JPH0549496B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic control unit for a vehicle, and in particular, it controls a self-energizing means to turn on based on a key-on signal from a key switch to self-maintain energization when the key switch is turned off. The present invention relates to an electronic control unit for a vehicle that has the function of

[Description of Prior Art] As one of the prior art related to the present invention, there is a control device for a mechanical automatic transmission described in Japanese Utility Model Application Publication No. 61-54927. This is configured so that when the key switch is off and the vehicle speed and engine speed are zero, the clutch is connected and then the relay is turned off to cut off the power supply to the control device.

However, in such conventional technology, turning off the key switch is one of the requirements for self-energization termination, so if the key-on signal given when the key switch is closed continues to be input due to an abnormality in the key switch circuit, etc. There was a problem in that the power supply to the control device continued, causing problems such as battery rise.

[Object of the invention] The present invention has been made based on the above viewpoints, and
The purpose is to provide an electronic control unit for a vehicle that can prevent problems such as battery exhaustion.

[Means for achieving the object] In the present invention, the self-energizing means is turned on based on a key-on signal given when the key switch is in the on position and the starter position,
In a vehicle electronic control unit that self-maintains energization when the key switch is off, a starter signal given while the key switch is in the starter position and the key-on signal are input, and when only the starter signal is given, the key-on signal is input. means for detecting an abnormality in the key-on signal and turning on the self-energizing means upon detection of the abnormality in the key-on signal;
means for detecting an idle state in which the vehicle is stopped and no control signal is output to an external device controlled by the vehicle electronic control unit as a self-energization end state regardless of whether the key switch is turned off; The above object is achieved by a vehicle electronic control unit having means for controlling the self-energization means to turn off when the self-energization termination state continues for a predetermined period of time.

In other words, since the self-energization end state is detected regardless of whether the key switch is turned off, the self-energization end state will continue for a predetermined period of time even if the key-on signal given when the key switch is closed continues to be input due to an abnormality in the key switch circuit. As a result, the self-energizing means is controlled to be turned off, and adverse effects such as battery rise are prevented.

[Embodiment of the Invention] FIG. 1 is a configuration diagram showing an embodiment of the present invention.

In the figure, 1 is a battery whose negative side is grounded, and an on-position switch 2 of a key switch KS, a power switch 3, a starter switch 4, and a self-energizing relay 5 are provided in parallel on the positive side of the battery 1. The on position switch 2 is connected to the battery 1 and the electronic control unit 6.
When the key-on signal input terminal a of the electronic control unit 6 is closed, an H-level key-on signal is applied to the key-on signal input terminal a of the electronic control unit 6. The on position switch 2 is in the closed state when the key switch KS is operated to the on position and the starter position. The power switch 3 is inserted between the battery 1 and the power terminal b of the electronic control unit 6, and when it is closed, the electronic control unit 6 is turned off.
Power is now being supplied to the For power switch 3, key switch KS is in accessory position,
It is in the closed state when it is operated to the on position and the starter position. Starter switch 4 is
It is inserted between the battery 1 and the starter signal input terminal c of the electronic control unit 6, and when it is closed, a starter (not shown) is driven and the starter signal input terminal c of the electronic control unit 6 is connected to the starter signal input terminal c of the electronic control unit 6. It's starting to give a signal. Starter switch 4 operates when key switch KS is operated to the starter position.
It becomes a closed state. The self-energizing relay 5 has its excitation coil 5a inserted between the battery 1 and the self-energizing control terminal d of the electronic control unit 6,
The normally open contact 5b is inserted between the battery 1 and the power terminal b of the electronic control unit 6 so as to bypass the power switch 3.

