Failure diagnosis apparatus of hybrid vehicle

• US 9,428,180 B2
• Filed: 03/13/2013
• Issued: 08/30/2016
• Est. Priority Date: 03/16/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Fukui, Keita, Fushiki, Shunsuke, Yamazaki, Makoto
• Primary Examiner(s): MANCHO, RONNIE M
• Application Number:
  US14/384,042
• Publication Number:
  US 20150032326A1
• Time in Patent Office: 1,266 Days
• Field of Search: 701/32.1, 701/29, 701/34, 701/45, 701/1, 701/22, 701/29.1, 701/31.9, 701/31.8, 702/183, 702/184, 702/185, 180/65.1, 180/65.21, 180/65.31, 180/69.6
• US Class Current: 1/1
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 1/006 to power outlets
• 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 50/10 using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60W 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2050/0083 Setting, resetting, calibration
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/068 Engine exhaust temperature
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 50/0098 Details of control systems ensuring comfort, safety or stability not otherwise provided for
• CPC Class Codes: F02D 2200/021 Engine temperature
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F02D 41/2429 Methods of calibrating or learning
• CPC Class Codes: F02N 11/04 the motors being associated with current generators
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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 903/902 : Prime movers comprising electrical and internal combustion motors

Abstract

A failure diagnosis apparatus comprises a controller that is configured to execute a failure diagnosis process of the internal combustion engine based on a predetermined diagnosis requirement. The diagnosis requirement in a case where engine-operation-electric-power supply is executed is made different from the diagnosis requirement in a case where engine-normal-operation is executed such that a failure of the internal combustion engine in the case where the engine-operation-electric-power supply is executed is less likely to be detected or the failure of the internal combustion engine is less likely to be recognized by a driver than in the case where the engine-normal operation is executed.

Claims

1. A failure diagnosis apparatus of a hybrid vehicle including an internal combustion engine, a rotary electric machine that generates electric power by using power of the internal combustion engine, an electric power storage device, and an electric power supply device that supplies the electric power generated by the rotary electric machine and electric power stored in the electric power storage device to power receiving equipment outside the vehicle, the failure diagnosis apparatus comprising:

a controller that is configured to execute a first failure diagnosis process of the internal combustion engine based on a first diagnosis requirement in a case where engine-operation-electric-power supply is executed in which the internal combustion engine is operated to cause the rotary electric machine to generate electric power and the generated electric power is supplied to the power receiving equipment via the electric power supply device,

the controller being configured to execute a second failure diagnosis process of the internal combustion engine based on a second diagnosis requirement in a case where engine-normal-operation is executed in which the internal combustion engine is operated and the rotary electric machine does not generate the electric power to be supplied to the power receiving equipment,

wherein a failure of the internal combustion engine in the first failure diagnosis process of the internal combustion engine is less likely to be detected or the failure of the internal combustion engine in the first failure diagnosis process of the internal combustion engine is less likely to be recognized by a driver than the failure of the internal combustion engine in the second failure diagnosis process of the internal combustion engine.

2. The failure diagnosis apparatus of a hybrid vehicle according to claim 1, wherein

the controller is configured to select the first diagnosis requirement at a time that the engine-operation-electric-power supply is being executed.

3. The failure diagnosis apparatus of a hybrid vehicle according to claim 2, wherein

in a case where emergency electric power supply is requested at a time that the engine-operation-electric-power supply is being executed, the controller is configured to select the first diagnosis requirement such that the failure of the internal combustion engine is less likely to be detected or the failure of the internal combustion engine is less likely to be recognized by the driver than in a case where the emergency electric power supply is not requested.

4. The failure diagnosis apparatus of a hybrid vehicle according to claim 2 wherein

the controller is configured to determine presence or absence of an execution history of the engine-operation-electric-power supply, wherein

in a case where the execution history is present at a time that the second failure diagnosis process is executed at the time of the engine-normal-operation, the controller is configured to select the first diagnosis requirement such that the failure of the internal combustion engine is less likely to be detected or the failure of the internal combustion engine is less likely to be recognized by the driver than in a case where the execution history is absent.

5. The failure diagnosis apparatus of a hybrid vehicle according to claim 4 wherein

the controller is configured to acquire a state value indicative of a warm-up state of the internal combustion engine,

the controller is configured to acquire a learned value related to a learning process for learning a state of the internal combustion engine;

and

the controller is configured to prohibit the selection of the first diagnosis requirement based on the state value and the learned value in the case where the execution history is present.

6. The failure diagnosis apparatus of a hybrid vehicle according to claim 5, wherein

the controller is configured to prohibit the selection of the first diagnosis requirement in a case where the state value is a value corresponding to a cold state of the internal combustion engine and a difference between the learned value in the case where the execution history is absent and the acquired learned value is not more than a predetermined value.

7. The failure diagnosis apparatus of a hybrid vehicle according to claim 2, wherein

the controller is configured to execute at least one of a first measure in which an execution frequency of the failure diagnosis process is reduced, a second measure in which a determination criterion for determining whether or not the internal combustion engine has the failure is relaxed, a third measure in which notification of detection of the failure of the internal combustion engine to the driver is restricted, and a fourth measure in which storage of a history of the detection of the failure of the internal combustion engine is restricted.