Effects of low pressure lubrication system on the reliability and economy of a diesel engine
To analyze the impact of low pressure lubrication system on the reliability and economy of diesel engines,a heavy-duty diesel engine lubrication system is taken as the research object.The effects of reducing oil pressure on piston temperature,main bearing temperature rise,oil temperature rise,fuel consumption rate,etc.are analyzed through simulation,temperature measurement tests,and bench tests.The simulation results show that the temperature of the piston is not significantly affected by the oil pressure and the flow rate of the piston nozzle.The temperature rise of engine oil is greatly affected by engine oil pressure.Reducing engine oil pressure increases the risk of engine oil deterioration and coking.The temperature rise of the main bearing and connecting rod large end bearing is lower than the design limit.The temperature measurement test results show that the piston temperature is not significantly affected by the oil pressure,and the temperature rise of the main bearing meets the design requirements.The bench test results show that in the commonly used working area,the oil pressure drops from 412 kPa to 240 kPa,and the maximum decrease in fuel consumption rate is about 0.9 g/(kW·h).The application of low pressure lubrication system can improve fuel efficiency while meeting the reliability requirements of diesel engines.
lubrication systemoil pressurefuel economyaccessory power consumptionfriction work
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