In the electronic control unit 6, 7 is
In the AND circuit, one input terminal is connected to the key-on signal input terminal a via the inverter 8, the other input terminal is connected to the starter signal input terminal c, and its output is connected to the first switching circuit 9 and the counter 10. is given to. The first switching circuit 9 is
Using the output of AND circuit 7 as a switching control signal, AND
A clock is applied to the counter 10 while the output of the circuit 7 is at H level. The counter 10 enters a reset state when the AND circuit 7 outputs an L level, and is released from the reset state when the output of the AND circuit 7 becomes an H level.The counter 10 counts the clocks supplied via the first switching circuit 9 and resets the counter 10. The count value is given to the failure detection circuit 11. The failure detection circuit 11 detects a second failure when the count value of the counter 10 reaches a predetermined value.
An H level output is given to the switching circuit 12, and an L level output is given when the count value does not reach a predetermined value. The second switching circuit 12 has one selection contact 12a.
is connected to the key-on signal input terminal a, and the other selection contact 12b is set to H regardless of the on-position switch 2.
It is maintained at a level condition. Second switching circuit 12
uses the output of the failure detection circuit 11 as a switching control signal, selects one selection contact 12a with the L level output of the failure detection circuit 11, gives a key-on signal to the relay control circuit 13, and switches the H level output of the failure detection circuit 11 to the relay control circuit 13. selects the other selection contact 12b and provides an H level signal to the relay control circuit 13. The relay control circuit 13 receives the signal selected by the second switching circuit 12 as well as the output of the NAND circuit 14 and the clock. The NAND circuit 14 receives the output of the zero rotation speed detection circuit 15, the output of the zero vehicle speed detection circuit 16, the output of the clutch on detection circuit 17, the transmission control display signal of the transmission drive section 18, and the output of the clutch drive section 19. A clutch control display signal and a starter signal via an inverter 20 are input. The zero rotational speed detection circuit 15 inputs an engine rotational speed signal from the rotational speed sensor 21 that detects the engine rotational speed, and when the engine rotational speed is zero, gives an H level rotational speed zero signal, and detects the engine rotational speed. In a state where is not zero, an L level output is given. The vehicle speed zero detection circuit 16 includes a vehicle speed sensor 22 that detects the speed of the vehicle.
When the vehicle speed is zero, an H level vehicle speed zero signal is given, and when the vehicle speed is not zero, an L level output is given. The clutch on detection circuit 17 inputs a clutch position signal from a clutch sensor 23 that detects the position of a friction clutch 27, which will be described later, and gives an H level clutch on signal when the friction clutch 27 is completely connected. When not connected, it gives an L level output. The transmission drive section 18 operates the gear transmission 25 by driving the transmission actuator 24 in accordance with a transmission control signal, and when the transmission actuator 24 is not being driven, that is, the transmission actuator 24 receives a drive signal. If the vehicle is not being outputted, a transmission control display signal of H level is given, and if the vehicle is being driven, a transmission control display signal of L level is given. The clutch drive unit 19 operates the friction clutch 27 by driving the clutch actuator 26 in response to a clutch control signal, and when the clutch actuator 26 is not being driven, that is, the clutch actuator 26 receives a drive signal. When the clutch is not being outputted, an H level clutch control display signal is given, and when the clutch is being driven, an L level clutch control display signal is given. The NAND circuit 14 determines that the engine speed is zero, the vehicle speed is zero, the friction clutch 27 is fully engaged, the gear transmission 25 and the friction clutch 27 are not in operation, and the starter signal is not present. When a self-energization end state that satisfies all of the conditions not given is established, an L level output is given, and otherwise an H level output is given. In the self-energization termination state in which the NAND circuit 14 provides an L level output, the electronic control unit 6 controls the transmission actuator 24,
In an idle state in which no control signal is output to external devices such as the clutch actuator 26, and
The vehicle and engine are stopped. When the relay control circuit 13 receives an H level signal from the second switching circuit 12, the self-energization control terminal d
is set to the ground level, and after the output of the NAND circuit 14 is inverted from H level to L level,
It has a function of setting the self-energization control terminal d to a high impedance state when the L level output state of the NAND circuit 14 continues for a predetermined period of time.

