Flywheel-free diesel engine generator/motor system control method

Abstract

The invention provides a flywheel-free diesel engine generator / motor system control method and belongs to the field of machines. According to the flywheel-free diesel engine generator / motor system control method, an energy storage function of a diesel engine flywheel is replaced with a generator / motor four-quadrant working mode, peak load shifting is performed on the output torque of a diesel engine, uniform fluctuation torque is achieved, and uniform output of the rotating speed of a crankshaft is represented. Meanwhile the rotational inertia of the crankshaft can be lowered greatly, the adjusting response of the rotating speed of the diesel engine is accelerated, and therefore the speed adjusting performance of the diesel engine is improved.

Description

technical field [0001] The invention belongs to the field of improving the speed regulation performance of a diesel engine in the mechanical industry, especially the occasion where the speed regulation response of the diesel engine is required to be high, and specifically relates to the field of engineering machinery in which a hydraulic pump is driven by a diesel engine to realize flow control of the pump. Background technique [0002] Diesel engines are widely used in the mechanical industry. The flywheel is a mechanical device with a large moment of inertia in the diesel engine components. It is used to store energy in the form of kinetic energy and can even out the fluctuating torque generated by the periodic unbalanced inertial force of the moving parts of the diesel engine. At the same time, it also increases the moment of inertia of the crankshaft, which makes the speed regulation response of the diesel engine slow. In the construction machinery driven by the diesel en...

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Problems solved by technology

[0002] Diesel engines are widely used in the mechanical industry. The flywheel is a mechanical device with a large moment of inertia in the diesel engine components. It is used to store energy in the form of kinetic energy and can even out the fluctuating torque generated by the periodic unbalanced inertial force of the moving parts of the diesel engine. At the same time, it also increases the moment of inertia of the crankshaft, which makes the speed regulation response of the diesel engine slow. In the construction machinery driven by the diesel engine, the load of the hydraulic pump is usually complicated, the external load changes frequently, and the range of change is large. Long-term high fuel consumption, high Due to the problem of emissions, the energy management of hybrid construction machinery is also very complicated due to its complex working conditions

[0003] Due to the inconvenient adjustment of the speed of the traditional diesel engine, when the ordinary hydraulic excavator is performing typical operations, the speed of the ordinary hydraulic excavator is generally set to 2000rmp, which not only makes the fuel utilization rate of the diesel engine low, but also causes a large throttling loss in the hydraulic system

At present, in view of the problems of large power consumption and poor emission of hydraulic excavators driven by traditional diesel engines, an electric drive hydraulic excavator with variable speed and variable displacement compound control strategy is proposed.

According to relevant studies, compared with ordinary hydraulic excavators, electro-hydraulic excavators can save more than 30% of operating costs, but in practical applications, electric drive excavators have problems of high battery cost and poor battery life.

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