JP2007132264A - Vehicular electronic control device and method for detecting open of fueling opening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular electronic control device capable of detecting danger of a case that a fueling opening opens during travel, informing a driver of that and executing safe fail-safe process. <P>SOLUTION: An engine ECU always determines whether a vehicle is traveling or not. When the vehicle is traveling, the engine EUC determines whether the fueling opening is open or not. If the fueling opening is open, a room light is turned on (step 101-103). Then, an engine is stopped by performing fuel cut and ignition cut of the engine, and a brake is gradually actuated by a brake ECU after fixing change gear ratio of a transmission. On the other hand, when the vehicle is not traveling, the engine EUC determines whether the fueling opening is open or not in same manner. If the fueling opening is open, fuel supply is shut off when IG switch is turned on, and the brake is forcibly actuated when ACC switch is turned on (step 107-111). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicular electronic control device, and more particularly to a vehicular electronic control device that performs a fail-safe process when a vehicular refueling port is opened during traveling, and to detect the opening of a refueling port used in the vehicular electronic control device. Regarding the method.

  A vehicle electronic control device (hereinafter referred to as ECU) that controls a vehicle engine, an automatic transmission (automatic transmission), etc., performs electronic control of the vehicle by exchanging signals with the control mechanism of the vehicle. Yes, the target control is performed by one ECU, such as an engine control ECU or a brake control ECU.

  The engine control ECU controls the power train unit such as the engine and the automatic transmission, and controls the fuel injection amount, the ignition timing, the shift timing, etc. based on the sensor signals such as the intake air amount and the air-fuel ratio. A command value is calculated, and an actuator such as an injector or an ignition coil is controlled based on the result.

On the other hand, in a vehicular engine automatic stop automatic restart device that automatically stops an engine when a predetermined stop condition is satisfied and automatically restarts the engine that is automatically stopped when a predetermined restart condition is satisfied, By providing a sensor that detects the opening of the engine and prohibiting the automatic restart of the engine when the opening of the refueling port during the automatic engine stop is detected, the engine can be prevented from restarting during refueling. It has been proposed (see, for example, Patent Document 1).
JP 2000-110609 A

  As described above, in order to prevent the engine from being restarted during refueling, it has been proposed to prohibit the restart of the engine when the opening of the fuel filler opening is detected. If the refueling port is opened for a reason, it may cause a vehicle fire due to fuel leakage such as gasoline, but in the current vehicle it is not notified to the driver or fail safe processing is not done . Further, even in a state where the vehicle is stopped, fail-safe processing for a vehicle fire or the like is not performed.

On the other hand, with the spread of self-gas stations in recent years, there are many scenes where drivers are directly involved in refueling, and there is a possibility that danger such as forgetting to close the filler port may occur.
In the state where the engine is operated, the return fuel returned from the fuel injection unit side to the fuel tank side is warmed due to high heat on the exhaust pipe side, for example, so that the temperature of the fuel in the fuel tank gradually increases. Therefore, the amount of fuel vapor in the fuel tank increases during traveling, and there is a high risk that fuel vapor will be discharged into the atmosphere when the fuel filler opening is opened. Furthermore, when the fuel filler opening is opened, there is a possibility that the fuel itself leaks and a fire occurs.

  Conventionally, a sensor is provided to detect the opening of the fuel filler opening. However, if a sensor for detecting the opening of the filler filler is newly provided in this way, there is a problem that the number of parts increases and the cost increases. Arise.

  The present invention has been made in view of the above-described problems, and it is possible to detect a danger when a fuel filler port is opened during traveling, notify the driver, and implement a safe fail-safe process. It is an object of the present invention to provide a method of detecting an opening of a fuel filler port that can detect the opening of the fuel filler port without requiring a control device and a sensor.

In order to achieve the above-described object, an electronic control device for a vehicle (1) according to the present invention includes:
An electronic control device for a vehicle provided with a control means for controlling an engine,
The control means stops the engine when the opening of the fuel filler opening is detected during traveling of the vehicle.

Moreover, the vehicle electronic control device (2) according to the present invention is the vehicle electronic control device (1).
When the opening of the fuel filler opening is detected when the vehicle is running, the control means stops the engine after fixing the transmission,
An electronic control device for a vehicle (3) according to the present invention is an electronic control device for a vehicle (1).
When the opening of the fuel filler opening is detected during traveling of the vehicle, the control means gradually stops the fuel pump to perform fuel cut, and then stops the engine.

Furthermore, the vehicle electronic control device (4) according to the present invention is a vehicle electronic control device (1).
When the opening of the fuel filler opening is detected when the vehicle is running, the control means stops the engine, then forcibly drives the brake and gradually decelerates,
The vehicle electronic control device (5) according to the present invention includes any one of the vehicle electronic control devices (1) to (4).
The above-mentioned control means detects the theoretical fuel consumption based on the engine speed during traveling within a certain period of time, and compares this with the actual fuel loss, thereby detecting that the fuel filler has opened. Features.

Moreover, the vehicle electronic control device (6) according to the present invention includes:
An electronic control device for a vehicle comprising a control means for controlling the vehicle,
When the opening of the fuel filler opening is detected during traveling of the vehicle, the control means gradually stops the vehicle.

Furthermore, the opening detection method (1) for the fuel filler opening according to the present invention includes:
It is characterized in that the theoretical fuel consumption is obtained based on the number of engine revolutions during traveling within a certain period of time, and this is compared with the actual fuel loss to detect the opening of the fuel filler opening.

  According to the vehicle electronic control device (1) of the present invention, the engine is stopped when the opening of the fuel filler opening is detected while the vehicle is running, so that it is possible to prevent a vehicle fire caused by fuel leakage such as gasoline. According to the vehicle electronic control device (2) of the present invention, when the opening of the fuel filler opening is detected when the vehicle is traveling, the transmission is fixed, so that the shock at the time of shifting can be eliminated.

  Further, according to the vehicle electronic control device (3) according to the present invention, when the opening of the fuel filler opening is detected during vehicle travel, the fuel pump is gradually stopped, and the shock during deceleration due to the injection cut can be eliminated. Therefore, the fuel can be prevented from leaking out of the vehicle. According to the vehicle electronic control device (4) according to the present invention, when the opening of the fuel filler opening is detected during vehicle travel, the brake is forcibly driven and gradually decelerated. Therefore, it is possible to prevent the fuel from leaking out of the vehicle.

  Furthermore, according to the vehicle electronic control device (5) and the fuel filler opening detection method (1) according to the present invention, the theoretical fuel consumption and the actual fuel consumption calculated from the engine speed during running within a certain time period. For example, if the difference from the amount exceeds a preset threshold value, it is determined that the filler opening is open, so no sensor is required and the opening of the filler opening is detected at low cost. Can do.

  In addition, according to the vehicle electronic control device (6) of the present invention, when the opening of the fuel filler opening is detected during vehicle travel, the vehicle is gradually stopped. Coming vehicle fire can be prevented.

  Hereinafter, an embodiment in which an electronic control device for a vehicle according to the present invention is applied to an engine control device will be described with reference to the drawings. FIG. 1 is a block diagram showing a system configuration including an engine control device. As shown in FIG. 1, this system includes an engine ECU 1, an engine 2, a transmission 3, a fuel pump 4, a fuel tank 5, a brake ECU 6, and a brake system 7. It is comprised by.

  The engine ECU 1 performs electronic control of the vehicle by exchanging signals with the control mechanism of the vehicle, and the ECU 1 receives the acceleration G received by the vehicle detected by a sensor group equipped on the vehicle. Information such as steering wheel, accelerator, brake, engine, etc. is input. The ECU 1 performs predetermined calculation processing based on the transmitted signal, and the vehicle 1 is equipped with a signal for controlling the calculation result, for example, fuel injection amount, ignition timing, bypass air amount, and the like. It is sent to a control mechanism such as an actuator (not shown), and ignition timing control, knock control, idle speed control, etc. are comprehensively performed centering on fuel injection amount control of the engine 2.

  As shown in the figure, the engine ECU 1 includes a CPU 11, a ROM (Read Only Memory) 12, and a RAM (Random Access Memory) 13. The CPU 11 controls each hardware part of the engine ECU 1, and stores a program stored in the ROM 12. Based on the above, various programs such as engine control and fail-safe processing when the fuel filler opening is opened are executed. The RAM 13 is composed of an SRAM or the like and stores temporary data generated when the program is executed.

The engine ECU 1 includes an IG switch 21 that detects an on / off switching state of an ignition switch (IG), an ACC switch 22 that detects an on / off switching state of an accessory (ACC) switch, and a vehicle speed. Outputs of various switches and sensors such as a vehicle speed sensor 23 and an engine speed sensor 24 for detecting the engine speed are input, and a room light 25 is connected.
The transmission 3 shifts gears, and the gear ratio is switched by rearranging combinations of a plurality of gears.

  The fuel pump 4 is disposed inside the fuel tank 5 and pumps the fuel in the fuel tank 5 to a fuel injection valve (not shown). The fuel tank 5 communicates with a fuel filler port 31 for replenishing fuel from the outside of the vehicle. The fuel filler port 31 is openable and closable. During fueling operation, the fuel filler port 31 is opened to replenish the fuel, and then the fuel filler port 31 is opened. The closing operation is performed.

Furthermore, the refueling port 31 is provided with an opening sensor 32 for detecting the open / closed state of the refueling port 31, for example, a mechanical sensor. When the lid of the refueling port 31 is closed, this lid presses the mechanical sensor. The switch is turned on.
The fuel tank 5 is provided with a fuel remaining amount sensor 33 for detecting the remaining amount of fuel.

  The brake ECU 6 is configured by a CPU, a ROM, a RAM, and the like, similar to the engine ECU 1, and detects a vehicle speed sensor that detects the traveling speed of the vehicle, an acceleration / deceleration sensor that detects an acceleration / deceleration applied to the vehicle, and an accelerator pedal depression amount. A detection signal is input from a sensor such as an accelerator pedal opening sensor or a brake sensor that detects the depression amount of the brake pedal. For example, a signal for operating the brake system 7 is output when the brake pedal is depressed. .

Next, the operation of the fail-safe process when the fuel filler opening in the engine ECU 1 will be described with reference to the flowchart of FIG.
The CPU 11 of the engine ECU 1 always executes a fail-safe processing program at the time of opening of the fuel filler opening shown in the flowchart of FIG. 2. When this program is started, first, whether or not the vehicle is traveling is determined by the output of the vehicle speed sensor 23. Is determined (step 101).
When it is determined that the vehicle is traveling, the CPU 11 determines whether or not the fuel filler port is open based on the output of the opening sensor 32 (step 102), and when it is determined that the fuel filler port is not open. Quit the program.

On the other hand, if it is determined in step 102 that the fuel filler opening is open, the CPU 11 turns on the room light 25 (step 103), and then performs engine 2 fuel cut and ignition cut to bring the engine 2 into the engine stall state. The engine is stopped (step 104).
At the same time, the CPU 11 outputs the control signal to the transmission 3 to fix the transmission gear ratio of the transmission 3 (step 105), and then outputs the control signal to the brake ECU 6 to gradually release the brake of the brake system 7. Drive (step 106).

As described above, when it is determined that the fuel filler port is open while the vehicle is running, the transmission is fixed, so that the shock at the time of shifting can be eliminated and the brake is gradually driven so that braking is performed. Since the shock can be reduced, fuel can be prevented from leaking out of the vehicle.
In addition, since the room light 25 is turned on before the failsafe process is performed and the fuel filler opening is opened, the driver can be notified in advance that the failsafe works, so that the vehicle can be stopped more safely.

Further, when it is determined in step 101 that the vehicle is not traveling, the CPU 11 similarly determines whether or not the fuel filler port is opened (step 107), and when it is determined that the fuel filler port is not opened, When the program is finished and it is determined that the fuel filler opening is open, it is determined whether or not the IG switch 21 is turned on (step 108). When it is determined that the IG switch 21 is on, the CPU 11 controls the fuel pump 4 to cut off the fuel supply (step 109) and outputs a control signal to the brake ECU 6 to thereby generate the brake system 7. Is forcibly driven (step 110).
As a result, when the user tries to refuel with the IG switch turned on, the fuel supply is completely cut off by the forced drive of the fuel pump, so that ignition can be prevented and dangers such as a vehicle fire can be prevented.

On the other hand, if it is determined in step 108 that the IG switch is off, the CPU 11 determines whether or not the ACC switch 22 is on (step 111), and determines that the ACC switch 22 is off. If so, exit the program.
If it is determined in step 111 that the ACC switch is on, the CPU 11 outputs a control signal to the brake ECU 6 to forcibly drive the brake system 7 (step 110).
As a result, when the user opens the fuel filler opening in an ACC switch-on state, the vehicle can be completely stopped by the forced driving of the brake. The danger of a vehicle fire can be prevented.

  In the above embodiment, when the opening of the fuel filler opening is detected while the vehicle is running, after stopping the engine, the transmission gear ratio is fixed, the brake is gradually driven, and the forced drive is strongly performed in the stop direction. Although the forced drive of each actuator is performed, the forced drive according to the vehicle state can be performed by changing the method of applying the forced drive according to the state of the vehicle speed and the engine speed.

  FIG. 3 is an example of a map table in the case of changing the method of forced driving according to the state of the vehicle speed and the engine speed, and when the vehicle is traveling at a low speed where both the vehicle speed and the engine speed are low, as indicated by point a in the figure. As shown in the above embodiment, the forced drive is strongly performed in the stop direction, and as shown in the point b in the figure, when driving on a highway where both the vehicle speed and the engine speed are large, sudden deceleration is dangerous. It is preferable to perform forced driving in the stop direction. Further, as shown at point c in the figure, the vehicle is completely stopped when the vehicle is stopped.

Hereinafter, the operation when the forced drive in the stop direction is gradually performed during high-speed traveling will be described with reference to the flowchart of FIG.
The apparatus configuration is the same as that shown in FIG.
The CPU 11 of the engine ECU 1 always executes a fail-safe processing program at the time of opening of the fuel filler opening shown in the flowchart of FIG. 4. When this program is started, first, whether or not the vehicle is running is determined by the output of the vehicle speed sensor 23. Is determined (step 201).
When it is determined that the vehicle is traveling, the CPU 11 determines whether or not the fuel filler port is open based on the output of the opening sensor 32 (step 202), and when it is determined that the fuel filler port is not open. Quit the program.

  When it is determined in step 202 that the fuel filler port is open, the CPU 11 determines whether or not the vehicle is traveling at a high speed based on the outputs of the vehicle speed sensor 23 and the engine speed sensor 24 (step 203). When it is determined that the vehicle is in the middle, the fail-safe process at the time of low-speed traveling in Step 103 to Step 106 in the flowchart of FIG.

  On the other hand, if it is determined in step 203 that the vehicle is traveling at high speed, the CPU 11 turns on the room light 25 (step 205) and then outputs a control signal to the transmission 3 to fix the transmission gear ratio (see FIG. Step 206). Next, by controlling the signal to the fuel pump 4, the fuel injection amount is gradually decreased (step 207), and it is determined whether or not the fuel injection from the fuel pump 4 is stopped (step 208).

When it is determined that the fuel injection from the fuel pump 4 has stopped, the CPU 11 stops the engine 2 by cutting off the ignition of the engine 2 (step 209), and then outputs a control signal to the brake ECU 6. Then, the brake of the brake system 7 is gradually driven (step 210).
As described above, when it is determined that the refueling port is open during high-speed traveling, the fuel pump is gradually stopped, so the shock during deceleration due to the injection cut can be eliminated and the fuel leaks out of the vehicle. Can be prevented.
Note that the fuel pump is gradually stopped to perform the fuel injection cut gradually, but the injection control amount is gradually decreased (the injection time is gradually shortened) without stopping the fuel pump. The fuel injection cut may be performed gradually.

  When it is determined in step 201 that the vehicle is not traveling, it is determined whether or not the fuel filler opening is open (step 211). The subsequent operations of step 211 to step 215 are the same as those in the flowchart of FIG. Since it is the same as the operation of Step 107 to Step 111, detailed description is omitted.

In the above embodiment, the opening of the fuel filler port is detected by the sensor, but the opening of the fuel filler port can also be detected without using the sensor. A detection method for detecting the above will be described.
The CPU 11 of the engine ECU 1 always executes the opening detection program for the fuel filler opening shown in the flowchart of FIG. 5. When this program is started, it is determined whether or not a predetermined time has elapsed by a timer (not shown). (Step 301) Every time a fixed time elapses, the theoretical fuel consumption is calculated from the engine speed within the fixed time (Step 302).
That is, as shown in FIG. 6A, the CPU 11 obtains the theoretical fuel consumption from the area based on the engine speed change within a certain time.

Next, the CPU 11 calculates the actual fuel consumption within the predetermined time based on the output of the fuel remaining amount sensor 33 of the fuel tank 5 and then calculates the difference between the theoretical fuel consumption and the actual fuel consumption. (Step 303). Then, the difference between the calculated theoretical fuel consumption and the actual fuel consumption is compared with a predetermined threshold value (step 304), and as shown in FIG. 6B, the theoretical fuel consumption and the actual fuel consumption are calculated. If the difference is greater than the threshold value, the filler port is open (because fuel is spilled from the filler port or the fuel has vaporized and leaked to the outside, so the actual fuel consumption is considered to be large) And the opening state of the fuel filler opening is stored in the RAM 13 (step 305).
Thereby, it is determined that the fuel filler opening is open in subsequent determination steps such as step 102 in the flowchart of FIG.

  As described above, when the difference between the theoretical fuel consumption calculated from the engine speed during driving within a certain time and the actual fuel consumption exceeds the preset threshold value, the refueling port opens. Therefore, it is possible to detect the opening of the fuel filler port at a low cost without the need for a sensor.

  In the above embodiment, when the opening of the fuel filler opening is detected when the vehicle is running, the driver is notified that the fail safe process is activated by turning on the room light by turning on the room light. The driver can also be notified that will work.

It is a block diagram which shows the system configuration | structure provided with the engine control apparatus to which the vehicle electronic control apparatus of this invention is applied. It is a flowchart which shows the effect | action of the fail safe process at the time of opening of a fuel filler opening. It is a figure which shows an example of the map table | surface in the case of changing how to apply forced drive according to the state of a vehicle speed and an engine speed. It is a flowchart which shows an effect | action when implementing the forced drive to a stop direction gradually at the time of high speed driving | running | working. It is a flowchart which shows an effect | action in the case of detecting opening of a fueling port, without using the sensor provided in the fueling port. It is a figure which shows an example of the calculated value of the theoretical fuel consumption at the time of opening determination of a fuel filler opening, and an actual fuel consumption.

Explanation of symbols

1 Engine ECU
11 CPU
12 ROM
13 RAM
2 Engine 3 Transmission 4 Fuel pump 5 Fuel tank 6 Brake ECU
7 Brake system 21 IG switch 22 ACC switch 23 Vehicle speed sensor 24 Engine speed sensor 31 Refueling port 32 Opening sensor 33 Fuel level sensor

Claims (7)

An electronic control device for a vehicle provided with a control means for controlling an engine,
An electronic control device for a vehicle, wherein the control means stops the engine when the opening of the fuel filler opening is detected during vehicle travel. In the vehicle electronic control device according to claim 1,
An electronic control device for a vehicle, wherein when the opening of the fuel filler opening is detected during traveling of the vehicle, the control means stops the engine after fixing the transmission. In the vehicle electronic control device according to claim 1,
An electronic control device for a vehicle, wherein when the opening of the fuel filler opening is detected during traveling of the vehicle, the control means gradually stops the fuel pump to perform fuel cut, and then stops the engine. In the vehicle electronic control device according to claim 1,
An electronic control device for a vehicle, wherein when the opening of the fuel filler opening is detected during traveling of the vehicle, the control means stops the engine and then forcibly drives the brake to gradually decelerate. In the vehicle electronic control device according to any one of claims 1 to 4,
The above-mentioned control means detects the theoretical fuel consumption based on the engine speed during traveling within a certain period of time, and compares this with the actual fuel loss, thereby detecting that the fuel filler has opened. A vehicular electronic control device. An electronic control device for a vehicle comprising a control means for controlling the vehicle,
An electronic control device for a vehicle, wherein when the opening of the fuel filler opening is detected during traveling of the vehicle, the control means gradually stops the vehicle. A fuel filler opening characterized by detecting the theoretical fuel consumption based on the engine speed during traveling within a certain period of time and comparing this with the actual fuel loss amount to detect that the filler opening has been opened. Aperture detection method.

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