In the above configuration, assuming that the key-on signal given from the key switch KS is normal, when the on-position switch 2 is closed, the power switch 3 linked to this is also closed, and the electronic control unit 6 is When power is applied, H
A level key-on signal is given to the electronic control unit 6, and in this state, the starter switch 4
By closing, an H level starter signal is given to the electronic control unit 6.
Therefore, the output of AND circuit 7 is constant at L level,
The first switching circuit 9 and the counter 10 do not operate,
Therefore, the failure detection circuit 11 provides an L level output to the second switching circuit 12. The second switching circuit 12 selects one selection contact 12a, a key-on signal is given to the relay control circuit 13, and the self-energizing relay 5 is energized. As a result, the normally open contact 5b closes, and the energizing circuit passing through the power switch 3 and the normally open contact 5b close.
An energizing circuit passing through b is formed. The NAND circuit 14 provides an H level output to the relay control circuit 13 in order to turn off the friction clutch 27 by applying power, and when the starter switch 4 is closed, a starter signal is provided and the engine starts to rotate. Since the vehicle enters the operating state, the H level output is maintained. When the on-position switch 2 is opened to turn off the engine while the vehicle is stopped, the power switch 3 is simultaneously opened and no key-on signal is given to the electronic control unit 6. Power is supplied to the electronic control unit 6 via a normally open contact 5b.
The engine speed is zero, the vehicle speed is zero, the friction clutch 27 is fully engaged, the gear transmission 25 and the friction clutch 27 are not in operation, and the starter signal is not applied. The output of the NAND circuit 14 becomes L due to the self-energization termination state that satisfies all of the above conditions.
level. The relay control circuit 13 is a NAND
When the L level output state of the circuit 14 continues for a predetermined period of time, the self-energization control terminal d is brought into a high impedance state. As a result, the self-energizing relay 5 is deenergized, the normally open contact 5b is opened, and the power supply to the electronic control unit 6 is cut off.

If the key-on signal continues to be input due to an abnormality in the key switch KS, even if the key-on signal is given by closing the on-position switch 2, if the starter signal is not given, the engine speed will be zero. The self-energization termination state is established when the vehicle speed is zero, the friction clutch 27 is fully engaged, and the gear transmission 25 and friction clutch 27 are not in operation. , the output of the NAND circuit 14 becomes L level. When this state continues for a predetermined period of time, the relay control circuit 13 puts the self-energizing control terminal d into a high impedance state, so the self-energizing relay 5 is de-energized and the electronic control unit 6 is de-energized. .

Even if the on-position switch 2 is closed due to an abnormality in the key-on signal given from the key switch KS due to a disconnection, etc., the electronic control unit 6
If no key-on signal is given to the electronic control unit 6, a starter signal will be given to the electronic control unit 6 by closing the starter switch 4 under this condition. Therefore, the output of AND circuit 7 is H.
level, and at the same time as the first switching circuit 9 is closed, the reset state of the counter 10 is released and the count value is given to the failure detection circuit 11. The failure detection circuit 11 provides an H level output to the second switching circuit 12 when the count value of the counter 10 reaches a predetermined value. As a result, the second switching circuit 12 selects the other selection contact 12b, and an H level signal is given to the relay control circuit 13. Other operations are as described above.

FIG. 2 is a configuration diagram showing another embodiment of the present invention, and FIGS. 3A and 3B are control flowcharts for the configuration shown in FIG. This figure shows a case in which the self-energizing relay 5 is controlled by the self-energizing relay 5, and the same reference numerals as in FIG. 1 represent the same parts. Note that the terminals w, x, y, and z in FIG. 3A are connected to terminals with the same symbols in FIG. 3B. Hereinafter, the operation of the configuration shown in FIG. 2 will be explained using FIGS. 3A and 3B together.

