Motion control system for vehicle

A motion control system for a vehicle, comprising:

• at least one front wheel side suspension that is provided to a plurality of front wheels of the vehicle and has an anti-dive geometry;
• at least one rear wheel side suspension that is provided to a plurality of rear wheels of the vehicle and has an anti-lift geometry, wherein a change in a degree of an anti-lift effect of the anti-lift geometry relative to a change in a rear wheel brake force respectively applied to the plurality of rear wheels is larger than a change in a degree of an anti-dive effect of the anti-dive geometry relative to a change in a front wheel brake force respectively applied to the plurality of front wheels;
• a brake control apparatus that is operable to independently apply and control the front wheel brake force and the rear wheel brake force;
• a basic distribution implementing means for controlling the brake control apparatus during operation of a brake operating member of the vehicle by a driver, wherein the basic distribution implementing means controls the brake control apparatus such that a sum of the front wheel brake force and the rear wheel brake force becomes a demanded value, which corresponds to an amount of operation of the brake operating member by the driver, and a brake force distribution between the plurality of front wheels and the plurality of rear wheels becomes a basic distribution, wherein the basic distribution is one of:
• a distribution, which is equal to an ideal distribution that implements simultaneous locking of the plurality of front wheels and the plurality of rear wheels;
• and
• a distribution, at which the rear wheel brake force is smaller than that of the ideal distribution;
• and
• at least one of a first distribution control means and a second distribution control means, wherein:
• the first distribution control means is for controlling the brake control apparatus such that the sum of the front wheel brake force and the rear wheel brake force becomes the demanded value, and the brake force distribution between the plurality of front wheels and the plurality of rear wheels becomes a first distribution, at which the rear wheel brake force is larger than that of the basic distribution;
• the first distribution control means starts the controlling of the brake control apparatus when a rate of change in the amount of operation of the brake operating member for applying the front and rear wheel brake forces becomes larger than a predetermined rate;
• the first distribution control means terminates the controlling of the brake control apparatus when an angular acceleration of a pitch angle of a vehicle body of the vehicle is changed from a positive range to a negative range;
• the pitch angle of the vehicle body is defined such that when a front side of the vehicle body is tilted downward, the pitch angle of the vehicle body is in the positive range;
• the second distribution control means is for controlling the brake control apparatus such that the sum of the front wheel brake force and the rear wheel brake force becomes the demanded value, and the brake force distribution between the plurality of front wheels and the plurality of rear wheels becomes a second distribution, at which the rear wheel brake force is smaller than that of the basic distribution;
• the second distribution control means starts the controlling of the brake control apparatus when a rate of change in the amount of operation of the brake operating member for releasing the front and rear brake forces becomes larger than a predetermined rate;
• the second distribution control means terminates the controlling of the brake control apparatus when the angular acceleration of the pitch angle of the vehicle body is changed from the negative range to the positive range.