Method and device for regulating the velocity of a vehicle
First Claim
1. A method for regulating a velocity of a vehicle, the method comprising:
- predefining a setpoint velocity of the vehicle;
detecting an actual velocity of the vehicle;
predefining, as a function of a difference between the actual velocity and the setpoint velocity, an output quantity of a drive unit of the vehicle so that the actual velocity is approximated to the setpoint velocity;
predefining a first lower limiting value to limit the output quantity at a lower end as long as the actual velocity exceeds the setpoint velocity by less than a first predefined threshold value; and
replacing, when the setpoint velocity is exceeded by the actual velocity by more than the first predefined threshold value, the first lower limiting value with a second lower limiting value, which is lower than the first lower limiting value, to limit the output quantity at the lower end.
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Accused Products
Abstract
A method and a device are described for regulating the velocity of a vehicle, which include a hysteresis function and prevent an unwanted activation and deactivation of the engine brake. For this purpose, a setpoint velocity (V-setpoint) of the vehicle is predefined. An actual velocity (V-actual) of the vehicle is detected and, as a function of the difference between the actual velocity (V-actual) and the setpoint velocity (V-setpoint), an output quantity (Msetpoint) of a drive unit of the vehicle is predefined in such a way that the actual velocity (V-actual) is approximated to the setpoint velocity (V-setpoint). A first lower limiting value (uG1) for limiting the output quantity (Msetpoint) toward the lower end is predefined as long as the actual velocity (V-actual) exceeds the setpoint velocity (V-setpoint) by less than a first predefined threshold value (offs1). When the actual velocity (V-actual) exceeds the setpoint velocity (V-setpoint) by more than the first predefined threshold value (offs1), the first lower limiting value (uG1) is replaced by a second lower limiting value (uG2) for limiting the output quantity (Msetpoint) at the lower end, this second lower limiting value being lower than the first lower limiting value (uG1).
11 Citations
12 Claims
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1. A method for regulating a velocity of a vehicle, the method comprising:
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predefining a setpoint velocity of the vehicle; detecting an actual velocity of the vehicle; predefining, as a function of a difference between the actual velocity and the setpoint velocity, an output quantity of a drive unit of the vehicle so that the actual velocity is approximated to the setpoint velocity; predefining a first lower limiting value to limit the output quantity at a lower end as long as the actual velocity exceeds the setpoint velocity by less than a first predefined threshold value; and replacing, when the setpoint velocity is exceeded by the actual velocity by more than the first predefined threshold value, the first lower limiting value with a second lower limiting value, which is lower than the first lower limiting value, to limit the output quantity at the lower end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for regulating a velocity of a vehicle, comprising:
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a difference forming arrangement to form a difference between a predefined setpoint velocity of the vehicle and a detected actual velocity of the vehicle; a first preselection arrangement to predefine an output quantity of a drive unit of the vehicle as a function of the difference so that the actual velocity approximates the setpoint velocity; a second preselection arrangement to predefine a first lower limiting value for limiting the output quantity at a lower end as long as the actual velocity exceeds the setpoint velocity by less than a first predefined threshold value, and to replace the first lower limiting value with a second lower limiting value, which is lower than the first lower limiting value, to limit the output quantity at the lower end when the setpoint velocity is exceeded by the actual velocity by more than the first predefined threshold value.
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Specification