HYBRID VEHICLE CONTROL APPARATUS

• US 20180148044A1
• Filed: 11/28/2017
• Published: 05/31/2018
• Est. Priority Date: 11/29/2016
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: KOBAYASHI, Nobufusa
• Application Number:
  US15/824,112
• Publication Number:
  US 20180148044A1
• Time in Patent Office: Days
• CPC Class Codes: B60K 2025/005 driven by electric motors forming part of the propulsion unit
• CPC Class Codes: B60K 2025/022 by a mechanical transmission
• CPC Class Codes: B60K 25/02 directly from an engine shaft
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• 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 2050/0297 Control Giving priority to different actuators or systems
• CPC Class Codes: B60W 50/029 Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
• CPC Class Codes: B60Y 2200/92 Hybrid vehicles
• CPC Class Codes: F16H 2061/1224 Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
• CPC Class Codes: F16H 2061/1264 Hydraulic parts of the controller, e.g. a sticking valve or clogged channel
• CPC Class Codes: F16H 61/0031 using auxiliary pumps, e.g. pump driven by a different power source than the engine
• CPC Class Codes: F16H 61/12 Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A control apparatus (80) for a hybrid vehicle (10; 200) provided with: a drive power source including an engine (14; 202) and a vehicle driving electric motor (MG2; MG); an automatic transmission (20; 210) having hydraulically operated coupling devices (CB); and a hydraulic pressure source for the coupling devices, which includes a mechanically operated oil pump (100) operated by the engine, and an electrically operated oil pump (104) operated by a pump driving electric motor (102), the automatic transmission having speed positions having respective different speed ratio values and established with engaging actions of the selected coupling devices through solenoid-operated valves (SL), the coupling devices being operated by hydraulic pressures generated by the electrically operated oil pump, in a motor drive mode in which the vehicle is driven by the vehicle driving electric motor while the engine is at rest. The control apparatus includes: an abnormality detecting portion (92) for detecting an abnormality of the engaging action of the coupling devices to establish one of the speed positions in which the vehicle is started in the motor drive mode; an emergency engine starting portion (94) for starting the engine to operate the mechanically operated oil pump when the abnormality is detected; and a temporary engagement canceling portion (98) for controlling the solenoid-operated valve for the above-indicated one coupling device such that the coupling device is brought into its released state, upon starting of the engine, the temporary engagement canceling portion controlling the solenoid-operated valve to restore the above-indicated one coupling device to its engaged state after starting of the engine.

Claims

1. A control apparatus for a hybrid vehicle provided with:

a drive power source including an engine and a vehicle driving electric motor;

an automatic transmission having a plurality of hydraulically operated coupling devices; and

a hydraulic pressure source for the hydraulically operated coupling devices, which includes a mechanically operated oil pump operated by the engine, and an electrically operated oil pump operated by a pump driving electric motor, the automatic transmission having a plurality of speed positions having respective different values of a speed ratio of its output speed with respect to its input speed, which speed positions are established with engaging actions of selected ones of the hydraulically operated coupling devices through solenoid-operated valves, the hydraulically operated coupling devices being operated by hydraulic pressures generated by the electrically operated oil pump, in a motor drive mode in which the hybrid vehicle is driven by the vehicle driving electric motor while the engine is at rest, said control apparatus comprising;

an abnormality detecting portion configured to detect an abnormality of a power transmitting state of the automatic transmission due to an abnormality of the engaging action of one of the hydraulically operated coupling devices which is operated to establish one of the speed positions of the automatic transmission in which the hybrid vehicle is started in the motor drive mode;

an emergency engine starting portion configured to start the engine to operate the mechanically operated oil pump, when the abnormality of the power transmitting state of the automatic transmission is detected by the abnormality detecting portion; and

a temporary engagement canceling portion configured to control the solenoid-operated valve for said one hydraulically operated coupling device placed in its engaged state to establish said one speed position, such that said one hydraulically operated coupling device is brought into its released state, upon starting of the engine by the emergency engine starting portion, the temporary engagement canceling portion controlling the solenoid-operated valve to restore said one hydraulically operated coupling device to its engaged state after starting of the engine.

2. The control apparatus according to claim 1, further comprising an abnormality cause determining portion configured to determine that the abnormality of the power transmitting state of the automatic transmission is caused by a defect of the electrically operated oil pump, where the abnormality is removed by starting of the engine by the emergency engine starting portion.