Abstract
The paper presents the results of an analytical experimental research of conditions for excitation of oscillatory processes in steady-state conditions and in the process of starting-up an engine equipped with a modern Common Rail fuel supply control system. Based on the results of mathematical simulation, the dependence of the dynamic torque amplitude on boosting acceleration during engine start-up and on the parameters of the elastic-dissipative coupling (connection) of the engine with the transmission is analyzed. It establishes the rationale for a possibility of optimizing the fuel supply system control algorithms for a modern diesel engine, taking into consideration the dependence of the process on the properties of the transmission and the peculiarities of its operation.
Highlights
Dynamic loading of powertrain units (PTU) of transport vehicles at steady-state operating modes is determined by resonant oscillations excited by the harmonic components of the engine torque when disturbance frequencies coincide with Eigen frequencies of the mechanical system
The findings suggest that the main way to reduce mechanical system dynamic loading at start-up the engine with a modern fuel control system is a substantiated adjustment of the control system operation algorithm in the "start-up" mode, which ensures fast boosting acceleration when passing through a dangerous resonance zone
4.1 One of the possible ways to reduce mechanical system dynamic loading at starting-up the engine with a modern fuel control system is a substantiated adjustment of the control system algorithm in the "start-up" mode, which ensures fast boosting acceleration when passing through a dangerous resonance zone
Summary
Dynamic loading of powertrain units (PTU) of transport vehicles at steady-state operating modes is determined by resonant oscillations excited by the harmonic components of the engine torque when disturbance frequencies coincide with Eigen frequencies of the mechanical system. In power unit of many transport vehicles with hydromechanical transmission (HMT), with torque convertor (TC) cast wheels, the function of the elastic element torsional oscillation damper – is performed by a torsion shaft. The torsion shaft is installed between the engine flywheel and the torque converter pumping wheel This solution allows increasing the specific volumetric efficiency of the engine-transmission compartment in comparison with foreign designs. Taking resonance oscillations outside the limits of the engine operating range does not exclude their excitation at low frequencies - when the engine starts-up and stalls [11]. Grishkevich [5], et al were accepted These works were the foundation for development of a method for calculating stationary torsional oscillations excited by an internal combustion
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