Cruise control road speed control device with means for influencing fluctuations in control
First Claim
1. A cruise control road speed control device for a motor vehicle, comprising:
- a speed controller having a speed controller output signal (R);
a load adaptation element located outside of, and coupled to, said speed controller, said load adaptation element influencing a cruise control output signal (T) in an initial time period of a speed control phase;
wherein at an activation time (t0) of the speed control phase, said load adaptation element generates an initial engine load adaptation signal (L0) such that said cruise control output signal (T) based on the initial load adaptation signal (L0), takes over a driving force control signal (G) from a current position of an associated driving-force-determining positioning element at this point in time; and
wherein said initial engine load adaptation signal (L0) up to an end of the initial period of time of the speed control phase, drops to zero based on a linkage to the speed controller output signal (R).
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Accused Products
Abstract
A cruise control road speed control device optimizes the transient behavior during activation of speed control phases. The cruise control device has an additional device located outside the speed controller in the form of a load adaptation element. The load adaptation element sets the speed control output signal, upon activation of a speed control phase via an engine-load-adjusting additional signal, to a value that is required for a constant transition of the driving-force-determining control signal and in the subsequent transient phase of speed control with linkage to the output signal of the speed controller, for a return of this additional term to a value of zero, without the behavior of the speed controller being influenced thereby. This permits a very smooth transition from a previous driving phase into a cruise-control-determined speed control phase.
35 Citations
14 Claims
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1. A cruise control road speed control device for a motor vehicle, comprising:
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a speed controller having a speed controller output signal (R); a load adaptation element located outside of, and coupled to, said speed controller, said load adaptation element influencing a cruise control output signal (T) in an initial time period of a speed control phase; wherein at an activation time (t0) of the speed control phase, said load adaptation element generates an initial engine load adaptation signal (L0) such that said cruise control output signal (T) based on the initial load adaptation signal (L0), takes over a driving force control signal (G) from a current position of an associated driving-force-determining positioning element at this point in time; and wherein said initial engine load adaptation signal (L0) up to an end of the initial period of time of the speed control phase, drops to zero based on a linkage to the speed controller output signal (R). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a cruise control road speed control device for a motor vehicle having a speed controller providing a speed controller output signal (R) and, located outside of the speed controller and coupled thereto, a load adaptation element providing an engine load adaptation signal (L), the method comprising the steps of:
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generating an initial engine load adaptation signal (L0) at an activation time (t0) of a speed control phase such that a cruise control output signal (T) based on the initial engine load adaptation signal (L0) takes over a driving force control signal (G) from a current position of an associated driving-force-determining positioning element at the activation time; and reducing the initial engine load adaptation signal to zero based on a linkage to the speed controller output signal up to an end of an initial period of time of the speed control phase. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification