Vehicle speed limitation method and vehicle speed limitation system based on retarder

A vehicle speed limit and retarder technology, applied in control/adjustment systems, speed/acceleration control, instruments, etc., can solve the problem of difficulty in grasping the opening timing of the retarder, avoid long-term braking, not easy to wear, and improve driving. safe effect

Active Publication Date: 2017-07-28
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the retarder is manually controlled, and it is difficult to grasp the opening timing of the retarder

Method used

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  • Vehicle speed limitation method and vehicle speed limitation system based on retarder

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Embodiment Construction

[0044] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For ease of understanding, the following description will be made in conjunction with the vehicle speed limiting method and the vehicle speed limiting system, and the beneficial effects will not be discussed repeatedly.

[0045] This embodiment provides a vehicle speed limiting system, which includes a retarder, a controller and a vehicle speed detection element connected thereto, and the vehicle speed detection element outputs a detected vehicle speed signal to the controller. The limited vehicle speed, and the torque calibration value and / or the first vehicle speed calibration value are also prestored in the controller, and the controller can obtain the vehicle speed limited torque. When the controller judges that at leas...

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Abstract

The invention discloses a vehicle speed limiting method and system based on a retarder. The vehicle speed limiting method comprises the following steps that vehicle speed limit torque is obtained, meanwhile, set calibration values are pre-stored, and / or vehicle speed and vehicle speed limit are obtained, in addition, a first vehicle speed calibration value is set, and the retarder is turned on when at least one condition in the following two conditions is met, wherein according to the first condition, the vehicle speed limit torque is smaller than the torque calibration values; according to the second condition, the vehicle speed is larger than the sum of the vehicle speed limit and the first vehicle speed calibration value. According to the vehicle speed limiting method and system, the controller automatically turns on the retarder according to the vehicle speed and / or the vehicle speed limit torque so that the purpose of braking can be achieved when the function of the maximum vehicle speed limiting fails, in this way, the driving safety of a vehicle is improved, and braking for a long time is also avoided.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a retarder-based vehicle speed limiting method and a vehicle speed limiting system. Background technique [0002] At present, the vehicle speed limit mainly depends on the maximum speed limit function of the engine ECU (Electronic Control Unit). [0003] The ECU has set a maximum vehicle speed. When the actual vehicle speed is about to approach the set maximum vehicle speed, the maximum vehicle speed limit torque is obtained through PI (proportional integral) adjustment, and then the torque required by the pedal is smaller, which is used for the final fuel injection conversion. [0004] The maximum speed limit function can effectively limit the vehicle speed below the maximum speed limit in stable road conditions, but in downhill and other complex working conditions, even if the engine stops fuel injection, the vehicle speed will continue to increase, and the PI adjustment of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K31/00
Inventor 曹石李少佳吴速超李兵
Owner WEICHAI POWER CO LTD
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