Vehicle driving force control device

• US 20070118268A1
• Filed: 11/16/2006
• Published: 05/24/2007
• Est. Priority Date: 11/22/2005
• Status: Active Grant

• Current Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Original Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Inventors: Inoue, Koichi, Hosokawa, Keisuke
• Granted Patent: US 7,831,344 B2
• Time in Patent Office: Days
• US Class Current: 701/80
• CPC Class Codes: B60K 28/16 responsive to, or preventing, skidding of wheels brake control systems for vehicle drive stability B60T8/1755; arrangements responsive to a speed condition for adjusting wheel braking force B60T8/32; control of vehicle driving stability otherwise than by controlling the propulsion unit only B60W30/02; preventing wheel slippage by reducing power in rail vehicles B61C15/00
• CPC Class Codes: B60W 2552/40 Coefficient of friction
• CPC Class Codes: B60W 40/109 Lateral acceleration
• 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 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/2422 Selective use of one or more tables
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In a throttle valve control device, an engine required output setting section sets an engine required output corresponding to an accelerator opening degree by means of selecting a characteristic which is varied depending on a road surface friction coefficient or by means of interpolation calculation based on a road surface friction coefficient. An engine required torque setting section sets an engine required torque based on an engine speed and the engine required output. A throttle opening degree setting section sets a throttle opening degree based on the engine speed and the engine required torque and outputs a signal corresponding to the throttle opening degree to a throttle motor.

Claims

1. A vehicle driving force control device comprising:

road surface friction coefficient estimation means for estimating a road surface friction coefficient;

driving intention detection means for detecting a driving intention of a driver;

driving output setting means for variably setting a driving output in accordance with the road surface friction coefficient and the driving intention; and

actuator control means for controlling an operation of an actuator in accordance with the driving output set in the driving output setting means.

2. The vehicle driving force control device according to claim 1, wherein the driving output is set such as a convex upward curve with the driving intention if the road surface friction coefficient is high, and the driving output is set such as a convex downward curve with driving intention if the road surface friction coefficient is low.

3. The vehicle driving force control device according to claim 1, the vehicle driving force control device further comprises lateral acceleration detection means for detecting a lateral acceleration acting on the vehicle,

wherein the driving output setting means sets an upper limit to the driving output in accordance with the lateral acceleration and the road surface friction coefficient.

4. The vehicle driving force control device according to claim 1, wherein the actuator control means sets a throttle opening degree of an electronic controlled throttle valve.

5. A vehicle driving force control device comprising:

road surface friction coefficient estimation means for estimating a road surface friction coefficient;

driving intention detection means for detecting a driving intention of a driver;

driving output setting means for variably setting a driving output in accordance with the road surface friction coefficient and the driving intention; and

actuator control means for controlling an operation of an actuator in accordance with the driving output set in the driving output setting means,

wherein the driving output is set such as a convex upward curve with the driving intention if the road surface friction coefficient is high, and the driving output is set such as a convex downward curve with driving intention if the road surface friction coefficient is low.

6. The vehicle driving force control device according to claim 5, the vehicle driving force control device further comprises lateral acceleration detection means for detecting a lateral acceleration acting on the vehicle,

wherein the upper limit to be previously set is variably set the driving output setting means sets an upper limit to the driving output in accordance with the lateral acceleration and the road surface friction coefficient.

7. A vehicle driving force control device comprising:

road surface friction coefficient estimation means for estimating a road surface friction coefficient;

driving intention detection means for detecting a driving intention of a driver;

driving output setting means for variably setting a driving output in accordance with the road surface friction coefficient and the driving intention;

actuator control means for controlling an operation of an actuator in accordance with the driving output set in the driving output setting means; and

lateral acceleration detection means for detecting a lateral acceleration acting on the vehicle,

wherein the driving output setting means sets an upper limit to the driving output in accordance with the lateral acceleration and the road surface friction coefficient.

8. The vehicle driving force control device according to claim 7, wherein the driving output is set such as a convex upward curve with the driving intention if the road surface friction coefficient is high, and the driving output is set such as a convex downward curve with driving intention if the road surface friction coefficient is low.