JP2001157302A - Electric system diagnostic apparatus of electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve visibility of a display means by displaying a state that a vehicle can run by lighting the display means itself which displays the state of a vehicle such as a vehicle speed, a shift position and battery residual capacity, in an electric system diagnostic apparatus of an electric motor coach. SOLUTION: The electric system diagnostic apparatus of an electric motor coach is equipped with a judging means for deciding a state that a vehicle can run, an LCD 41 displaying the state of the vehicle such as a vehicle speed, a shift position and battery residual capacity, and a display control means which puts the LCD 41 in a state of display when the decision means decides the state that a vehicle can run, and puts the LCD 41 in a state of not-display in the other case. This electric system diagnostic apparatus puts the LCD 41 itself in a state of display when a power source key is tuned on and the vehicle is in a state that running is possible, and can inform it to a driver that the vehicle can run.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric system diagnostic apparatus for an electric vehicle, which is provided with a travelability determining means for determining whether or not the vehicle is in a travelable state.

[0002]

2. Description of the Related Art Conventionally, an electric system diagnostic apparatus for an electric vehicle includes a motor for driving wheels, an inverter that inputs a DC voltage from a high-voltage battery, converts the DC voltage into an AC voltage, and supplies the AC voltage to the motor. A DC / DC converter that receives a DC voltage from a battery and steps down the voltage to supply it to a low-voltage battery, a power key for activating an electric system, an analog vehicle speedometer, a battery fuel gauge, and the like. LE
D, a display means comprising a vehicle runnable lamp constituted by a light bulb or the like and informing the driver that the vehicle is in a runnable state; and a central processing unit for controlling the inverter, the DC / DC converter and the vehicle runnable lamp. A vehicle electronic control device (hereinafter, referred to as a vehicle ECU) having a processing device (hereinafter, referred to as a CPU) is provided.
When the power key is on, the voltage of the high-voltage battery is in the normal range, the inverter is in the normal state, and the DC / DC converter is in the normal state, the electric system diagnostic device for the electric vehicle is turned on. When it is determined that the vehicle is in a runnable state, the vehicle travelable lamp is turned on. In other cases, the vehicle is determined to be in a state in which the vehicle cannot travel, and the vehicle travelable lamp is controlled to be turned off.

In an electric system diagnostic apparatus for an electric vehicle, a liquid crystal display (hereinafter, referred to as an LCD) is used as a display means for displaying a vehicle speed indicator, a battery level indicator, and a vehicle running lamp.
That. ) And a digital display such as a fluorescent display tube (hereinafter, referred to as VFD).

[0004]

However, in the former device of the above-mentioned prior art, a drive circuit for controlling lighting of a vehicle-runnable lamp is provided.
There have been problems that the manufacturing cost is increased and that an extra space for installing the drive circuit is required. Further, in the latter device, even if the vehicle running lamp is turned on, only a relatively small portion of the LCD and VFD screens are turned on, so that the visibility of the vehicle running lamp is poor. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to turn on a display means for displaying a vehicle state such as a vehicle speed, a shift position, and a remaining battery power so that the vehicle can travel. It is an object of the present invention to reduce the number of components by reducing the number of components, to reduce the size of an electric system diagnostic device for an electric vehicle, to reduce the manufacturing cost thereof, and to improve the visibility of the device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a structural feature of the present invention is to provide an electric vehicle provided with travelability determining means for determining whether the vehicle is in a travelable state. In the electrical diagnostic device, a display means for displaying a vehicle state such as a vehicle speed, a shift position, and a remaining battery level, and a display means for displaying the display means when the travelability determination means determines that the vehicle is in a travelable state, A display control unit that sets the display unit to a non-display state in cases other than the above is provided.

In the electric system diagnostic apparatus for an electric vehicle configured as described above, when the power key is turned on, if the vehicle can run, the display control means sets the display means to the display state, and the display means displays the display means. Indicates the vehicle state. On the other hand, when the power key is turned on and the vehicle cannot travel, the display control means sets the display means to the non-display state.

Further, for example, the traveling possibility determination means of the present invention is arranged such that a power key for turning on an electric system of a vehicle is in an ON state, and a voltage of a battery which is a power source of a motor for driving wheels is within a normal range. At some point, it is preferable to determine that the vehicle is in a runnable state. With this, the same operation as described above can be obtained.

Further, the electric system diagnostic apparatus for an electric vehicle according to the present invention includes a parking brake determining means for determining whether or not the parking brake is applied, and that the parking brake is applied by the parking brake determining means. It is preferable to provide blinking control means for blinking the displayed display means when the judgment is made. According to this, if the parking brake is applied, the display means is made to blink.

[0010]

According to the present invention, if the vehicle is in a runnable state when the power key is turned on, the display means itself for displaying the vehicle state such as the vehicle speed, the shift position, and the remaining battery level is displayed. By setting the state, the driver can be informed that the vehicle can run, so that the visibility of the electric system diagnostic device for the electric vehicle can be improved. Further, in this case, a special vehicle running lamp and a drive circuit for controlling lighting / non-lighting of this lamp are not required. Therefore, the number of components can be reduced as compared with the related art, so that the electric system diagnostic device of the electric vehicle can be reduced in size and the manufacturing cost can be reduced.

The parking brake judging means for judging whether or not the parking brake is applied, and the display means which is displayed when the parking brake judging means judges that the parking brake is applied, are flickered. According to the one provided with the blinking control means,
If the parking brake is applied, the driver can be informed that the parking brake is applied by blinking the display means itself, so that the visibility of the electric system diagnostic device of the electric vehicle is improved. Can be. Further, in this case, there is no need for a parking brake lamp for displaying whether or not the parking brake is being applied and a drive circuit for controlling lighting / non-lighting of this lamp. Therefore, the number of components can be reduced as compared with the related art, so that the electric system diagnostic device of the electric vehicle can be reduced in size and the manufacturing cost can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing an entire electric system diagnostic apparatus for an electric vehicle.

The electric system diagnostic apparatus for an electric vehicle is a vehicle ECU for controlling the operation of the electric vehicle based on an operation of a driver.
10 is provided. The vehicle ECU 10 includes the power key 2
1, an input interface 11 for inputting signals from the shift position switch 22 and the parking brake switch 23. The power key 21 activates the electric system of the electric vehicle and outputs a signal indicating the on / off state of the power key 21 to the input interface 11. The shift position switch 22 detects the position of the shift lever (for example, backward (R), neutral (N), forward (D)), and outputs a signal representing the detected position of the shift lever to the input interface 11. The parking brake switch 23 detects whether or not the parking brake is applied, and outputs a signal indicating the detected state of the parking brake to the input interface 11.

The vehicle ECU 10 includes an A / D conversion circuit 13, a communication interface 14, an output interface 15, and a liquid crystal display (LCD) driver 1 connected to an input interface 11 via a bus 12.
6, a central processing unit (CPU) 17 and a read-only memory (ROM) 18.

The A / D conversion circuit 13 detects a degree of opening of an accelerator when an accelerator pedal (not shown) is depressed, and outputs a voltage corresponding to the degree of opening of the accelerator. And a high-voltage battery 34 and a low-voltage battery 3 via a DC / DC converter 36 described later.
7 are input. The communication interface 14 is a motor electronic control device (hereinafter referred to as a motor EC).
U. ) 31 is connected to the EC for this motor.
The U31 transmits a torque amount and the like calculated in accordance with the accelerator opening amount input by the A / D conversion circuit 13, and receives a rotation number of the motor 32 for driving wheels from the motor ECU 31.

The motor ECU 31 controls the inverter 33 so that the motor 32 outputs the torque amount. That is, the inverter 33 is connected to the high-voltage battery 3.
4 (for example, 72 volts) from the relay 35
, And is converted into an AC voltage corresponding to the torque amount and supplied to the motor 32. Thus, the wheels can be driven according to the accelerator opening amount.

The output interface 15 is a vehicle EC.
When the system of U10 stops, a system stop signal for stopping the system of the motor ECU 31 is output, and a signal for opening and closing is output to the relay 35. When charging the low-voltage battery 37, the output interface 15 supplies the DC / DC converter 36 with the charge calculated according to the voltage value of the low-voltage battery 37 input to the A / D conversion circuit 13. To output a low-voltage battery control signal. As a result, the DC / DC converter 36 receives the DC voltage from the high-voltage battery 34, reduces the voltage based on the low-voltage battery control signal, and supplies the low-voltage battery 37. When charging the high-voltage battery 34, the output interface 15 supplies the DC / DC converter 36 with the charge calculated in accordance with the voltage value of the high-voltage battery 34 input to the A / D conversion circuit 13. To output a high-voltage battery control signal. Thus, the DC / DC converter 36
An AC voltage from an AC power supply (not shown) is input, and a rectified and smoothed DC voltage is reduced based on a high-voltage battery control signal and supplied to the high-voltage battery 34.

