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Control method for avoiding gasoline engine running in knocking area

A knock area and control method technology, applied in engine control, electrical control, fuel injection control, etc., can solve problems such as inability to completely eliminate knock, delay ignition angle and sacrifice efficiency, so as to improve NVH performance, increase service life, Reduce the effect of knocking

Active Publication Date: 2022-04-12
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, excessive fuel injection is used to lower the temperature of the combustion chamber, high-grade oil is used, or efficiency is sacrificed by delaying the ignition angle, etc. to reduce the occurrence of knocking and super knocking, and knocking cannot be completely eliminated.

Method used

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  • Control method for avoiding gasoline engine running in knocking area
  • Control method for avoiding gasoline engine running in knocking area
  • Control method for avoiding gasoline engine running in knocking area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Control algorithm for avoiding gasoline engine running in the knocking area:

[0036] By increasing the engine speed on the equal power line of the engine, changing the operating point of the engine, and then sending the increased engine target speed (generally higher than the current speed) to the TCU, the TCU corrects the shift according to the target speed sent by the EMS The curve, by delaying the upshift, reducing the speed ratio, etc., makes the engine quickly cross the knocking danger zone of low speed and high load, so as to avoid engine knocking. After using the knock area identification and avoidance strategy, when the ambient temperature is high and the vehicle is running at a low engine speed and high load condition, the strategy will be automatically activated, and the EMS will request the TCU to adjust the speed ratio so that the engine is at a relatively high speed. Operate under high speed conditions to avoid knocking areas. This technology provides a s...

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Abstract

The invention relates to a control method for preventing a gasoline engine from running in a knocking area. Belongs to the technical field of automobile software development and application. The method comprises the following steps that 1, a knocking area is recognized, and whether an engine has a knocking phenomenon or not is judged according to a cylinder pressure detection mode; 2, the power requirement of the vehicle is met; and step 3, avoiding operation of the knock area: increasing the rotating speed of the engine on an equipower line of the engine, changing the operating condition point of the engine and increasing the target rotating speed of the engine, so that the engine quickly passes through the low-rotating-speed and high-load knock dangerous area. According to the method, the upshift or deceleration ratio is delayed by correcting the gear shifting curve, a low-speed and high-load knock area is quickly crossed, and engine knock is avoided.

Description

technical field [0001] The invention relates to a control method for avoiding a gasoline engine running in a knocking area. The invention belongs to the technical field of automobile software development and application. Background technique [0002] Knocking occurs during the test: The vehicle is undergoing a TASE test, the ambient temperature is 38°C, and the engine will experience severe knocking under full load conditions at a slope of 30km@12%. [0003] During the test drive, it was found that at a speed of 1300-1800RPM, about ≥ 80NM, there is a probability that a relatively obvious continuous knocking sound will be produced; this kind of working condition is actually used on the road at a constant speed of more than 70 kilometers, and ordinary acceleration is generally not It will be used, but the influence of 70 kilometers at a constant speed is more obvious. [0004] The rattling sound when the vehicle starts: the rattling sound is heard when the vehicle starts, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08F02D41/10F02D45/00
CPCY02T10/40
Inventor 黄晓波龚贺师潘俭栓廖善彬骆旭薇张海滨郭华锋宁成钢
Owner JIANGLING MOTORS