JP2024042886A - Vehicle control device - Google Patents

Abstract

[Problem] To provide a vehicle control device that can reduce power consumption while performing refueling processing when a refueling worker operates a refueling switch with the intention of refueling. [Solution] In one aspect, the vehicle control device of the present invention has a low-pass filter circuit that receives as an input an operation signal of a refueling switch of a vehicle, a holding circuit that holds the operation signal that has passed through the low-pass filter circuit on and makes its output high, and resets the output to low based on a reset signal, a control unit that performs refueling processing when refueling a fuel tank of the vehicle, the control unit obtaining the operation signal of the refueling switch that has bypassed the low-pass filter circuit and the holding circuit, and outputting the reset signal to the holding circuit, and a power supply unit that turns on and off the power supply from a power source to the control unit, and supplies power to the control unit when the output of the holding circuit is high. [Selected Figure] Figure 1

Description

The present invention relates to a vehicle control device.

The fuel tank lid opener control device disclosed in Patent Document 1 measures the duration of the refueling signal when the lid opening switch is operated by the driver during refueling and outputs the refueling signal, and determines that the duration is a first predetermined duration. Only when the time is longer than the second predetermined time and shorter than the second predetermined time, the vent valve is opened to exhaust the evaporated fuel in the fuel tank into the canister to lower the tank internal pressure, and the lid opener is activated to open the fuel filler lid. Open.

Japanese Patent Application Publication No. 2003-002399

By the way, a vehicle control device including a microcomputer performs refueling processing such as exhausting evaporated fuel in a fuel tank into a canister only when a refueling worker operates a refueling switch with the intention of refueling. Therefore, when determining the duration of the refueling signal by software processing, it is necessary to supply power to the microcomputer in order to operate the software.
However, in order for the microcomputer to use software processing to determine that the refueling switch has been operated incorrectly or that the refueling signal has been turned on due to noise, the microcomputer must be activated in advance. The problem was that it consumed unnecessary power.

The present invention has been made in view of the conventional circumstances, and its purpose is to reduce power consumption while allowing processing to be performed during refueling when a refueling worker operates the refueling switch with the intention of refueling. The objective is to provide a vehicle control device that can.

In one aspect, the vehicle control device according to the present invention includes a low-pass filter circuit that receives an operation signal of a refueling switch of a vehicle as an input signal, and outputs the operation signal after passing through the low-pass filter circuit. a holding circuit whose output is set to high and whose output is reset to low based on a reset signal; and a control unit that performs refueling processing when refueling a fuel tank of the vehicle, the low-pass filter circuit and the holding circuit the control section that acquires the operation signal of the refueling switch bypassing the refueling switch and outputs the reset signal to the holding circuit; and the power supply section that turns on and off power supply from a power source to the control section, the control section that outputs the reset signal to the holding circuit; and the power supply section that supplies power to the control section when the output of the circuit is high.

According to the present invention, when a refueling worker operates a refueling switch with the intention of refueling, the refueling process can be performed and power consumption can be reduced.

FIG. 1 is a configuration diagram of a vehicle fuel tank system. 5 is a time chart showing the correlation between the on/off of a fuel supply switch, the output of a low-pass filter, and the output signal of a holding circuit. FIG. 2 is a transition diagram showing transition of operation modes of a microcomputer. FIG. 3 is a diagram showing the correlation between the on-time of a refueling switch and the transition of an operating mode. 4 is a flowchart showing a flow of an initialization process of a microcomputer. 3 is a flowchart showing the flow of scheduled task processing by a microcomputer. 5 is a time chart illustrating diagnosis of a low-pass filter being stuck in the OFF state. 5 is a time chart showing diagnosis of a non-resettable state of a holding circuit.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a vehicle control device according to the present invention will be described based on the drawings.
FIG. 1 is a configuration diagram of a fuel tank system including a vehicle control device according to the present invention.

A fuel tank system 1 mounted on a vehicle is a system that supplies fuel in a fuel tank 10 to an internal combustion engine 20 that is the power source of the vehicle.
The fuel tank system 1 has a device for suppressing the release of fuel evaporative gas when the fuel tank 10 is filled with fuel, as will be described later.

The fuel pump 30 pumps the fuel stored in the fuel tank 10 to the fuel injection device 21, and the fuel injection device 21 supplies the fuel to the combustion chamber of the internal combustion engine 20.
The fuel tank 10 has a filler duct 11 and a vent pipe 12.

A filler cap 13 is removably attached to a fuel filler port 11A at the tip of the filler duct 11.
A fuel filler opening 41 provided in an outer body panel 40 is opened and closed by a filler lid 42 , and the tip of the filler duct 11 is disposed at the bottom of the fuel filler opening 41 .
The filler lid 42 is driven to open and close by an opening and closing drive unit 43 such as a motor.

The vapor recovery pipe 14 communicates the upper space within the fuel tank 10 and the canister 18 .
Arranged in the vapor recovery pipe 14 are, in order from the fuel tank 10 side, a solenoid valve 16 for opening and closing the vapor recovery pipe 14, a compressor 17 for sending fuel evaporative gas into a canister 18, and a canister 18 for adsorbing fuel evaporative gas. be.

The vapor recovery pipe 14, electromagnetic valve 16, compressor 17, and canister 18 constitute a fuel evaporation suppression device for suppressing the release of fuel evaporative gas from the fuel filler port 11A when refueling the fuel tank 10.
Note that the fuel evaporation suppression device can be a device that includes a reservoir together with the canister 18, as disclosed in Japanese Patent Application Laid-Open No. 8-121280.

The control device 50 of the fuel tank system 1 is a vehicle control device having a microcomputer 51 which is a calculation device.
The microcomputer 51 includes a CPU (Central Processing Unit), a ROM (Read only memory), which is a non-volatile memory that stores processing programs, etc., a RAM (Random access memory), which is a volatile memory that temporarily stores data, and input/output ports.

The microcomputer 51 is a control unit that includes a control function as software for suppressing the release of fuel evaporative gas during refueling.
That is, prior to refueling the fuel tank 10, the microcomputer 51 controls to open the solenoid valve 16 and then operate the compressor 17 to send the evaporated fuel gas in the fuel tank 10 to the canister 18. Control for opening the filler lid 42 by the opening/closing drive unit 43 is performed as a refueling process.

By controlling the opening of the filler lid 42 by the microcomputer 51, the fuel filler port 11A of the fuel tank 10 can be opened.
Therefore, the refueling operator manually removes the filler cap 13 to open the refueling port 11A, and then inserts a refueling gun into the refueling port 11A to refuel the fuel tank 10.
Here, since the fuel evaporative gas in the fuel tank 10 is collected in the canister 18 before the fuel filler port 11A is opened, when the refueling operator removes the filler cap 13 and opens the fuel filler port 11A, the fuel filler port 11A This can prevent fuel evaporative gas from being released into the atmosphere.

The control device 50 is supplied with power from a battery 60 that is a power source.
The control device 50 also acquires an operation signal of a refueling switch 61 provided near the driver's seat of the vehicle, an on/off signal of an ignition switch (IGNSW) 62 for switching on/off of the internal combustion engine 20, and the like.
The refueling switch 61 is a press switch that is turned on during a pressing operation, automatically returns to OFF when the pressing operation is stopped, and maintains the off state.

The control device 50 includes a microcomputer 51 , a power supply unit 52 , and an operation signal input circuit 53 .
The power supply unit 52 includes a power relay 52A and a power IC 52B, and turns on and off the power supply from the battery 60 to the microcomputer 51 .

The power supply IC 52B is a circuit that generates a power supply voltage for the microcomputer 51 from the power supply voltage of the battery 60 and supplies power to the microcomputer 51.
The power supply relay 52A is provided between the battery 60 and the power supply IC 52B, and turns on/off the power supply from the battery 60 to the power supply IC 52B, in other words, the power supply to the microcomputer 51.

The operation signal input circuit 53 includes a low-pass filter circuit 53A that receives the operation signal OS of the refueling switch 61 as an input signal, and a holding circuit 53B.
The low-pass filter circuit 53A is, for example, a first-order low-pass filter consisting of a capacitor connected in parallel with the input signal and a resistor connected in series with the input signal.
The holding circuit 53B is, for example, a flip-flop circuit, holds the operation signal OS that has passed through the low-pass filter circuit 53A, and sets the output signal HS to high, and changes the output signal HS based on the reset signal RS output from the microcomputer 51. is reset low.

The microcomputer 51 acquires the on/off signal IS of the ignition switch 62, the output signal HS of the holding circuit 53B, and the operation signal OS of the refueling switch 61 bypassing the operation signal input circuit 53.
Furthermore, the microcomputer 51 outputs a power hold signal SS to the power relay 52A, instructing the continuation of power supply.

The power relay 52A turns on when any one of the on/off signal IS of the ignition switch 62, the output signal HS of the holding circuit 53B, and the power holding signal SS output from the microcomputer 51 is at a high level, and receives power from the battery 60. Power is supplied to IC52B.
The power supply IC 52B is supplied with power from the battery 60, generates a power supply voltage for the microcomputer 51, and supplies power to the microcomputer 51.

In other words, the power supply relay 52A is turned on and off in response to the logical sum of the on/off signal IS of the ignition switch 62, the output signal HS of the holding circuit 53B, and the power supply holding signal SS output by the microcomputer 51, thereby controlling the power supply to the microcomputer 51.
That is, the power supply unit 52 is configured to supply power to the microcomputer 51 when the output signal HS of the holding circuit 53B is high.

In the fuel tank system 1 having such a configuration, when a refueling operator turns on the refueling switch 61 prior to refueling, the output signal HS of the holding circuit 53B is switched on in response to the on operation, thereby turning on the power relay 52A. do.
When the power supply relay 52A is turned on, power is supplied from the power supply IC 52B to the microcomputer 51, and the microcomputer 51 is activated.
Then, the activated microcomputer 51 performs the above-described refueling process and collects fuel evaporative gas before refueling starts.

In addition, the signal that turns on the power relay 52A may include a periodic wake-up signal that is periodically transmitted from other electronic control devices that can communicate with each other via the in-vehicle communication network, or a diagnostic wake-up signal that is output by the wake-up circuit when a predetermined time has elapsed since the internal combustion engine 20 was stopped.
Here, when the microcomputer 51 is started up based on the diagnosis wake-up signal, it performs a leak diagnosis of the canister purge system, etc.

The control device 50 prevents the refueling process, which includes the process of sending fuel evaporative gas into the canister 18 and the process of opening the filler lid 42, from being erroneously performed when the refueling switch 61 is operated incorrectly or malfunctions. Furthermore, such malfunctions can be suppressed while suppressing the power consumption of the microcomputer 51.
The control device 50 includes a low-pass filter circuit 53A to prevent malfunctions and reduce power consumption.

FIG. 2 is a time chart for explaining the operation of the low-pass filter circuit 53A.
The low-pass filter circuit 53A, which receives the operation signal OS of the refueling switch 61 as an input signal, changes its output signal with a delay with respect to the operation signal OS when the operation signal OS of the refueling switch 61 is switched from off to on.

The output signal of the low-pass filter circuit 53A is delayed by a time T1 [s] (T1> 0), the threshold value is reached and the output of the holding circuit 53B switches to high.
In other words, the low-pass filter circuit 53A detects the timing at which the output signal HS of the holding circuit 53B switches to high (in other words, the timing when the output signal HS of the holding circuit 53B switches to high) by the delay time T1 from the time when the operation signal OS of the refueling switch 61 switches from off to on. (timing to start supplying power to).

If the operation signal OS of the refueling switch 61 returns from on to off during a period from time T0 when the operation signal OS of the refueling switch 61 switches from off to on until a delay time T1 elapses, the low-pass filter circuit 53A The output does not reach the threshold value at which the output signal HS of the holding circuit 53B switches to high, and the microcomputer 51 is not supplied with power.
That is, the low-pass filter circuit 53A starts supplying power to the microcomputer 51 and starts the microcomputer 51 when the ON state of the operation signal OS of the refueling switch 61 continues beyond the delay time T1.

Therefore, when the duration of the ON state of the refueling switch 61 is less than the delay time T1, such as when noise is superimposed on the input circuit of the operation signal OS of the control device 50, the low-pass filter circuit 53A functions power supply will not start.
This prevents unnecessary start of power supply to the microcomputer 51 due to superimposition of noise on the input circuit of the operation signal OS, that is, unnecessary startup of the microcomputer 51, and prevents the microcomputer 51 from being powered up. Consumption can be reduced.
Note that the delay time T1 [s], in other words, the time constant of the low-pass filter circuit 53A is adapted to prevent the start of power supply to the microcomputer 51 due to noise.

Further, the microcomputer 51 does not need to measure the duration itself to determine that the time that the operation signal OS of the refueling switch 61 continues to be in the ON state is short enough to estimate noise superposition.
Therefore, the microcomputer 51 does not need to stand by in an operating state (power supply state) in preparation for the operation signal OS of the refueling switch 61 being turned on from off, and the power consumption of the microcomputer 51 can be reduced.

After startup, the microcomputer 51 determines whether or not a refueling worker such as a vehicle driver operates the refueling switch 61 with the intention of refueling, based on the ON time of the operation signal OS of the refueling switch 61. , reduces its own power consumption by transitioning the operation mode according to the determination result.
FIG. 3 is a transition diagram showing how the operating mode of the microcomputer 51 changes in response to the operation of the refueling switch 61, etc., and FIG. 4 is a diagram showing the transition of the operating mode with respect to the on time of the refueling switch 61. .

In FIGS. 3 and 4, time T [s] is the elapsed time after the operation signal OS of the refueling switch 61 is switched from off to on.
Then, since power is supplied to the microcomputer 51 after the delay time T1 has elapsed after the operation signal OS of the refueling switch 61 is switched from off to on, the microcomputer 51 is started up for "time T - delay time T1". This corresponds to the elapsed time since

When the on time of the refueling switch 61 is less than the delay time T1 (including the case where the refueling switch 61 remains off), the microcomputer 51 is not supplied with power from the battery 60 (power IC 53) and is in an operation stopped state (shut down). off state).
Here, when the on-time of the refueling switch 61 exceeds the delay time T1, the output signal HS of the holding circuit 53B becomes high and the power supply relay 52A is turned on, thereby starting the microcomputer 51 and starting power supply.

The activated microcomputer 51 initializes and sets its operating mode to a standby mode that consumes less power than a refueling mode, which will be described later.
Note that when the microcomputer 51 is started, the operation signal of the refueling switch 61 is turned off based on the fact that the operation signal of the refueling switch 61 is on and/or the output signal HS of the holding circuit 53B is high. It is determined that the activation is due to switching to on.

Then, the microcomputer 51 operates for a period during which the time T satisfies delay time T1<time T<judgment time T2 (0<T1<T2), in other words, until the elapsed time from startup reaches T2-T1. In this case, if the operation signal OS of the refueling switch 61 remains on, the standby mode is maintained.
On the other hand, during the period satisfying T1<T<T2, if the operation signal OS of the refueling switch 61 returns to OFF, the microcomputer 51 will continue to operate the If there is no request to transition to the operating mode, the power supply is cut off automatically and the device is shut down.
Note that after startup, the microcomputer 51 maintains the power supply state by outputting a reset signal to the holding circuit 53B with the power holding signal SS raised to high, and in this state, switches the power holding signal SS to low. (In other words, by outputting a signal instructing the power supply relay 52A to stop power supply), self-shutdown is executed.

Here, the determination time T2 (T2>T1>0) is a time corresponding to the shortest on time when the refueling operator operates the refueling switch 61 with the intention of refueling, and is a time corresponding to the shortest on time when the refueling operator intends to refuel. When the refueling switch 61 is operated normally, the time is set such that the ON time of the operation signal OS of the refueling switch 61 does not become shorter.
Note that the determination time T2 is set to, for example, about 0.5 [s].

Therefore, the fact that the operation signal OS of the refueling switch 61 returns to OFF before the determination time T2 has elapsed suggests that the refueling switch 61 has been operated incorrectly.
Therefore, the microcomputer 51 does not perform the refueling process when the operation signal OS of the refueling switch 61 returns to OFF before the determination time T2 has elapsed, and performs self-shutdown after a certain period of time has elapsed.
As a result, even if the microcomputer 51 is activated due to an erroneous operation of the refueling switch 61, the process during refueling is prevented from being executed unnecessarily, and the power supply to the microcomputer 51 is prevented from being continued in vain. Deterred.

In addition, the microcomputer 51 is in a period in which judgment time T2 < time T < judgment time T3 (T2 < T3), that is, the elapsed time from startup exceeds T2 - T1 and reaches T3 - T1. When the operation signal OS of the refueling switch 61 returns from on to off when the fuel supply switch 61 is not in use, the standby mode is transitioned to the refueling mode.
The microcomputer 51 then executes the refueling process in the refueling mode, and transitions from the refueling mode to the standby mode after completing the refueling process.
In other words, the microcomputer 51 changes the operation signal OS of the refueling switch 61 from on to off after a first time has elapsed since the start and before a second time, which is longer than the first time, has elapsed since the start. When this happens, perform the refueling process.

Here, after the microcomputer 51 returns to the standby mode based on the completion of the refueling process, if there is no request for transition to another operation mode for a certain period of time, the microcomputer 51 shuts down.
Note that even in the case of an abnormal termination in which the refueling process cannot be completed in the normal procedure, the microcomputer 51 transitions from the refueling mode to the standby mode in the same way as in the case where the refueling process can be completed normally. After returning, if there is no request for transition to another operation mode for a certain period of time, the device shuts down.

The above judgment time T3 (T3>T2>T1>0) is a time corresponding to the longest on time when the refueling operator operates the refueling switch 61 with the intention of refueling, and is the time when the refueling operator normally operates the refueling switch 61 with the intention of refueling. When operated, the time is set so that the ON time of the operation signal OS will not be exceeded.
Therefore, the fact that the operation signal of the refueling switch 61 is turned off before the determination time T3 has elapsed means that the refueling operator normally operated the refueling switch 61 with the intention of refueling, in other words, the refueling switch 61 This suggests that standard operations were carried out.
Therefore, when the operation signal OS of the refueling switch 61 returns to OFF before the determination time T3 has elapsed, the microcomputer 51 changes to the refueling mode and performs the refueling process.
Note that the determination time T3 is set to, for example, about 3 to 4 [s].

On the other hand, a state in which the operation signal OS of the refueling switch 61 does not return to OFF even after the judgment time T3 has elapsed does not correspond to normal operation of the refueling switch 61 by the refueling worker, and is due to an abnormality such as the refueling switch 61 being stuck on. This suggests the occurrence.
Therefore, if the operation signal OS of the refueling switch 61 does not return to OFF even after the determination time T3 has elapsed, the microcomputer 51 maintains the standby mode without transitioning to the refueling mode and does not execute the refueling process.
Then, the microcomputer 51 shuts down if there is no request for transition to another operation mode for a certain period of time after the determination time T3 has elapsed.

Note that, if the operation signal of the refueling switch 61 is not turned off even after the judgment time T3 has elapsed, the microcomputer 51 requests that the driver be notified of the occurrence of an abnormality in the fuel tank system 1 (refueling control system). A signal, in other words, a signal requesting activation of the abnormality alarm device can be output.
Here, the microcomputer 51 outputs a notification request signal of the occurrence of an abnormality to the meter panel control device communicably connected via the in-vehicle network, and the meter panel control device turns on a warning light based on the notification request signal. It can be configured as follows.

As described above, the microcomputer 51 starts supplying power according to the time T from the time when the operation signal OS of the refueling switch 61 is turned on, and after startup, the microcomputer transitions from a standby mode, which reduces power consumption, to a refueling mode, which performs refueling processing, based on the correlation between the time T and the on/off state of the operation signal OS of the refueling switch 61.
This allows the microcomputer 51 to carry out the refueling process only when the refueling operator operates the refueling switch 61 with the intention of refueling, and also allows the microcomputer 51 to reduce its own power consumption as much as possible.

The flowchart in FIG. 5 shows that power supply to the microcomputer 51 is started by turning on the operation signal of the refueling switch 61, turning on the ignition switch 62, a periodic wake-up signal, or a diagnostic wake-up signal, and the microcomputer 51 is started. The flow of initialization processing is shown below.
In step S101, the microcomputer 51 performs initialization processing for input/output ports with high priority as a first initialization processing.

Next, in step S102, the microcomputer 51 raises the power supply holding signal SS output to the power supply relay 52A to high, so that the power supply relay 52A is held in the ON state.
In addition, in step S103, the microcomputer 51 determines whether the operation signal OS of the fuel supply switch 61 continues to be on or whether another activation factor such as the ignition switch 62 is on.

Here, if the operation signal OS of the refueling switch 61 is off and other activation factors are also off, it can be assumed that the system was started when the operation signal OS of the refueling switch 61 was turned on, but that the turning on of the operation signal OS was due to an erroneous operation of the refueling switch 61.
Therefore, when the operation signal OS of the fuel supply switch 61 is OFF and the other start factors are also OFF, the microcomputer 51 proceeds from step S103 to step S106.

In step S106, the microcomputer 51 outputs a reset signal RS for resetting the output of the holding circuit 53B.
Next, in step S107, the microcomputer 51 switches the power supply holding signal SS to low.
As a result of the processes in steps S106 and S107, the power relay 52A is turned off, the power supply from the battery 60 (power supply IC 53) to the microcomputer 51 is cut off, and the microcomputer 51 is shut off.

On the other hand, if the operation signal OS of the fuel supply switch 61 continues to be on, or if another activation factor such as the ignition switch 62 is on, the microcomputer 51 proceeds from step S103 to step S104.
In step S104, the microcomputer 51 executes, as a second initialization process, an initialization process having a relatively lower priority than the first initialization process executed in step S101.

In the next step S105, similarly to step S103, the microcomputer 51 determines whether the operation signal OS of the fuel supply switch 61 continues to be on or whether another activation factor such as the ignition switch 62 is on.
If the operation signal OS of the fuel supply switch 61 is OFF and other start factors are also OFF, the microcomputer 51 proceeds from step S105 to step S106 and step S107, and automatically shuts off the power supply.

On the other hand, if the operation signal OS of the refueling switch 61 continues to be on, or if another activation factor such as the ignition switch 62 is on, the microcomputer 51 proceeds from step S105 to step S108.
The microcomputer 51 determines whether the ignition switch 62 is on in step S108.

If the ignition switch 62 is on, the microcomputer 51 proceeds to step S109 and sets the operating mode to a driving mode corresponding to control in the driving state of the vehicle.
On the other hand, if the ignition switch 62 is off, the microcomputer 51 proceeds to step S110 and determines whether the diagnostic wake-up signal (startup request by the soak timer) is on.

If the diagnostic wake-up signal (startup request by the soak timer) is on, the microcomputer 51 proceeds to step S111 and sets the operation mode to a leak diagnosis mode in which a leak diagnosis of the canister purge system is performed.
Further, if the diagnostic wake-up signal (startup request by soak timer) is off, the microcomputer 51 proceeds to step S112 and sets the operation mode to standby mode.
In the initialization process after startup, the microcomputer 51 completes the initialization process when the operating mode is set to one of the running mode, leak diagnosis mode, and standby mode, and starts a regular task in step S113.

The flowchart in FIG. 6 shows the flow of periodic task processing after the above-described initialization processing.
Note that the microcomputer 51 executes periodic task processing, for example, at a cycle of 10 ms.
In step S201, the microcomputer 51 determines whether the vehicle speed is 0 km/h or whether the refueling process is being executed.

Then, if the vehicle speed is 0 km/h or if the refueling process is being executed, the microcomputer 51 proceeds to step S202.
In step S202, the microcomputer 51 determines whether the period is within a period in which determination time T2<time T<determination time T3, or whether the refueling process is being executed.

Here, if the microcomputer 51 is within a period in which the judgment time T2<time T<determination time T3 holds, or if the refueling process is being executed, the microcomputer 51 proceeds to step S203.
In step S203, the microcomputer 51 determines whether the operation signal of the refueling switch 61 has changed from on to off, or whether the refueling process is being executed.

Then, the microcomputer 51 determines whether the operation signal OS of the refueling switch 61 changes from on to off within a period in which determination time T2<time T<determination time T3, or when refueling processing is being executed. , proceed to step S204.
In step S204, the microcomputer 51 sets the operation mode to a refueling mode in which refueling processing is performed.

On the other hand, if the microcomputer 51 determines in step S201 that the vehicle speed is not 0 km/h and that the refueling process is not being executed, the process proceeds to step S205.
If the microcomputer 51 determines in step S202 that it is not within the period in which the inequality of determination time T2<time T<determination time T3 holds and that the refueling process is not being executed, the process proceeds to step S205.
Furthermore, if the microcomputer 51 determines in step S203 that the operation signal OS of the refueling switch 61 has not been switched from on to off and that the refueling process is not being executed, the microcomputer 51 proceeds to step S205.

The microcomputer 51 determines whether the ignition switch 62 is on in step S205.
If the ignition switch 62 is on, the microcomputer 51 proceeds to step S206 and sets the operating mode to a driving mode corresponding to the control in the driving state of the vehicle.

On the other hand, if the ignition switch 62 is off, the microcomputer 51 proceeds to step S207.
In step S207, the microcomputer 51 determines whether the diagnostic wake-up signal (soak timer) is on or whether a leakage diagnosis of the canister purge system is being performed.

Then, if the diagnostic wake-up signal is on or if the canister purge system leak diagnosis is being performed, the microcomputer 51 proceeds to step S208.
In step S208, the microcomputer 51 sets the operation mode to a leak diagnosis mode in which a leak diagnosis of the canister purge system is performed.

On the other hand, if the diagnostic wake-up signal is off and the canister purge system leak diagnosis is not in progress, the microcomputer 51 proceeds to step S209.
In step S209, the microcomputer 51 sets the operating mode to a standby mode that reduces power consumption.

