Method and device for determining motor vehicle acceleration
First Claim
1. A method of determining acceleration of a motor vehicle, the method comprising:
- obtaining by measurement a first signal representing vehicle speed, differentiating, by a microprocessor, the first signal with respect to time, and low pass filtering, by the microprocessor, the first signal to provide a first filtered acceleration signal;
obtaining, by the microprocessor, a second filtered acceleration signal by calculating a net driving force acting on the vehicle, calculating an estimated vehicle acceleration from the net driving force, and high pass filtering the estimated vehicle acceleration; and
adding, by the microprocessor, the first and second filtered acceleration signals to obtain an output signal representing vehicle acceleration.
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Abstract
A method is disclosed for obtaining a signal representing motor vehicle acceleration. The method involves obtaining a high pass filtered vehicle acceleration signal and a low pass filtered vehicle acceleration signal. One of these signals (preferably the high pass filtered signal) is obtained based upon the net driving force applied to the vehicle, which can be used to obtain an estimate of acceleration by means of an adoptive vehicle model (28). The other signal is obtained by measurement, for example by differentiating a measured vehicle speed signal with respect to time. Adding the two filtered signals together gives a vehicle acceleration signal of potentially good quality.
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Citations
6 Claims
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1. A method of determining acceleration of a motor vehicle, the method comprising:
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obtaining by measurement a first signal representing vehicle speed, differentiating, by a microprocessor, the first signal with respect to time, and low pass filtering, by the microprocessor, the first signal to provide a first filtered acceleration signal; obtaining, by the microprocessor, a second filtered acceleration signal by calculating a net driving force acting on the vehicle, calculating an estimated vehicle acceleration from the net driving force, and high pass filtering the estimated vehicle acceleration; and adding, by the microprocessor, the first and second filtered acceleration signals to obtain an output signal representing vehicle acceleration. - View Dependent Claims (2, 3, 4, 5)
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6. A device for determining acceleration of a motor vehicle, the device comprising:
a microprocessor configured to receive a first signal representing measured vehicle speed, differentiate the first signal with respect to time, and cause the first signal to be low pass filtered to provide a first filtered acceleration signal, calculate a second filtered acceleration signal by calculating a net driving force acting on the vehicle, calculating an estimated vehicle acceleration from the net driving force, and high pass filtering the estimated vehicle acceleration, and add the first and second filtered acceleration signals to obtain an output signal representing vehicle acceleration.
Specification