Piezoelectric valve actuator for flexible diesel operation

MacLachlan, Brian J.; Elvin, Niell; Blaurock, Carl; Keegan, Neil

doi:10.1117/12.545625

Cited by 13 publications

(6 citation statements)

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“…Some modern diesel fuel injection systems use piezoelectric stacks to actuate the injector control valve. [8][9][10] MacLachlan et al 11 developed an injector driven by a stroke amplified piezoelectric stack actuator. The assembly produced a stroke of 480 mm and a driving force of 26 N at an applied voltage of 250 V. Dynamic test results of the system show the 23 dB bandwidth of the valve to be just over 1 kHz with the first natural frequency of the system at 625 Hz.…”

Section: A Review Of Piezoelectric Valve Researchmentioning

confidence: 99%

A novel piezohydraulic aerospace servovalve. Part 1: design and modelling

Sangiah

Plummer

Bowen

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part I:

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Servovalves are compact, accurate and high-bandwidth modulating valves widely used in aerospace, defence, industrial and marine applications. However, manufacturing costs are high due to high part count and tight tolerances required, particularly in the first stage of the valve, and due to manual adjustments required as part of the set-up process. In this research, a novel servovalve concept is investigated that has the potential to be more cost-effective. In particular, for the first time, a piezoelectric first-stage actuator is developed to move a servovalve spool using the deflector jet principle; this is especially suited to aerospace actuation requirements. In the new valve, the conventional electromagnetic torque motor is replaced by a multilayer bimorph piezoelectric actuator. The bimorph deflects a jet of fluid to create a pressure differential across the valve spool; hence the spool moves. A feedback wire is used to facilitate proportional spool position control via mechanical feedback. The bimorph is directly coupled to the feedback wire and is immersed in hydraulic fluid. A high-order non-linear model of the valve has been developed and used to predict valve static and dynamic characteristics and is described in this article. This makes use of stiffness constants derived analytically for the bimorph-feedback wire assembly and cross-referenced to finite element analysis predictions. The model of the flow force acting on the deflector is an approximation of the force characteristic found from computation fluid dynamic analysis. The measured characteristics of the prototype valve are in good agreement with the simulation results and prove that the operational concept is viable.

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Section: A Review Of Piezoelectric Valve Researchmentioning

confidence: 99%

A novel piezohydraulic aerospace servovalve. Part 1: design and modelling

Sangiah

Plummer

Bowen

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…Depressurizing the chamber causes the valve plunger (15) to be pushed by the high pressure fuel within the chamber volume (9) at the pressure shoulder of nozzle needle (8). This high pressure fuel force overcomes the downward force provided by the nozzle spring (7). Once the nozzle needle ( 16) is lifted, high pressure fuel is sprayed from the injection orifice (10) into the combustion chamber.…”

Section: Figure 1 Solenoid Injector In Operation [2]mentioning

confidence: 99%

The Development Of A Piezoelectric Fuel Injector For Diesel Engine

Chiu¹

2021

Preprint

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Stringent emission levels challenge automotive industries to come up with innovative ways of improving existing technologies. In advancing diesel engine technology, the key factor lies in further developing a piezoelectric fuel injector in the common-rail system. A direct acting piezoelectric fuel injector prototype for the common-rail system was developed to preserve the lifetime of the actuator, achieve an adequate needle lift, and response quickly. Through analytical work and ANSYS simulations, problems were encountered on the initial designs. These problems were overcome with successive design improvements. Simulations and analytical estimations provide evidence on the potential performance on these improvements. After design iterations, a prototype was fabricated according to the final design. Experimental work further validated that the fuel injector designed is capable of meeting the requirements. Problems with the test results are discussed for further improvements on the design.

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“…Actuators are an essential part of these devices and an important aspect in improving their performance. Examples include diesel injection systems in automobiles or accurate alignment of mirrors in optical applications [1][2]. Piezoelectric materials exhibit an exceptionally compact structure, extreme resolution and low response time, among other required properties.…”

Section: Introductionmentioning

confidence: 99%

Novel genetically optimised high-displacement piezoelectric actuator with efficient use of active material

Poikselkä

Leinonen

Palosaari

et al. 2017

Smart Mater. Struct.

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This paper introduces a new type of piezoelectric actuator, Mikbal. The Mikbal was developed from a Cymbal by adding steel structures around the steel cap to increase displacement and reduce the amount of piezoelectric material used. Here the parameters of the steel cap of Mikbal and Cymbal actuators were optimised by using genetic algorithms in combination with Comsol Multiphysics FEM modelling software. The blocking force of the actuator was maximised for different values of displacement by optimising the height and the top diameter of the end cap profile so that their effect on displacement, blocking force and stresses could be analysed. The optimisation process was done for five Mikbal-and two Cymbal-type actuators with different diameters varying between 15-40 mm. A Mikbal with a ∅ 25 mm piezoceramic disc and a ∅ 40 mm steel end cap was produced and the performances of unclamped measured and modelled cases were found to correspond within 2.8 % accuracy. With a piezoelectric disc of ∅ 25 mm, the Mikbal created 72 % greater displacement while blocking force was decreased 57 % compared with a Cymbal with the same size disc. Even with a ∅ 20 mm piezoelectric disc, the Mikbal was able generate ~10 % higher displacement than a ∅ 25 mm Cymbal. Thus, the introduced Mikbal structure presents a way to extend the displacement capabilities of a conventional Cymbal actuator for low-to-moderate force applications.

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Piezoelectric valve actuator for flexible diesel operation

Cited by 13 publications

References 0 publications

A novel piezohydraulic aerospace servovalve. Part 1: design and modelling

A novel piezohydraulic aerospace servovalve. Part 1: design and modelling

The Development Of A Piezoelectric Fuel Injector For Diesel Engine

Novel genetically optimised high-displacement piezoelectric actuator with efficient use of active material

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