Control system for controlling driving power distribution for four wheel drive automotive vehicle with feature of avoidance of influence of wheel speed data fluctuation
First Claim
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1. A power distribution control system for an automotive vehicle, comprising:
- a power train for transmitting engine output from an internal combustion engine to a plurality of primary and secondary driving wheels, said power train including a transfer unit which selectively connects and disconnects the engine output to the secondary driving wheels for distributing a portion of the engine output to the secondary driving wheels at a controlled power distribution ratio;
first sensor means for monitoring wheel speeds of the primary and secondary driving wheels and providing first signals indicative thereof;
second sensor means for monitoring a longitudinal acceleration acting on a body of said vehicle and providing a second signal indicative thereof;
vehicle speed projecting means, responsive to the first and second signals from the first and second sensor means, for projecting a vehicle speed based on a preselected one of the wheel speeds of the primary and secondary wheels and the longitudinal acceleration acting on the body of said vehicle and providing a third signal indicative thereof, the vehicle speed varying with a variation defined by the longitudinal acceleration;
power distribution ratio determining means responsive to the third signal from said vehicle speed projecting means, for determinating a first power distribution ratio of the engine output power to the secondary driving wheels in a first preselected relation to the projected vehicle speed and providing a fourth signal indicative thereof; and
controlling means, responsive to the fourth signal from said power distribution ratio determining means, for controlling the transfer unit to distribute the engine output power to the secondary driving wheels at the first power distribution ratio determined by said power distribution determining means.
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Abstract
A power distribution control system for an automotive vehicle, takes an approach for projecting vehicle speed representative value on the basis of a wheel speed latched immediately before initiation of wheel speed variation irrespective of the vehicle speed, and a predetermined variation rate of the vehicle speed. The vehicle speed representative value is derived as a function of time by taking the latched wheel speed as an initial value. The projected vehicle speed data is utilized with other preselected power distribution control parameters for controlling distribution ratio of driving power for a primary and a subsidiary driving wheels.
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Citations
17 Claims
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1. A power distribution control system for an automotive vehicle, comprising:
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a power train for transmitting engine output from an internal combustion engine to a plurality of primary and secondary driving wheels, said power train including a transfer unit which selectively connects and disconnects the engine output to the secondary driving wheels for distributing a portion of the engine output to the secondary driving wheels at a controlled power distribution ratio; first sensor means for monitoring wheel speeds of the primary and secondary driving wheels and providing first signals indicative thereof; second sensor means for monitoring a longitudinal acceleration acting on a body of said vehicle and providing a second signal indicative thereof; vehicle speed projecting means, responsive to the first and second signals from the first and second sensor means, for projecting a vehicle speed based on a preselected one of the wheel speeds of the primary and secondary wheels and the longitudinal acceleration acting on the body of said vehicle and providing a third signal indicative thereof, the vehicle speed varying with a variation defined by the longitudinal acceleration; power distribution ratio determining means responsive to the third signal from said vehicle speed projecting means, for determinating a first power distribution ratio of the engine output power to the secondary driving wheels in a first preselected relation to the projected vehicle speed and providing a fourth signal indicative thereof; and controlling means, responsive to the fourth signal from said power distribution ratio determining means, for controlling the transfer unit to distribute the engine output power to the secondary driving wheels at the first power distribution ratio determined by said power distribution determining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a combination of an anti-skid contol system and a power distribution control system for an automotive vehicle,
said anti-skid control system comprising: -
first detecting means for detecting wheel speed of a primary and a secondary driving wheel and providing a first signal indicative thereof; second detecting means for detecting a longitudinal acceleration acting on a vehicle body and providing a second signal indicative thereof; vehicle speed projecting means, responsive to the first and second signals from said first and second detecting means, for projecting a vehicle speed based on a preselected one of the wheel speeds of the primary and secondary driving wheels and the longitudinal acceleration to provide a third signal indicative thereof, the vehicle speed varying with a variation defined by the longitudinal acceleration; wheel slippage determining means, responsive to the first, second and third signals from said first detecting means, second detecting means and said vehicle speed projecting means respectively, for detemining a wheel slippage based on the wheel speeds and the projected vehicle speed to provide a fourth signal indicative thereof; and braking means for controlling a braking force applied to a plurality of braking units which are associated with the primary an secondary driving wheels based on the wheel slippage determined by said wheel slippage determining means to maintain the wheel slippage at a predetermined optimal level, and said power distribution control system comprising; a power train for transmitting engine output from an internal combustion engine to the primary and secondary driving wheels, the power train including a transfer unit which selectively connects and disonnects the engine output to the secondary driving wheels to distribute a portion of the engine output to the secondary driving wheels at a controlled power distribution ratio; power distribution ratio determining means, responsive to the third signal from said vehicle speed projecting means, for determining a first power distribution ratio of the engine output power to the secondary driving wheels in a first preselected relation to the projected vehicle speed and providing a fifth signal indicative thereof; and controlling means, responsive to the fifth signal from said power distribution ratio determining means, for controlling the transfer unit to distribute the engine output power to the secondary driving wheels at the first power distribution ratio determined by said power distribution determining means. - View Dependent Claims (16, 17)
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Specification