Abstract
The results of modeling and bench testing friction losses in the main engine kinematic nodes for different lubricating oil temperature values was presented in the article. The study was performed to evaluate the effect of lubricating oil temperature on the engine friction losses. In addition to friction losses in the crankshaft bearings and the piston rings in a cylinder-piston group the friction loss due to charge exchange in the cylinder, drive of timing system and the oil pump were measured. The obtained results show the course of the friction loss in the combustion engine. The research shows that the thermal state of the engine lubricating oil has effect on the amount of friction losses. Formulated conclusions allow to assess the impact of the oil temperature on the friction losses in the main friction nodes in combustion engine.
Highlights
Every year the number of vehicles on the roads and highways increases
The performed research lead to formulating the following conclusions: – oil temperature measured in the oil sump is reliable in the description of the processes of friction, – oil temperature has a big influence on the friction loss and other motion resistance in engine
The higher the viscosity of the oil is, the higher the friction loss in an internal combustion engine, – oil viscosity is important for the operation of the oil pump
Summary
Every year the number of vehicles on the roads and highways increases. Distances traveled by cars are often small, because the drivers move only in the urban area. A large number of lights on streets often creates congestion In such traffic conditions, the engines of motor vehicles operate under idle and low loads, generating mechanical losses a relatively large value. The engines of motor vehicles operate under idle and low loads, generating mechanical losses a relatively large value It mainly translates into an increased amount of fuel consumption and exhaust emissions. Referring to the small distances that the vehicle passes, it is not possible for an internal combustion engine to achieve optimum operating temperature. It has a great influence on the friction loss generated in the drive unit [1, 2]. The article presents the methodology and the results of model and bench testing friction losses in the engine combustion conditions of engine dynanometer variants for different temperatures of lubricating oil and engine speeds
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