The invention discloses a vehicle speed hard-line low-speed output method, which comprises the following steps of S1, calculating a vehicle speed overflow critical value, S2, calculating a vehicle speed to be output finally, S3, judging whether the vehicle speed overflows or not, automatically switching a corresponding vehicle speed output mode, smoothly outputting various vehicle speeds by a hard line, and if yes, outputting the vehicle speed. The vehicle speed overflow critical value is calculated according to related timer parameters in the vehicle, and the vehicle speed to be finally output is the wheel speed collected by a related wheel speed sensor in the vehicle. According to the invention, by comprehensively adopting a mode of simulating PWM output by hardware PWM output and software IO, compared with a traditional scheme which may overflow at a low speed, the scheme does not overflow, so that the range of the output frequency is increased, the output at an ultra-low speed is realized, and the continuity of the speed is not influenced when the output mode is switched. And function expansion can be realized by modifying software without modifying hardware and increasing cost.

    本发明公开了一种车速硬线低速输出方法,包括以下步骤:步骤S1、计算出车速溢出临界值,步骤S2、计算出最终要输出的车速,步骤S3、判断车速是否溢出,自动切换对应的车速输出模式,硬线平滑的输出各种车速,所述计算出车速溢出临界值为根据车辆中相关定时器参数计算出车速溢出临界值,所述计算出最终要输出的车速为车辆中相关的轮速传感器采集轮速。本发明通过综合采用硬件PWM输出和软件IO模拟PWM输出的方式,相较于传统的方案在低车速时可能会溢出,本方案不会溢出,从而增加了可输出频率的范围,实现了超低车速的输出,在输出方式切换时不会影响车速的连续性。无需修改硬件,增加成本,通过修改软件即可实现功能的扩展。


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    Title :

    Vehicle speed hard wire low-speed output method


    Additional title:

    一种车速硬线低速输出方法


    Contributors:
    TAO RUIRAN (author) / ZHU ZHENG (author)

    Publication date :

    2022-07-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion



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