Control method and system for vehicle

• US 6,656,090 B2
• Filed: 02/27/2001
• Issued: 12/02/2003
• Est. Priority Date: 07/17/2000
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sakamoto, Hiroshi, Ochi, Tatsuya, Matsumura, Tetsuo, Kayano, Mitsuo
• Primary Examiner(s): Marmor, Charles A
• Assistant Examiner(s): Le, David D.
• Application Number:
  US09/793,403
• Publication Number:
  US 20020006851A1
• Time in Patent Office: 1,008 Days
• Field of Search: 477/175, 477/181, 477/171, 477/173, 477/83, 477/84, 477/74, 192/53.35, 192/3.58, 192/3.63
• US Class Current: 477/171
• 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 10/11 Stepped gearings
• CPC Class Codes: B60W 2510/0241 Clutch slip, i.e. difference between input and output speeds
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/027 Clutch torque
• CPC Class Codes: B60W 2710/0605 Throttle position
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 30/18 Propelling the vehicle
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: B60W 30/18063 Creeping
• CPC Class Codes: F16D 2500/10412 Transmission line of a vehicle
• CPC Class Codes: F16D 2500/10462 Dog-type clutch
• CPC Class Codes: F16D 2500/3022 Current
• CPC Class Codes: F16D 2500/3024 Pressure
• CPC Class Codes: F16D 2500/3026 Stroke
• CPC Class Codes: F16D 2500/3067 Speed of the engine
• CPC Class Codes: F16D 2500/30816 Speed of the input shaft
• CPC Class Codes: F16D 2500/3101 Detection of a brake actuation by a sensor on the brake brake pedal actuation F16D2500/31426
• CPC Class Codes: F16D 2500/31413 : Clutch pedal position
• CPC Class Codes: F16D 2500/3144 : Accelerator pedal position
• CPC Class Codes: F16D 2500/31466 : Gear lever
• CPC Class Codes: F16D 2500/3166 : Detection of an elapsed period of time
• CPC Class Codes: F16D 2500/70458 : Engine torque
• CPC Class Codes: F16D 48/06 : Control by electric or electronic means, e.g. of fluid pressure
• CPC Class Codes: F16D 48/08 : Regulating clutch take-up on starting
• CPC Class Codes: F16H 2312/02 : Driving off
• CPC Class Codes: F16H 61/20 : Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control
• CPC Class Codes: F16H 61/688 : with two inputs, e.g. selection of one of two torque-flow paths by clutches

Abstract

A method for controlling a vehicle having a first clutch mounted between an engine and a gear drive transmission, and dog clutch type torque transmission means disposed between an input shaft and an output shaft of the gear drive transmission, and wherein the first clutch is controlled at starting the vehicle or at gear shifting, comprising the steps of controlling a transmission torque of the first clutch based on a difference between the engine speed/revolution speed of the input shaft at starting the vehicle so as to control a quantity of increase in a transmission torque of the first clutch in accordance with the value of the difference; and controlling the engine torque based on the transmission torque of the first clutch so as to increase the engine torque according to an increase in the transmission torque of the first clutch.

Claims

1. A method for controlling an automotive vehicle having a first clutch mounted between an engine and a gear drive transmission, for connecting or disconnecting torque transmitted from said engine to driving wheels, and a torque transmission disposed between an input shaft and an output shaft of said gear drive transmission, wherein said torque transmission is of the dog clutch type, and wherein said first clutch is controlled at starting the vehicle or at gear shifting, thereby to continuously increase a transmission torque of said first clutch to said input shaft of said gear drive transmission, said method comprising the steps of:

upon starting the vehicle, controlling the transmission torque of said first clutch to increase a quantity of increase in a transmission torque of said first clutch in proportion to a difference between an engine speed and an input shaft revolution speed; and

controlling a torque of said engine based on the transmission torque of said first clutch so as to increase the torque of said engine according to an increase in the transmission torque of said first clutch.

2. A method for controlling an automotive vehicle according to claim 1, wherein the transmission torque of said first clutch is controlled by a hydraulic pressure to drive said first clutch.

3. A method for controlling an automotive vehicle according to claim 1, wherein the transmission torque of said first clutch is controlled by a length of stroke to drive said first clutch.

