JP2002354602A - High-voltage system block device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the traveling of a vehicle by promptly blocking a power supply when the vehicle comes into collision and without blocking the power supply when the vehicle does not actually come into collision, relating to a high-voltage system block device for an automobile. SOLUTION: The block device comprises: a collision detecting means 11 that detects a collision of the automobile that obtains a travel drive force from a high-voltage power supply 2; a reduced-speed detecting means 12 that detects a reduced speed of the automobile; and a high-voltage system block control means 13 that blocks a circuit 5 of the high-voltage power supply 2 upon receiving a collision detecting signal from the collision detecting means 11, and controls the circuit 5 of the blocked high-voltage power supply 2 so as to be reconnected when the reduced speed detected by the reduced-speed detecting means 12 does not exceed a prescribed value within a prescribed period after receiving the collision detecting signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage system shut-off device for shutting off a high-voltage electric system in an emergency in an automobile such as an electric vehicle having a high-voltage source.

[0002]

2. Description of the Related Art In an electric vehicle, the driving force of the vehicle is obtained from a power source having a significantly higher voltage (several hundred volts) than a battery (generally 12 volts) mounted on a normal vehicle. For this reason, in electric vehicles, measures are required to prevent the occurrence of vehicle fires, electric shocks, and the like due to the high voltage source applied in the event of a collision, and various technologies have been proposed.

[0003] For example, Japanese Utility Model Laid-Open No. 61-202101,
2. Description of the Related Art In an electric vehicle, a technology is disclosed in which when a collision of a vehicle is detected, power supply from a power supply to a driving device is cut off. Japanese Patent Application Laid-Open No. 09-284901 discloses that when an electric vehicle equipped with a plurality of batteries collides, the batteries are separated to prevent high-voltage leakage, and furthermore, when the damage situation of the vehicle is minimal. Discloses a technique of connecting a battery again to enable traveling.

[0004]

However, since a sensor for detecting a collision of a vehicle judges a collision by an impact applied to the sensor itself, even if a collision of the vehicle does not actually occur, the collision occurs. May be determined. In such a case, the power supply from the power supply is cut off based on the sensor information even though the vehicle can be driven, and the driving device for driving stops, so that the vehicle cannot be driven and the vehicle stops on the spot. become.

Although not related to electric vehicles, there is a technique disclosed in Japanese Patent Application Laid-Open No. 06-316242. This technology is used in a high-speed vehicle such as a competition car to prevent the electric circuit (not high voltage) from short-circuiting at the time of collision of the vehicle and overheating and igniting the fuel leaked into the vehicle. This technology shuts off the power supply circuit. Simply shutting off the power supply circuit only on the condition of a vehicle collision makes it impossible to control the running vehicle, so in such technology, the power supply circuit is shut off after the vehicle stops at the time of the vehicle collision. Until the vehicle stops after the collision of the vehicle, the vehicle can be controlled using the power supply circuit.

When the vehicle actually collides, the vehicle stops thereafter. If the power is cut off based on both conditions of the collision and the stop of the vehicle, the collision of the vehicle is more accurately determined and the power is cut off. be able to. However, in the case of a vehicle equipped with a high-voltage power supply such as an electric vehicle, there is a risk of not only a fire but also an electric shock. Therefore, it is desired to cut off the power supply to the power supply as soon as possible in the event of a collision of the vehicle. In this regard, the technology disclosed in the above publication does not shut off the power supply until the vehicle stops, so that traveling performance can be ensured, but an occupant or the like may get an electric shock before the vehicle stops. Of course, it is necessary to appropriately determine whether or not the vehicle has actually collided, and to avoid a situation in which the vehicle cannot travel even though the vehicle has not actually collided.

The present invention has been devised in view of the above-mentioned problems. The power supply is quickly cut off when a vehicle collides, and the power supply is not cut off when the vehicle does not actually collide. An object of the present invention is to provide a high-voltage circuit breaker for an automobile, which can ensure traveling performance.

[0008]

In order to achieve the above-mentioned object, in a high-voltage circuit breaker for a vehicle according to the present invention (claim 1), a collision detection means detects a collision of a vehicle which obtains a driving force from a high-voltage power supply. Is detected, the circuit of the high-voltage power supply is cut off by the high-voltage system cutoff control means, and the deceleration of the vehicle detected by the deceleration detection means within a predetermined period from the time when the collision detection signal is received is equal to the predetermined value. If the value does not exceed the value, the circuit of the interrupted high-voltage power supply is reconnected by the high-voltage system interruption control means.

Therefore, when it is determined that a collision of the vehicle has occurred, the circuit of the high-voltage power supply is immediately shut off, thereby avoiding a problem caused by energization of the high-voltage power supply. In addition, when the deceleration does not exceed a predetermined value, the circuit of the high-voltage power supply is reconnected, so that the collision of the automobile was not actually caused and the circuit of the high-voltage power supply was cut off by the malfunction of the collision detection means. In this case as well, it is possible to ensure the driving power of the car thereafter.

Further, in the high-voltage circuit breaker for a vehicle according to the present invention (claim 2), the collision detecting means detects a collision of the vehicle which obtains a driving force from the high-voltage power supply, and outputs the collision detection signal. When the deceleration of the vehicle detected by the deceleration detecting means has become equal to or more than a predetermined value within a predetermined period from the time of receipt, the circuit of the high voltage power supply is cut off by the high voltage system cutoff control means.

Therefore, the collision of the vehicle can be determined with high accuracy, and the circuit of the high-voltage power supply is immediately cut off at the time of the collision of the vehicle, thereby avoiding a problem caused by the energization of the high-voltage power supply. Further, since the accuracy of the vehicle collision determination is high, when there is no actual vehicle collision, the connection of the circuit of the high-voltage power supply is maintained, and the driving force of the vehicle can be secured.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a high-voltage circuit breaker for a vehicle according to a first embodiment of the present invention. FIG. 1 is a block diagram showing the main configuration of the vehicle and the high-voltage circuit breaker. FIG. 3 is a flowchart showing the operation of the high-voltage system cutoff device.

The vehicle according to the present embodiment is an electric vehicle that obtains a driving force from a high-voltage power supply of, for example, several hundred volts. As shown in FIG. 1, a driving motor 1 for rotating driving wheels is provided. I have it. This motor 1
In order to supply power to the main battery 2, for example, a large number of 12 volt batteries are connected in series, a main contactor 3 connected to the main battery 2, and a main contactor 3 and the motor 1 are interposed. The motor controller 4 is provided.

Therefore, the motor 1 is controlled by the motor controller 4 and is rotated by the power of the main battery 2 supplied through the main contactor 3. The main battery 2 corresponds to a high-voltage power supply, and the main battery 2, the main contactor 3, the motor controller 4, the motor 1, and a circuit from the main battery 2 to the motor controller 4 via the main contactor 3 High voltage system 6 collectively
I will call it.

The high-voltage cutoff device 10 includes a collision detection sensor (collision detection means) 11 for detecting the collision of the vehicle.
A deceleration detecting means 12 for detecting the deceleration of the vehicle;
A collision detection power cutoff ECU (high voltage system cutoff control means) 13 for controlling the cutoff of the circuit 5 of the high voltage power supply 2 based on the detection information from the collision detection means 11 and the deceleration detection means 12 is provided.

As the collision detection sensor 11, for example, an acceleration sensor using a piezo element or the like or an engineering sensor combining an optical fiber and a light emitting element can be applied, but the collision detection sensor 11 is not particularly limited to these. Further, the existing collision detection sensor may be used by directly using the information from the collision detection sensor provided for the airbag or via the airbag ECU. Deceleration detecting means 1
2 is a vehicle speed sensor 12a and the vehicle speed sensor 12
deceleration calculating section 1 for calculating deceleration from a vehicle speed signal from a
2b, an acceleration sensor that detects the acceleration in the traveling direction of the vehicle over a wide range may be used.

Upon receiving a collision detection signal from the collision detection sensor 11, the ECU 13 shuts off the circuit 5 of the high-voltage power supply 2 through the main contactor 3 and, at the same time, receives a collision detection signal from the collision detection sensor 11. If the deceleration detected by the deceleration detecting means 12 does not become equal to or more than the predetermined value within a predetermined period, the control is performed so that the circuit 5 of the high-voltage power supply 2 interrupted through the main contactor 3 is reconnected.

Since the high-voltage system cutoff device as the first embodiment of the automobile of the present invention is configured as described above, the high-voltage system cutoff control is performed as shown in FIGS. 2 and 3, for example. As shown in the main routine of FIG. 2, when the key switch of the drive system of the automobile is turned on, the main contactor 3 is turned on (step a10), the collision estimation flag is cleared (step a20), and the interruption is permitted. (Step a30).

With this interruption permission, a deceleration determination routine as shown in FIG. 3 is periodically performed. That is,
As shown in FIG. 3, the deceleration calculating section 12b of the deceleration detecting means 12 receives the vehicle speed signal from the vehicle speed sensor 12a (step b10), calculates the vehicle speed from this vehicle speed signal (step b20), and further calculates The deceleration is calculated based on the vehicle speed (step b30). The collision detection power cutoff ECU 13 determines whether the calculated deceleration is equal to or greater than a preset value (predetermined value) (step b4).
0) If the calculated deceleration is equal to or greater than the set value, a collision estimation flag is set (step b50). Note that such set values are set in advance based on experiments and the like.

Referring again to the main routine of FIG.
After interrupt permission (step a30), it is determined whether or not the key switch is on (step a40). If the key switch is not on (ie, if the key switch is turned off), the main contactor 3 is turned off. The control is turned off (step a50) to end the control. If the key switch is on, it is determined whether collision detection information has been input from the collision detection sensor 11 (that is, whether the collision detection sensor 11 is on) (step a60).

If the collision detection information is not input from the collision detection sensor 11, the process returns to step a40. The determination in step a40 is performed at a predetermined cycle. On the other hand, if the collision detection information is input from the collision detection sensor 11, it is provisionally determined that the vehicle has collided, and the main contactor 3 is turned off (step a70). Further, it is determined whether or not the collision estimation flag is set in the deceleration determination routine (FIG. 3) (step a80). If the collision estimation flag is set, it is determined that the vehicle has collided, and the main contactor 3 is kept off. Then, it is determined whether the key switch is in the off state (step a).
When the key switch is turned off by (90), the control is terminated. The determination in step a90 is also made at a predetermined cycle.

If the collision estimation flag is not set after the main contactor 3 is turned off by the provisional determination that the vehicle has collided, the collision estimation flag is set after the vehicle collision is detected (after the collision detection sensor 11 is turned on). It is determined whether or not a predetermined time (here, 1 second) has elapsed without being performed (step a100). If the collision estimation flag is not set within a predetermined time after the detection of the collision of the vehicle, it is determined that the collision of the vehicle is erroneous, the main contactor 3 is turned on (step a110), and a step a4 is performed.
Return to 0.

In this manner, the collision detection power cut-off ECU
In 13, when collision detection information is input from the collision detection sensor 11, the main contactor 3 is turned off and the circuit 5 of the high-voltage power supply 2 is cut off immediately after provisionally determining that the vehicle has collided. It is possible to prevent a vehicle fire, an electric shock, or the like from occurring due to energization of the voltage power supply.

Further, if the deceleration does not exceed a predetermined value within a predetermined time after the provisional determination that the vehicle has collided, the provisional determination that the vehicle has collided is erroneous. Turn on the main contactor 3 and turn on the high-voltage power supply 2
Since the circuit 5 is reconnected, even when the circuit of the high-voltage power supply is cut off due to the malfunction of the collision detection sensor 11,
Then, it becomes possible to secure the driving power of the automobile.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a flowchart showing the operation of the high-voltage system cutoff device for an automobile according to the second embodiment of the present invention. Since the hardware configuration of the vehicle and the high-voltage system cutoff device according to the present embodiment is the same as that of the first embodiment, a description thereof will be omitted, and a software configuration different from that of the first embodiment will be described.

In the present embodiment, it is determined whether or not the collision vehicle has collided by determining that the collision detection sensor 11 is turned on (that is, the collision detection sensor 11 has detected the collision of the vehicle), It is determined from both conditions that the deceleration detected (calculated) by the deceleration detecting means 12 becomes equal to or more than a predetermined value within a predetermined time after the detection sensor 11 is turned on. Then, in the collision detection power supply cutoff ECU 13,
When both conditions are satisfied, the main contactor 3 is turned off and the circuit 5 of the high-voltage power supply 2 is cut off.

Since the high-voltage cutoff device as the second embodiment of the present invention is configured as described above, the high-voltage cutoff control is performed, for example, as shown in FIG. In FIG. 4, the same reference numerals as those in FIG. 2 indicate the same processing steps. Also in the present embodiment, the deceleration determination routine shown in FIG. 3 is performed by permitting the interrupt (step a30 in the figure).

As shown in the main routine of FIG. 4, when the key switch of the drive system of the automobile is turned on, the main contactor 3 is turned on (step a10), the collision estimation flag is cleared (step a20), and the interruption is performed. Permission (step a30) is performed, and the deceleration determination routine shown in FIG. 3 is performed. After interrupt permission (step a30), it is determined whether or not the key switch is on (step a40). If the key switch is not on (ie, if the key switch is turned off), the main contactor 3 is turned off. The control is turned off (step a50) to end the control. If the key switch is on, whether collision detection information has been input from the collision detection sensor 11 (that is, the collision detection sensor 1
It is determined whether or not 1 is on) (step a60).

Here, if the collision detection information is not input from the collision detection sensor 11, the process returns to step a40. The determination in step a40 is performed at a predetermined cycle. On the other hand, if the collision detection information is input from the collision detection sensor 11, it is determined whether or not the collision estimation flag is set in the deceleration determination routine (FIG. 3) (step a8).
0). Here, if the collision estimation flag is set,
It is determined that the vehicle has collided, and the main contactor 3 is turned off (step a82). When the key switch is turned off by the determination (step a90) as to whether or not the key switch is off, the control is ended. The determination in step a90 is also made at a predetermined cycle.

If it is determined in step a80 that the collision estimation flag has not been set, the process proceeds to step a100, and after the collision of the vehicle is detected (after the collision detection sensor 11 is turned on).
It is determined whether a predetermined time (here, 1 second) has elapsed. If the predetermined time has not elapsed after the detection of the collision of the vehicle, the process returns to step a80. If the collision estimation flag is set within the predetermined time after the detection of the collision of the vehicle, it is determined that the vehicle has collided and the main contactor is determined. 3 is turned off (step a82).

On the other hand, if the collision estimation flag is not set within a predetermined time after the vehicle collision is detected, the collision detection sensor 11
Is detected as an erroneous detection and no collision of the vehicle is detected, the main contactor 3 is kept on, and the process returns from step a100 to step a40. In this manner, in the collision detection power cutoff ECU 13, the collision detection information is input from the collision detection sensor 11, and the collision estimation flag is set within a predetermined time after the collision detection information is input from the collision detection sensor 11. (That is, the deceleration of the vehicle has become equal to or more than a predetermined value), and the main contactor 3 is controlled by determining that the vehicle has collided. Main contactor 3 only when a vehicle collision occurs
Is turned off, the circuit 5 of the high-voltage power supply 2 can be cut off.

Therefore, it is possible to prevent a risk of a vehicle fire or an electric shock caused by the high-voltage power supply being energized at the time of the collision, and to accurately determine the collision of the vehicle. It is possible to prevent a situation in which the circuit of the high-voltage power supply is interrupted due to erroneous determination, and to secure the driving force of the vehicle. In addition,
The present invention is not limited to the above embodiments,
Various modifications are possible without departing from the spirit of the present invention.

[0033]

As described above, according to the high-voltage system shut-off device for a vehicle according to the present invention (claim 1), when it is determined that the vehicle has collided, the circuit of the high-voltage power supply is immediately cut off, Vehicle fires, electric shocks, and the like that can occur due to the high voltage source can be reliably prevented.

If the deceleration does not exceed the predetermined value, the circuit of the high-voltage power supply is reconnected. Therefore, the collision of the automobile is not actually caused, and the circuit of the high-voltage power supply is not operated due to the malfunction of the collision detection means. Even when the vehicle is shut off, it is possible to secure the driving power of the vehicle thereafter, and it is possible to avoid a situation in which the vehicle cannot be driven due to a malfunction of the collision detection means.

Further, according to the high-voltage system cut-off device for a vehicle according to the present invention, the collision detection means can determine the collision of the vehicle with high accuracy, and immediately upon the collision of the vehicle, the high-voltage power supply Is cut off, and a vehicle fire, an electric shock, or the like, which may occur due to the high voltage source at the time of the collision, can be reliably prevented. In addition, since the accuracy of the vehicle collision determination is high, if there is no actual vehicle collision, the connection of the circuit of the high-voltage power supply is maintained,
The driving power of the vehicle can be ensured, and a situation in which the vehicle cannot be driven due to malfunction of the collision detection means can be avoided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main configuration of an automobile and an automobile high-voltage system cutoff device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a main routine showing an operation of the high-voltage disconnection device for a vehicle according to the first embodiment of the present invention.

FIG. 3 is a flowchart of a subroutine showing an operation of the high-voltage system cutoff device of the automobile according to the first embodiment of the present invention.

FIG. 4 is a flowchart of a main routine showing an operation of a high-voltage system cutoff device for an automobile according to a second embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 traveling motor 2 main battery (high voltage power supply) 3 main contactor 4 motor controller 5 high voltage power supply circuit 6 high voltage system 10 high voltage system cutoff device 11 collision detection sensor (collision detection means) 12 deceleration detection means 12a vehicle speed sensor 12b Deceleration calculation unit 13 Collision detection power supply cutoff ECU (high voltage system cutoff control means)

Claims (2)

[Claims] 1. A collision detection means for detecting a collision of an automobile which obtains a driving force from a high voltage power supply, a deceleration detection means for detecting a deceleration of the automobile, and receiving a collision detection signal from the collision detection means. If the deceleration detected by the deceleration detecting means does not exceed a predetermined value within a predetermined period from the time when the collision detection signal is received, the circuit is shut off. A high-voltage system cut-off device for an automobile, comprising: a high-voltage system cut-off control means for controlling the reconnected high-voltage power supply circuit. 2. A collision detecting means for detecting a collision of an automobile which obtains a driving force from a high voltage power supply, a deceleration detecting means for detecting a deceleration of the automobile, and receiving a collision detection signal from the collision detecting means. And controlling the circuit of the high-voltage power supply to be cut off on condition that the deceleration detected by the deceleration detecting means has become equal to or greater than a predetermined value within a predetermined period from the time when the collision detection signal is received. A high-voltage system cut-off device for an automobile, comprising: