Research on Conflict Decision between Shift Schedule and Multienergy Management for PHEV with Automatic Mechanical Transmission under Special Driving Cycles

Junqiang Xi,Yongdan Chen

doi:10.1155/2013/517387

Abstract

In order to satisfy the character of parallel hybrid electric vehicle (PHEV) in some special driving cycles, a collision decision problem between the shift decision and power split ratio is proposed. Based on a large amount of experimental data the optimal decisions are determined with evidential reasoning theory. The proposed decision strategy has been verified through real road test of Chongqing public transportation line 818 and the fuel economic improvement has also been achieved.

Highlights

The so-called special driving cycles of hybrid buses traveling refers primarily to climbing a big slope and/or rapid acceleration
The evidential reasoning approach was first proposed by the University of Manchester, UK, Jian-Bo Yang in 1994; he first proposed a basic evidential reasoning model [6], which theoretical foundation is based on the Dempster-Shafer evidence theory as well as multi-attribute decision-making analysis framework [7]
The evidential reasoning approach put forward by Yang and Sen has a good effect on solving multi-attribute decisionmaking problems which contain both quantitative index and qualitative index; the reliability matrixes based on Figure 3 and evidence combination rule are used to fuse the evaluation value of various index in the problem of multi-attribute decision-making

Summary

Introduction

The so-called special driving cycles of hybrid buses traveling refers primarily to climbing a big slope and/or rapid acceleration (or kickdown). When parallel hybrid electric bus is faced with such special driving cycles, the traction motor of hybrid powertrain allows short-term overload In this case there are two mutually exclusive decision-making options: (1) multienergy power spilt management and (2) gear changing. The regulation of the Chinese urban road design code CJJ37-1990 states that “the maximum longitudinal limiting value is 9% in the urban road [1],” in some mountain cities (such as Chongqing etc.) it is 15% This can be attributed to the influence of topographical factors, which implies that the bus often needs to climb a big slope and the up gradient will cause a deceleration of nearly 1.5 m/s2. There is an urgent need to research on shift schedule and multi-energy power split management decision-making under special driving cycles for hybrid buses. This paper will study the problem of task conflict in hybrid buses while climbing big slope by applying the multiattribute decision-making theory

Mathematical Description of Task Conflict under Special Driving Cycles

Conflict Task Decision-Making Based on the Evidential Reasoning Approach

An Instance for Decision-Making of Task Conflict

Conclusions