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Research on Strategy of Energy Management for Hydraulic Hybrid Vehicle

Author: WangZuo
Tutor: LiuZuoZuo
School: Jilin University
Course: Mechanical and Electronic Engineering
Keywords: Hybrid hydraulic Vehicle hydraulic pump/motor Energy Management Strategy Fuel Consumption Optimization and Simulation
CLC: U469.7
Type: PhD thesis
Year: 2011
Downloads: 183
Quote: 0
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Abstract

Hydraulic hybrid energy-saving auto technology is a kind of new typed transmission technology, this technology by changing the pump/motor inclined dish, which changes displacement Angle to adapt to load changes. Using hydraulic pump/motor quadrant operating characteristics, can effectively achieve the braking energy and recycle and reuse of gravity potential energy. When hybrid cars of all parts of the structure and properties of the characteristic, after the confirmation of the whole vehicle fuel economy and emission levels depends on energy management strategy.When hybrid cars of all parts of the structure and properties of the characteristic, after the confirmation of the whole vehicle fuel economy and emission levels depends on energy management strategy. At present hybrid cars in how to use energy management strategy of optimization, the greatest degree to reduce fuel consumption of the vehicle operation, and the accumulator SOC reasonable management, etc., and therefore still remain to be further research conduct energy management strategy for research to reduce fuel consumption and emissions hybrid car has important theoretical significance and application value.This research work in jilin province by the fund project "hydraulic secondary adjusting technology in auto saving application research" and the school-enterprise cooperation project "of energy-saving technology based on hydraulic concrete type mixing transporter development" as the background, mainly in hydraulic energy-saving auto vehicle energy management strategy, the greatest degree to reduce fuel consumption of the vehicle operation, and the accumulator SOC reasonable management thorough research, cooperation design modification a hybridto hydraulic hybrid vehicle concrete truck.Aiming at the hydraulic energy-saving auto main research work includes the following aspects:1. Introduces is in a stage of study or have completed the hydraulic hybrid vehicles at home and abroad, analyzes the energy of hydraulic hybrid control strategy research status. Explain the hydraulic hybrid control strategy for the purpose of the research energy and significance.2. Put forward equivalent engine and equivalent tank theory, this is a kind of parallel hydraulic hybrid vehicle fuel economy of optimization algorithm. This method satisfies the vehicle under the premise of the desired performance and improve the overall efficiency of the hybrid systems. And on equivalent theory on the basis of the equivalent model optimal solution and simulation3. In parallel type hydraulic hybrid cars equivalent model based on that, established hydraulic hybrid vehicle dynamic system each key components, driver speed mathematical model of fuzzy control model, and considering the vehicles in starting or shift process of speed control system of the clutch abate effect; Established can be used for simulation and real-time control of drivers demand drive power calculation model. Established hybrid transmission system dynamics equation. In the above model was developed based on simulation algorithm based on prior to the parallel type hydraulic hybrid vehicle performance simulation program.4. Completed the hydraulic hybrid cars driving condition of transient energy management strategy optimization study. Based on the proposed hydraulic hybrid cars equivalent model is established, the hybrid system is energized/put can comprehensive efficiency model. To reflect the regenerative braking energy recovery of energy management strategy of influence and the reduction of car fuel consumption, putting in the comprehensive efficiency can be introduced in the calculation model of regenerative braking energy recovery influence coefficients, analyzes the regenerative braking energy recovery influence coefficient of engine and the second component torque, and puts forward the influence of the distribution according to the size of the accumulator SOC determine the regenerative braking energy recovery influence coefficients. In order to reduce vehicle in the whole running condition of total consumption, but also according to the statistical law of the car running mode, through car in driving cycles of fuel economy simulation analysis to determine reasonable regenerative braking energy recovery influence coefficients.5. Completed based on driving cycles of energy management strategy and automobile fuel economy simulation analysis. To drive condition and braking condition of transient energy management based optimization strategy, combining the accumulator SOC management strategy (including SOC best use range defining, and the best filling/put can strategy), is proposed to reduce automobile operating conditions of fuel as target of energy management strategy. Use this energy management strategy, of hydraulic hybrid cars in the UDDS driving mode compared no-load and full load of fuel economy is forecasted and analysis. The results show that compared with traditional basic models, accumulator SOC remain at 50% ~ 70% range, which helps reduce UDDS driving cycles of fuel consumption.6. Complete hydraulic hybrid transmission systems and control experimental research. Completed hybrid transmission system from the start, continuous shift accelerated, uniform to deceleration control modes of the experiment, the experimental results verify the established hybrid cars simulation model and the effectiveness of energy control strategy.This paper mainly innovative work includes the following aspects:1. The forward parallel type hydraulic hybrid cars equivalent model, and based on the parallel type hydraulic hybrid systems of filling/put can comprehensive efficiency model. Put forward by the accumulator put can maximum overall efficiency optimization target release control strategy can working optimization model, and gives the regenerative braking energy recovery method to determine the influence coefficients.2. With transient energy management optimization strategy as the foundation, and combining the accumulator SOC management strategy, and puts forward can effectively reduce automobile in driving cycles oil consumption of energy management strategy. For vehicles driving cycles of initial value of SOC accumulator is different, the accumulator SOC management strategy requires circular running condition of SOC keep end in different accumulator rational range, and to reduce automobile driving cycles fuel as a goal, and put forward a method of determining the accumulator energized condition into conditions method.3. Using GPS/GIS and ITS offer real-time traffic information to vehicle minimum fuel consumption as optimization control object, this paper establishes the energy-saving hydraulic hybrid vehicle running mathematical model and hydraulic energy saving system dynamic programming equation of the dynamic programming, reverse algorithm are predictive control strategy.4. Established can be used for simulation and real-time control of drivers demand drive power calculation model. The pilot speed fuzzy control model, considering the automobile starting or shift process of speed control system of the clutch abate effect, make the simulation algorithm of the vehicles, prior to target speed can get good tracking.

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