阅读说明：本技术 低高压供油系统 (Low-high pressure oil supply system ) 是由 李冠霖 韦安阳 朱宏志 戈非 陈磊 董鑫 杨野 于 2019-10-30 设计创作，主要内容包括：本发明属于商用车柴油机供油系统技术领域,涉及一种低高压供油系统,包括高压油轨,高压油轨的进油口连接电控单体泵的高压出口,电控单体泵固定于发动机缸体内,电控单体泵连接滚轮体,滚轮体由油泵凸轮驱动实现升降,电控单体泵的低压回油口连接回油模块；电控单体泵的进油口连接供油装置的出油口；高压油轨上集成电控调压阀,电控调压阀连接回油模块,高压油轨的高压出口连接共轨喷油器。该系统能有效延长电控单体泵的生命周期,在发动机缸体结构不变的情况下将电控单体泵系统升级为共轨系统并且系统成本较低,同时能够在低温环境下使用冷滤点温度高的燃油气动并运行发动机。(The invention belongs to the technical field of oil supply systems of commercial vehicle diesel engines, and relates to a low-pressure and high-pressure oil supply system which comprises a high-pressure oil rail, wherein an oil inlet of the high-pressure oil rail is connected with a high-pressure outlet of an electric control monoblock pump, the electric control monoblock pump is fixed in an engine cylinder body and is connected with a roller body, the roller body is driven by an oil pump cam to realize lifting, and a low-pressure oil return port of the electric control monoblock pump is connected with an oil; an oil inlet of the electric control unit pump is connected with an oil outlet of the oil supply device; an electric control pressure regulating valve is integrated on the high-pressure oil rail, the electric control pressure regulating valve is connected with the oil return module, and a high-pressure outlet of the high-pressure oil rail is connected with the common rail oil injector. The system can effectively prolong the life cycle of the electric control monoblock pump, upgrade the electric control monoblock pump system into a common rail system under the condition that the structure of an engine cylinder body is not changed, is low in system cost, and can use fuel oil with high cold filter plugging point temperature to pneumatically operate the engine in a low-temperature environment.)

1. A low high pressure oil supply system which characterized in that: the device comprises a high-pressure oil rail (9), wherein an oil inlet of the high-pressure oil rail (9) is connected with a high-pressure outlet of an electric control monoblock pump (8), the electric control monoblock pump (8) is fixed in an engine cylinder body, the electric control monoblock pump (8) is connected with a roller body (7), the roller body (7) is driven by an oil pump cam (6) to lift, and a low-pressure oil return port of the electric control monoblock pump (8) is connected with an oil return module (12); an oil inlet of the electric control unit pump (8) is connected with an oil outlet of the oil supply device; an electric control pressure regulating valve (10) is integrated on a high-pressure oil rail (9), the electric control pressure regulating valve (10) is connected with an oil return module (12), a high-pressure outlet of the high-pressure oil rail (9) is connected with a common-rail oil sprayer (11), a low-pressure oil return port of the common-rail oil sprayer (11) is connected with the oil return module (12), an overflow valve (13) is arranged on the oil return module (12), the oil return port of the oil return module (12) is connected with a temperature regulation control valve (3) through a pipeline, an internal oil duct of the temperature regulation control valve (3) is connected with a fuel oil strainer (2), and an external oil pipe of the.

2. The low-high pressure oil supply system according to claim 1, wherein: the oil supply device comprises a fuel tank (1), an oil outlet of the fuel tank (1) is connected with a fuel coarse filter (2) through an oil pipe, an oil outlet of the fuel coarse filter (2) is connected with an oil inlet of an oil transfer pump (4) through an oil pipe, an oil outlet of the oil transfer pump (2) is connected with an oil inlet of a fuel fine filter (5) through an oil pipe, and an oil outlet of the fuel fine filter (5) is connected with an oil outlet of the oil supply device.

3. The low-high pressure oil supply system according to claim 1, wherein: the electric control unit pumps (8) are divided into two groups, the two groups of electric control unit pumps (8) are connected to a high-pressure oil rail (9) in parallel, low-pressure oil return channels (8.2) of the two groups of electric control unit pumps (8) are connected with an oil return module (12) in parallel, and low-pressure oil inlet channels (8.1) of the two groups of electric control unit pumps (8) are connected with an oil outlet of an oil supply device in parallel.

4. The low-high pressure oil supply system according to claim 1, wherein: the oil return module (12) comprises a module body, wherein an electric control monoblock pump oil return passage (12.1), an electric control pressure regulating valve oil return passage (12.2), a common rail oil sprayer oil return passage (12.3) and a total oil return passage (12.4) are arranged on the module body, a cavity is arranged at the lower port of the electric control pressure regulating valve oil return passage (12.2) and the common rail oil sprayer oil return passage (12.3), the total oil return passage (12.4) is arranged at the lower end of the cavity, and an overflow valve (13) is arranged at the lower part of the electric control monoblock pump oil return passage (12.1).

Technical Field

The invention belongs to the technical field of oil supply systems of diesel engines of commercial vehicles, and relates to a low-pressure and high-pressure oil supply system.

Background

In order to meet the requirements of national emission regulations, the diesel engine of a commercial vehicle generally adopts an electric control common rail system, the pressure range of the system is 1800 bar-2000 bar, an in-line common rail pump is generally adopted as an oil pump, and a mechanical pressure limiting valve is generally adopted as a high-pressure oil rail. In a low-temperature environment, if the low-pressure fuel of the commercial vehicle has poor flowing performance, the starting is difficult.

Disclosure of Invention

The invention aims at the problems and provides a low-pressure and high-pressure oil supply system which can effectively prolong the life cycle of an electric control unit pump, upgrade the electric control unit pump system into a common rail system under the condition of unchanging the structure of an engine cylinder body, has lower system cost and can use fuel oil with high cold filter plugging point temperature to pneumatically operate the engine under the low-temperature environment.

According to the technical scheme of the invention: a low high pressure oil supply system which characterized in that: the oil inlet of the high-pressure oil rail is connected with the high-pressure outlet of an electric control monoblock pump, the electric control monoblock pump is fixed in an engine cylinder body and is connected with a roller body, the roller body is driven by an oil pump cam to lift, and a low-pressure oil return port of the electric control monoblock pump is connected with an oil return module; an oil inlet of the electric control unit pump is connected with an oil outlet of the oil supply device; the high-pressure oil rail is integrated with an electric control pressure regulating valve, the electric control pressure regulating valve is connected with an oil return module, a high-pressure outlet of the high-pressure oil rail is connected with the common rail oil injector, a low-pressure oil return port of the common rail oil injector is connected with an oil return module, an overflow valve is arranged on the oil return module, an oil return port of the oil return module is connected with a temperature regulation control valve through a pipeline, an internal oil passage of the temperature regulation control valve is connected with a fuel oil strainer, and an external oil pipe.

As a further improvement of the invention, the fuel supply device comprises a fuel tank, an oil outlet of the fuel tank is connected with a fuel coarse filter through an oil pipe, an oil outlet of the fuel coarse filter is connected with an oil inlet of a fuel delivery pump through an oil pipe, an oil outlet of the fuel delivery pump is connected with an oil inlet of a fuel fine filter through an oil pipe, and an oil outlet of the fuel fine filter is connected with an oil outlet of the fuel supply device.

As a further improvement of the invention, two groups of the electric control unit pumps are provided, the two groups of the electric control unit pumps are connected on the high-pressure oil rail in parallel, the low-pressure oil return channels of the two groups of the electric control unit pumps are connected with the oil return module after being connected in parallel, and the low-pressure oil inlet channels of the two groups of the electric control unit pumps are connected with the oil outlet of the oil supply device after being connected in parallel.

As a further improvement of the invention, the oil return module comprises a module body, wherein an electronic unit pump oil return passage, an electronic control pressure regulating valve oil return passage, a common rail oil injector oil return passage and a main oil return passage are arranged on the module body, a cavity is arranged at the lower end ports of the electronic control pressure regulating valve oil return passage and the common rail oil injector oil return passage, the main oil return passage is arranged at the lower end of the cavity, and an overflow valve is arranged at the lower part of the electronic control unit pump oil return passage.

The invention has the technical effects that: compared with a common rail system, the low-high pressure oil supply system has the advantages that the performance is equivalent, the life cycle of the electric control monoblock pump technology is prolonged, the electric control monoblock pump system is upgraded into the common rail system under the condition that the structure of an engine cylinder body is not changed, and the system cost is low; meanwhile, the engine can be started and operated by using fuel oil with high cold filter plugging point temperature in a low-temperature environment.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the oil return module of the present invention.

Fig. 3 is a schematic structural diagram of the electronically controlled monoblock pump of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

Fig. 1 ~ 3 includes a fuel tank 1, a fuel coarse filter 2, a temperature control valve 3, a fuel delivery pump 4, a fuel fine filter 5, a fuel pump cam 6, a roller body 7, an electronic unit pump 8, a low-pressure fuel inlet channel 8.1, a low-pressure oil return channel 8.2, a high-pressure fuel rail 9, an electronic pressure regulating valve 10, a common rail fuel injector 11, a fuel return module 12, an electronic unit pump return oil channel 12.1, an electronic pressure regulating valve return oil channel 12.2, a common rail fuel injector return oil channel 12.3, a total return oil channel 12.4, and the like.

As shown in fig. 1, the invention is a low-pressure and high-pressure oil supply system, which comprises a high-pressure oil rail 9, wherein an oil inlet of the high-pressure oil rail 9 is connected with a high-pressure outlet of an electric control unit pump 8, the electric control unit pump 8 is fixed in an engine cylinder body, the electric control unit pump 8 is connected with a roller body 7, the roller body 7 is driven by an oil pump cam 6 to lift, and a low-pressure oil return port of the electric control unit pump 8 is connected with an oil return module 12; an oil inlet of the electric control unit pump 8 is connected with an oil outlet of the oil supply device; an electronic control pressure regulating valve 10 is integrated on a high-pressure oil rail 9, the electronic control pressure regulating valve 10 is connected with an oil return module 12, a high-pressure outlet of the high-pressure oil rail 9 is connected with a common-rail oil injector 11, a low-pressure oil return port of the common-rail oil injector 11 is connected with the oil return module 12, an overflow valve 13 is arranged on the oil return module 12, an oil return port of the oil return module 12 is connected with a temperature regulation control valve 3 through a pipeline, an internal oil duct of the temperature regulation control valve 3 is connected with a fuel oil strainer 2, and an external oil pipe.

The oil supply device comprises a fuel tank 1, an oil outlet of the fuel tank 1 is connected with a fuel coarse filter 2 through an oil pipe, an oil outlet of the fuel coarse filter 2 is connected with an oil inlet of a fuel delivery pump 4 through an oil pipe, an oil outlet of the fuel delivery pump 2 is connected with an oil inlet of a fuel fine filter 5 through an oil pipe, and an oil outlet of the fuel fine filter 5 is connected with an oil outlet of an oil supply device.

As shown in fig. 3, there are two groups of electric control unit pumps 8, two groups of electric control unit pumps 8 are connected in parallel to the high-pressure oil rail 9, the low-pressure oil return channels 8.2 of the two groups of electric control unit pumps 8 are connected in parallel and then connected with the oil return module 12, and the low-pressure oil inlet channels 8.1 of the two groups of electric control unit pumps 8 are connected in parallel and then connected with the oil outlet of the oil supply device.

The upper end face of the pump body of the electric control monoblock pump 8 is provided with a low-pressure oil inlet channel 8.1 and a low-pressure oil return channel 8.2, so that an oil inlet and return channel is prevented from being additionally arranged on an engine body, and the structure of the engine body is changed.

As shown in fig. 2, the oil return module 12 includes a module body, an electronic unit pump oil return passage 12.1, an electronic control pressure regulating valve oil return passage 12.2, a common rail injector oil return passage 12.3, and a total oil return passage 12.4 are provided on the module body, a cavity is provided at a lower port of the electronic control pressure regulating valve oil return passage 12.2 and the common rail injector oil return passage 12.3, the total oil return passage 12.4 is provided at a lower end of the cavity, an overflow valve 13 is provided at a lower portion of the electronic control unit pump oil return passage 12.1, and when the module operates, all return oil returns to the temperature regulation control valve 3.

In the product of the invention, the high-pressure oil rail 9 is provided with six high-pressure outlets which are respectively connected with a common rail oil atomizer 11, and when the product works, the common rail oil atomizer 11 sprays fuel oil to enter a cylinder to participate in combustion.

The product of the invention adopts 2 independent electric control monoblocks 8 as oil pumping units, each electric control monoblock 8 is directly inserted into an engine cylinder body, an oil pump cam 6 is integrated on an engine camshaft, a roller body 7 is arranged in the engine cylinder body, each electric control monoblock 8 can independently and accurately control oil supply quantity, the oil supply pressure can reach 2000bar, and any electric control monoblock pump is damaged and does not influence the other normal oil supply.

When the engine is in a low-temperature starting working condition, the ECU controls the opening of the electric control pressure regulating valve to regulate the pressure and the stability of the oil rail, and meanwhile, high-pressure oil leaks to generate low-pressure high-temperature fuel oil which flows back to the temperature regulating control valve 3 through the oil return module 12 and enters the fuel oil rough filter 2 under the action of the temperature regulating control valve 3 to be mixed with cold oil entering the fuel tank 1 and heat the cold oil, so that the cold starting performance of the engine is improved.