Method and system for regulating a stability control system of a vehicle
First Claim
1. A method for controlling the stability of a vehicle, the vehicle comprising a body and at least one front ground contacting arrangement and at least one rear ground contacting arrangement, each ground contacting arrangement comprising in each case a wheel, each wheel comprising a tire in contact with the ground, the vehicle having a characteristic time that is a function of its inertia and corresponds to the time phase shift in the manifestation of the cornering forces on the wheels in the front and in the rear, following a command from the driver of the vehicle, the vehicle being provided with 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 one of a cornering force “
Y” and
a 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, as a result of an action of the driver on the operating means and taking into account the characteristic time;
(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 to bring the actual value into substantial compatibility with the desired value of the reference parameter.
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Accused Products
Abstract
The invention proposes 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) are transmitted by the tires to the ground. Control of the operating means of the vehicle (active anti-roll device, engine torque, braking torque, load per wheel or direction) utilizes 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 as a function of the inertia of the vehicle body, velocity of forward movement of the vehicle, and 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
19 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 ground contacting arrangement and at least one rear ground contacting arrangement, each ground contacting arrangement comprising in each case a wheel, each wheel comprising a tire in contact with the ground, the vehicle having a characteristic time that is a function of its inertia and corresponds to the time phase shift in the manifestation of the cornering forces on the wheels in the front and in the rear, following a command from the driver of the vehicle, the vehicle being provided with 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 one of a cornering force “
Y” and
a 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, as a result of an action of the driver on the operating means and taking into account the characteristic time;
(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 to bring the actual value into substantial compatibility with the desired value of the reference parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A vehicle stability control system, the vehicle comprising a body and at least one front ground contacting arrangement and at least one rear ground contacting arrangement, each ground contacting arrangement comprising a wheel, each wheel comprising a tire in contact with the ground, the vehicle having a characteristic time that is a function of its inertia and corresponds to the time phase shift in the manifestation of the cornering forces on the wheels in the front and in the rear, following a command from the driver of the vehicle, the vehicle being provided with 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 of a cornering force “
Y” and
a vertical load “
Z”
acting at the center of each of the front and rear wheels;
(b) a controller for calculating in real time, as a result of an action of the driver on the operating means and taking into account the characteristic time, desired values of at least one reference parameter, said at least one reference parameter being correlatable to the actual values, said controller also 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 to minimize the error signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification