Control method and equipment for engine test injection
A control method and engine technology, which is applied in the field of vehicles, can solve problems such as liquid accumulation in the cylinder and engine damage, and achieve the effect of avoiding test spraying and liquid accumulation in the cylinder
Active Publication Date: 2021-06-22
WEICHAI POWER CO LTD
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Problems solved by technology
[0005] The embodiment of the present application provides a control method and equipment for engine test spraying to solve the problem of fluid accumulation in the cylinder and engine damage caused by the back-drag failure of the dynamometer during the bench test
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[0054] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.
[0055] When the signal of the camshaft or crankshaft of the engine is abnormal, the ECU of the engine cannot correctly judge the cylinder, that is, the crankshaft reaches the top dead center, but cannot judge which cylinder is at the top dead center. At this time, the engine will enter the test injection mode. The test injection mode means that...
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The embodiment of the present application provides a control method and equipment for engine test spraying, the method includes: if the target engine needs test spraying, then judging whether the speed of the target engine reaches the first preset within the first preset time period speed; if the speed of the target engine reaches the first preset speed within the first preset time period, it is judged whether the speed of the target engine is raised to the second preset speed within the second preset time period Set the speed; if the speed of the target engine increases to the second preset speed within the second preset time period, it is determined that the speed of the target engine is increased from the first preset speed to the The first rotational speed change rate of the second preset rotational speed; according to the first rotational speed change rate, it is judged whether the dynamometer of the target engine has a back-drag working condition; if the back-drag working condition occurs on the dynamometer , then control the target engine to stop the test spraying, avoiding the accumulation of liquid in the cylinder and damage to the engine.
Description
technical field [0001] The embodiments of the present application relate to the technical field of vehicles, and in particular, to a control method and device for test injection of an engine. Background technique [0002] With the continuous development of economy, vehicles have become an important means of transportation for people to travel. As the energy conversion device of the vehicle, the engine provides power for the vehicle. When the signal of the camshaft or crankshaft of the engine is abnormal, the Electronic Control Unit (ECU) of the engine cannot correctly judge the cylinder, that is, the crankshaft reaches the top dead center, but cannot judge which cylinder is at the top dead center. The engine will go into test injection mode. The test injection mode means that by injecting fuel into a certain cylinder, it is judged whether the engine speed increases. If the speed increases, it is judged that the engine injects fuel to the correct cylinder; if the speed does...
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IPC IPC(8): G01M15/02G01M15/04
CPCG01M15/02G01M15/04
Inventor 辛英秦涛孙明峰曹石武迎迎
Owner WEICHAI POWER CO LTD