Design and Application of ECU Controlled Constant Pressure Exhaust Brake on 5.7 l Engine for ICV Application

Srivastava, Vivek; Shankar, Patil; Mahesh, P.

doi:10.4271/2013-26-0125

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Engine brake includes exhaust brake, compression-release brake, and bleeder brake. [19][20][21][22] The exhaust brake is the lowest cost engine brake, but the braking power is low when used alone. The compression-release brake and the bleeder brake need to modify the valve train on a traditional four-stroke engine, and the peak braking power of both is greater than that of exhaust brake.…”

Section: Introductionmentioning

confidence: 99%

Development of a variable mode valve actuation system for a heavy-duty engine

Wang

Long

Cui

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new variable mode valve actuation system for a heavy-duty engine was proposed and designed in this paper. The variable mode valve actuation system can significantly enhance braking safety and improve fuel economy and emission of heavy-duty engines through flexible switching among four-stroke driving mode, two-stroke compression-release braking mode, and cylinder deactivation mode on a conventional four-stroke engine. The switching was controlled by four-stroke driving modules and two-stroke braking modules, both of which have two operation states: effective state and failure state. For the control of the multi-cylinder engine, all cylinders can be divided into several groups, and all the four-stroke driving modules in the same group were controlled by one solenoid valve, as well as all the two-stroke braking modules were controlled by another solenoid valve. A hydraulic-mechanical multi-body dynamics model was established to investigate the switching response of the variable mode valve actuation system. The results indicated that when the engine operated at 2000 r/min, the switching of the four-stroke driving module and the two-stroke braking module required 30 °CA and 101 °CA at most, respectively. In addition, to avoid the conflict between the four-stroke driving valve lift and the two-stroke braking valve lift, the switching between the four-stroke driving mode and the two-stroke compression-release braking mode must have a reasonable sequence. The variable mode valve actuation system has an excellent switching response and it is convenient for the control of the multi-cylinder engine. Therefore, the variable mode valve actuation system has a good application prospect for heavy-duty engines.

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Section: Introductionmentioning

confidence: 99%

Development of a variable mode valve actuation system for a heavy-duty engine

Wang

Long

Cui

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Engine brake includes exhaust brake, compression release brake, and bleeder brake. 24–27 A typical engine brake device is exhaust brake, typically comprising a butterfly valve in the exhaust system which momentarily prevents exhaust gases escaping, thereby retarding the engine. Exhaust brake is the lowest cost engine brake, but braking power is relatively low when used alone and the exhaust butterfly valve is easy to corrode and damage.…”

Section: Introductionmentioning

confidence: 99%

Research on two-stroke compression release braking performance of a variable mode valve actuation system

Wang

Long

Cui

et al. 2019

International Journal of Engine Research

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In order to enhance the braking safety and improve the fuel economy and emission of heavy-duty engines, a variable mode valve actuation system which can switch operation modes flexibly among four-stroke driving, two-stroke compression release braking, and cylinder deactivation modes on a four-stroke engine was developed in this article. The switching was controlled by the four-stroke driving module and the two-stroke braking module, both of which have two states: effective state and failure state. Besides, a full-cycle numerical model of a six-cylinder turbocharged engine was established for the performance analysis of two-stroke compression release braking mode. The orthogonal design method was introduced in the present study to obtain the optimum valve parameters which can result in high braking power and maintain the maximum cylinder pressure at a lower level at the same time. Then, the two-stroke compression release brake braking power with the optimum valve parameters was compared with four-stroke compression release braking power. Meanwhile, the two-stroke braking cam profile of the variable mode valve actuation system was designed according to the optimum valve parameters, and the two-stroke braking performance with the dynamic valve lift of the variable mode valve actuation system was validated by the numerical model including the hydraulic system. The results indicated that a higher engine speed leads to higher braking power at the same valve lift. Besides, two-stroke compression release brake braking power of the variable mode valve actuation system achieved 525.3 kW at 2600 r/min and 358.1 kW at 1900 r/min, 52.9% and 71.3% higher than four-stroke compression release braking power, respectively. Although the two-stroke compression release brake braking power with dynamic valve lift is slightly less than that with the optimum valve parameters, it is still much higher than that of the four-stroke compression release braking power. Therefore, it has a good application prospect for heavy-duty engines.

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