Oil supply controlling system for diesel engine burning vegetable oil and its oil supply method

Abstract

The invention belongs to a fuel feed control system and a fuel feed method for a diesel engine using vegetable oil. The invention is mainly technically characterized in that: the fuel feeder of the diesel engine consists of a diesel fuel feeder, a vegetable oil feeder and a fuel dispenser connected with one end of each feeder entering the diesel engine. The fuel feed control system is provided with a controller for controlling the fuel dispenser. The fuel feed method for vegetable oil is that: when the diesel engine is started, the signal outputted by the controller controls the fuel dispenserto only activate the diesel fuel feeder; the operating mode parameters of the diesel engine and the temperature of the vegetable oil in a heater are sent to the controller by a sensor for comparisonwith set values in the controller; the controller gives a control signal to the fuel dispenser according to programmed control algorithm to enable mixture of the diesel fuel and the vegetable oil or fuel changeover; and during the stage of mixed fuel feeding, the controller realizes optimal control with an index of water temperature variation gradient in the diesel engine and an objective of the combustion quantity of the vegetable oil being larger than that of the diesel fuel.

Description

technical field [0001] The invention belongs to the field of diesel engines, in particular to an oil supply control system for a diesel engine burning vegetable oil and a vegetable oil oil supply method for the diesel engine system. Background technique [0002] Petroleum is a non-renewable resource. With the gradual reduction of petroleum reserves, exploring the substitutes of petroleum products has become a global research hotspot. At present, it is a relatively mature technology to convert animal and vegetable oils to biodiesel instead of petrochemical diesel by chemical or enzymatic methods, but the cost of such methods is too high, and there is no practical promotion significance under the current high oil price. Recently, foreign countries have tried to use vegetable oil (oil extracted from some plant fruits, roots, stems, and leaves) to replace diesel oil and have achieved initial success. Without any changes to the existing diesel engine structure, only the original ...

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Problems solved by technology

But this alternative technology also has some insurmountable shortcomings: 1. Since the viscosity of vegetable oil is greater than that of diesel oil, directly using vegetable oil at room temperature will inevitably cause blockage of the oil circuit, so it must be heated to reduce the viscosity of vegetable oil. The alternative technology itself cannot precisely control the heating temperature of vegetable oil, which makes it difficult to control the viscosity of vegetable oil, resulting in insufficient combustion of vegetable oil and serious carbon deposits in the cylinder, which intensifies mechanical wear, deteriorates the working condition of diesel engines, and increases the failure rate of equipment; The incomplete combustion of vegetable oil also aggravates the pollution of engine oil, which will cause serious pollution to the environment

2. Since vegetable oil and diesel oil are switched manually, operators mostly rely on experience and feeling to operate, and the oil supply switching connection is not accurate, which may easily cause diesel engine combustion failure, thereby affecting the normal operation of the diesel engine

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