Assuming that the key-on signal given from the key switch KS is normal, power is applied to the electronic control unit 30 when the power switch 3 is closed, and after initialization it enters step 40 to determine whether or not there is a key-on signal. Go to step 41 via w. Steps 41, 42, 43, 44, 45, 46
So, is the engine speed zero, the vehicle speed zero, or is the friction clutch 27 in the connected state, that is, the clutch is on?
It is determined whether the gear transmission 25 is being controlled, the friction clutch 27 is being controlled, and the presence or absence of the starter signal. The determination of whether the engine rotational speed is zero, the vehicle speed is zero, and the clutch is on are performed based on the engine rotational speed signal from the rotational speed sensor 21, the vehicle speed signal from the vehicle speed sensor 22, and the clutch position signal from the clutch sensor 23, respectively. Therefore, the judgment as to whether or not the gear transmission 25 and the friction clutch 27 are being controlled is as follows.
This is done based on whether or not a drive signal is output to the transmission actuator 24 and clutch actuator 26, respectively. When the engine speed and vehicle speed are zero, the friction clutch 27 is fully connected, and the gear transmission 25 and the friction clutch 2
7 is not controlled and the self-energization termination condition where no starter signal is given is satisfied, then
Steps 41 to 46 are passed and step 47 is entered. However, when power is applied, the friction clutch 27 is turned off, etc., and when the starter switch 4 is closed, a starter signal is given and the engine rotates. The program then enters step 48, in which the internal timer is reset and the flag _F2 is set to "0" in step 49. Thereafter, the process enters step 50 via terminal y, and sets the self-energization control terminal d to the ground level. As a result, the self-energizing relay 5 is energized, and an energizing circuit passing through the normally open contact 5b is formed. After step 50, step 51 determines whether or not there is a key-on signal, and if there is a key-on signal, the process returns to step 40 via normal control in step 52. As long as the key-on signal is normal and the key-on signal is provided by closing the on-position switch 2, the above-described operation is repeated. When the on-position switch 2 is opened to turn off the engine while the vehicle is stopped, the power switch 3 is simultaneously opened and no key-on signal is given to the electronic control unit 30. Power is supplied to the electronic control unit 30 via the normally open contact 5b. When the key-on signal is no longer given, the process proceeds from step 40 to step 53 to determine the failure flag _FF . Since the failure flag F _F is set to "0" during initialization, steps 53 to 54 are performed.
The presence or absence of the starter signal is determined. Since no starter signal is applied when the ON position switch 2 is open, steps 54 to 55 are performed.
Step 51 is entered after the internal timer is reset and the flag _F1 is set to "0" in step 56.
Since ON position switch 2 is open, step
From step 51, the process proceeds to step 57 to determine the flag _F1 , and then to step 58 to determine whether the control ends when the key is off. In step 58, in the determination to end the key-off control, after the on-position switch 2 is opened and no key-on signal is given, predetermined controls such as off control of the friction clutch 27 and neutral control of the gear transmission 25 are performed. It is determined whether or not the process has been completed, and if it has not been completed, the process returns to step 40 via step 52, and if it has completed, the process proceeds to step 59 via terminal z. When the predetermined control at the time of key-off is completed and step 59 is entered, the self-energization control terminal d is brought into a high impedance state. As a result, the self-energizing relay 5 is de-energized, the normally open contact 5b is opened, and the electronic control unit 30
The power supply is cut off.

An abnormality occurs in the key-on signal due to a disconnection, etc.
If an H level key-on signal is not given to the electronic control unit 30 even if the on-position switch 2 is closed, the process proceeds from step 40 through step 53 to step 54 after initialization. If the starter signal is not applied, the steps proceed from step 54 to step 55 → step 56 → step 51 → step
57→Step 58→Step 52 and return to Step 40. When the starter signal is applied, the program enters step 60 from step 54, and the flag _F1 is determined. Since the flag _F1 is set to "0" during initialization, the program enters step 61 from step 60, starts the internal timer, and starts the next step 62.
After the flag _F1 is set to "1" in step 63, time-up determination is performed. If the predetermined time _t1 has not elapsed while the starter signal is being applied, the process proceeds from step 63 to step 51 → step 57.
→ Return to step 40 via step 52. Predetermined time
When _t1 has elapsed, the program enters step 64 from step 63, where the failure flag _FF is set to "1", and then step 50 is entered where the self-energization control terminal d is set to the ground level. As a result, a current-carrying circuit passing through the normally open contact 5b is formed as described above.
After step 50, the process returns to step 40 via step 51, step 57, and step 52, and then enters step 53, where the failure flag _FF is determined. Since the flag F _F was set to "1" in step 64, the step
From 53, go to step 41 via terminal w, and go to step 41.
41 to 46, the engine speed and vehicle speed are determined to be zero, the clutch is engaged, the gear transmission 25 and the friction clutch 27 are controlled, and the presence or absence of the starter signal is determined. A self-energizing termination condition must be satisfied when the engine speed and vehicle speed are zero, the friction clutch 27 is fully engaged, the gear transmission 25 and the friction clutch 27 are not controlled, and the starter signal is not applied. For example, step 48 is entered from any one of steps 41 to 46, and after processing steps 48 and 49, terminal y is
After that, return to step 50. The above-mentioned operation is repeated until the self-energization end condition is not satisfied. When the ON position switch 2 is opened to turn off the engine while the vehicle is stopped and the self-energization termination condition is satisfied, the process passes through steps 41 to 46 and returns to step 47.
Enter the flag F ₂ judgment. In this case, the step 47 is entered with the flag F ₂ in the state of "0", so the program enters the step 65 from the step 47 to start the internal timer, and in the next step 66 the flag F ₂ is set to "1".
After the processing is completed, time-up judgment is performed in step 67. If the self-energization end state is satisfied and the predetermined time _t2 has not elapsed, the step
From 67, the process returns to step 51 via terminal x. Predetermined time
When _t2 has elapsed, the program enters step 59 from step 67, and puts the self-energization control terminal d into a high impedance state. As a result, the power supply to the electronic control unit 30 is cut off.

If the key-on signal continues to be input due to an abnormality in the key switch KS, the terminal w is input from step 40.
The process then proceeds to step 41, and when the self-energization completion conditions of steps 41 to 46 are satisfied, the process proceeds to step 47. Even if the key-on signal is given by closing the on-position switch 2, if the starter signal is not given, it means that the engine speed is zero, the vehicle speed is zero, and the friction clutch 27 is not fully engaged. and gear transmission 2
5 and that the friction clutch 27 is not being driven, a self-energization termination state is established. Then, as described above, when the self-energization termination state continues for a predetermined time _t2 , the step is completed.
59, and the self-energizing relay 5 is turned off.

[Effects of the Invention] As explained above, according to the present invention, an idle state in which the vehicle is stopped and no control signal is output to an external device is detected as a self-energization end state regardless of whether the key switch is turned off. Since the self-energizing means is configured to be released when this state continues for a predetermined period of time, even if the key-on signal given when the key switch is closed continues to be inputted due to an abnormality in the key switch circuit, the self-energizing termination state remains unchanged. By continuing for a certain period of time, the self-energizing means is controlled to be turned off, and it is possible to prevent harmful effects such as battery rise. Further, since the self-energizing means can be turned on even when a key-on signal is not given when the key switch is turned on, necessary control can be performed after the key switch is turned off.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure is a configuration diagram showing another embodiment of the present invention, FIG. 3A
3B is a control flowchart of the configuration shown in FIG. 2. KS...key switch, 2...on position switch, 3...power switch, 4...starter switch, 5...self-energizing relay, 6, 30...electronic control unit, 13...relay control circuit,
14... NAND circuit, 15... Zero rotation speed detection circuit, 16... Zero vehicle speed detection circuit, 17... Clutch on detection circuit, 18... Transmission drive section, 19...
Clutch drive unit, 21... Rotation speed sensor, 22...
...Vehicle speed sensor, 23...Clutch sensor, 24...
...Transmission actuator, 26...Clutch actuator, 31...Microcomputer.

Claims (1)

[Scope of Claims] 1. An electronic control unit for a vehicle that turns on a self-energizing means based on a key-on signal given when the key switch is in the on position and the starter position, and self-maintains the energization when the key switch is off, comprising: A starter signal given while the key switch is in the starter position and the key-on signal are input, and when only the starter signal is given, an abnormality in the key-on signal is detected, and upon detection of an abnormality in the key-on signal, the self-energization is performed. means for turning the key switch on; and an idle state in which the vehicle is stopped and no control signal is output to an external device controlled by the vehicle electronic control unit, and a self-energization termination state regardless of whether the key switch is turned off. 1. An electronic control unit for a vehicle, comprising: means for detecting that the self-energizing means is turned off when the self-energizing end state continues for a predetermined period of time. 2. The means for detecting the self-energization end state is configured to detect when the vehicle speed and engine speed are zero, the clutch is engaged, the clutch and transmission are not controlled, and the starter is not driven; The electronic control unit for a vehicle according to claim 1, which detects the self-energization end state.