vehicle controls

Abstract

The present invention can effectively utilize the electric energy of the vehicle, and can effectively prevent the premature deterioration of the second power storage device. The present invention is a control device for a vehicle that supplies electric power to electric loads of the vehicle, comprising: a first power storage device (3) capable of maintaining electric power for a long time; a second power storage device (6) capable of The device (3) charges and discharges faster; the ignition switch detection unit (24) detects the operating state of the ignition switch of the vehicle; the voltage detection unit (10) detects the voltage of the second power storage device (6); The discharge unit (25), when the ignition switch detection unit (24) detects that the ignition switch is turned off and the voltage detection unit (10) detects that the voltage of the second power storage device (6) is in advance If it exceeds the set reference value, the electric power stored in the second power storage device (6) is discharged.

Description

technical field [0001] The present invention relates to a vehicle control device that supplies electric power to electric loads of the vehicle, and includes a first power storage device that can hold electric power for a long period of time, and a second power storage device that can charge and discharge faster than the first power storage device. 2. Power storage device. Background technique [0002] Conventionally, as shown in the following patent document 1, there is known a control device for a vehicle, which includes: a secondary battery for high voltage, which mainly supplies power to a motor for driving the vehicle, and is composed of a lithium battery or the like; The secondary battery, which supplies power to auxiliary machines such as wipers and air conditioners, is composed of lead storage batteries; the power supply control unit operates the charging circuit connected to the high-voltage secondary battery to charge the above-mentioned low-voltage secondary batter...

AI Technical Summary

Problems solved by technology

[0007] However, when the above-mentioned ignition circuit is turned off, when it is determined that the low-voltage secondary battery does not need to be charged, there is a problem that the high-voltage secondary battery does not need to be charged because the power supply from the high-voltage secondary battery to the low-voltage secondary battery is not performed. The secondary battery is in a state where its voltage is maintained at a high value, so the secondary battery for high voltage is prone to premature deterioration

That is, capacitors (capacitors) such as electric double layer capacitors or lithium ion capacitors that can absorb a large current supplied from an alternator instantaneously when the vehicle decelerates are widely used as power storage devices for vehicle deceleration regeneration systems. Compared with low-voltage secondary batteries such as lead-acid batteries, it can set the upper limit of the charging voltage to a very high value, such as 25V or more, and physically absorbs charges. Therefore, it has the following characteristics: If the ignition circuit is turned off The situation that the voltage of the high-voltage secondary battery composed of the above-mentioned capacitor and the like is maintained at a high value frequently occurs after operation, and the above-mentioned high-voltage secondary battery is liable to be deteriorated prematurely.

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