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The power hybridization characteristics of LPG-HEV city buses in real world and the relation between degree of hybridization (DOH) and vehicle operating conditions are studied in this paper. A series of on-board tests were performed on LPG-HEV buses operated in Guangzhou City, China. Portable Emission Measurement System (PEMS) and CAN-BUS were used to sample vehicle and power battery parameters and information, such as instantaneous speed and torques of engine and motor, vehicle speed and working states of power batteries, etc. Vehicle acceleration, driving power and DOH were calculated based on the experimental data. The relationships between vehicle operating conditions, working states of power batteries and DOH were analyzed. The study results show that the LPG-HEV city buses are mainly operated at the DOH range from 15% to 40%, it means that the hybridization is moderate. In starting stage, DOH reached the maximum which is higher than 80% when the speed is less than 2km/h.

It was developed an eco-driving cycle for an energy saving race car. A fuel consumption simulation model of race car was established to simulate the real engine and vehicle performance based on driving rules and racing track condition. It was studied the effects of engine throttle opening and the vehicle speed in acceleration and deceleration modes on fuel consumption. Several driving schemes were proposed and compared, the optimum results are as follows: with lowest fuel consumption, the engine throttle opening is 60% to 80%, the vehicle speed range is 5 to 65km/h during acceleration and deceleration modes. In addition, the race car should coast in neutral fully at deceleration mode within the allowable running time of the racing rules. An eco-driving cycle was designed based on the optimum results. The simulating results show that the race car fuel consumption with the eco-driving cycle can be reduced by 37% comparing with previous one.