4. A method for controlling an automotive vehicle having a first clutch mounted between an engine and a gear drive transmission, for connecting or disconnecting torque transmitted from said engine to driving wheels, and a torque transmission disposed between an input shaft and an output shaft of said gear drive transmission, wherein said torque transmission is of the dog clutch type, and wherein said first clutch is controlled at starting the vehicle or at gear shifting, thereby to continuously increase a transmission torque of said first clutch to said input shaft of said gear drive transmission, said method comprising the steps of:

upon starting the vehicle, controlling the transmission torque of said first clutch in proportion to a difference between an engine speed and a revolution speed of the transmission input shaft, wherein the transmission torque of said first clutch is held in a specified range when a difference between the engine speed and the revolution speed of said input shaft has reached a specified value.

5. A control system for an automotive vehicle having a first clutch mounted between an engine and a gear drive transmission, for connecting or disconnecting torque transmitted from the engine to driving wheels, and a torque transmission disposed between an input shaft and an output shaft of the gear drive transmission, wherein said torque transmission is of the dog clutch type, and wherein said first clutch is controlled at starting the vehicle or at gear shifting, thereby to continuously increase a transmission torque of said first clutch to said input shaft of said gear drive transmission, said control system comprising:

a clutch control means for, upon starting the vehicle, controlling the transmission torque of said first clutch to increase a quantity of increase in transmission torque of said first clutch in proportion to a difference between an engine speed and an input shaft revolution speed; and

an engine torque control means for controlling the engine torque based on the transmission torque of said first clutch so as to increase the engine torque according to an increase in the transmission torque of said first clutch.

6. A method for controlling an automotive vehicle having a first clutch mounted between an engine and a gear drive transmission, for connecting or disconnecting torque transmitted from an engine to driving wheels, and a torque transmission disposed between an input shaft and an output shaft of said gear drive transmission, wherein said torque transmission is of the dog clutch type, and wherein said first clutch is controlled at starting the vehicle or at gear shifting, thereby to continuously increase a transmission torque of said first clutch to said input shaft of said gear drive transmission, said method comprising the steps of:

upon gear shifting, controlling the transmission torque of said first clutch to increase a quantity of increase in a transmission torque of said first clutch in proportion to a difference between an engine speed and a revolution speed of said input shaft; and

controlling a torque of said engine based on the transmission torque of said first clutch so as to increase the torque of said engine according to an increase in the transmission torque of said first clutch.

7. A method for controlling an automotive vehicle according to claim 6, wherein the transmission torque of said first clutch is controlled by a hydraulic pressure to drive said first clutch.

8. A method for controlling an automotive vehicle according to claim 6, wherein the transmission torque of said first clutch is controlled by a length of stroke to drive said first clutch.

9. A method for controlling an automotive vehicle having a first clutch mounted between an engine and a gear drive transmission, for connecting or disconnecting torque transmitted from an engine to driving wheels, and a torque transmission disposed between an input shaft and an output shaft of said gear drive transmission, wherein said torque transmission is of the dog clutch type, and wherein said first clutch is controlled at starting the vehicle or at gear shifting, thereby to continuously increase a transmission torque of said first clutch to said input shaft of said gear drive transmission, said method comprising the steps of:

upon gear shifting, controlling the transmission torque of said first clutch in proportion to a difference between an engine speed and a revolution speed of the input shaft, wherein the transmission torque of said first clutch is held in a specified range when a difference between the engine speed and the revolution speed of said input shaft has reached a specified value.

10. A control system for an automotive vehicle having a first clutch mounted between an engine and a gear drive transmission, for connecting or disconnecting torque transmitted from the engine to driving wheels, and a torque transmission disposed between an input shaft and an output shaft of the gear drive transmission, wherein said torque transmission is of the dog clutch type, and wherein said first clutch is controlled at starting the vehicle or at gear shifting, thereby to continuously increase a transmission torque of said first clutch to said input shaft of said gear drive transmission, said control system comprising:

a clutch control means for, upon gear shifting, controlling the transmission torque of the first clutch to increase a quantity of increase in transmission torque of said first clutch in proportion to a difference between an engine speed and an input shaft revolution speed; and

an engine torque control means for controlling the engine torque based on the transmission torque of said first clutch so as to increase the engine torque according to an increase in the transmission torque of said first clutch.