Vehicle drive force controller

• US 6,016,457 A
• Filed: 11/19/1997
• Issued: 01/18/2000
• Est. Priority Date: 11/19/1996
• Status: Expired due to Fees

• Current Assignee: Nissan Motor Co., Ltd.
• Original Assignee: Nissan Motor Co., Ltd.
• Inventors: Abe, Hiroshi, Toukura, Nobusuke, Iwasaki, Yoshinori
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): Hernandez, Olga
• Application Number:
  US08/974,491
• Time in Patent Office: 790 Days
• Field of Search: 701/70, 701/53, 701/65, 701/55, 701/56, 180/167, 180/197, 340/995, 340/905, 342/450, 342/451, 342/359
• US Class Current: 701/70
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2554/00 Input parameters relating to objects
• CPC Class Codes: B60W 2554/406 Traffic density
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 2710/0605 Throttle position
• CPC Class Codes: B60W 2710/0622 Air-fuel ratio
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2041/1422 Variable gain or coefficients
• CPC Class Codes: F02D 2200/701 Information about vehicle position, e.g. from navigation system or GPS signal
• CPC Class Codes: F02D 2200/702 Road conditions
• CPC Class Codes: F16H 2059/605 Traffic stagnation information, e.g. traffic jams
• CPC Class Codes: F16H 2059/663 Road slope
• CPC Class Codes: F16H 2059/666 Determining road conditions by using vehicle location or position, e.g. from global navigation systems [GPS]
• CPC Class Codes: F16H 59/54 dependent on signals from the brakes, e.g. parking brakes
• CPC Class Codes: F16H 59/66 Road conditions, e.g. slope, slippery
• CPC Class Codes: F16H 61/0213 : characterised by the method for generating shift signals

Abstract

A regional attribute for a region in which a vehicle is traveling is detected by a vehicle navigation device, and vehicle drive force characteristics such as a throttle gain of an electronic throttle or a speed change pattern of an automatic transmission are modified according to the regional attribute. An operation amount of an accelerator operated by a driver is detected, and by not modifying the drive force characteristics when the accelerator operation amount is not zero, abrupt change of drive force is avoided, and the sense of discomfort experienced by a driver due to abrupt change of drive force is eliminated.

Claims

1. A vehicle drive force controller in which drive force characteristics of a vehicle are modified according to a regional attribute of a region in which said vehicle is travelling, comprising:

a navigation device that detects the regional attribute of the region in which said vehicle is travelling;

an acceleration sensor that detects whether an acceleration pedal is depressed;

a microprocessor programmed to modify the drive force characteristics according to a change of said regional attribute when said accelerator is not depressed, while preventing the drive force characteristics from being modified when said accelerator pedal is depressed; and

a drive force control device that controls a drive force of said vehicle according to the drive force characteristics determined by said microprocessor.

2. A vehicle drive force controller wherein drive force characteristics of a vehicle are modified according to a regional attribute of a region in which said vehicle is traveling, comprising:

a navigation device for detecting the regional attribute of the region in which said vehicle is traveling,

an accelerator operation amount sensor for detecting an operation amount of an accelerator operated by a driver,

a microprocessor programmed to;

determine whether or not said accelerator operation amount is zero, and

determine the drive force characteristics such that the drive force characteristics are modified according to a change of said regional attribute when said accelerator operation amount is zero, and that the drive force characteristics are not modified when said accelerator operation amount is not zero, and

a drive force control device for controlling a drive force of said vehicle according to the drive force characteristics determined by said microprocessor.

3. A drive force controller as defined in claim 2, wherein said drive force control device comprises an electronic throttle for varying an engine output at a predetermined throttle gain relative to said accelerator operation amount, and said drive force characteristics comprise said throttle gain.

4. A drive force controller as defined in claim 2, wherein said drive force control device comprises an automatic transmission for transmitting an engine rotation according to a predetermined speed change pattern, and said drive force characteristics comprise said speed change pattern.

5. A drive force controller as defined in claim 2, wherein said drive force control device comprises a device for modifying an engine air-fuel ratio, and said drive force characteristic comprise said air-fuel ratio.

6. A vehicle drive force controller wherein drive force characteristics of a vehicle are modified according to a regional attribute of a region in which said vehicle is traveling, comprising:

a sensor for detecting a traveling condition of said vehicle,

a microprocessor programmed to;

determine whether or not said vehicle is in a traffic jam based on the traveling condition, and

determine the drive force characteristics by modifying said characteristics based on a change of said regional attribute when said vehicle is not traveling in a traffic jam, and prohibiting modification of said characteristics when said vehicle is traveling in a traffic jam, and

a drive force control device for controlling a drive force of said vehicle according to the drive force characteristics determined by said microprocessor.

7. A vehicle drive force controller as defined in claim 6, wherein said sensor comprises an optical recognition device for detecting whether or not there is another vehicle in front of said vehicle, and said microprocessor is programmed to determine whether or not said vehicle is traveling in a traffic jam based on an output signal from said optical recognition device.

8. A vehicle drive force controller as defined in claim 6, wherein said sensor comprises a sensor for detecting an operating frequency of an accelerator operated by a driver, and said microprocessor is programmed to determine that said vehicle is traveling in a traffic jam when said accelerator operating frequency is greater than a predetermined value.

9. A vehicle drive force controller as defined in claim 6, wherein said sensor comprises a sensor for detecting an operating frequency of a brake operated by a driver, and said microprocessor is programmed to determine that said vehicle is traveling in a traffic jam when brake operating frequency is greater than a predetermined value.

10. A vehicle drive force controller as defined in claim 6, wherein said sensor comprises a device for receiving information relating to the location of traffic jams emitted from outside said vehicle and a device for detecting a present position of said vehicle, and said microprocessor is programmed to determine whether or not said vehicle is traveling is a traffic jam by comparing said present position of said vehicle with said information relating to the location of traffic jams.

11. A vehicle drive force controller as defined in claim 6, wherein said drive force control device comprises an electronic throttle for varying an engine output at a predetermined throttle gain relative to an accelerator operation amount, and said drive force characteristics comprise said throttle gain.

12. A drive force controller as defined in claim 6, wherein said drive force control device comprises an automatic transmission for transmitting an engine rotation according to a predetermined speed change pattern, and said drive force characteristics comprise said speed change pattern.

13. A drive force controller as defined in claim 6, wherein said drive force control device comprises a device for modifying an engine air-fuel ratio, and said drive force characteristics comprise said air-fuel ratio.

14. A vehicle drive force controller wherein drive force characteristics of a vehicle are modified according to a regional attribute of a region in which said vehicle is traveling, comprising:

a navigation device comprising a global positioning system for detecting a present position of said vehicle, and

a memory for storing altitude data for an area surrounding said present position,

a microprocessor programmed to;

calculate a slope of a road on which said vehicle is traveling from said altitude data for said area surrounding said present position,

select drive force characteristics for a mountainous area when said slope is equal to or greater than a predetermined value,

select drive force characteristics different from those for a mountainous area when said slope is less than said predetermined value, and

a drive force control device for controlling a drive force of said vehicle according to the drive force characteristics selected by said microprocessor.

15. A vehicle drive force controller as defined in claim 14, wherein said drive force control device comprises an electronic throttle for varying an engine output at a predetermined throttle gain relative to an accelerator operation amount, said drive force characteristics comprise said throttle gain, and said microprocessor is programmed to select a throttle gain set such that an opening of said electronic throttle is larger when said slope is equal to or greater than a predetermined value than when said slope is less than said predetermined value.

16. A vehicle drive force controller as defined in claim 14, wherein said drive force control device comprises an automatic transmission for transmitting an engine rotation according to a predetermined speed change pattern, said drive force characteristics comprise said speed change pattern, and said microprocessor is programmed to select a speed change pattern set so that a lower gear is applied when said slope is equal to or greater than a predetermined value than when said slope is less than said predetermined value.

17. A vehicle drive force controller wherein drive force characteristics of a vehicle are modified according to a regional attribute of a region in which said vehicle is traveling, comprising:

a navigation device for detecting the regional attribute of the region in which said vehicle is traveling,

an accelerator operation amount sensor for detecting an operation amount of an accelerator operated by a driver,

a microprocessor programmed to;

calculate a target value of a throttle gain based on said regional attribute,

calculate a new throttle gain obtained by adding a predetermined amount to a present throttle gain such that said present throttle gain approaches said target value in steps, and

an electronic throttle for varying an engine output based on said new throttle gain.

18. A vehicle drive force controller as defined in claim 17, wherein said navigation device comprises a global positioning system for detecting a present position of said vehicle, and a memory for storing a map for determining a regional attribute of said present position.

19. A vehicle drive force controller as defined in claim 17, wherein said microprocessor is further programmed not to perform calculation of said new throttle gain when an accelerator operation amount is not zero.

20. A vehicle drive force controller as defined in claim 19, wherein said microprocessor is further programmed to calculate said new throttle gain once each time said accelerator operation amount becomes zero.

21. A drive force controller as defined in claim 17, further comprising an automatic transmission for transmitting an engine rotation according to a predetermined speed change pattern, and said microprocessor is further programmed to vary said speed change pattern according to said regional attribute.