为开发基于无级自动变速器（Continuously variable transmission，CVT）的混合动力变速箱液压系统，分析对比目前基于CVT的混合动力量产车型所采用的液压系统供油方案，结合混合动力变速箱实现纯电动行驶的功能需求及进一步降低液压系统能量消耗的需要，提出采用电动油泵作为混合动力CVT液压系统动力源的供油方案；并通过仿真方式对比电动油泵方案与其他几种供油方案在NEDC循环工况下的能量消耗情况，仿真表明采用电动油泵能够较其他方案减少更多的油泵能量消耗。为进一步验证采用电动油泵的节能效果，开发1台基于电动油泵的混合动力CVT，并通过台架试验的方式测定采用电动油泵与机械油泵供油方案在1 500 r/min时的效率情况，结果表明电动油泵方案相比机械泵供油方案可以明显提升变速箱效率，在输入转矩150 N·m时，电动油泵方案能够较机械泵供油方案提升变速箱效率3.72%。最后基于开发的混合动力变速箱搭载1台样车进行实车测试，验证采用电动油泵的实际可行性。
刘云峰
,
周云山
,
瞿道海
,
王建德
,
傅兵
,
张飞铁
. 基于电动油泵的混合动力CVT能耗对比分析[J]. 机械工程学报, 2018
, 54(14)
: 125
-131
.
DOI: 10.3901/JME.2018.14.125
In order to develop the hydraulic system of CVT-based hybrid transmission, several oil supply schemes in the mass production hybrid vehicles based on CVT are analyzed and compared with the scheme proposed in the paper. Considering the demands of transmission to implement electric drive mode and decreasing energy consumption of hydraulic system, the electric oil pump supply plan is put forward. Simulations are designed to compare the energy consumption of different scenarios. Results show that the electric oil pump can reduce much more energy consumption than other schemes. To further verify the energy-saving effect of the electric oil pump scheme, a hybrid CVT based on it is developed. The efficiency of the transmission based on the electric oil pump and the mechanical oil pump supply schemes are tested by a bench test at 1 500 r/min. The experimental data show that the electric oil pump scheme can significantly improve the transmission efficiency compared with the mechanical oil pump supply scheme. When the input torque of CVT is 150 N·m, the electric oil pump scheme can improve the transmission efficiency by 3.72% compared with the mechanical oil pump. Finally, a test car equipped with the hybrid CVT is developed to test, and the results show the feasibility of the electric oil pump scheme.
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