Four wheel driving vehicle of a front/rear wheel differential operation limiting type
First Claim
1. A four wheel driving vehicle of a front/rear wheel differential operation limiting type wherein a differential operation condition between front and rear wheels is limited to control a torque distribution between said front and rear wheels, comprising:
- front/rear wheel speed difference proportional amount calculating means for calculating a limiting controlling amount for the differential operation condition in response to a difference in speeds of rotation between said front and rear wheels;
advancing direction acceleration proportional calculating means for calculating a limiting controlling amount for the differential operation condition in response to an acceleration of said vehicle in an advancing direction;
driving output torque proportional amount calculating means for calculating a limiting controlling amount for the differential operation condition in response to a driving output torque; and
means for selecting a maximum one of the limiting controlling amounts calculated by said front/rear wheel speed difference proportional amount calculating means, advancing direction acceleration proportional calculating means and driving output torque proportional calculating means so that the differential operation condition may be limited in accordance with the thus selected limiting controlling amount.
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Accused Products
Abstract
A four wheel driving vehicle includes a center differential gear wherein a differential operation limit is achieved by a wet hydraulic multiple disk clutch and is improved in running performance, turning performance, acceleration performance and so forth. An engaging force of the clutch and hence a hydraulic pressure to be supplied to the clutch are controlled in accordance with a steering angle, a vehicle speed, an advancing direction acceleration, an engine output torque, a differential operation speed difference between front and rear wheels and so forth to obtain a desired torque distribution suitable for a current running condition of the vehicle.
83 Citations
27 Claims
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1. A four wheel driving vehicle of a front/rear wheel differential operation limiting type wherein a differential operation condition between front and rear wheels is limited to control a torque distribution between said front and rear wheels, comprising:
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front/rear wheel speed difference proportional amount calculating means for calculating a limiting controlling amount for the differential operation condition in response to a difference in speeds of rotation between said front and rear wheels; advancing direction acceleration proportional calculating means for calculating a limiting controlling amount for the differential operation condition in response to an acceleration of said vehicle in an advancing direction; driving output torque proportional amount calculating means for calculating a limiting controlling amount for the differential operation condition in response to a driving output torque; and means for selecting a maximum one of the limiting controlling amounts calculated by said front/rear wheel speed difference proportional amount calculating means, advancing direction acceleration proportional calculating means and driving output torque proportional calculating means so that the differential operation condition may be limited in accordance with the thus selected limiting controlling amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification