Die elektrohydraulische Ventilsteuerung

Denger, Dirk; Mischker, Karsten

doi:10.1007/bf03227236

Cited by 5 publications

(2 citation statements)

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“…According to [10], Fiat also signaled problems with the installation of the glow plug when developing the 1.3 L four-cylinder diesel engine with four valves per cylinder due to the very limited available space in the cylinder and head. Also, Denger and Mischker [23] indicated that when modifying the valve head to install electro-hydraulic valve drives, the installation position of the injector and the glow plug should also be considered. Therefore, BERU glow plugs have glow tube diameters below 3 mm [77].…”

Section: Tasks and Features Of Glow Plugsmentioning

confidence: 99%

Problems with glow plug – a review

Woźniak¹,

Ozuna²,

Siczek³

2021

Combustion Engines

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Despite the development of hybrid and electric vehicles, a many-million population of cars with combustion engines, and particularly CI engines occurs on the roads. Also, many stationary CI engines are still utilized. Despite their improved technologies and characteristics the modern CI engines negatively affect an environment due to cold starting problems. Below 0 °C, engine starts are problematic due to the decreased battery performance and the spray characteristics, the increased ignition delay time, and the engine oil viscosity. Therefore, various glow plugs are applied to facilitate this process. Types, features, and applications of glow plugs in various engines have been discussed in the paper. One case of failure of glow plug has been presented in the article, including the cause of it.

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Section: Tasks and Features Of Glow Plugsmentioning

confidence: 99%

Problems with glow plug – a review

Woźniak¹,

Ozuna²,

Siczek³

2021

Combustion Engines

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“…The idea of hydraulic valve drive for internal combustion engine is known for many years. Research of such kind of timing gear is conducted by many research and industrial centres [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of Properties of Hydraulic Drive for Valves of Internal Combustion Engines

Szydłowski

Smoczyński

2013

Journal of KONES. Powertrain and Transport

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This paper describes a research stand and results of experimental research of single-acting hydraulic drive for valves of internal combustion engines. The research stand of the hydraulic valve drive was consisted of: typical valve drive for high-speed internal combustion engine, commercial hydraulic actuator, commercial hydraulic accumulator and electrically controlled hydraulic distributor, which controlled the flow of oil supply to the hydraulic actuator. Rexroth commercial servovalve was used as hydraulic distributor for this valve drive. Components of hydraulic valve drive were mounted to specially designed research sleeve. On this sleeve complete drive, which consisted of a hydraulic cylinder and servovalve, was mounted. Drive control was performed in an open loop with a use of rectangular control signal. Displacement of the valve was measured by an optical displacement sensor. Tests were performed for constant lift of the valve, supply pressure set in the range of 6 to 10 MPa and at fixed temperature of the working medium and different initial deflections of valve spring. The behaviour of the drive was researched for bipolar and a rectangular control signals. Such range of measurements was to determine inter alia: the impact of the supply pressure and the control signals values on the drive work. Obtained results were used to verify the simulation model in a wide range of variation of the characteristic parameters of the electro-hydraulic actuator. The results of experimental measurements like valve movement and pressures in the drive were shown and analysed in this paper. With a reference to the valve movement, a detailed calculations of the valve kinematics were performed. Special attention was given to the opening and closing velocities of the valve, depending on the servo control signal. Subsidence valve velocity during its return movement was calculated. This subsidence valve velocity is an important parameter in terms of the applicability of this drive for the internal combustion engines. Valve opening time delay in opposition to the current control signal was also specified and discussed. Obtained results allowed to conclude that the proposed drive provides acceptable kinematic parameters for high-speed engines at supply pressures of at least 8 to 10 MPa. During the measurements acceptable valve subsidence speeds were obtained. It was found that there is a possibility of adjustment of this parameter by setting the slider servovalve negative overlap. Results became the basis of development of the model of this type of the drive. Further simulation studies will allow to evaluate the applicability of such valve drive for internal combustion engines. Further simulation studies allow to compare the proposed solution with known literature hydraulic valve drives.

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