A method for testing the rotating speed lifting transient performance of an engine under a fixed torque condition

Abstract

The invention discloses a method for testing the rotating speed lifting transient performance of an engine under a fixed torque condition. The method comprises following steps. (1) An engine to be tested is connected with a dynamometer. (2) The engine operates in an idling state. (3) A fixed torque less than a maximum load capacity in the idling state is applied to the engine. The engine stably operates at least five minutes under the fixed torque. In the meantime, the output characteristic of the engine is detected after the applied torque is steady. (4) The accelerator of the engine is lifted from a idling position to a hundred percent position and is maintained at least thirty seconds. In the meantime, the output characteristic of the engine is detected in a process from the time when the accelerator begins to be lifted to the time when the thirty seconds end. (5) The accelerator is returned from the hundred percent position to the idling position and the engine operates stably at least one minute. The returning time of the accelerator is controlled to be two seconds and the output characteristic of the engine is detected when the accelerator returns. (6) The steps (2) and (5) are repeated at least three times. The method is capable of accurately testing the transient output characteristic of the engine under a condition of fixed torque so as to provide accurate reference data for an engineer.

Description

technical field [0001] The invention relates to a method for testing the transient performance of an engine, in particular to a method for testing the transient performance of the engine at a constant torque and rotating speed. Background technique [0002] The output characteristics of the engine are the most important indicators to measure the performance of the engine. The current widely used test method is to use equipment such as a dynamometer under laboratory conditions to detect the output characteristics of the engine under the steady state of the engine. The results of this test method reflect the average output characteristics of the engine over a period of steady operation. But in practice, especially the engine of construction machinery, it is affected by transient conditions such as road surface roughness, road pavement resistance, impact load, and frequent start and stop, and the load of the engine is a constantly changing value. Therefore, the construction ma...

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Problems solved by technology

[0003] The engine output characteristics obtained by traditional test methods cannot reflect the transient output characteristics of the engine, and cannot meet the evaluation of this transient demand, so it can only be improved after blind loading test, resulting in a long engine development cycle, and The repeatability of the vehicle test conditions is difficult to maintain consistency, which can easily lead to misjudgment

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