JPH0347216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for various vehicles having a self-diagnosis function.

[Prior art]

Conventionally, in this type of device, when the main switch is opened, the power supply to the display device is cut off, and the display of the diagnostic results disappears. It has also been proposed to provide a memory circuit that retains the contents even if the display of the diagnostic results disappears, so that the display of the diagnostic results can be resumed when the main switch is turned on.

[Problem to be solved by the invention]

However, with the above system, attention is focused on the operation itself during operation (while the main switch is turned on), and if the diagnostic result display disappears when the main switch is opened, the display will be overlooked and the next There is a possibility that the abnormality will not be noticed until the main switch is turned on. Furthermore, some abnormal conditions are of low urgency or importance;
Constantly displaying such an abnormality display is troublesome for the driver, and may distract the driver from driving.

The present invention has been made in view of the above points, and
Vehicle control that changes the display timing according to the importance of the abnormal condition, displays only the truly necessary abnormality details during driving, and can also improve the effectiveness of reporting abnormal conditions of low importance. The purpose is to provide equipment.

[Means to solve the problem]

In order to achieve the above object, the vehicle control device according to the present invention has the following features: When the main switch is turned on, power is supplied from the battery via the main switch,
A control computer that operates an actuator in response to an input signal from a sensor based on arithmetic processing according to a control program executes a self-diagnosis of this control system at a predetermined timing after the main switch is turned on. In a vehicle control device configured to display results on a display, when the importance of an abnormal state detected by the self-diagnosis is high, the display immediately commands the display to display the abnormal state. a first command means; a memory means for storing the contents of the abnormality when the importance of the abnormal state is low; a timer means for measuring a certain period of time after the main switch is shut off; and a timer means for measuring the certain period of time. a supply means for supplying power from the battery to the control computer and the display unit without going through the main switch, and power is supplied to the control computer and the display unit by the supply unit; In some cases, the display device further includes a second command means for commanding the display device to display an abnormal state stored in the storage means.

[Effect]

With the above configuration, self-diagnosis of the control system is executed at a predetermined timing when the main switch is turned on.
As a result, only when the detected abnormal state is of low importance, the abnormal state is stored, and when the importance is high, the details of the abnormal state are immediately displayed. For stored abnormal conditions of low importance, after the main switch is shut off, power is supplied from the battery to the control computer and display for a certain period of time without going through the main switch, and the abnormal condition continues to be displayed. be done.

〔Effect of the invention〕

As described above, according to the present invention, only highly important abnormalities are displayed while driving the vehicle.
The driver's attention to driving operations is not disturbed by displaying abnormalities of low importance, and the system is configured so that abnormalities of low importance are displayed for a certain period of time after the main switch is shut off. , it is possible to improve the notification effect to the driver.

[Embodiment] FIG. 1 illustrates an embodiment of the present invention, in which reference numeral 10 indicates a circuit package of a control computer of a vehicle control device, and an input interface 11, an output interface 12, A control computer is composed of a ROM 13 as a program memory, a RAM 14 as a data memory, and a central processing unit (CPU) 15 that is connected to these and executes arithmetic processing according to a preset control program. has a built-in power supply circuit 16.

This control computer 10 is connected to a sensor 20 via an input interface 11, and outputs an output signal obtained by processing a signal received from the sensor 20 to an output interface 12.
It is applied to the actuator 30 via the controller to control the operation of the actuator 30.

The control computer 10 has a built-in program for self-diagnosis as well as a control program for operating the actuator, and executes self-diagnosis in the control state using signals from the set group 20 or internal control signals, and transmits the diagnosis results to the light-emitting type. It is designed to generate a control signal to be displayed on the display 40.

The power supply circuit 16 is connected to a line VA that is constantly supplied with power from an on-vehicle battery 50 and to a line VB that is supplied with power from the battery 50 via a main switch 60 that determines whether the device is actually activated or stopped. line
VB indicates whether the main switch 60 is turned on, and this signal is input to the input interface 1.
1 to the CPU 15.

Further, the power supply circuit 16 is connected to the output interface 12 under the control of the CPU 15 so as to receive the holding control signal SR.

When the main switch 60 is turned on, the power supply circuit 16 responds to the rise of the voltage on the line VB and supplies a stabilized voltage to the CPU 15 and other circuits based on the power supplied from the line VA.

The CPU 15 determines whether there is an abnormality in the control system by executing a known diagnostic program, and the display method is stratified depending on the content of the abnormality. Main switch 6
0, that is, during control, abnormal contents with a high degree of urgency are immediately displayed on the display 40, but contents of abnormalities with a low degree of urgency are only stored in the RAM 14.

When the main switch 60 is opened to stop the control, the line VB is cut off, but a holding circuit built into the power supply circuit 16 maintains power supply to the CPU 15 and others. This retention is controlled by the retention control signal SR under the control of the CPU 15, and during the retention period, the CPU 15 reads the contents of the RAM 14 and outputs it to the display 40 via the output interface 12. Displays abnormalities with low urgency.

FIG. 3 shows the circuit configuration of the power supply circuit 16. In the holding circuit 160, the image VA is connected to a switching element 162 via a diode 161, and from this switching element 162 the stabilized power supply circuit 16 is connected.
3, and a stabilized voltage is supplied to each circuit. The switching element 162 is composed of, for example, a relay, but may also be composed of a power transistor as shown in FIG.

The switching element 162 is controlled to be turned on or off by two control transistors 164 and 165. The first control transistor 164
It is controlled by a signal appearing at VB indicating the closed state of the main switch 60, and when the main switch 60 is closed, the transistor 164 becomes conductive.
The switching element 162 is made conductive. A capacitor 16 is connected between the line VB and the bias circuit 164A of the transistor 164 via a diode 166.
7 is connected, and even after the main switch 60 is cut off, the bias of the transistor 164 is maintained for a predetermined period of time to maintain the conductive state. This holding time is the CPU 1
5 receives and generates the hold control signal SR.

The second control transistor 165 is turned on and off in response to the holding control signal SR, and after the main switch 60 is opened, the first transistor 164
Even when the switching element 162 is cut off, it maintains a conductive state under the control of the CPU 15 and has a function of keeping the switching element 162 conductive.

FIG. 4 shows an outline of the control program preset in the ROM 13, and the calculation procedure of the CPU 15 is divided into two systems depending on the result of determination at step 101, which determines whether the main switch 60 is turned on or not.
First, if the main switch 60 is turned on, the content of the abnormality with a high degree of urgency is diagnosed in step 102, and if there is an abnormality, it is displayed on the display 40. Further, in step 103, the holding control signal SR is set to low level, and the second transistor 1 is activated in the power supply circuit 16.
Make sure that 65 is not conductive.

Furthermore, in step 104, the content of the abnormality with a low degree of urgency is determined, and the content is stored in the RAM 14.
Step 105 shows a normal control program executed when the main switch 60 is turned on.

On the other hand, when the main switch 60 is opened, it is determined in step 106 whether or not the main switch has just been opened.
At step 107, the holding control signal SR is set to high level to hold the power supplied from the power supply circuit 16. Also, although not shown, a timer is started at this time to measure time.

Next, in step 108, the content of the abnormality with a low degree of urgency is read out from the RAM 14, and in step 109, it is displayed on the display 40.

In step 110, the system waits until a certain period of time has elapsed from the contents of the timer, and after the certain period of time has elapsed, in step 111, the holding control signal SR is changed to low level to release the holding state of the power supply circuit 16. As a result, the control computer 10 is immediately cut off from the power supply, and the display on the display 40 stops and the operation stops.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is an electrical wiring diagram showing the configuration of the power supply circuit 16 in FIG. 1, and FIG. 3 shows another configuration of the power supply circuit 16. The electrical wiring diagram, FIG. 4, is a control flowchart of a control program executed by the control computer shown in FIG. 10... Control computer package, 15
...Central processing unit (CPU), 16...Power supply circuit, 20
...sensor, 30...actuator, 40...indicator, 50...vehicle battery, 60...main switch, 162...switching element, 163...stability circuit power supply circuit, 164, 165...control transistor.

Claims (1)

[Claims] 1. A control device that is supplied with power from a battery via the main switch when the main switch is turned on, and operates an actuator in response to an input signal from a sensor based on arithmetic processing according to a control program. In the vehicle control device, the computer executes a self-diagnosis of the control system at a predetermined timing after the main switch is turned on, and displays the diagnosis result on a display, a first command means for immediately commanding the display to display the abnormal state when the detected abnormal state is of high importance; and a first command means for storing the abnormality contents when the abnormal state is of low importance. storage means; timer means for counting a predetermined period of time after the main switch is shut off; while the predetermined period of time is being counted, power is supplied to the control computer and display from the battery without going through the main switch; a supply means for supplying the power, and when power is supplied to the control computer and the display by the supply means, instructing the display to display an abnormal state stored in the storage means. A vehicle control device comprising: second command means.