After the microcomputer 51 sets the operation mode in any one of step S204, step S206, step S208, and step S209, the process proceeds to step S210.
The microcomputer 51 performs various scheduled processes in step S210.
The scheduled processing in step S210 includes processing during refueling, transmission/reception processing via the in-vehicle network, leakage diagnosis of the canister purge system, and the like.

Next, the microcomputer 51 proceeds to step S211 and determines whether the standby mode continues for a certain period of time or more.
Here, if the duration of the standby mode is longer than a certain period of time, the microcomputer 51 proceeds to step S212 and automatically cuts off the power supply by switching the power supply holding signal SS started in step S102 to low. , execute the shutdown process.
On the other hand, if the duration of the standby mode is less than the certain period of time, the microcomputer 51 bypasses step S212 and continues power supply with the operation mode set to the standby mode.

Next, abnormality diagnosis of the operation signal input circuit 53 executed by the microcomputer 51 will be explained.
FIG. 7 is a time chart showing the operation when the output of the low-pass filter circuit 53A constituting the operation signal input circuit 53 is fixed at the off level of the operation signal OS of the refueling switch 61.

If the output of the low-pass filter circuit 53A is stuck in the OFF state of the operation signal OS of the refueling switch 61, even if the operation signal OS of the refueling switch 61 is switched from OFF to ON at the timing T0, the output of the low-pass filter circuit 53A remains unchanged. It does not change.
Therefore, even if the operation signal of the refueling switch 61 is switched from off to on, the output signal HS of the holding circuit 53B is held low, and power supply to the microcomputer 51 based on the operation of the refueling switch 61 is disabled.

Therefore, the microcomputer 51 diagnoses the abnormality of the operation signal input circuit 53 as described above as follows.
In the starting state, the microcomputer 51 determines the determination time when the operation signal OS of the refueling switch 61 is on, the output signal HS of the holding circuit 53B is low, and the operation signal OS of the refueling switch 61 is on. When the diagnostic condition continues beyond T1, it is determined that the diagnostic condition is met.

When the diagnostic conditions are met, the microcomputer 51 determines that there is an abnormality in the operation signal input circuit 53 if the operation signal OS of the refueling switch 61 is on and the output signal HS of the holding circuit 53B is low when the on-time T of the operation signal OS of the refueling switch 61 reaches a judgment time T1+α (α is a margin for dealing with hardware response delays).
In other words, when the on state of the operation signal OS of the refueling switch 61 reaches the judgment time T1+α, if the operation signal input circuit 53 is in a normal state, the output signal HS of the holding circuit 53B will be high.

Therefore, the fact that the output of the holding circuit 53B is low at this time suggests an abnormality in the operation signal input circuit 53, such as sticking of the low-pass filter circuit 53A.
Therefore, the microcomputer 51 detects an abnormality in the operation signal input circuit 53 when the output signal HS of the holding circuit 53B is low when the state in which the operation signal OS of the refueling switch 61 is on reaches the determination time T1+α. judge.

Furthermore, an abnormality in the operation signal input circuit 53 includes an abnormality in which the output signal HS of the holding circuit 53B is not reset to low even if the microcomputer 51 outputs a reset signal to the holding circuit 53B.
FIG. 8 is a time chart showing the operation when an abnormality occurs in which the output signal HS of the holding circuit 53B constituting the operation signal input circuit 53 cannot be reset.

When the operation signal OS of the refueling switch 61 is switched from off to on, the output of the holding circuit 53B is delayed and rises to high level due to the delay function of the low-pass filter circuit 53A.
After that, the microcomputer 51 outputs a reset signal to the holding circuit 53B, but if the output of the holding circuit 53B is not reset to low and remains high, even if the microcomputer 51 switches the power holding signal SS to low, The microcomputer 51 will no longer be able to self-shut off power supply.
Therefore, the microcomputer 51 diagnoses the abnormality of the operation signal input circuit 53 as described above as follows.

The microcomputer 51 determines whether the diagnostic condition is satisfied when the operating signal OS of the refueling switch 61 is off and the output signal HS of the holding circuit 53B is at a high level in the activated state.
Then, at time Tβ when the diagnostic condition is satisfied, the microcomputer 51 outputs a reset signal RS to the holding circuit 53B, that is, a signal instructing to reset the output signal HS of the holding circuit 53B to low.

