Design of a solenoid valve based active engine mount

Abstract

This paper describes the design of a versatile and fully controllable active engine mount. The proposed active mount is capable of addressing vibration isolation requirements at various driving conditions. This design addresses a better ride quality that has always been demanded by the automotive industry, as well as satisfying sophisticated vibration isolation requirements for the unconventional engines, i.e. variable displacement, and hybrids. The proposed engine mount replaces the decoupler of the original design with a solenoid actuator. The mathematical model of the active mount is obtained. The dynamic characteristics of the mount are shown to be highly controllable over the operating frequency range of excitation in engines. The effectiveness of the developed active engine mount for various working conditions of engine is also evaluated. Several driving conditions are investigated and proper control strategies are utilized to demonstrate the mount's capability to fulfill the isolation requirements for each condition. The promising results, in addition to compactness, low cost, fail safety, and durability are the main advantages of the proposed active engine mount, which makes it viable for automotive applications.

Experimental and analytical study of secondary path variations in active engine mounts

“…Carbon black filled rubber components have an amplitude-and frequency-dependent transfer behavior [31]. However, in AEMs, the main rubber spring is often modeled with a linear spring element [5,6] or a damper in parallel to a spring element (Kelvin-Voigt Model) [7,8]. Such models offer good agreement for dynamic stiffness over frequency but the damping characteristics are only a rough estimation [32].…”

“…Next, a linear analytical AEM model with an appropriate description for elastomeric components is developed and experimentally verified in Section 3. In contrast to existing work on AEM models [5][6][7][8], in Section 4, the experimental validation of the engine mount's secondary path is extended to higher frequencies up to 400 Hz. In Section 5, the assumption of the secondary path's linearity, which is a requirement for the application of the FxLMS algorithm, and the impact of the two major influences, temperature as well as preload, are investigated.…”

“…Several concepts for AEMs have been proposed in the past [1][2][3][4][5][6][7][8][9][10][11][12][13]. They have all in common that a conventional passive hydraulic engine mount (HEM) is extended by an actuator, e.g., of electromagnetic or piezoelectric type, to generate active impulse response of P(z) (dimensionless) p i (t) pressure inside upper fluid chamber (N/m 2 ) P(z) primary path (dimensionless) P xx (s) passive dynamic AEM characteristics F x ðsÞ=X T ðsÞ (N/m) P yx (s) passive dynamic AEM characteristics F y ðsÞ=X T ðsÞ (N/m) r engine order (dimensionless) R moving coil resistance (Ω) s…”

Extended filtered-x-least-mean-squares algorithm for an active control engine mount based on acceleration error signal

“…The Kelvin-Voigt model 23 strongly overestimates both stiffness and damping for higher frequencies. The three-parameter Maxwell model 24 resulted in a high-frequency description of stiffness but also in an underestimation of high-frequency damping.…”

An electro-hydrostatic actuator for hybrid active-passive vibration isolation

“…Hybrid hydraulic engine mounts which include active assistance from solenoid actuators have been reviewed in Yu et al (2011). In each engine mount the fluid is the resonating element but the addition of the actuator gives the ability to tailor the vibration response to specific driving or load conditions (Mansour et al, 2011).…”