HYBRID MOTOR VEHICLE AND METHOD OF CONTROLLING HYBRID MOTOR VEHICLE

• US 20110120789A1
• Filed: 11/22/2010
• Published: 05/26/2011
• Est. Priority Date: 11/20/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Teraya, Ryuta
• Granted Patent: US 8,579,059 B2
• Time in Patent Office: Days
• US Class Current: 180/65.25
• CPC Class Codes: B60K 17/354 having separate mechanical assemblies for transmitting drive to the front or to the rear wheels or set of wheels
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 2260/12 of combustion engines
• CPC Class Codes: B60L 2260/26 Transition between different drive modes
• 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: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 2710/0616 Position of fuel or air injector
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: Y02T 10/40 Engine management systems
• 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

Abstract

A hybrid motor vehicle includes: an internal combustion engine that outputs motive power for vehicle traction; an engine-motoring electric motor that motors the internal combustion engine; a vehicle traction electric motor that outputs motive power for vehicle traction; a secondary battery that supplies electric power to the engine-motoring electric motor and to the vehicle traction electric motor; and a pre-engine-start control device that controls the internal combustion engine and the engine-motoring electric motor so as to motor the internal combustion engine in a reverse rotation direction without performing fuel injection or ignition when the hybrid motor vehicle is traveling on motive power from the vehicle traction electric motor without operating the internal combustion engine, after a system of the hybrid motor vehicle is started.

Claims

1. A hybrid motor vehicle comprising:

an internal combustion engine that outputs motive power for vehicle traction;

an engine-motoring electric motor that motors the internal combustion engine;

a vehicle traction electric motor that outputs motive power for vehicle traction;

a secondary cell that supplies electric power to the engine-motoring electric motor and to the vehicle traction electric motor; and

a pre-engine-start control device that controls the internal combustion engine and the engine-motoring electric motor so as to motor the internal combustion engine in a reverse rotation direction without performing fuel injection nor ignition during a post-system-start electric traction travel during which the hybrid motor vehicle is traveling on motive power from the vehicle traction electric motor without operating the internal combustion engine after a system of the hybrid motor vehicle is started.

2. The hybrid motor vehicle according to claim 1, wherein the pre-engine-start control device controls the internal combustion engine and the engine-motoring electric motor so as to motor the internal combustion engine in the reverse rotation direction if a vehicle speed is equal to or exceeds a predetermined vehicle speed, during the post-system-start electric traction travel.

3. The hybrid motor vehicle according to claim 1, wherein the pre-engine-start control device controls the internal combustion engine and the engine-motoring electric motor so as to motor the internal combustion engine in the reverse rotation direction if an acceleration of the vehicle is equal to or above a predetermined acceleration or if a deceleration of the vehicle is equal to or below a predetermined deceleration, during the post-system-start electric traction travel.

4. The hybrid motor vehicle according to claim 1, wherein the pre-engine-start control device controls the internal combustion engine and the engine-motoring electric motor so that the internal combustion engine is motored in the reverse rotation direction at a rotational speed within a range of 500 rpm to 2000 rpm, for a duration within a range of 1 second to 20 seconds, if the internal combustion engine is motored in the reverse rotation direction during the post-system-start electric traction travel.

5. The hybrid motor vehicle according to claim 1, wherein the pre-engine-start control device refrain from motoring the internal combustion engine in the reverse rotation direction if a coolant temperature of the internal combustion engine is equal to or above a predetermined temperature.

6. The hybrid motor vehicle according to claim 1, further comprising an electric charger that is connected to an external electric power source and that charges the secondary battery.

7. The hybrid motor vehicle according to claim 1, further comprising

a planetary gear mechanism whose three rotation elements are connected to three shafts that are an output shaft of the internal combustion engine, a rotary shaft of the engine-motoring electric motor, and a drive shaft connected to an axle,

wherein the vehicle traction electric motor is an electric motor that functions also as an electricity generator, and

wherein the engine-motoring electric motor is an electric motor that functions also as an electricity generator.

8. The hybrid motor vehicle according to claim 1, further comprising

a pair-rotor electric motor which has an inner rotor that is connected to a crankshaft of the internal combustion engine, and an outer rotor that is connected to a drive shaft that outputs motive power to a driving wheel, and which transmits a portion of the motive power of the internal combustion engine to the drive shaft and converts remainder motive power into electric power,

wherein the vehicle traction electric motor is an electric motor that functions also as an electricity generator, and

wherein the engine-motoring electric motor is an electric motor that functions also as an electricity generator, and motors the internal combustion engine via the pair-rotor electric motor.

9. The hybrid motor vehicle according to claim 1, wherein:

a first one of the vehicle traction electric motor is attached via a transmission to a drive shaft that is connected to a driving wheel, and the internal combustion engine is connected to a rotary shaft of the first one of the vehicle traction electric motor via a clutch, and a second one of the vehicle traction electric motor is attached to a crankshaft of the internal combustion engine; and

motive power from the internal combustion engine and from the second one of the vehicle traction electric motor is output to the drive shaft via the rotary shaft of the first one of the vehicle traction electric motor and the transmission, and motive power from the first one of the vehicle traction electric motor is output to the drive shaft via the transmission.

10. A method of controlling a hybrid motor vehicle that includes an internal combustion engine that outputs motive power for vehicle traction, an engine-motoring electric motor that motors the internal combustion engine, a vehicle traction electric motor that outputs motive power for vehicle traction, and a secondary battery that supplies electric power to the engine-motoring electric motor and to the vehicle traction electric motor, the control method comprising:

controlling the internal combustion engine and the engine-motoring electric motor so as to motor the internal combustion engine in a reverse rotation direction without performing fuel injection nor ignition while the hybrid motor vehicle is traveling on motive power from the vehicle traction electric motor without operating the internal combustion engine after a system of the hybrid motor vehicle is started.