Method and system for regulating a stability control system in a vehicle
First Claim
1. A method for controlling the stability of a vehicle, the vehicle comprising a body and at least one front axle and at least one rear axle, each axle comprising at least two ground contacting arrangements mounted on either side of the mid plane of symmetry of the vehicle, each at least two ground contacting arrangements comprising a wheel and a tire in contact with the ground, the vehicle having operating means to act on the forces transmitted to the ground by each of the wheels, the method comprising the steps of:
- (a) measuring in real time an actual value of a variable selected from the group comprising cornering force “
Y” and
vertical load “
Z”
acting at the center of each of the front and rear wheels;
(b) calculating in real time a desired value of at least one reference parameter, said at least one reference parameter being correlatable to the actual value, the desired value being determined as a result of an action of the driver on the operating means and taking into account load transfers on both sides of the mid plane of symmetry of the vehicle;
(c) comparing said desired value of the reference parameter of step (b) to the actual value to determine whether the actual value is compatible with the desired value of the reference parameter; and
(d) if the comparison of step (c) indicates that the actual value is not compatible, acting on the operating means such that the actual value is brought into substantial compatibility with the desired value of the reference parameter.
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Accused Products
Abstract
The invention relates to a method for regulating a stability control system of a vehicle based on the forces acting at the center of each wheel of the vehicle. The actions of the driver, i.e. steering, acceleration or braking, produce forces (changes in forces) transmitted by the tires to the ground. It is proposed to control the operating mechanisms of the vehicle (active anti-roll device, engine torque, braking torque, load per wheel or direction) utilizing instructions resulting from the actions of the driver to apply forces. The invention proposes a method of expressing, in terms of forces, the inputs of the driver, taking into account the load transfers on both sides of the mid plane of symmetry of the vehicle, as a function of the forward velocity of the vehicle and the angle at the steering wheel (steering wheel velocity and steering wheel acceleration). If the actual forces that are measured do not correspond to the forces desired by the driver, the active system compensates for this difference by acting on the force distributions in the chassis.
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Citations
22 Claims
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1. A method for controlling the stability of a vehicle, the vehicle comprising a body and at least one front axle and at least one rear axle, each axle comprising at least two ground contacting arrangements mounted on either side of the mid plane of symmetry of the vehicle, each at least two ground contacting arrangements comprising a wheel and a tire in contact with the ground, the vehicle having operating means to act on the forces transmitted to the ground by each of the wheels, the method comprising the steps of:
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(a) measuring in real time an actual value of a variable selected from the group comprising cornering force “
Y” and
vertical load “
Z”
acting at the center of each of the front and rear wheels;
(b) calculating in real time a desired value of at least one reference parameter, said at least one reference parameter being correlatable to the actual value, the desired value being determined as a result of an action of the driver on the operating means and taking into account load transfers on both sides of the mid plane of symmetry of the vehicle;
(c) comparing said desired value of the reference parameter of step (b) to the actual value to determine whether the actual value is compatible with the desired value of the reference parameter; and
(d) if the comparison of step (c) indicates that the actual value is not compatible, acting on the operating means such that the actual value is brought into substantial compatibility with the desired value of the reference parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vehicle stability control system, the vehicle comprising a body and at least one front axle and at least one rear axle, each axle comprising at least two ground contacting arrangements mounted on either side of the mid plane of symmetry of the vehicle, each ground contacting arrangement comprising a wheel and a tire in contact with the ground, the vehicle having operating means to act on the forces transmitted to the ground by each of the wheels, the system comprising:
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(a) means for measuring in real time actual values of one variable selected from the group comprising cornering force “
Y” and
vertical load “
Z”
acting at the center of each of the front and rear wheels;
(b) a controller having calculating means for calculating in real time desired values of at least one reference parameter, said at least one reference parameter being correlatable to the actual values, and determined from an action of the driver on the operating means and taking into account the load transfers on both sides of the mid plane of symmetry of the vehicle, said controller further having comparing means for comparing the desired values with the measured actual values in order to obtain an error signal, and;
(c) means for acting on the operating means so as to minimize the error signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification