CN215640145U

CN215640145U - Engine oil consumption measuring and controlling device

Info

Publication number: CN215640145U
Application number: CN202121027274.1U
Authority: CN
Inventors: 李亮; 刘颖
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2022-01-25
Anticipated expiration: 2031-05-14

Abstract

The utility model discloses an engine oil consumption measuring and controlling device, which comprises an oil tank, wherein a pressure stabilizing oil tank is connected to the oil tank in series, the pressure stabilizing oil tank is connected to an oil inlet interface of an engine through an oil inlet pipeline of the engine, and a pre-oil supply pump, a pre-oil supply heat exchanger, a fuel oil flowmeter, a main circulating oil pump, a heat exchanger and an oil supply temperature and pressure sensor are sequentially arranged on the oil inlet pipeline of the engine; the engine oil return interface is connected to an engine oil inlet pipeline between the fuel flow meter and the main circulating oil pump through an engine oil return pipeline, an oil return oil pump and a one-way valve are arranged on the engine oil return pipeline, the oil supply temperature and pressure sensor is in signal connection with the PLC control system, and the pre-oil supply pump, the main circulating oil pump and the oil return oil pump are controlled by the PLC. The utility model has the functions of measuring the oil consumption, controlling the fuel temperature and controlling the oil inlet and return pressure, and has high practical value.

Description

Engine oil consumption measuring and controlling device

Technical Field

The utility model relates to the technical field of engine oil consumption measurement, in particular to an engine oil consumption measurement and control device.

Background

As one of the main indexes for measuring the economic performance of the engine, the oil consumption is an essential measurement parameter in an engine test, and the fuel temperature is required to be controlled for ensuring the measurement accuracy and repeatability; in addition, for an electronic control engine, the oil inlet pressure and the oil return pressure of the engine also need to be controlled within the required parameter range of an engine fuel pump, otherwise, the error rail pressure report can be caused to influence the normal operation of the engine.

For the above functional requirements, three are required at present to be completed together: the fuel consumption measuring instrument, the fuel temperature control equipment and the oil inlet and return pressure control equipment. The three devices can complete the accurate measurement of the oil consumption in the engine test process. From the practical use, the existing equipment has a plurality of improvement spaces, and the following defects exist:

1. the three devices can work normally at the same time to finish the accurate measurement of the oil consumption in the engine test process. For the engine test, the equipment cost is increased, the field space is occupied, the mobile installation is inconvenient, and the mobile test requirements of the engine or the whole vehicle cannot be met;

2. the control precision of the oil inlet and return pressure is low, the whole-process automatic adjustment cannot be realized, and the test efficiency is low. The oil inlet and return pressure adjusting device of the engine in the current market mainly adopts a mechanical pressure regulating valve to complete pressure regulation, cannot automatically adjust when the operating condition or oil consumption of the engine changes, needs an operator to adjust the mechanical pressure regulating valve for multiple times in the operating process of the engine, and has low control precision and low test efficiency;

3. the oil consumption measured value fluctuates in the oil filling process of the equipment, and the measurement accuracy is influenced. The premise of accurate measurement of the fuel flow meter is that the pressure and the temperature of fuel flowing through the fuel flow meter are stable. In the oil filling process of an oil tank, the pressure impact of oil supply from the front end of the existing equipment can cause the fluctuation of the fuel pressure at the front end of a flowmeter, and further the measured value of a fuel mass flow sensor is greatly fluctuated, so that the fuel consumption rate of the equipment is greatly fluctuated and the repeatability is poor even if the power of an engine is stable in the period of oil filling of the equipment.

Disclosure of Invention

The utility model aims to provide an engine oil consumption measuring and controlling device which has the functions of measuring oil consumption, controlling fuel oil temperature and controlling oil inlet and return pressure.

In order to solve the technical problem, the utility model comprises an oil tank, and is structurally characterized in that a pressure stabilizing oil tank is connected to the oil tank in series, the pressure stabilizing oil tank is connected to an oil inlet interface of an engine through an oil inlet pipeline of the engine, and a pre-oil supply pump, a pre-oil supply heat exchanger, a fuel oil flow meter, a main circulating oil pump, a heat exchanger and an oil supply temperature and pressure sensor are sequentially arranged on the oil inlet pipeline of the engine; the engine oil return interface is connected to an engine oil inlet pipeline between the fuel flow meter and the main circulating oil pump through an engine oil return pipeline, an oil return oil pump and a one-way valve are arranged on the engine oil return pipeline, the oil supply temperature and pressure sensor is in signal connection with the PLC control system, and the pre-oil supply pump, the main circulating oil pump and the oil return oil pump are controlled by the PLC.

And a temperature and pressure sensor before the flowmeter is arranged on an engine oil inlet pipeline between the pre-fuel-supply heat exchanger and the fuel flowmeter, and the temperature and pressure sensor before the flowmeter is in signal connection with the PLC control system.

A bypass pipeline is arranged between the front end of the fuel flow meter and the pressure stabilizing oil tank, and a pressure regulating valve is arranged on the bypass pipeline.

An engine oil inlet pipeline between the fuel flow meter and the main circulating oil pump is provided with an exhaust pipeline leading to an oil tank, the exhaust pipeline is provided with a bubble detector and an exhaust electromagnetic valve, the bubble detector is in signal connection with a PLC control system, and the exhaust electromagnetic valve is controlled by the PLC.

And an oil return temperature pressure sensor is arranged on an oil return pipeline of the engine and is in signal connection with the PLC control system.

And a first one-way pressure regulating valve is connected between the oil inlet and the oil return port of the oil return pump in parallel.

The pre-oil supply heat exchanger is connected with a water inlet pipeline and a water outlet pipeline of the heat exchanger in parallel, a first automatic exhaust valve is arranged on the water inlet pipeline of the pre-oil supply heat exchanger, and an electromagnetic valve is arranged on the water outlet pipeline of the pre-oil supply heat exchanger; a water inlet pipeline of the heat exchanger is sequentially provided with a circulating water pump, a water flow switch, a heater, a second automatic exhaust valve and a water temperature sensor, a water outlet pipeline of the heat exchanger is provided with a water return electromagnetic valve, a water inlet pipeline of the heat exchanger at the front end of the circulating water pump and a water outlet pipeline of the heat exchanger at the rear end of the water return electromagnetic valve are provided with a communicating pipe, and the communicating pipe is provided with a second one-way pressure regulating valve; the water flow switch and the water temperature sensor are in signal connection with a PLC control system, and the electromagnetic valve, the circulating water pump, the heater and the water return electromagnetic valve are controlled by the PLC.

An oil charge pump is arranged between the oil tank and the pressure stabilizing oil tank, an overflow pipe is arranged between the pressure stabilizing oil tank and the oil tank, the horizontal installation position of the overflow pipe is higher than the upper limit value of the liquid level in the oil tank, and the oil charge pump is controlled by a PLC.

And a liquid level meter is arranged in the oil tank and is in signal connection with the PLC control system.

The pre-oil supply pump is a variable frequency pump.

After the structure is adopted, the oil consumption measuring system is formed by a pressure stabilizing oil tank, a pre-oil supply pump, a pre-oil supply heat exchanger and a fuel oil flowmeter which are connected in series on the oil tank; the fuel temperature control system consists of a pre-fuel-supply heat exchanger, a main circulating oil pump, a heat exchanger and a fuel supply temperature pressure sensor; the oil inlet and return pressure control system is composed of a main circulating oil pump, a heat exchanger, an oil return oil pump and a one-way valve. All parts of the system are mutually cooperated under the control of the PLC, and a set of complete system with accurate temperature and pressure control and stable oil consumption measurement value is formed together. Therefore, the utility model has the following technical effects:

(1) the fuel oil temperature control system has the functions of measuring the fuel consumption, controlling the fuel oil temperature and controlling the oil inlet and return pressure, integrates the three functions, ensures the measurement and control precision, improves the automation level of equipment and improves the test efficiency;

(2) the double-oil-tank strategy is creatively provided, the stability of the measurement pressure of the fuel flow meter is fully ensured, the problem of large fluctuation of the measured value of the fuel consumption during oil filling is avoided, and the high-accuracy measurement of the fuel consumption is realized by matching with the temperature control function;

(3) the oil inlet pressure and the oil return pressure of the engine are automatically adjusted in a closed loop, so that the test efficiency is improved;

(4) the volume of the equipment is reduced as much as possible so as to meet the use requirements of different occasions. The engine test base has strong practicability no matter the engine test base is fixedly used or is used in an outdoor mobile test;

(5) the defects of the existing equipment are fully considered, the liftable points in the actual use process are comprehensively considered, brand-new design is carried out, and the practical value is high.

Drawings

The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings:

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is an external view of the overall structure of the present invention.

Detailed Description

Referring to the attached drawings, the engine oil consumption measuring and controlling device comprises an oil tank 3, wherein an oil filling pipe is arranged on the oil tank 3, a filter 1 and an oil filling electromagnetic valve 2 are sequentially arranged on the oil filling pipe, an equipment oil inlet A is formed in the end portion of the oil filling pipe and is connected with an external oil supply pipeline through the equipment oil inlet A, an oil discharging pipe is arranged at the bottom of the oil tank 3, a manual residue discharging valve 23 is arranged on the oil discharging pipe, a residue discharging opening G is formed in the end portion of the oil discharging pipe and is used for thoroughly discharging fuel oil in the oil tank, a liquid level meter 7 is arranged in the oil tank 3, and an exhaust opening B is formed in the top of the oil tank 3 and is used for exhausting the oil tank and a system. The oil tank 3 is connected with a pressure stabilizing oil tank 5 in series, an oil charge pump 4 is arranged between the oil tank 3 and the pressure stabilizing oil tank 5, an overflow pipe 6 is arranged between the pressure stabilizing oil tank 5 and the oil tank 3, the horizontal installation position of the overflow pipe 6 is higher than the upper limit value of the liquid level in the oil tank 3, the bottom of the pressure stabilizing oil tank 5 and the bottom of the oil tank 3 are communicated through an oil discharge pipe, and a manual residue discharge valve 23 is arranged on the oil discharge pipe at the section. The pressure stabilizing oil tank 5 is connected to an engine oil inlet port C through an engine oil inlet pipeline, a pre-oil supply pump 8, a pre-oil supply heat exchanger 9, a temperature and pressure sensor 10 in front of a flowmeter, a fuel flowmeter 12, a main circulating oil pump 15, a heat exchanger 16 and an oil supply temperature and pressure sensor 17 are sequentially arranged on the engine oil inlet pipeline, a bypass pipeline is arranged between the front end of the fuel flowmeter 12 and the bottom of the pressure stabilizing oil tank 5, and a pressure regulating valve 11 is arranged on the bypass pipeline. The engine oil return interface D is connected to an engine oil inlet pipeline between the fuel oil flowmeter 12 and the main circulating oil pump 15 through an engine oil return pipeline, an oil return temperature pressure sensor 22, an oil return filter element 21, an oil return oil pump 20 and a one-way valve 19 are sequentially arranged on the engine oil return pipeline from the engine oil return interface D, and a first one-way pressure regulating valve 18 is connected between an oil inlet and an oil return opening of the oil return oil pump 20 in parallel. An exhaust pipeline leading to the oil tank 3 is arranged on an engine oil inlet pipeline between the fuel oil flowmeter 12 and the main circulating oil pump 15, and a bubble detector 13 and an exhaust electromagnetic valve 14 are arranged on the exhaust pipeline. The pre-oil supply heat exchanger 9 is connected with the water inlet and outlet pipelines of the heat exchanger 16 in parallel, a first automatic exhaust valve 25 is arranged on the water inlet pipeline of the pre-oil supply heat exchanger 9, and an electromagnetic valve 26 is arranged on the water outlet pipeline of the pre-oil supply heat exchanger 9; a water inlet pipeline of the heat exchanger 16 is sequentially provided with a circulating water pump 27, a water flow switch 28, a heater 29, a second automatic exhaust valve 30 and a water temperature sensor 31, a water outlet pipeline of the heat exchanger 16 is provided with a water return electromagnetic valve 32, a water inlet pipeline of the heat exchanger 16 at the front end of the circulating water pump 27 and a water outlet pipeline of the heat exchanger 16 at the rear end of the water return electromagnetic valve 32 are provided with communicating pipes, the communicating pipes are provided with a second one-way pressure regulating valve 33, a cooling water inlet interface E and a cooling water outlet interface F are arranged on a water inlet pipeline and a water outlet pipeline of the pre-oil-supply heat exchanger 9 and the heat exchanger 16, and a cooling water filter element 24 is arranged on a water inlet pipeline and a water outlet pipeline shared by the pre-oil-supply heat exchanger 9 and the heat exchanger 16. The liquid level meter 7, the pre-flowmeter temperature and pressure sensor 10, the fuel flowmeter 12, the bubble detector 13, the fuel supply temperature and pressure sensor 17, the return oil temperature and pressure sensor 22, the water flow switch 28 and the water temperature sensor 31 are in signal connection with the PLC control system; the oil-filled pump 4, the pre-oil supply pump 8, the main circulation oil pump 15, the oil return pump 20, the heater 29 and the electromagnetic valves are controlled by the PLC to work. The above components are installed in a cabinet body, referring to fig. 2, the cabinet body is divided into an upper part and a lower part, the I part is a control unit of the equipment, and a PLC control part and an electric control component are mainly installed on the I part. The II part is a measuring and executing unit of the equipment, all executing parts such as a high-precision mass flow meter, an oil pump, a water pump, a heat exchanger and the like are installed, 4 universal wheels are installed at the bottom of the cabinet body so that the equipment can move at any time, and openable doors are arranged on two sides of the cabinet body.

The whole working process of the utility model is as follows:

this device is connected with outside oil supply line from equipment oil inlet A department, and operating personnel starts the equipment back according to the demand, and the level gauge 7 of dress in oil tank 3 begins the liquid level in the real-time measurement oil tank 3 to give PLC with the liquid level signal real-time feedback. When the liquid level reaches the lower limit preset by the system, the PLC gives an oil filling control signal to control the oil filling electromagnetic valve 2 to be powered on and opened, external fuel oil enters the oil tank 3 from the interface A of the oil inlet of the equipment after being filtered by the filter 1 to fill the oil, when the liquid level in the oil tank 3 reaches the upper limit, the PLC stops outputting the oil filling control signal, and the oil filling electromagnetic valve 2 is powered off and closed, so that the liquid level of the fuel oil in the oil tank 3 is always kept in a certain range. Meanwhile, the PLC can judge whether the oil tank 3 is in an oil shortage state according to the liquid level measured by the liquid level meter 7, and when the liquid level in the oil tank 3 is lower than the liquid level for more than 30s, the system can give an alarm.

Under the premise of no oil shortage alarm, the PLC gives a system operation instruction, all system parts of the equipment start to work, fuel in the oil tank 3 is conveyed into the pressure stabilizing oil tank 5 by the oil filling pump 4, and the bottom of the pressure stabilizing oil tank 5 is provided with an oil outlet interface connected with an oil inlet of the pre-oil supply pump 8. The fuel in the pressure stabilizing oil tank 5 is conveyed by the pre-feeding pump 8 to enter an oil inlet of the pre-feeding heat exchanger 9, heat exchange is carried out in the pre-feeding oil tank, the fuel flows out of an oil outlet of the pre-feeding heat exchanger 9 to complete an oil inlet temperature control process of the flowmeter, then enters an oil inlet of the fuel flowmeter 12 to flow out of an oil outlet of the fuel flowmeter 12 to complete an oil consumption measurement process, then enters an oil inlet of the main circulation oil pump 15 after being mixed with the engine return oil, enters an oil inlet of the heat exchanger 16 after passing through an oil supply pressure control process of the main circulation oil pump 15, carries out a heat exchange process with cooling liquid in the heat exchanger 16, then flows out of the oil outlet of the heat exchanger to complete an oil inlet temperature control process of the engine, and then enters the inside of the engine through an oil inlet connector C of the engine.

The return oil of the engine returns from the engine oil return interface D, the return oil of the engine enters equipment from the engine oil return interface D and then enters the oil return filter element 21 for impurity filtration, the filtered fuel oil enters the oil inlet of the oil return pump 20 and then flows out from the outlet of the oil return pump, enters the inlet of the one-way valve 19 and flows out from the outlet of the one-way valve 19 in a one-way mode, and the process of controlling the oil return pressure of the engine is finished. These return oil then mixes with the fuel from the outlet of the fuel flow meter 12 and returns to the inlet of the main circulation oil pump 15 and finally enters the engine interior.

The front end pipeline of the oil inlet of the main circulating oil pump 15 is provided with a bubble detector 13, when the bubble detector detects that bubbles are contained in the oil circuit, a circuit-breaking electric signal is fed back to the PLC, the PLC immediately sends a fuel oil exhaust control signal after receiving the signal, the exhaust electromagnetic valve 14 is controlled to be powered on and opened, the bubbles and part of fuel oil return to the oil tank 3 along the exhaust pipeline, meanwhile, the PLC controls the main circulating oil pump 15 and the oil return oil pump 20 to run at a low speed with a frequency of 5Hz, the pre-oil supply pump 8 runs at a rated rotating speed, and the situation that the fuel oil at the oil inlet of the main circulating oil pump 15 forms negative pressure and the bubbles cannot be discharged is avoided. When the bubble detector 13 detects that no bubble exists in the pipeline, the path electric signal is fed back to the PLC in time, the PLC stops sending an exhaust control instruction after receiving the feedback signal, the exhaust electromagnetic valve 14 is powered off and recovers a default closed state, and the main circulating oil pump 15, the oil return oil pump 20 and the pre-oil supply pump 8 recover a normal working operation mode.

The utility model is composed of three parts of an oil consumption measuring system, a fuel temperature control system and an oil inlet and return pressure control system, and the detailed working process of each stage of the system is introduced as follows:

a) oil consumption measurement system:

an overflow pipe 6 is connected between the pressure-stabilizing oil tank 5 and the oil tank 3, and the horizontal installation position of the overflow pipe is higher than the upper limit value of the liquid level in the oil tank 3. Under the premise that the oil tank 3 has no oil shortage alarm, the PLC outputs a system operation signal to control the oil filling pump 4 to be electrified and operated, fuel oil is extracted from the oil tank 3 and filled into the pressure stabilizing oil tank 5, and after the fuel oil level in the pressure stabilizing oil tank 5 reaches the height of the overflow pipe 6, redundant fuel oil can return to the fuel tank 3 from the overflow pipe 6. Therefore, as long as the flow of the oil charge pump 4 is ensured to be larger than the fuel consumption of the engine, the liquid level in the pressure stabilizing oil tank 5 can be always kept stable, and the fuel pressure in the pressure stabilizing oil tank 5 is also always kept stable because the exhaust port B of the oil tank 3 is communicated with the atmosphere. Therefore, even if the oil filling electromagnetic valve 2 is opened for filling oil after receiving a PLC instruction, external oil supply from the oil inlet A of the equipment cannot form pressure impact on the pressure stabilizing oil tank 5 and fuel oil in a rear end pipeline, and fluctuation of a measured oil consumption value is avoided.

The pre-oil supply pump 8 is used for supplying fuel oil for the fuel oil flow meter 12 and an internal pipeline of the device, the oil outlet of the pre-oil supply pump is connected with the fuel oil inlet of the pre-oil supply heat exchanger 9, after the pre-oil supply pump operates, the fuel oil in the pressure stabilizing oil tank 5 is pressurized by the pre-oil supply pump, then flows into the pre-oil supply heat exchanger 9, exchanges heat in the pre-oil supply heat exchanger, and then flows out from the outlet of the pre-oil supply heat exchanger to the oil inlet of the fuel oil flow meter 12. The fuel flows out from the outlet of the fuel flow meter 12, and in the process, the fuel flow meter 12 can measure the fuel flow passing through the fuel flow meter 12 in real time, namely the fuel consumption of the engine.

Because the oil consumption can change in the running process of the engine, in order to ensure that the oil inlet pressure of the fuel oil flowmeter 12 keeps constant, the pre-oil supply pump 8 adopts a variable frequency pump, a temperature and pressure sensor 10 in front of the flowmeter is arranged between the oil outlet of the pre-oil supply heat exchanger 9 and the oil inlet of the pre-oil supply pump 8, the temperature and pressure sensor measures the oil inlet pressure P0 of the fuel oil flowmeter 12 in real time and feeds back the measured value to the PLC, the PLC compares the received P0 value with the preset value P0 of the system, when P0 is less than P0, the PLC outputs a pre-oil supply pressurization control signal, the running frequency of the pre-oil supply pump 8 is improved, so that the rotating speed of the pre-oil supply pump is increased, and the P0 is increased; when P0 is greater than P0, the PLC outputs a pre-oil supply pressure reduction control signal, reduces the operating frequency of the pre-oil supply pump 8 to reduce the rotating speed of the pre-oil supply pump, and reduces P2. The PLC continuously controls the operation frequency of the pre-oil supply pump 8 through PID closed-loop regulation according to the feedback signal of the temperature and pressure sensor 10 before the flow meter, and changes the operation rotating speed of the pre-oil supply pump to achieve the aim of stabilizing the oil inlet pressure p0 of the fuel oil flow meter 12.

The pre-fuel pump 8 is set with an initial operating speed and a maximum operating speed, and there may be a case where the fuel inlet pressure P0 of the fuel flow meter 12 cannot reach the target value of the system preset pressure P0 within its normal operating range due to the influence of the fuel consumption of the engine in actual use. In order to further ensure that the pressure of the fuel flowing through the fuel flowmeter 12 is stable and is controlled according to different test requirements, the pressure regulating valve 11 is installed at the front end of the fuel flowmeter 12, an operator can manually regulate the pressure regulating valve according to the test requirements, when the oil inlet pressure p0 of the fuel flowmeter 12 needs to be increased, the pressure relief pressure of the pressure regulating valve 11 is manually increased, when the p0 needs to be reduced, the pressure relief pressure is reduced, and after the pressure relief pressure is exceeded, part of the fuel flows back into the pressure stabilizing oil tank 5 through the bypass pipeline.

In the process of measuring the oil consumption, the temperature of the fuel entering the fuel flow meter 12 is controlled to ensure the normal temperature state of the fuel, and the phenomenon that the temperature of the fuel exceeds the measuring condition of the fuel flow meter 12 to influence the measuring result or damage the fuel flow meter 12 is avoided. The temperature control process is as follows:

b) fuel temperature control system:

the fuel temperature control comprises two processes, one is the fuel temperature control of the fuel flowmeter mentioned above, and the other is the fuel temperature control of the engine, and the two processes are realized by means of cooling water heat exchange.

The system is connected with cooling water inlet from a cooling water inlet interface E end, and connected with cooling water outlet from a cooling water outlet interface F end. A cooling water filter element 24 is provided at the water inlet end to prevent impurities in the water from entering the apparatus. Two automatic exhaust valves are arranged on the cooling water path: the first automatic exhaust valve 25 and the second automatic exhaust valve 30 can automatically exhaust when air exists in the cooling water, and the influence on the heat exchange efficiency of the system is avoided.

Controlling the oil inlet temperature of the flowmeter: in order to ensure that the oil inlet temperature of the fuel oil flow meter 12 is constant, the temperature pressure sensor 10 in front of the flow meter detects the oil inlet temperature T1 of the fuel oil flow meter 12 in real time and feeds back the measurement result to the PLC, the PLC compares the measured value T1 of the oil inlet temperature of the flow meter with the preset oil supply temperature T1, when T1 is more than T1, the PLC gives a cooling control signal to control the electromagnetic valve 26 to be powered on and opened, external cooling water from a cooling water inlet connector E enters the pre-oil supply heat exchanger 9 from a water inlet of the pre-oil supply heat exchanger 9 for heat exchange after being filtered by the cooling water filter element 24, then flows out from a water outlet of the pre-oil supply heat exchanger 9, and finally flows out from a cooling water outlet connector F after passing through the electromagnetic valve 26, and the cooling water exchanges heat with fuel oil in the pre-oil supply heat exchanger 9 in the process, so that the fuel oil temperature T1 is reduced; when T1 is less than T1, the PLC stops giving the cooling control signal, the electromagnetic valve 26 is recovered to the default state and is kept closed, and no cooling water flows in the pre-oil supply heat exchanger 9 any more. The PLC controls the on-off time of the electromagnetic valve 26 through PID closed-loop regulation, changes the cooling water flow in the pre-oil supply heat exchanger 9, and achieves the purpose of t1 stabilization.

Controlling the oil inlet temperature of an engine: in order to realize the control of the oil inlet temperature of the engine, an oil supply temperature pressure sensor 17 is arranged on a pipeline at the front end of an oil inlet interface C of the engine and is responsible for measuring the temperature T2 of an oil inlet of the engine in real time and feeding back the temperature to a PLC, the PLC compares the temperature with a set value T2 of the oil inlet temperature of the engine according to T2, when T2 is more than T2, the PLC gives a cooling control signal to control the electrifying of a water return electromagnetic valve 32 to be opened, external cooling water from a cooling water inlet interface E passes through a cooling water filter element 24 to be filtered, then passes through a circulating water pump 27, a water flow switch 28 and a heater 29 to enter a heat exchanger 16 from an water inlet of the heat exchanger 16, flows out from a water outlet of the heat exchanger 16 after exchanging heat with fuel inside the heat exchanger, and finally flows out from a water outlet interface F end of the cooling water after passing through the water return electromagnetic valve 32 along the direction a → b in the figure, and the cooling water exchanges heat with the fuel in the heat exchanger 16 in the process, the fuel temperature t2 is reduced; when T2 is less than T2, the PLC stops giving a cooling control signal, the water return solenoid valve 32 is powered off and returns to a default state to be kept closed, meanwhile, the PLC gives a heating control signal to control the circulating water pump 27 and the heater 29 to start working, cooling water flows along the direction a → c after the circulating water pump 27 runs, enters the heat exchanger 16 from the water inlet of the heat exchanger 16 again after being heated by the heater 29, exchanges heat with fuel oil in the heat exchanger and flows out from the water outlet of the heat exchanger 16, and an internal circulation process is formed. The temperature of the internal circulation coolant rises, and heat exchange achieves a temperature rise of t 2. Similarly, if T2 is greater than T2 again, the PLC is switched to send a cooling control signal, the water return electromagnetic valve 32 is electrified and opened, cooling water circulates along the direction a → b again in the drawing, the water temperature is reduced, and the heat exchange is carried out to reduce the temperature T2.

The oil supply temperature and pressure sensor 17 feeds the t2 temperature value back to the PLC in real time, the PLC continuously sends out a cooling or heating instruction through PID closed-loop regulation, the switching time of the water return electromagnetic valve 32 is controlled, the running of the circulating water pump 27 and the heater 29 is controlled, the circulating direction of cooling water in a pipeline is changed, and finally the accurate control of the oil inlet temperature t2 of the engine is realized.

During the fuel temperature control, there are two preconditions for the heater 29 to heat: firstly, the water flow switch 28 feeds back a PLC conducting signal; secondly, the water temperature measured by the water temperature sensor 31 does not exceed the limit value. A water flow switch 28 is arranged between the water outlet of the circulating water pump 27 and the water inlet of the heater, whether cooling water flows in the pipeline or not is detected, when water flows, the water flow switch 28 outputs a conducting signal to the PLC, the heater 29 is controlled to heat only after the PLC receives the conducting signal fed back by the PLC, otherwise, if the PLC receives an open circuit signal, the heating control signal is stopped to be output, and the heater 29 cannot work. In addition, a water temperature sensor 31 is arranged between the water outlet of the heater 29 and the water inlet of the heat exchanger 16, the temperature of cooling water in the pipeline is measured in real time and fed back to the PLC, and when the measured value exceeds the upper limit of the water temperature set by the system, the PLC stops outputting a heating control command. Both measures are to prevent the heater 29 from burning out due to lack of water or excessive heating of the pipeline.

c) Controlling oil inlet and return pressure of the engine:

the device is connected with an oil inlet of an engine from an oil inlet port C end of the engine, and an oil return port D end of the engine is connected with an oil return port of the engine.

a1) Controlling the oil inlet pressure of the engine: the engine oil inlet pressure control is mainly realized by adjusting the operating frequency of the main circulation oil pump 15. After flowing out from the fuel flowmeter 12, the fuel oil is mixed with engine return oil returned from an engine return oil interface D, enters an oil inlet of the main circulating oil pump 15, then flows out from an outlet of the main circulating oil pump, enters an oil inlet of the heat exchanger 16, flows out from an oil outlet of the heat exchanger after internal heat exchange, and then enters the engine through an engine oil inlet interface C. An oil supply temperature pressure sensor 17 at the rear end of the heat exchanger 16 measures the pressure P1 of an oil inlet of the engine in real time and feeds a measured value back to the PLC, the PLC compares the received P1 value with a set value P1 of the oil supply pressure of the engine, when P1 is less than P1, the PLC outputs an oil supply pressurization control signal, the operating frequency of the main circulating oil pump 15 is increased, the rotating speed of the main circulating oil pump is increased, and therefore P1 is increased; when P1 is greater than P1, the PLC outputs an oil supply pressure reduction control signal, reduces the operating frequency of the main circulation oil pump 15 to reduce the rotating speed of the main circulation oil pump, and reduces P1. The PLC continuously controls and changes the running frequency of the main circulation oil pump 15 through PID closed loop regulation according to the feedback signal of the oil supply temperature pressure sensor 17, and changes the running rotating speed of the main circulation oil pump, so as to achieve the purpose of p1 stabilization.

b1) Controlling the oil return pressure of the engine: the return oil pressure control is realized by the combined operation of the return oil pump 20, the first one-way pressure regulating valve 18, the return oil temperature and pressure sensor 22 and the like. The engine return oil returns to the equipment from an engine return oil interface D, an oil return temperature pressure sensor 22 is arranged between the engine return oil interface D and an oil return filter element 21, the oil return temperature pressure sensor measures the pressure P2 of an engine return oil port in real time and feeds back the measured value to the PLC, the PLC compares the received P2 value with the set value P2 of the engine return oil pressure, when P2 is less than P2, the PLC outputs an oil return pressurization control signal, the operating frequency of the oil return pump 20 is reduced, the rotating speed of the oil return pump is reduced, and P2 is increased; when P2 is greater than P2, the PLC outputs an oil return pressure reduction control signal, the operating frequency of the oil return pump 20 is increased to increase the rotating speed of the oil return pump, and P2 is decreased. The PLC continuously controls the operation frequency of the oil return pump 20 through PID closed-loop regulation according to the feedback signal of the oil return temperature pressure sensor 22, and changes the operation rotating speed of the oil return pump, so as to achieve the purpose of p2 stabilization.

A first one-way pressure regulating valve 18 is connected in parallel between the oil inlet and the oil return port of the oil return pump 20, when the oil return pump 20 cannot meet the requirement of the engine oil return pressure, namely P2 is always greater than P2, the overpressure part can be relieved through the first one-way pressure regulating valve 18, part of the fuel oil directly passes through the first one-way pressure regulating valve 18 from the oil inlet of the oil return pump 20 and returns to the oil inlet of the main circulation oil pump 15, and the relief pressure can be manually regulated by an operator according to the field requirement.

The device measures the oil consumption by utilizing the Coriolis force mass flowmeter, and increases a voltage stabilizing and temperature control device and improves the oil consumption measurement accuracy aiming at the problem that the oil consumption measurement value of the engine has large fluctuation in the oil filling process of the existing equipment so as to cause large measurement deviation of the fuel consumption rate of the engine.

The utility model realizes full-automatic high-precision closed-loop control of fuel temperature and oil inlet and return pressure by frequency conversion technology and PID closed-loop regulation; the device can communicate with an upper computer in real time, can remotely monitor and control the oil inlet and return parameters of the engine in real time, and has the functions of measuring oil consumption, automatically controlling fuel oil temperature and automatically controlling oil inlet and return pressure.

Claims

1. An engine oil consumption measuring and controlling device comprises an oil tank (3), and is characterized in that a pressure stabilizing oil tank (5) is connected to the oil tank (3) in series, the pressure stabilizing oil tank (5) is connected to an engine oil inlet connector (C) through an engine oil inlet pipeline, and a pre-oil supply pump (8), a pre-oil supply heat exchanger (9), a fuel oil flowmeter (12), a main circulating oil pump (15), a heat exchanger (16) and an oil supply temperature and pressure sensor (17) are sequentially arranged on the engine oil inlet pipeline; the engine oil return interface (D) is connected to an engine oil inlet pipeline between the fuel oil flowmeter (12) and the main circulating oil pump (15) through an engine oil return pipeline, an oil return oil pump (20) and a one-way valve (19) are arranged on the engine oil return pipeline, the oil supply temperature and pressure sensor (17) is in signal connection with a PLC control system, and the pre-oil supply pump (8), the main circulating oil pump (15) and the oil return oil pump (20) are controlled by a PLC.

2. The measuring and control device for the oil consumption of the engine according to claim 1, characterized in that a temperature and pressure sensor (10) before a flow meter is arranged on an oil inlet pipeline of the engine between the pre-oil supply heat exchanger (9) and the fuel oil flow meter (12), and the temperature and pressure sensor (10) before the flow meter is in signal connection with a PLC control system.

3. The engine oil consumption measuring and controlling device according to claim 1, wherein a bypass line is provided between the front end of the fuel flow meter (12) and the pressure stabilizing oil tank (5), and a pressure regulating valve (11) is provided on the bypass line.

4. The engine oil consumption measuring and controlling device according to claim 1, wherein an exhaust pipeline leading to the oil tank (3) is arranged on an engine oil inlet pipeline between the fuel oil flow meter (12) and the main circulating oil pump (15), a bubble detector (13) and an exhaust electromagnetic valve (14) are arranged on the exhaust pipeline, the bubble detector (13) is in signal connection with a PLC control system, and the exhaust electromagnetic valve (14) is controlled by a PLC.

5. The measuring and control device for the oil consumption of the engine according to claim 1, wherein a return oil temperature and pressure sensor (22) is arranged on the oil return pipeline of the engine, and the return oil temperature and pressure sensor (22) is in signal connection with a PLC control system.

6. The engine oil consumption measuring and controlling device according to claim 1, characterized in that a first one-way pressure regulating valve (18) is connected in parallel between an oil inlet and an oil return port of the oil return pump (20).

7. The measuring and controlling device of the engine oil consumption according to claim 1, characterized in that the pre-oil supply heat exchanger (9) is connected in parallel with the water inlet and outlet pipeline of the heat exchanger (16), the water inlet pipeline of the pre-oil supply heat exchanger (9) is provided with a first automatic exhaust valve (25), and the water outlet pipeline of the pre-oil supply heat exchanger (9) is provided with an electromagnetic valve (26); a water inlet pipeline of the heat exchanger (16) is sequentially provided with a circulating water pump (27), a water flow switch (28), a heater (29), a second automatic exhaust valve (30) and a water temperature sensor (31), a water outlet pipeline of the heat exchanger (16) is provided with a water return electromagnetic valve (32), a water inlet pipeline of the heat exchanger (16) at the front end of the circulating water pump (27) and a water outlet pipeline of the heat exchanger (16) at the rear end of the water return electromagnetic valve (32) are provided with communicating pipes, and the communicating pipes are provided with second one-way pressure regulating valves (33); the water flow switch (28) and the water temperature sensor (31) are in signal connection with a PLC control system, and the electromagnetic valve (26), the circulating water pump (27), the heater (29) and the water return electromagnetic valve (32) are controlled by the PLC.

8. The engine oil consumption measuring and controlling device according to claim 1, characterized in that an oil filling pump (4) is arranged between the oil tank (3) and the pressure stabilizing oil tank (5), an overflow pipe (6) is arranged between the pressure stabilizing oil tank (5) and the oil tank (3), the horizontal installation position of the overflow pipe (6) is higher than the upper limit value of the liquid level in the oil tank (3), and the oil filling pump (4) is controlled by a PLC.

9. The engine oil consumption measuring and controlling device according to claim 1, characterized in that a liquid level meter (7) is arranged in the oil tank (3), and the liquid level meter (7) is in signal connection with a PLC control system.

10. The engine oil consumption measuring and controlling device according to claim 1, characterized in that the pre-oil supply pump (8) is a variable frequency pump.