Driving torque distribution control system for 4WD vehicle
First Claim
1. A driving force distribution control system for a vehicle, comprising;
- actuator means for varying a driving force distribution ratio of a driving force transmitted from an engine of said vehicle to secondary driving wheels of said vehicle to a driving force transmitted from said engine to primary driving wheels of said vehicle, in accordance with a driving force distribution control signal,means for estimating an amount of engine braking applied on said vehicle, andcontroller means for controlling said driving force distribution ratio by producing said control signal in accordance with said amount of engine braking estimated by said estimating means.
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Abstract
A control system for a 4WD vehicle includes a transfer clutch capable of continuously varying a driving torque distribution ratio between front and rear axles, and a controller for producing a control signal to control the distribution ratio. In order to improve the stability of the vehicle during deceleration, the control system is provided with a sensor for sensing one or more of an engine speed, a throttle opening, a transmission gear ratio, a vehicle speed and other vehicle operating parameters affecting engine braking, and a controller section for controlling the distribution ratio in accordance with the amount of engine braking at a level which is higher enough than the level of 2WD to adequately distribute the engine braking force between the front and rear axles and which is lower enough than the 4WD level to allow the front and rear axles to rotate at different speeds.
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Citations
20 Claims
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1. A driving force distribution control system for a vehicle, comprising;
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actuator means for varying a driving force distribution ratio of a driving force transmitted from an engine of said vehicle to secondary driving wheels of said vehicle to a driving force transmitted from said engine to primary driving wheels of said vehicle, in accordance with a driving force distribution control signal, means for estimating an amount of engine braking applied on said vehicle, and controller means for controlling said driving force distribution ratio by producing said control signal in accordance with said amount of engine braking estimated by said estimating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification