Diesel engine lubricating oil supply system and supply control method

Abstract

The invention provides a diesel engine lubricating oil supply system and a supply control method. The supply control method comprises the steps that when a diesel engine is standby, an auxiliary pump is started, and a main pump is kept closed; after the diesel engine is started, the main pump is started, when an electric controller judges that the inlet pressure of lubricating oil is larger than an oil pressure threshold value and the rotating speed of the diesel engine is larger than the rotating speed threshold value, the electric controller closes the auxiliary pump, and the main pump supplies oil to the diesel engine in the high working condition independently; and after the diesel engine is started and the auxiliary pump is closed, when it is judged that the rotating speed of the diesel engine is smaller than or equal to the rotating speed threshold value or the inlet pressure is smaller than or equal to the safety threshold value, the auxiliary pump is restarted. Independent oil supply of the main pump and the auxiliary pump and cooperative oil supply of the main pump and the auxiliary pump are achieved through independent opening and closing of the main pump and the auxiliary pump, on the premise that an existing lubricating oil pump structure is not changed, the low-energy-consumption design of the diesel engine under the high working condition and intelligent pressure supplementing under the low working condition can be achieved, lubricating oil inlet pressure is increased through common oil supply of the main pump and the auxiliary pump under the low working condition, and therefore the reliability of the diesel engine is improved.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, and in particular relates to a diesel engine lubricating oil supply system and a supply control method. Background technique [0002] The lubricating oil system is one of the main guarantee systems for the operation of the diesel engine, which is responsible for the lubrication and cooling of the main friction pairs of the diesel engine. Among them, the lubricating oil pump, as the core component of the lubricating oil system, provides power for the system, determines the oil supply flow of the system, and directly affects the power consumption and operation reliability of the system. Lubricating oil pumps for marine diesel engines usually use external gear pumps, which are driven by the crankshaft through transmission gears. Since the displacement of the gear pump is directly proportional to the speed, in order to meet the oil supply requirements of different working conditions, the syst...

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Problems solved by technology

[0003] First, when the diesel engine rotates at a high speed, it is in a high working condition. At this time, in order to ensure the oil supply demand of the partial load working condition, the oil supply characteristic of the lubricating oil pump is a gear pump, so that the flow rate and pressure of the lubricating oil pump will rise rapidly under high working conditions. High, so the oil supply redundancy of the system is too large, and the excess flow needs to be bypassed by the pressure regulating valve, which makes the overall volume of the lubricating oil pump bloated, high power consumption of the system, and low energy efficiency

[0004] Second, when the diesel engine speed is low, it is in a low working condition. At this time, as the low working condition diesel engine speed decreases, the oil supply characteristic of the lubricating oil pump is a gear pump, so that the flow and pressure of the lubricating oil pump decrease rapidly, resulting in oil supply Insufficient, which will affect the lubrication and cooling of the friction pair under low operating conditions, and may trigger a low system pressure alarm to stop

[0005] In order to solve the above problems, the structure of the lubricating oil pump itself is often redesigned in the prior art, which makes the internal structure complex and larger than before the transformation, which is not conducive to the compact design of the diesel engine

In addition, after the redesign, the variable adjustment of the flow rate must be realized by means of the dynamic adjustment of the eccentricity of the lubricating oil pump or the meshing tooth width. The system flow adjustment response is slow, the pressure fluctuation is large, and the reliability is low.

In addition, the existing technology mainly relies on the system oil pressure to change the internal structure of the lubricating oil pump, such as eccentricity, meshing tooth width, etc., so as to realize the adjustment of lubricating oil supply. The adjustment strategy is single, and it is impossible to realize flexible multi-level adjustment and intelligent system , the matching degree is not high

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