The invention relates to the technical field of anti-overspeed control of loaders, in particular to a downhill anti-overspeed control system of a hydrostatic loader. The system comprises an ECU and a TCU. An anti-overspeed protection function is set in the system, the ECU collects the rotating speed of an engine and interacts with the TCU, the TCU collects the speed of the whole machine and the gear of the whole machine, and the TCU decides whether to operate speed reduction protection or not according to a written-in overspeed protection strategy: according to the operation condition of speed reduction protection, the gear of the whole machine is at the high gear; the rotating speed of the engine is greater than a limit value nmin; the speed of the whole machine is larger than the speed reduction initial value Vmin, and Vmin is larger than the speed corresponding to the maximum rotating speed nmax of the engine when the whole machine works on the flat ground. And when all the three operation conditions are met, the TCU operates speed reduction protection to enable the ECU to control the engine to reduce the speed so as to carry out overspeed protection on the whole machine. In the overspeed protection strategy, a speed reduction end value Vmax when the vehicle speed is larger than Vmin is further set, and after the TCU operates speed reduction protection to enable the speed of the engine to be reduced, the ECU controls the rotating speed of the engine to be nmin before the vehicle speed is increased to Vmax.
本发明涉及一种装载机防超速控制技术领域,具体是一种静液压装载机下坡防超速控制系统。该系统包括ECU和TCU。系统内设置防超速保护功能,ECU采集发动机转速并与TCU进行交互,TCU采集整机车速和整机档位,TCU根据写入的超速保护策略决定是否运行降速防护:降速防护运行条件:整机档位在高速档;发动机转速大于限定值nmin;整机车速大于降速起始值Vmin,Vmin大于整机平地作业时发动机最大转速nmax对应的车速。以上三个运行条件全部满足时,TCU运行降速防护使得ECU控制发动机降速以对整机进行防超速保护。超速保护策略中还设定车速大于Vmin的降速结束值Vmax,当TCU运行降速防护使发动机降速后,在车速升至Vmax前ECU控制发动机转速将至nmin。
Downhill overspeed prevention control system of hydrostatic loader
一种静液压装载机下坡防超速控制系统
2022-07-29
Patent
Electronic Resource
Chinese
IPC: | B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES |