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Method for evaluating torque fluctuation of diesel engine at constant rotating speed

A diesel engine, constant speed technology, applied in engine control, machine/engine, mechanical equipment, etc., can solve problems such as diagnosis and detection of engine vibration, engine calculation and evaluation, and increase in vehicle cost that cannot be uniformly quantified, and achieves the evaluation method. Convenient and accurate, fast recording and evaluation, simple effect of speed collection

Active Publication Date: 2021-07-13
上海新动力汽车科技股份有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

This detection method mainly detects the torque fluctuation generated by each key node in the power transmission process of the transmission system, does not calculate and evaluate the structural characteristics and injection characteristics of the engine, and cannot uniformly quantify the vibration of the engine and perform diagnostic detection; and the detection device It is necessary to install six additional speed sensors, ring gears, a computer and corresponding acquisition supporting equipment, resulting in an increase in the cost of the vehicle

Method used

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  • Method for evaluating torque fluctuation of diesel engine at constant rotating speed

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Embodiment 1

[0071] In this embodiment, the diesel engine is integrated with an electronic control system, and has a built-in crankshaft sensor. c It is 6, marked as No. 1 working cylinder, No. 2 working cylinder, No. 3 working cylinder, No. 4 working cylinder, No. 5 working cylinder, No. 6 working cylinder.

[0072] Step 1: The ECU divides one working cycle of the diesel engine into 6 working zones, and sets the upper limit value A of the speed fluctuation of the diesel engine, where A=4%.

[0073] Step 2: Take the 6 working partitions as 6 sampling points, and collect the partition time T of each sampling point x , and calculate the average partition speed N of each working partition x .

[0074] Partition time T of the 6 work partitions of the first work cycle x9.9ms, 10.1ms, 10.0ms, 10.1ms, 10.2ms, 10.2ms in turn, according to the formula (1) to calculate the average partition speed N of the diesel engine in the 6 working partitions of the first working cycle x 1010.1rpm, 990.1rpm,...

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Abstract

The invention discloses a method for evaluating torque fluctuation of a diesel engine at a constant rotating speed. The method comprises the following steps that a working cycle of the diesel engine is equally divided into a plurality of working subareas with the same cylinder number as the diesel engine; a rotating speed signal of each working subarea is collected; an average subarea rotating speed of each working subarea is calculated and filtering weighting is carried out; the average rotating speed of each working cycle is calculated; then the absolute value of the rotating speed fluctuation ratio of each working subarea is calculated; and the absolute values of the rotating speed fluctuation ratios of all the working subareas in each working cycle are summed. According to the method for evaluating the torque fluctuation of the diesel engine at the constant rotating speed, the torque fluctuation is indirectly evaluated through the rotating speed fluctuation ratio in each working cycle, vibration caused by the torque fluctuation of the diesel engine is recorded and diagnosed in real time according to the rotating speed fluctuation ratio in each working cycle, and a dynamic correction basis is provided for vibration state judgment, reason investigation and torque control of the diesel engine, so that the service life of the diesel engine is prolonged and the customer driving experience is improved.

Description

technical field [0001] The invention relates to a test method of an engine, in particular to a torque fluctuation evaluation method of a diesel engine at a constant rotational speed. Background technique [0002] The engine is the main component of the vehicle power system, and the performance of the engine will directly affect the driving comfort and vehicle performance of the vehicle. At present, in the development and design stage of the engine, the torque value of the engine can be accurately measured by special measuring tools, and when testing and evaluating the diesel engine in the actual vehicle or power supporting equipment, it is necessary to unload the diesel engine and then Using professional measuring tools to measure is time-consuming and labor-intensive. The output torque of the diesel engine in the actual vehicle or power supporting equipment obtained by the existing monitoring software is obtained by the ECU software through fuel consumption estimation, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D45/00
CPCF02D45/00F02D2200/1002Y02T10/40
Inventor 郑功勋李振华孙显航严兵朱林峰夏进进纪丽伟凌建群
Owner 上海新动力汽车科技股份有限公司
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