Controller of vehicle and control method of vehicle

• US 8,771,142 B2
• Filed: 11/28/2011
• Issued: 07/08/2014
• Est. Priority Date: 11/30/2010
• Status: Expired due to Fees

• Current Assignee: Jatco Limited (Nissan Motor Co., Ltd.)
• Original Assignee: Jatco Limited (Nissan Motor Co., Ltd.)
• Inventors: Watanabe, Shinichiro, Tatewaki, Keichi, Yamada, Naohiro, Wakayama, Hideshi
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US13/305,187
• Publication Number:
  US 20120135839A1
• Time in Patent Office: 953 Days
• Field of Search: 701/112
• US Class Current: 477/54
• CPC Class Codes: B60W 2030/18081 With torque flow from driveshaft to engine, i.e. engine being driven by vehicle
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/18072 Coasting
• CPC Class Codes: F02N 11/0833 Vehicle conditions F02N11/0822, F02N11/0825 take precedence
• CPC Class Codes: F16H 2037/023 CVT's provided with at least two forward and one reverse ratio in a serial arranged sub-transmission
• CPC Class Codes: F16H 2312/14 Going to, or coming from standby operation, e.g. for engine start-stop operation at traffic lights
• CPC Class Codes: F16H 37/022 the toothed gearing having orbital motion
• CPC Class Codes: F16H 61/66259 using electrical or electronical sensing or control means
• CPC Class Codes: F16H 61/702 using electric or electrohydraulic control means
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/60 Other road transportation technologies with climate change mitigation effect

Abstract

A controller of a vehicle, provided with a coast stop control unit which automatically stops an engine during the travel of a vehicle if coast stop conditions are met during the travel of the vehicle, and the coast stop control unit automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less.

Claims

1. A controller of a vehicle, comprising a coast stop control unit which automatically stops an engine during the travel of a vehicle when coast stop conditions are met during the travel of the vehicle, wherein

the coast stop control unit automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less.

2. The controller of a vehicle according to claim 1, further comprising:

an acceleration determining means unit determines whether the change amount of the acceleration of the vehicle caused by the automatic stop of the engine becomes larger than the predetermined acceleration when the coast stop conditions are met; and

a coast stop control prohibiting unit which prohibits the automatic stop of the engine by the coast stop control unit if it is determined that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration.

3. The controller of a vehicle according to claim 2, further comprising:

a fluid transmitting device which is interposed between the engine and driving wheels and transmits a driving force of the engine to the driving wheels, wherein

the acceleration determining unit determines that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration if a rotation ratio of the fluid transmitting device is smaller than a predetermined rotation ratio.

4. The controller of a vehicle according to claim 2, further comprising:

a driving force detecting means which detects a driving force to be transmitted from the engine to driving wheels, wherein

the acceleration determining means determines that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration if the detected driving force is larger than the predetermined driving force.

5. The controller of a vehicle according to claim 2, further comprising:

a driving force detecting unit which detects a driving force to be transmitted from the engine to driving wheels, wherein

the acceleration determining unit determines that the change amount of the acceleration of the vehicle becomes larger than the predetermined acceleration if the detected driving force is in a state to be transmitted from the engine to the driving wheels.

6. The controller of a vehicle according to claim 1, further comprising:

a fluid transmitting device which is interposed between the engine and driving wheels and transmits a driving force of the engine to the driving wheels, wherein

the coast stop control unit automatically stops the engine if a rotation ratio of the fluid transmitting device is a predetermined rotation ratio or more.

7. The controller of a vehicle according to claim 1, further comprising:

a driving force detecting unit which detects a driving force to be transmitted from the engine to driving wheels, wherein

the coast stop control unit automatically stops the engine if the driving force detected by the driving force detecting unit is a predetermined driving force or less.

8. The controller of a vehicle according to claim 1, further comprising:

a driving force detecting unit which detects a driving force to be transmitted from the engine to driving wheels, wherein

the coast stop control unit automatically stops the engine if the driving force detected by the driving force detecting unit is in a state to be transmitted from the driving wheels to the engine.

9. A controller of a vehicle according to claim 3, wherein

the predetermined rotation ratio is 1.

10. A controller of a vehicle according to claim 6, wherein

the predetermined rotation ratio is 1.

11. A control method of a vehicle, the control method comprising automatically stopping an engine during the travel of a vehicle if coast stop conditions are met during the travel of the vehicle, wherein

the engine is automatically stopped at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less.

12. A controller of a vehicle, comprising coast stop control means for automatically stopping an engine during the travel of a vehicle when coast stop conditions are met during the travel of the vehicle, wherein

the coast stop control means automatically stops the engine at least if a change amount of acceleration of the vehicle caused by the automatic stop of the engine is predetermined acceleration or less.