ABNORMALITY DIAGNOSTIC APPARATUS FOR VEHICLE

• US 20140195097A1
• Filed: 01/07/2014
• Published: 07/10/2014
• Est. Priority Date: 01/08/2013
• Status: Active Grant

• Current Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Original Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Inventors: YAMANAKA, Yasuhiro, NONAKA, Takashi
• Granted Patent: US 9,381,815 B2
• Time in Patent Office: Days
• US Class Current: 701/29.1
• CPC Class Codes: B60L 2220/42 with use of more than one motor
• CPC Class Codes: B60L 2240/527 Voltage
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 2260/28 Four wheel or all wheel drive
• CPC Class Codes: B60L 3/0023 Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y10S 903/903 having energy storing means, e.g. battery, capacitor

Abstract

An abnormality diagnostic apparatus for a vehicle, which can accurately determine whether or not there is an abnormality in a voltage detection unit, while curtailing a cost increase, is provided. Output voltages Va, Vb, Vc outputted from voltage detection units are acquired, and differences |Va−Vb|, |Vb−Vc|, |Vc−Va| between the acquired output values are calculated. If any of the calculation results is greater than a determination threshold value, it is determined that there is an abnormality in any of the voltage detection units.

Claims

1. An abnormality diagnostic apparatus for a vehicle, comprising:

a battery loaded on a vehicle;

a plurality of rotating electric machines electrically connected to the battery;

a plurality of rotating electric machine control units for controlling the rotating electric machines;

a plurality of voltage detection units, provided in the rotating electric machine control units, for detecting voltages of power lines connecting the battery and the rotating electric machines;

a difference calculation unit for acquiring output values outputted from the voltage detection units and calculating differences between the acquired output values; and

an abnormality determination unit which, when any of results of calculations by the difference calculation unit is greater than a preset determination threshold value, determines that there is an abnormality in any of the voltage detection units.

2. The abnormality diagnostic apparatus for a vehicle according to claim 1, wherein

any of the plurality of voltage detection units is provided in such a manner as to be common to any of the plurality of rotating electric machine control units.

3. The abnormality diagnostic apparatus for a vehicle according to claim 1, wherein

the abnormality determination unit determines whether or not there is an abnormality in the voltage detection unit, on condition that a shift range selected by a transmission, which the vehicle has, is a parking range or a neutral range.

4. The abnormality diagnostic apparatus for a vehicle according to claim 2, wherein

the abnormality determination unit determines whether or not there is an abnormality in the voltage detection unit, on condition that a shift range selected by a transmission, which the vehicle has, is a parking range or a neutral range.

5. The abnormality diagnostic apparatus for a vehicle according to claim 1, wherein

the abnormality determination unit determines whether or not there is an abnormality in the voltage detection unit, on condition that a shift range selected by a transmission, which the vehicle has, is a drive range, and that the rotating electric machine control unit is stopping.

6. The abnormality diagnostic apparatus for a vehicle according to claim 2, wherein

the abnormality determination unit determines whether or not there is an abnormality in the voltage detection unit, on condition that a shift range selected by a transmission, which the vehicle has, is a drive range, and that the rotating electric machine control unit is stopping.

7. The abnormality diagnostic apparatus for a vehicle according to claim 1, further comprising

a threshold value correction unit for making a correction for decreasing the determination threshold value in accordance with a state of the battery.

8. The abnormality diagnostic apparatus for a vehicle according to claim 2, further comprising

a threshold value correction unit for making a correction for decreasing the determination threshold value in accordance with a state of the battery.

9. The abnormality diagnostic apparatus for a vehicle according to claim 3, further comprising

a threshold value correction unit for making a correction for decreasing the determination threshold value in accordance with a state of the battery.

10. The abnormality diagnostic apparatus for a vehicle according to claim 4, further comprising

a threshold value correction unit for making a correction for decreasing the determination threshold value in accordance with a state of the battery.

11. The abnormality diagnostic apparatus for a vehicle according to claim 5, further comprising

a threshold value correction unit for making a correction for decreasing the determination threshold value in accordance with a state of the battery.

12. The abnormality diagnostic apparatus for a vehicle according to claim 6, further comprising

a threshold value correction unit for making a correction for decreasing the determination threshold value in accordance with a state of the battery.