Dual-pump Control Algorithm of Two-speed Powershift Transmissions in Electric Vehicles

IF 4.8 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Automotive Innovation Pub Date : 2021-11-12 DOI:10.1007/s42154-021-00160-2

Yanfang Liu, Lifeng Chen, Tianyuan Cai, Wenbo Sun, Xiangyang Xu, Shuhan Wang

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Abstract

A high-speed motor in a drive system causes several challenges to the reliability of the mechanical parts of electric vehicles and leads to issues with noise, vibration and harshness (NVH). Thus, a two-speed powershift transmission is considered an effective way to improve the dynamic, economic and comfort performance of electric vehicles. A newly designed dual-pump hydraulic control system for a two-speed powershift transmission with two wet clutches is presented, in which the mechanical oil pump is linearly affected by the vehicle speed and the electric oil pump is controllable. By integrating the dynamic model of the hydraulic system into one of the powertrains with a two-speed transmission, a co-simulation dynamic model is proposed. To satisfy the flow and pressure demand of the hydraulic system, a dual-pump control strategy is presented, in which the electric oil pump is controlled by the mechanical oil pump following the minimum energy consumption principle. The World Light Vehicle Test Procedure (WLTP) cycle simulation results show that the energy consumption of the proposed hydraulic system can be reduced by 58.2% compared to the previous single-pump system developed by the authors with a constant main-line pressure control strategy. On the basis, the best configuration of the two pumps can further reduce the energy consumption of the hydraulic system by 23.2% compared to that of two-oil pumps with preset displacement.

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电动汽车双速换挡变速器的双泵控制算法

驱动系统中的高速电机对电动汽车机械部件的可靠性提出了若干挑战，并导致噪音、振动和粗糙度(NVH)问题。因此，双速动力换挡变速器被认为是提高电动汽车动力性、经济性和舒适性的有效途径。针对双湿式离合器双速动力换挡变速器，设计了一种机械油泵受车速线性影响、电动油泵可控的双泵液压控制系统。将液压系统的动力学模型集成到一个双速传动的动力系统中，建立了联合仿真动力学模型。为了满足液压系统的流量和压力需求，提出了一种双泵控制策略，即按照能耗最小的原则，由机械油泵控制电动油泵。世界轻型车辆试验程序(WLTP)循环仿真结果表明，采用恒定主线压力控制策略的液压系统能耗比先前开发的单泵系统降低58.2%。在此基础上，与预置排量的双油泵相比，双油泵最佳配置可进一步降低液压系统能耗23.2%。

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来源期刊

Automotive Innovation Engineering-Automotive Engineering

CiteScore

8.50

自引率

4.90%

发文量

期刊介绍： Automotive Innovation is dedicated to the publication of innovative findings in the automotive field as well as other related disciplines, covering the principles, methodologies, theoretical studies, experimental studies, product engineering and engineering application. The main topics include but are not limited to: energy-saving, electrification, intelligent and connected, new energy vehicle, safety and lightweight technologies. The journal presents the latest trend and advances of automotive technology.