Engine overspeed preventive control system

Abstract

The invention discloses an engine overspeed preventive control system, and relates to the technical field of heavy engineering equipment. The engine overspeed preventive control system comprises an overspeed preventive valve group, a closed plunger pump, an engine and a hydraulic motor. The overspeed preventive valve group comprises an oil port B2, an oil port B1, an oil port A2 and an oil port A1; the oil port B1 and the oil port B2 can be communicated with each other in the overspeed preventive valve group; the oil port A1 and the oil port A2 can be communicated with each other in the overspeed preventive valve group; an oil port B of the closed plunger pump can be communicated with the oil port B1, and an oil port A of the closed plunger pump can be communicated with the oil port A1; anoutput shaft of the engine is connected with the closed plunger pump; an output shaft of the hydraulic motor is connected with a speed reducer. The engine overspeed preventive control system has thetechnical advantages that the engine can be prevented from being damaged due to overspeed, the heat productivity of the engine overspeed preventive control system can be reduced, and the speeds can bemanually increased on the premises of long slope descending and non-overspeed engines.

Description

technical field [0001] The invention relates to the technical field of heavy engineering equipment, in particular to a control system for preventing engine overspeed. Background technique [0002] The closed hydraulic drive system is widely used in engineering equipment, and it has the characteristics of high pressure, high system integration, small hydraulic oil tank, and small volume of hydraulic components. The closed hydraulic drive system has less oil exchange with the fuel tank when the flow rate is large, reducing the contact with the air, so that the amount of air dissolved in the oil is less, and the service life of the oil is prolonged. The system has no control valve and is determined by the oil pump. The flow and flow direction realize the reversible drive. [0003] However, in the process of implementing the technical solutions in the embodiments of the present invention, the inventors of the present application found that the above-mentioned prior art has at l...

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Problems solved by technology

[0005] The embodiment of the present invention provides a control system for preventing engine overspeed, which is used to solve the problem in the prior art that when the vehicle is on a large slope and goes downhill for a long time, the hydraulic pump will drag the engine against the engine. The technical problem of engine overspeed damage has achieved the technical effect of preventing engine overspeed damage, reducing system calorific value, and manually increasing the speed on the premise of long downhill and the engine does not overspeed

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