Engine preignition endurance test method and device

Abstract

The invention discloses an engine preignition endurance test method and device, and belongs to the technical field of engine test.The engine preignition endurance test method comprises the steps of: determining that a test prototype meets a preignition endurance test requirement; and then controlling the test prototype to complete m times of sub-circulation, wherein each sub-cycle comprises a stepof cleaning the deposited carbon once, a step of generating the deposited carbon once and two test working conditions, performance parameters of the test prototype are tested and judged, and when a difference value between the performance parameters of the test prototype after the test and the performance parameters of the test prototype before the test is within a preset difference value range,the deformation of a preset part in the test prototype is determined to be within a preset deformation range, and the test prototype is determined to pass the preignition endurance test assessment. The engine preignition endurance test method and the device realize the preignition endurance test of the engine, have high reliability, play an important role in perfecting the engine development process and enhancing the engine examination, and can provide powerful support for research personnel to find out major design defects of an engine in advance.

Description

technical field [0001] The invention relates to the technical field of engine testing, in particular to an engine pre-ignition durability test method and device. Background technique [0002] At present, in order to meet the emission regulations and fuel consumption limit requirements of passenger cars, supercharged direct injection small-displacement engine technology is usually used in vehicles. However, as the power per liter and torque per liter of a small-displacement direct-injection supercharged gasoline engine increase, the engine is very prone to pre-ignition problems in the low-speed and high-load region. [0003] Among them, pre-ignition is an abnormal combustion phenomenon in which the oil-air mixture begins to ignite and burn before the spark plug ignites. Direct-injection supercharged gasoline engines are prone to pre-ignition in the low-speed and heavy-load region. Because the piston is in the upward compression stroke, it will cause very high cylinder pressu...

AI Technical Summary

Problems solved by technology

Direct-injection supercharged gasoline engines are prone to pre-ignition in the low-speed and heavy-load region. Because the piston is in the upward compression stroke, it will cause very high cylinder pressure and strong knocking, and even super knocking, making the cylinder The maximum explosion pressure in the engine may exceed 20 MPa, which can cause irreversible damage to the components in the engine cylinder, and can easily cause spark plug electrode fusing, piston top breakdown, connecting rod bending and other serious damage to the engine.

[0004] However, the relevant tests in the current engine development stage do not evaluate the engine's ability to withstand pre-ignition, lack of relevant test methods, and cannot test whether the design strength of the core components of the direct injection supercharged gasoline engine can meet the resistance Ability to prematurely burn problems

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