FAILURE DETECTION DEVICE FOR VEHICLE

• US 20120330487A1
• Filed: 06/22/2012
• Published: 12/27/2012
• Est. Priority Date: 06/23/2011
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: NAKAMURA, Makoto, SOMA, Takaya, SHIMANA, Tomoko
• Granted Patent: US 8,965,612 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60L 3/0038 relating to sensors
• CPC Class Codes: B60L 3/0061 relating to electrical machines

Abstract

A failure detection device for a vehicle that detects a failure of a motor system includes a controller that changes a sensitivity for detection of a failure in the motor system in accordance with at least one of an operational condition of the motor system and a situation in which the motor system is operating.

Claims

1. A failure detection device for a vehicle that detects a failure of a motor system, comprising:

a controller that changes a sensitivity for detection of a failure in the motor system in accordance with at least one of an operational condition of the motor system and a situation in which the motor system is operating.

2. The failure detection device according to claim 1, wherein the controller decreases the sensitivity for detection of a failure when the motor system is in the same operational condition as an operational condition in which a fail-safe function has been executed in response to detection of a failure in the motor system,

3. The failure detection device according to claim 2, wherein the operational condition in which the fail-safe function has been executed is an operational condition in which an inverter included in the motor system is in a shutdown state.

4. The failure detection device according to claim 1, wherein the controller changes a sensitivity for detection of an offset failure in a current sensor that detects a motor current, in accordance with a motor rotational speed.

5. The failure detection device according to claim 1, wherein the controller sets a sensitivity for detection of a failure in a resolver that detects a motor rotational angle, to a higher level when the resolver has an interphase short-circuit than when the resolver has no interphase short-circuit.

6. The failure detection device according to claim 1, wherein the controller changes the sensitivity for detection of a failure according to whether or not a parking lock is in operation.

7. The failure detection device according to claim 1, wherein the controller changes the sensitivity for detection of a failure by changing a failure determination criterion.