Calculation method of vehicle speed
A calculation method and vehicle speed technology, applied to devices using electric/magnetic methods, can solve problems such as uneven signal plate tooth width, vehicle speed fluctuations, periodic fluctuations in vehicle speed sensor pulse signals, etc., to improve control effects and solve problems. wear effect
Active Publication Date: 2019-05-21
LIANCHUANG AUTOMOBILE ELECTRONICS
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Problems solved by technology
[0006] Due to the difference of the signal plate itself or the wear and tear of long-term use, the uneven tooth width of the signal plate will cause periodic fluctuations in the pulse signal output by the vehicle speed sensor, and the calculated vehicle speed will also fluctuate periodically
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[0019] Such as figure 1 As shown, the vehicle speed calculation method provided by the present invention comprises the following steps:
[0020] 1) Carry out linear interpolation calculation on the current vehicle speed value to obtain the filter parameters corresponding to the current vehicle speed;
[0021] 2) Recording the number of pulses and the pulse period of the vehicle speed sensor within the preset time interval according to the preset time interval, respectively accumulating and summing the recorded number of pulses and the pulse period to obtain the sum of the accumulated pulse number and the sum of the accumulated pulse period; When the sum of the accumulated pulse numbers is greater than the filter parameter calculated in step 1), the average pulse period of the vehicle speed sensor at the current preset time interval is calculated, and the average pulse period of the current preset time interval = the sum of the accumulated pulse periods of the current preset ti...
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The invention discloses a vehicle speed calculation method. The vehicle speed calculation method comprises steps that 1), a vehicle speed filtering parameter is acquired; 2), pulse quantities and pulse periods are acquired according to preset time intervals, and sum of the pulse quantities and sum of the pulse periods are calculated; when the sum of the pulse quantities is greater than the filtering parameter, an average pulse period for the present preset time interval is calculated; 3), if no pulse rising edge exists within the preset time interval, the sum of the pulse quantities and the sum of the pulse periods are kept to be unchanged; when the unchanging continuity time of the sum of the pulse quantities surpasses a first preset time threshold, RampDown processing on a vehicle speed is carried out; and 4), when an absolute value of difference of the average pulse period for the present preset time interval and a pulse period for a previous preset time interval is greater than a limit amplitude, the vehicle speed is acquired through utilizing the pulse period for the previous preset time interval for calculation; when the vehicle speed continuity time acquired through utilizing the pulse period for the previous preset time interval surpasses a second preset time threshold, the vehicle speed is acquired through utilizing the average pulse period of the step 2) for calculation.
Description
technical field [0001] The invention relates to the field of automobiles, in particular to a method for calculating vehicle speed. Background technique [0002] Vehicle speed is an important parameter in the engine control system. The on-board ECU controls the engine speed, gear recognition, cruise control and other functions through the vehicle speed signal. The accuracy and stability of the vehicle speed signal directly reflects the effect of engine control. [0003] At present, the commonly used speed calculation method in the industry is: [0004] After the pulse signal output by the vehicle speed sensor is amplified and rectified, the rotational speed is calculated according to the period of the pulse signal, and then converted into the vehicle speed. [0005] Problems with the above method: [0006] Due to the difference of the signal plate itself or the wear and tear of long-term use, the uneven tooth width of the signal plate will cause the pulse signal output by ...
Claims
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IPC IPC(8): G01P3/54
Inventor 张琨
Owner LIANCHUANG AUTOMOBILE ELECTRONICS