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Engine compression ratio adjustment and control method and adjustment and control device

A control device and engine technology, applied in metal processing, metal processing equipment, manufacturing tools, etc., can solve the problems of poor engine power and economy, poor engine performance consistency, engine knocking, etc., to achieve performance consistency guarantee, reduce Volume tolerance, effect of improving accuracy

Inactive Publication Date: 2018-12-18
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional compression ratio design, the tolerance of the compression ratio is large, the tolerance is greater than ±1, and the fluctuation range is large. The power and economy of the engine at the upper limit of the compression ratio are poor, and the rated power is quite different from the design value. The fuel consumption is high and the compression ratio is high. The engine with a ratio of the upper limit will have a slight knocking phenomenon, and the engine performance consistency is poor

Method used

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  • Engine compression ratio adjustment and control method and adjustment and control device

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Embodiment 1

[0033] In the embodiment of the present invention, the volume of the combustion chamber in the cylinder is composed of different parts. Since each part has a tolerance, there will be a tolerance when calculating the volume, which in turn will cause a tolerance to the compression ratio. Since the volume of each part is affected by a different number of parts, the more the number of parts, the greater the cumulative tolerance, and the compression volume of each part is different, and the impact ratio on the compression ratio is also different. To reduce the compression ratio tolerance, first conduct a comparative analysis of the volume tolerance of each part to the compression volume ratio, and then make targeted improvements.

[0034] ΔV i =V iMax -V iMin

[0035] Among them, f i —Proportion of the minimum working volume of the cylinder, ΔV i —Volume tolerance, V c The minimum working volume of the cylinder.

[0036] By theoretical calculation, f 1 = 1.3%, f 2 =7.7%,...

Embodiment 2

[0055] In yet another embodiment of the present invention, after the piston protrusions are grouped, each engine needs to be measured in detail during installation. Manually measuring the piston protrusions not only has low production efficiency, affects the production rhythm, but also has large errors. And the cylinder pads 7 of different groups are similar in shape, and the workers are also easy to take the wrong ones when selecting the cylinder pads 7 . Therefore, although this method can reduce the compression ratio tolerance theoretically, it is difficult to realize in practice. Combining the principle of Scheme 1, an automatic equipment is designed, which integrates testing and assembly, avoids errors in manual assembly and improves production efficiency.

[0056] Such as figure 1 As shown, the embodiment of the present invention also provides an engine compression ratio regulating device, and the engine compression ratio regulating device includes:

[0057] Protrusion...

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Abstract

The invention discloses an engine compression ratio adjustment and control method and adjustment and control device. By measuring the protrusion of each piston in a cylinder body of an engine respectively, the protrusion amount of each piston is compared with the preset standard, a cylinder pad of the corresponding thickness is determined, and the cylinder pad is arranged between the cylinder bodyof the engine and a cylinder cover, so that the piston protrusion and the cylinder pad can be grouped, the volume tolerance of a combustion chamber of a cylinder pad hole is reduced, the compressionratio tolerance is reduced, and the accuracy of the compression ratio is improved, so that the performance consistency of the engine is guaranteed; and in addition, the engine compression ratio adjustment and control device adopts automated assembly processes, the errors caused by the human factors are avoided, the accuracy is improved, meanwhile, the test process of the piston protrusion can playa real-time monitoring role in the process, and the situation that the piston protrusion is not in the normal range is avoided.

Description

technical field [0001] The invention relates to the field of vehicle engines, in particular to an engine compression ratio regulation method and regulation device. Background technique [0002] The compression ratio of the engine is a crucial parameter that has a great influence on the engine power and torque. The actual compression ratio lower than the design value will lead to incomplete combustion of the mixture, the reduction of torque and power, and the increase of fuel consumption, while the compression ratio higher than the design value is prone to knocking, which seriously affects the working state of the engine. Therefore, the accuracy of the compression ratio is relatively high. high. [0003] The original engine is an inline four-cylinder turbocharged engine, the design value of the compression ratio is 17.4±1.2, and the calculation formula of the compression ratio ε is: [0004] V c =V 1 +V 2 +V 3 +V 4 [0005] Among them, V H —Cylinder working volume;...

Claims

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Application Information

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IPC IPC(8): B23P19/04
CPCB23P19/042
Inventor 丁光辉陆荣荣孙邦江赵文仲张雪林滕建耐许涛张波王书林刘路雷淋森
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD