Vehicle deceleration by engine control followed by brake control
First Claim
1. A method for controlling a vehicle, the vehicle including a first control unit for controlling an engine power and a second control unit for controlling a braking power, the first control unit and the second control unit cooperating to control a travel speed of the vehicle, the method comprising the steps of:
- determining an engine torque and a tractive resistance torque;
decreasing the engine power with the first control unit as a function of the tractive resistance torque and the engine torque, in order to decrease the travel speed of the vehicle toward a setpoint speed; and
increasing the braking power with the second control unit if decreasing the engine power does not conform the travel speed to the setpoint speed.
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Accused Products
Abstract
A method and a device are described for controlling a vehicle. The engine output is able to be influenced by a first control unit. The braking power is able to be influenced by a second control unit. Both control units cooperate along the lines of a vehicle speed control or a vehicle speed limitation. It is assessed on the basis of at least one of the variables, rpm, speed, acceleration, injected fuel quantity, and/or throttle valve position, whether it suffices to throttle back engine power in order to adhere to a setpoint speed. If indicated, the second control unit increases the braking power.
45 Citations
10 Claims
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1. A method for controlling a vehicle, the vehicle including a first control unit for controlling an engine power and a second control unit for controlling a braking power, the first control unit and the second control unit cooperating to control a travel speed of the vehicle, the method comprising the steps of:
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determining an engine torque and a tractive resistance torque; decreasing the engine power with the first control unit as a function of the tractive resistance torque and the engine torque, in order to decrease the travel speed of the vehicle toward a setpoint speed; and increasing the braking power with the second control unit if decreasing the engine power does not conform the travel speed to the setpoint speed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for controlling a vehicle, comprising:
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(a) a first control unit for controlling an engine power; (b) a second control unit for controlling a braking power, the first control unit cooperating with the second control unit for one of controlling and limiting a speed of the vehicle; (c) a measuring device for detecting a travel speed and a setpoint speed of the vehicle; and (d) an evaluating device for determining an engine torque and a tractive resistance torque, the first control unit varying the engine power as a function of the tractive resistance torque and the engine torque, the engine power being varied for substantially matching the travel speed with the setpoint speed, the second control unit increasing the braking power if the setpoint speed cannot be matched with the travel speed by varying the engine power. - View Dependent Claims (9, 10)
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Specification