Zhou Guangmeng

Experimental study on performance of turbocharged diesel engine at high altitude

The performance of CY4102BZLQ turbocharged diesel engine with the HP60 turbocharger at different high altitudes was studied on the engine test bed for simulating high altitude (low air pressure). The conclusion indicated that the engine performance such as power and economy decreases with the increase of altitude, and the temperature of exhaust increases simultaneously. In addition, the rotational speed of the turbocharger and turbocharger ratio increase with the increase of altitude.

The Development of Engine High Altitude Simulating Test System

According to Chinese plateau atmosphere conditions, a high altitude simulating test system for diesel engine was developed. The system is consisted of cryogenic chamber, intake air low temperature simulation subsystem, intake and exhaust pressure simulation subsystem. The system can simulate atmospheric pressure from 101kPa to 47kPa and temperature from room temperature to-45°C, being capable of evaluating the high altitude performance of engine below 13L displacement. The system has been used successfully to evaluate the plateau matching performance of turbocharger and vehicle diesel engine.

Research on the interaction relationship between common rail diesel engine injection parameters based on neural network

High-altitude calibration of CA6DL2-35E3R common rail diesel engine was finished on engine high altitude simulating environment test bed. The interactions between injection parameters and its impact on engine high altitude performance were studied. Results show that the fuel delivery per cycle per cylinder increases with the adwance of injection timing and the increase of common rail pressure at the calibration sweep as a whole; fuel delivery per cycle per cylinder increased about 0.1–0.3 mg with advancing 1 ° CA injection timing and it would increase 0.07–0.1 mg with increasing 1 MPa common rail pressure averagely. The fitting error of constructed radial-based function neural network model was below 10−12 and the predictive error of which was between 1.5%, which can fulfill common rail diesel engine characteristics modeling demand. The model can help alleviate the influence of the injection timing and common rail pressure on fuel delivery per cycle per cylinder, and achieve the impact of one single injection parameter on engine performance, which can help increase the understanding of common rail diesel engine injection characteristics.

Experimental Study on Plateau Matching Performance of Turbocharger and Vehicle Diesel Engine

In order to improve the plateau adaptability of CY4102BZLQ-A2A turbocharged diesel engine, the matching performances of the diesel engine with TB28 and HP60 turbochargers at different altitudes (0 m, 2,000 m, 3,000 m, 3,500 m, 4,000 m) were investigated on the engine test bed for simulating high altitude (1ow atmosphere pressure). Results show that HP 60 turbocharger is more suitable to match the engine in terms of engine performance, intake air characteristics, turbocharger rotational speed etc. TB28 turbocharger is over speed when the engine runs at 3,500 m altitude and 2,600 r/min rotational speed, while HP60 turbocharger is over speed when the engine runs at 4,000 m altitude and 2,800 r/min rotational speed. No matter which turbocharger is selected to match the engine, the performance of the engine will deteriorate at different extents. The intake air flow mass and the air-fuel ratio decrease by 7.1-10.5% and 7.2-10.3% respectively with altitude increasing every 1,000 m. By contrast with 0 m altitude, engine torque and power at 4,000 m altitude decrease within 1% and the specific fuel consumption increases by 3.2-3.5% at the maximum torque speed, while the engine torque and power decrease by 4.6-5.3% and 4.5-5.2% respectively and the specific fuel consumption increases by 5.3-11.5% at higher and lower engine rotational speed.