower fan is operating at a low speed with low power consumption or is stopped. Therefore, there is no risk of the battery dying,
Additionally, depending on the conditions, an automatic shut-off mechanism is also activated, which improves fuel efficiency.

Next, when the outside air temperature is 15 degrees Celsius or higher and there is little possibility that the heating system's ventilation fan will be used, the automatic shut-off mechanism will always operate, so its original performance will be fully utilized.

Note that the values of the above-mentioned set temperatures of 0° C. and 15° C. can be set to arbitrary values by changing the values of variable resistors R3 and R5 in FIG. 4.

Although not shown in FIG. 1, when the ignition switch is turned off, the power to the ignition device is cut off and the engine is stopped, as in a normal automobile engine.

Further, in the embodiment shown in FIG. 1, the present invention is applied to a device that stops the engine when the stopping condition of applying the parking brake is satisfied, but other methods, such as when the car is stopped or when the engine is stopped, are applied. Of course, the present invention can also be applied to devices that have a stop condition of a switch operation by a person.

In the embodiment shown in FIG. 1, the present invention is constructed using ordinary hardware, but it goes without saying that similar control can be performed using a microconverter, for example. When applied to an automobile equipped with a central engine control device using a microcombinator, the present invention can be realized by simply changing the program of the microcombinator.

As explained above, according to the present invention, when the temperature is cold, priority is given to the heating device, when the temperature is in the middle, the automatic stop mechanism is activated or stopped depending on the operating state of the ventilation fan, and when the temperature is warm, when there is little need for the heating device, the automatic stop mechanism is activated or stopped. The automatic stop mechanism is configured to always operate. Therefore, there is no risk of the battery dying, which would otherwise impair heating performance.
This also has the effect of improving fuel efficiency.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a signal waveform diagram of the circuit of FIG. This is an example diagram. Explanation of symbols 1 to 4...One-shot multivibrator 5...
Temperature judgment circuit 6-8... OR circuit 9-10...
・Flip-flop 11.12...AND circuit 16...Comparator 14...Inverter 40...
...Temperature sensing element 41.42...Comparator 43...
・AND circuit 44...OR circuit 45...NOR circuit 46...changeover switch 47.48...
Inverter So...Temperature judgment signal Sl...Parking brake signal S2...Ignition switch signal S3...Release signal S4...Starter signal S...Rotation speed signal S12...Starter drive signal Sl ...Fuerukanoto Signal Agent Patent Attorney Junnosuke Nakamura 5IP3 Figure 4F4 Figure

Claims (1)

[Claims] In an engine control device that automatically stops the engine when a predetermined stopping condition is satisfied and automatically starts the engine when a predetermined starting condition is satisfied, the engine control device includes means for detecting outside air temperature. , when the outside air temperature is cold and is less than the first predetermined temperature, the automatic stop mechanism is not operated, and the outside air temperature is at least the first predetermined temperature and a second predetermined temperature higher than the first predetermined temperature. If the temperature is lower than the second predetermined temperature, the above-mentioned automatic stop mechanism will be activated only when the ventilation fan of the heating device is stopped or operating at low speed, and when the outside temperature is warmer than the above-mentioned second predetermined temperature, the above-mentioned automatic stop mechanism will be activated. An engine control device equipped with means for constantly operating a stop mechanism.