Traction and Cornering Properties of a Motor Vehicle
First Claim
1. A control method for a motor vehicle (1) having a front wheel drive and an electronically controllable locking differential (2) during cornering, comprising the steps of:
- calculating a movement model of the motor vehicle (1) referenced to control presettings of a driver of the motor vehicle (1);
measuring a lateral movement parameter of the motor vehicle (1);
determining a deviation of a measured lateral movement parameter from a modeled lateral movement parameter of the movement model;
determining a deviation between a rotational speed of a front wheel (3) which is on an inside during cornering from a rotational speed of a front wheel (4) which is on an outside during cornering;
reducing the deviation between the rotational speeds provided (i) the rotational speed of the front wheel (3) which is on the inside is not lower than the rotational speed of the front wheel (4) which is on the outside and (ii) the measured lateral movement parameter deviates from the modeled lateral movement parameter;
reducing the rotational speed of the front wheel which is on the inside provided (i) the rotational speed of the front wheel which is on the inside is lower than the rotational speed of the front wheel which is on the outside and (ii) the measured lateral movement parameter deviates from the modeled lateral movement parameter;
wherein reduction of the deviation between the rotational speeds or reduction of the rotational speed of the front wheel which is on the inside takes place as a function of operating parameters of the motor vehicle (1) determined during cornering by applying a locking torque to the locking differential (2) and/or by single-sided braking of at least one wheel (3, 5), which is on the inside during cornering, of the motor vehicle (1).
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Accused Products
Abstract
A method for controlling cornering of a motor vehicle having a front wheel drive and an electronically controllable locking differential. A motion model of the motor vehicle is calculated on the basis of the control inputs of a vehicle driver, a lateral movement parameter of the motor vehicle is measured. Deviations of the measured lateral movement parameter to the modeled movement, and the rotational speed of a front wheel which is on the inside during cornering from such a rotational speed of a front wheel which is on the outside are determined. The deviations are reduced if the rotational speed of the front wheel which is on the inside is not lower than the rotational speed of the front wheel which is on the outside, and if the measured lateral movement parameter deviates from the modeled lateral movement parameter. Reduction of the deviation is carried out by applying a locking torque to the locking differential and by single-sided braking of at least one wheel.
26 Citations
17 Claims
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1. A control method for a motor vehicle (1) having a front wheel drive and an electronically controllable locking differential (2) during cornering, comprising the steps of:
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calculating a movement model of the motor vehicle (1) referenced to control presettings of a driver of the motor vehicle (1); measuring a lateral movement parameter of the motor vehicle (1); determining a deviation of a measured lateral movement parameter from a modeled lateral movement parameter of the movement model; determining a deviation between a rotational speed of a front wheel (3) which is on an inside during cornering from a rotational speed of a front wheel (4) which is on an outside during cornering; reducing the deviation between the rotational speeds provided (i) the rotational speed of the front wheel (3) which is on the inside is not lower than the rotational speed of the front wheel (4) which is on the outside and (ii) the measured lateral movement parameter deviates from the modeled lateral movement parameter; reducing the rotational speed of the front wheel which is on the inside provided (i) the rotational speed of the front wheel which is on the inside is lower than the rotational speed of the front wheel which is on the outside and (ii) the measured lateral movement parameter deviates from the modeled lateral movement parameter; wherein reduction of the deviation between the rotational speeds or reduction of the rotational speed of the front wheel which is on the inside takes place as a function of operating parameters of the motor vehicle (1) determined during cornering by applying a locking torque to the locking differential (2) and/or by single-sided braking of at least one wheel (3, 5), which is on the inside during cornering, of the motor vehicle (1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A motor vehicle (1) including:
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a front wheel drive; an electronically controllable locking differential (2); and a control unit (7) which is configured to calculate a movement model of the motor vehicle (1) with reference to control presettings of a vehicle driver of the motor vehicle (1);
measure a lateral movement parameter of the motor vehicle (1);
determine a deviation of a measured lateral movement parameter from a modeled lateral movement parameter of the movement model;
determine a deviation between a rotational speed of a front wheel (3) which is on an inside during cornering from a rotational speed of a front wheel (4) which is on an outside during cornering;
reduce the deviation between the rotational speeds provided (i) the rotational speed of the front wheel (3) which is on the inside is not lower than the rotational speed of the front wheel (4) which is on the outside and (ii) the measured lateral movement parameter deviates from the modeled lateral movement parameter; and
reduce the rotational speed of the front wheel which is on the inside provided (i) the rotational speed of the front wheel which is on the inside is lower than the rotational speed of the front wheel which is on the outside and (ii) the measured lateral movement parameter deviates from the modeled lateral movement parameter.
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Specification