Thereafter, at time Tγ, which is a predetermined time after time Tβ, if the operation signal OS of the refueling switch 61 is off and the output signal HS of the holding circuit 53B is high, the microcomputer 51 controls the operation signal input circuit 53. Determine abnormality.
In other words, when the operation signal OS of the refueling switch 61 is off and the reset signal RS is output to the holding circuit 53B whose output signal HS is high, the output signal HS of the holding circuit 53B is not reset. If it remains high, it suggests that the output signal HS of the holding circuit 53B is fixed at high and cannot be reset.
Therefore, when the output signal HS of the holding circuit 53B is not reset to low even if the reset signal RS is output to the holding circuit 53B while the operating signal OS of the refueling switch 61 is off, the microcomputer 51 outputs the operating signal It is determined whether the input circuit 53 is abnormal.

Here, when the microcomputer 51 determines that there is an abnormality in the operation signal input circuit 53, it outputs an abnormality notification signal indicating the occurrence of an abnormality in the fuel tank system to the meter panel control device communicably connected via the in-vehicle network. However, the meter panel control device can be configured to turn on the warning light based on the abnormality notification signal.
That is, when the microcomputer 51 determines that the operation signal input circuit 53 is abnormal, it can warn the vehicle driver of the occurrence of the abnormality through a warning light or the like.
Further, when the microcomputer 51 determines that the operation signal input circuit 53 is abnormal, it can store the history of the abnormality determination in a nonvolatile memory (ROM).

The technical ideas described in the above embodiments can be used in any suitable combination as long as no contradiction occurs.
Furthermore, although the contents of the present invention have been specifically described with reference to preferred embodiments, it is obvious that a person skilled in the art can adopt various modified embodiments based on the basic technical concept and teachings of the present invention.

For example, the control device 50 can have other control functions, such as a function to control the operation of the internal combustion engine 20, specifically, fuel injection, ignition, etc., in addition to a function to perform refueling processing.
Further, the control device 50 can include multiple operation signal input circuits and perform fail-safe processing of switching to the second operation signal input circuit when it is determined that the first operation signal input circuit is abnormal.
Furthermore, the microcomputer 51 can cancel the execution of the refueling process if the period of time that has elapsed since the previous refueling process was performed is shorter than a setting.

50...Control device (vehicle control device), 51...Microcomputer (control unit), 52...Power supply unit, 52A...Power supply relay, 52B...Power supply IC, 53...Operation signal input circuit, 53A...Low pass filter circuit, 53B ...Holding circuit, 61...Refueling switch

Claims (6)

a low-pass filter circuit whose input signal is an operation signal of a vehicle's refueling switch;
a holding circuit that keeps the operation signal that has passed through the low-pass filter circuit turned on to make the output high, and the output is reset to low based on a reset signal;
A control unit that performs refueling processing when refueling a fuel tank of the vehicle,
obtaining an operation signal of the refueling switch that bypasses the low-pass filter circuit and the holding circuit;
outputting the reset signal to the holding circuit;
The control unit;
a power supply unit that turns on and off power supply from a power source to the control unit, the power supply unit supplying power to the control unit when the output of the holding circuit is high;
A vehicle control device having: 2. The vehicle control device according to claim 1,
The control unit is
The refueling process is performed when an operation signal of the refueling switch is changed from on to off after a first time has elapsed from the start and before a second time longer than the first time has elapsed from the start.
Vehicle control device. The vehicle control device according to claim 2,
The operation mode of the control unit includes a refueling mode when performing the refueling process, and a standby mode that consumes less power than the refueling mode,
The control unit includes:
The operation mode is set to the standby mode from after startup until the refueling process is performed,
When performing the refueling process, the operation mode is set to the refueling mode,
After the refueling process is completed, the operation mode is set to the standby mode.
Vehicle control device. The vehicle control device according to claim 3,
The control unit is
When the duration of the standby mode reaches a predetermined time, a signal is output to the power supply unit to instruct the power supply unit to stop supplying power, thereby shutting down the power supply unit.
Vehicle control device. The vehicle control device according to claim 1,
The control unit includes:
obtaining an output signal of the holding circuit;
When the output of the holding circuit is low after a determination time has elapsed since the operation signal of the refueling switch turned from OFF to ON in the starting state, the operation signal input circuit including the low-pass filter circuit and the holding circuit determine abnormality,
Vehicle control device. The vehicle control device according to claim 1,
The control unit includes:
obtaining an output signal of the holding circuit;
outputting the reset signal to the holding circuit when the output of the holding circuit is high and the operation signal of the refueling switch is off;
After outputting the reset signal to the holding circuit, when the output of the holding circuit remains high, determining an abnormality in the operation signal input circuit including the low-pass filter circuit and the holding circuit;
Vehicle control device.