Abstract
The hybrid vehicle is a new type of green and energy efficient vehicle. Hydraulic accumulator and variable pump/motor make up the break energy regeneration utilization system, which is the core of hydraulic auxiliary driving unit. The hybrid drive system is composed of hydraulic auxiliary driving unit and the original vehicle drive system. As it relates to the recovery of the braking energy and the situation of two kinds of power-driven vehicle, it brings complexity to the hybrid distribution strategy, and an efficient energy control system is necessary. Based on CAN bus technology, using the CAN2.0B communication protocol for the system design, the core hardware system is composed of PC/104 computer and CAN communication card, the key nodes of hydraulic auxiliary drive unit use DSP chip TMS320LF2407. Experiments show that the system has a high communication reliability and high accuracy of dynamic coupling, the safety of vehicles and the best energy matching.
Highlights
With the social development, green and energy efficient vehicle is an important direction of automobile industry
With characteristics of being real-time, high error detection capability, simple connection, strong expansibility [1, 2] and so on, CAN bus technology is suitable for complex dynamic matching and network security requirement of hydraulic hybrid vehicle [3]
The control system structure of hydraulic hybrid vehicle based on CAN bus communication is shown in Fig. (1)
Summary
The control system of hydraulic hybrid vehicle is a distributed and embedded field bus control system, with the smaller PC104 industrial computer as the host computer; the system could achieve high level management and optimal control. The master-slave response communication of 250 kbps baud rate is used in vehicle bus layout, this resulted in the decreased utilization of channel, but the realtime data transmission between host computer and critical nodes of power source is guaranteed. The control system structure of hydraulic hybrid vehicle based on CAN bus communication is shown in Fig. The control system structure of hydraulic hybrid vehicle based on CAN bus communication is shown in Fig. (1)
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