CN-122014451-A - Control method, device and system for low oil consumption of diesel engine

CN122014451ACN 122014451 ACN122014451 ACN 122014451ACN-122014451-A

Abstract

The invention discloses a control method, a device and a system for low oil consumption of a diesel engine, which comprise the following steps of obtaining the current engine speed and oil injection quantity of the diesel engine, respectively searching a lookup table MAP according to the engine speed and the oil injection quantity to determine a main injection advance angle, an EGR valve opening and an air demand quantity, storing the main injection advance angle, the EGR valve opening and the air demand quantity corresponding to different engine speeds and oil injection quantities in the lookup table, and generating an engine control instruction according to the main injection advance angle, the EGR valve opening and the air demand quantity. The pumping loss work of the engine is reduced by acquiring the current engine speed and fuel injection quantity of the diesel engine and opening the EGR valve, and the maximum main injection advance angle of the diesel engine under the working condition is obtained by opening the EGR valve, so that the fuel consumption level of the diesel engine under the working condition is effectively improved.

Inventors

YANG SHISHOU
WANG YINGXIAO
DU YUBIN
WANG JING
YUAN HAIYING
ZHANG JIAXU
LI ZHIKUN
Zi Shuaijie
YUAN WEI

Assignees

昆明云内动力股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (5)

1. The low oil consumption control method of the diesel engine is characterized by comprising the following steps of: Acquiring the current engine speed and fuel injection quantity of a diesel engine; searching a lookup table MAP according to the engine speed and the fuel injection quantity to determine a main injection advance angle, an EGR valve opening and an air demand quantity, wherein the main injection advance angle, the EGR valve opening and the air demand quantity corresponding to different engine speeds and fuel injection quantities are stored in the lookup table, the main injection advance angle, the EGR valve opening and the air demand quantity are tested under the engine speeds and the fuel injection quantities, and the main injection advance angle, the EGR valve opening and the air demand quantity corresponding to the situation that the in-cylinder explosion pressure is smaller than or equal to the maximum explosion pressure allowed by design and the specific fuel consumption is not reduced any more; And generating a control instruction of the engine according to the main injection advance angle, the EGR valve opening and the air demand.
2. The method for controlling low fuel consumption of a diesel engine according to claim 1, wherein the step of obtaining the current engine speed and fuel injection amount of the diesel engine comprises the steps of: acquiring the current engine speed of the diesel engine acquired by an engine speed sensor and throttle position data acquired by a throttle position sensor; and calculating to obtain the oil injection quantity according to the throttle position data.
3. The diesel engine low oil consumption control device comprises a memory and a controller which are sequentially in communication connection, wherein a computer program is stored in the memory, and the controller is used for reading the computer program and executing the diesel engine low oil consumption control method according to any one of claims 1 to 2.
4. A diesel engine low oil consumption control system is characterized by comprising the diesel engine low oil consumption control device, a data acquisition unit and an engine, wherein the data acquisition unit and the engine are connected to the diesel engine low oil consumption control device through signals; the data acquisition unit comprises an engine rotating speed acquisition unit and an oil injection quantity acquisition unit.
5. The system for controlling low fuel consumption of a diesel engine according to claim 4, wherein the fuel injection amount acquisition unit is an accelerator position sensor.

Description

Control method, device and system for low oil consumption of diesel engine Technical Field The invention belongs to the technical field of diesel engine control, and particularly relates to a method, a device and a system for controlling low oil consumption of a diesel engine. Background The diesel engine is still used as a main power source of commercial trucks at present and is widely applied to various commercial trucks due to the characteristics of large power output, good fuel economy and the like. Moreover, the diesel engine has outstanding performance in heavy-load transportation and can give consideration to dynamic performance and economy, so that the diesel engine becomes a preferred power device for long-distance transportation and heavy-load freight transportation. In order to meet the limit requirements of national six-emission regulations, the current diesel engine mainly adopts cold-end exhaust gas recirculation (Exhaust Gas Recirculation, EGR) to control the emission of nitrogen oxides in the engine. With the increase of market competition, each main engine plant continuously strengthens the rated power of the engine through a supercharging and intercooling technology, but in order to control the cost of the engine, an exhaust gas turbocharger is still adopted. In order to increase the air inflow, the supercharging pressure ratio can only be increased continuously, and finally, the high supercharging technology and even the ultra-high supercharging technology are adopted. However, the high pressure ratio or the ultra-high pressure ratio increases the system air inlet pressure, and increases the air inflow to further increase the engine power, but at the same time, the power loss of pumping gas is greatly increased under the partial load working condition of the high-speed region in the engine, so that the situation of fuel consumption deterioration is caused. In addition, the reasonable main injection advance angle enables the engine to burn more fully, the specific fuel consumption of the engine is the lowest, but the excessive supercharging ratio can lead to the maximum explosion pressure in the engine cylinder to exceed the limit pressure allowed by the engine design, so that the fuel consumption of the engine cannot reach the best. Disclosure of Invention In order to solve the problem of fuel consumption deterioration caused by the adoption of a high pressure ratio or an ultrahigh pressure ratio in the existing method, the invention provides a control method, a device and a system for low fuel consumption of a diesel engine, and the fuel consumption level is effectively improved. The aim of the invention is achieved by the following technical scheme: The invention discloses a control method for low oil consumption of a diesel engine, which comprises the following steps: Acquiring the current engine speed and fuel injection quantity of a diesel engine; searching a lookup table MAP according to the engine speed and the fuel injection quantity to determine a main injection advance angle, an EGR valve opening and an air demand quantity, wherein the main injection advance angle, the EGR valve opening and the air demand quantity corresponding to different engine speeds and fuel injection quantities are stored in the lookup table, the main injection advance angle, the EGR valve opening and the air demand quantity are tested under the engine speeds and the fuel injection quantities, and the main injection advance angle, the EGR valve opening and the air demand quantity corresponding to the situation that the in-cylinder explosion pressure is smaller than or equal to the maximum explosion pressure allowed by design and the specific fuel consumption is not reduced any more; And generating a control instruction of the engine according to the main injection advance angle, the EGR valve opening and the air demand. The second aspect of the present invention provides a diesel engine low fuel consumption control device, which comprises a memory and a controller that are sequentially in communication connection, wherein the memory stores a computer program, and the controller is used for reading the computer program and executing the diesel engine low fuel consumption control method described in the first aspect and any one of the possible aspects thereof. The third aspect of the invention provides a diesel engine low oil consumption control system, which comprises the diesel engine low oil consumption control device described in the second aspect, a data acquisition unit and an engine, wherein the data acquisition unit and the engine are connected to the diesel engine low oil consumption control device through signals; the data acquisition unit comprises an engine rotating speed acquisition unit and an oil injection quantity acquisition unit. Compared with the prior art, the invention has at least the following advantages and beneficial effects: According to the invention, the pumping loss work of the e