Papers by Author: Bing Liu

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Authors: Xi Qin Li, De Yu Song, Bing Liu
Abstract: Endurance test of vehicle transmission usually takes long time and spends a lot of electric energy. In order to save energy, a new kind of transmission endurance tester equipped with a DC brake motor and a digital DC reversible speed governor is developed. The tester can transfer electricity generated by the brake motor back into the electric grid. The experiment result shows that the average ratio of electricity recycle is as high as 68 percent. The tester can be used for transmission endurance test of various kinds of construction machineries and vehicles.
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Authors: Xi Qin Li, De Yu Song, Bing Liu, Qiang Li
Abstract: : In order to investigate the effect of ignition advance angle and LPG injecting methods on an LPG engine performance, three methods of injecting LPG were tested on an LPG engine. The injection methods were gaseous phase LPG injection at intake port, liquid phase LPG injection at intake port, and liquid phase LPG in-cylinder direct injection. The maximum torque developed with liquid phase LPG engine direct injection, was 12.6% higher than gaseous phase LPG injection at inlet port. The ignition advance angle clearly affected LPG engine torque and emissions. The optimum ignition advance angle for LPG engine torque was about 26º CA. The LPG engine emitted many HC and CO emissions when the ignition advance angle increased greatly.
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Authors: Xi Qin Li, Su Yan Cai, Bing Liu, Xue Qun He
Abstract: To reduce emissions, CNG engines are commonly equipped with three-way catalytic converters. However when the engines run at transient conditions, the air fuel ratio can not be precisely controlled at theoretical value by traditional means, so the catalytic converters can not achieve their desired effect. This paper presents a new method for CNG engines to control air fuel ratio at transient conditions. The moments which intake and exhaust valves open are used as the trigger signals for ECU to collect the test data simultaneously. The dynamic information of CNG engine is detected by multiple sensors; the nonlinear coupling relationship between air fuel ratio of CNG engine and the operating conditions are established through information fusion and neural network control. The requirement of real time control for air fuel ratio is achieved, so the emissions of CNG engines are reduced further.
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