DISCHARGE CONTROL DEVICE

• US 20160064956A1
• Filed: 07/16/2015
• Published: 03/03/2016
• Est. Priority Date: 08/28/2014
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Keihin Corporation (Hitachi, Ltd.)
• Inventors: Minesawa, Ryutaro
• Granted Patent: US 10,245,956 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 2240/427 Voltage
• CPC Class Codes: B60L 2240/527 Voltage
• CPC Class Codes: B60L 3/0007 Measures or means for preventing or attenuating collisions
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A discharge control device controls a discharge bypass circuit for discharging a charge in a capacitor provided in a drive device for a motor that rotates wheels of a vehicle at time of a collision of the vehicle. The discharge control device includes a control circuit that makes the discharge bypass circuit start discharge if an induced voltage by the motor surpasses a predetermined threshold.

Claims

1. A discharge control device that controls a discharge bypass circuit for discharging, at time of a collision of a vehicle, a charge in a capacitor provided in a drive device for a motor that rotates wheels of the vehicle, the discharge control device comprising

a control circuit that makes the discharge bypass circuit start discharge if an induced voltage induced by the motor surpasses a predetermined threshold.

2. The discharge control device according to claim 1, wherein the control circuit has

a flip-flop circuit that outputs an output signal that is a discharge instruction to the discharge bypass circuit at the time of the collision of the vehicle and resumes output of the output signal when a reset release signal is input to the flip-flop circuit even if the output of the output signal is stopped, and

a reset control circuit that outputs the reset release signal to the flip-flop circuit if the induced voltage induced by the motor surpasses the predetermined threshold.

3. The discharge control device according to claim 1, wherein the drive device supplies power to the motor and the discharge control device.

4. The discharge control device according to claim 3, wherein the drive device is electrically connected to the motor and the discharge control device.

5. The discharge control device according to claim 4, wherein the discharge bypass circuit discharges the induced voltage.

6. The discharge control device according to claim 2, wherein the flip-flop circuit stops output of the output signal when a reset signal is input to the flip-flop circuit.

7. The discharge control device according to claim 2, wherein the reset control circuit is connected to a power line connected between the drive device and the discharge control device, and

the drive device supplies power to the discharge control device via the power line and to the motor.

8. A vehicle comprises the discharge control device according to claim 1.