A display device 40 is connected to the vehicle ECU 10. As shown in FIG. 2, the display device 40 includes an LCD 41 for displaying the remaining positions of the shift position, the speedometer and the high-voltage battery 34, and an LCD for displaying the mileage.
42, a motor warning lamp 43a for notifying an abnormality of the motor 32, a battery warning lamp 43b for notifying an abnormality of the low-voltage battery 37, and a turn operation lamp 4 for notifying that the left and right turn signal lamps are blinking.
3c, and a lamp group 43 composed of a beam operation lamp 43d for notifying that the high beam of the headlamp is turned on. Note that the lamp group 43 includes LEDs, light bulbs, and the like. LCDs 41 and 42 are LCDs
The display is performed based on the LCD control signal input from the driver 16, and the lamp group 43 is turned on based on the lighting control signal input from the output interface 15.

The CPU 17 is stored in the ROM 18 and shown in FIG.
Is executed to determine whether or not the electric vehicle is in a runnable state, and the display device 40 displays the result of the determination. Note that a watchdog circuit 19 for detecting an abnormality of the CPU 17 is connected to the CPU 17, and the watchdog circuit 19 outputs a reset signal to the CPU 17 when detecting an abnormality.

Next, the operation of the embodiment configured as described above will be described with reference to the flowchart of FIG. When the driver turns on the power key 21 and turns on the power to the vehicle ECU 10, the CPU 17 starts executing the program in step 100, and executes steps 102, 106-1.
At 12, it is determined whether or not the electric vehicle is in a runnable state.

When the power key 21 is on, the voltage value of the high-voltage battery 34 falls within a predetermined range (for example, 50 to 50).
100 volts), the electric vehicle is not connected to an AC power supply outside the vehicle to charge the high voltage battery 34, the shift lever is in the neutral position, and the vehicle ECU 10 and the motor ECU 31 If the communication is performed normally, that is, if the electric vehicle is in a runnable state, the CPU 17 determines “Yes” in step 102, turns on the LED group 43 in step 104, and proceeds to steps 106 to 112. At "Ye
s "," No "," Yes "," Yes ", and the program proceeds to step 114.

In steps 114 to 118, preparations are made for running the electric vehicle. In particular,
The CPU 17 closes the relay 35 in step 114 to electrically connect the high-voltage battery 34 to the inverter 33, and then in step 116,
3 is turned off, and at step 118, the LCD 41 is turned off.
And the LCD 42 is lit. At this time, LCD
At 41, the shift position is displayed as "N", the speedometer is displayed as "0", and the remaining amount of the high-voltage battery 34 is displayed on a scale corresponding to the remaining amount of the battery at that time.

Then, the CPU 17 advances the program after the processing in step 118 to step 120 and subsequent steps, and performs the circulation processing in steps 120 to 124. If the parking brake is applied, "Ye"
s ", the speedometer display on the LCD 41 flashes in step 122, and the program proceeds to step 120.
If the parking brake has not been applied, "No" is determined in step 120, and the speedometer display on the LCD 41 is turned on in step 124.

If the electric vehicle is in a state where it cannot travel, for example, if the power key 21 is in an off state, the CPU 17
Determines "No" in step 102, advances the program to step 130, and ends the execution of the program in step 130.

If the voltage value of the high-voltage battery 34 is not within the predetermined range (for example, 50 to 100 volts), the CPU 17 determines “No” in step 106 and advances the program to step 126. , Step 1
After the warning buzzer starts sounding in step 26,
At 8, it is determined whether or not the power key 21 is off. At this time, step 12 is performed until the power key 21 is turned off.
6 and 128 are repeatedly executed, the warning buzzer continues to sound, and when the power key 21 is turned off, CP
U17 determines "Yes" in step 128, and ends the execution of the program in step 130.

If the electric vehicle is connected to an AC power source outside the vehicle to charge the high-voltage battery 34,
The CPU 17 determines “Yes” in step 108, advances the program to step 126 and subsequent steps, and executes the program as described above.

If the shift lever is not at the neutral position, the CPU 17 determines "No" at step 110.
The program proceeds to step 132, where it is determined whether the power key 21 is in the off state. At this time, the processing of steps 110 and 132 is repeatedly executed until the power key 21 is turned off. When the power key 21 is turned off, the CPU 17 proceeds to step 13.
In step 2, it is determined as "Yes", and in step 130, the execution of the program is terminated.

The vehicle ECU 10 and the motor ECU
If the communication with the CPU 31 is not normally performed, the CPU 17
Determines "No" in step 112, advances the program to step 126 and thereafter, and executes the program in the same manner as described above. That is, if the electric vehicle cannot travel, the LCD 41 is not lit.

As can be understood from the above description of operation, according to the above-described embodiment, if the electric vehicle is in a runnable state when the power key 21 is turned on, the vehicle speed, the shift position, the remaining battery power, etc. LCD4 for displaying status
Since the driver can be informed that the vehicle can run by setting itself to the display state, the visibility of the electric system diagnostic device for the electric vehicle can be improved. Further, in this case, a special vehicle running lamp and a drive circuit for controlling lighting / non-lighting of this lamp are not required. Therefore, the number of components can be reduced as compared with the related art, so that the electric system diagnostic device of the electric vehicle can be reduced in size and the manufacturing cost can be reduced.

If the parking brake is applied, the driver can be informed that the parking brake is applied by blinking only the speedometer display on the LCD 41, so that the electric system diagnosis of the electric vehicle can be performed. The visibility of the device can be improved. Further, in this case, there is no need for a parking brake lamp for displaying whether or not the parking brake is being applied and a drive circuit for controlling lighting / non-lighting of this lamp. Therefore, the number of components can be reduced as compared with the related art, so that the electric system diagnostic device of the electric vehicle can be reduced in size and the manufacturing cost can be reduced.

In the above embodiment, if the parking brake is applied, the driver is informed that the parking brake is applied by blinking only the speedometer display on the LCD 41. L
The CD 41 itself, that is, the shift position display and the remaining amount display of the high-voltage battery 34 may be simultaneously blinked to notify the driver that the parking brake is applied. With this, the same effect as in the above embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an entire electric system diagnostic apparatus for an electric vehicle according to an embodiment of the present invention.

FIG. 2 is a front view of the display device of FIG.

FIG. 3 is a flowchart corresponding to a program executed by the CPU of FIG. 1;

[Explanation of symbols]

10: ECU for vehicle, 11: input interface, 1
2 bus, 13 A / D conversion circuit, 14 communication interface, 15 output interface, 16 liquid crystal display (LCD) driver, 17 central processing unit (CPU), 18 read-only memory (ROM),
19 Watchdog circuit, 21 Power key, 22 Shift position switch, 23 Parking brake switch, 24 First accelerator sensor, 25 Second accelerator sensor, 31 ECU for motor, 32 Motor, 33
... Inverter, 34 ... High voltage battery, 35 ... Relay, 36 ... DC / DC converter, 37 ... Low voltage battery, 40 ... Display device, 41,42 ... LCD, 43 ... L
ED group, 43a: motor warning lamp, 43b: battery warning lamp, 43c: turn operation lamp, 43d: beam operation lamp.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H115 PG04 PI15 PI16 PI29 PO09 PU01 PV02 PV07 QN03 SJ12 TB01 TI02 TI05 TO01 TO21 TR04 TR19 TZ07 UB05 UB15 UB20

Claims (3)

[Claims] 1. An electric system diagnostic apparatus for an electric vehicle, comprising: a traveling possibility determination unit for determining whether the vehicle is in a traveling state. The vehicle status such as a vehicle speed, a shift position, and a remaining battery level is displayed. Display means; and display control means for setting the display means to a display state when the travelability determination means determines that the vehicle is in a runnable state, and for setting the display means to a non-display state in other cases. An electric system diagnostic apparatus for an electric vehicle. 2. The electric system diagnostic apparatus for an electric vehicle according to claim 1, wherein the drive enable determination unit includes a motor that drives a wheel when a power key that activates an electric system of the vehicle is on. An electric system diagnostic apparatus for an electric vehicle, characterized in that when the voltage of a battery, which is a power source of the vehicle, is in a normal range, the vehicle is determined to be in a runnable state. 3. An electric system diagnostic apparatus for an electric vehicle according to claim 1, wherein said parking brake determination means determines whether a parking brake is applied, and said parking brake. An electric system diagnostic apparatus for an electric vehicle, further comprising: a blink control unit that blinks the displayed display unit when the determination unit determines that the parking brake is applied.