CN115750070B - A non-road diesel engine air intake working fluid and fuel thermal management system and control method - Google Patents

Abstract

The invention discloses a non-road diesel engine air inlet working medium and fuel heat management system and a control method, wherein the system comprises an intercooler, a single-pass valve, a heat exchanger, a controller, a fluid storage tank, a temperature sensor, a filter, a fuel pump, a fluid pipeline, an electromagnetic valve, a turbocharger, an engine body and an engine air inlet pipe which are connected in sequence; the heat exchanger comprises a heat exchange box, a box cover plate, a temperature sensor seat, an air inlet guide shell, a heat exchange tube seat and an air inlet runner; the control method comprises the following steps: constructing a controller, an electromagnetic valve and a heat exchange box; setting a target temperature and a protection temperature; judging whether the temperature of the heat exchange water is higher than a target temperature or not, and judging whether the temperature of the fuel is higher than a protection temperature or not; and controlling the water temperature of the heat exchange box to be constant based on the judging result. The invention can realize waste heat utilization, controllable fuel temperature, automatically control and realize temperature protection according to different fuels required to be heated, improve the working performance of the diesel engine under the low-temperature condition, and optimize the vaporization effect of the multi-element fuel.

Description

A non-road diesel engine air intake working fluid and fuel thermal management system and control method

technical field

The invention belongs to the technical field of thermal energy, and in particular relates to a non-road diesel engine air intake working fluid and fuel thermal management system and control method.

Background technique

In recent years, due to the promulgation of the "dual carbon" target, the research on engines with multiple multi-fuel injections including methanol/diesel dual fuel engines is in full swing. Many of the liquid fuels have a large latent heat of vaporization, which is not conducive to the vaporization of the fuel, thereby affecting the performance of the engine. Therefore, it needs to be heated to an appropriate temperature according to different fuels.

On a supercharged engine, high-temperature and high-pressure gas will be generated after passing through the supercharger, and an intercooler is often required to cool the intake air; on some high-power engines with a high boost ratio, a multi-stage intake air cooling device is often installed , to meet actual needs.

Because parameters such as engine intake temperature and flow rate have a much greater impact on engine operating conditions than exhaust, most of the existing devices use exhaust energy to heat the fluid, and use less intake energy.

Contents of the invention

The object of the present invention is to provide a non-road diesel engine air intake working medium and fuel thermal management system and control method to solve the above-mentioned problems in the prior art.

On the one hand, in order to achieve the above object, the present invention provides a non-road diesel engine air intake working fluid and fuel thermal management system, including an intercooler, a one-way valve, a heat exchanger, a controller, a fluid storage tank, and a temperature Sensors, filters, fluid pumps, fluid pipelines, solenoid valves, turbochargers, engine blocks, engine intake pipes;

The heat exchanger includes a heat exchange box, a box cover plate, a temperature sensor seat, an air intake guide shell, a heat exchange tube, a heat exchange tube seat, and an air intake channel; the heat exchange box is provided with hot water, The heat exchange tube is provided with a fluid;

The controller is used to control the water temperature in the heat exchange box to be constant.

Optionally, the heat exchange box is used to heat the fluid in the heat exchange tube based on the heat of high-temperature intake air and the exchange water.

Optionally, a fluid parameter database is provided in the controller, and the fluid parameter database is used to set the target temperature for heating, the maximum temperature and the minimum temperature for normal operation of the system.

Optionally, the controller collects a temperature signal based on the temperature sensor, controls the opening and closing of the electromagnetic valve based on the temperature signal, and controls the temperature of the water in the heat exchange box to be constant based on the opening and closing of the electromagnetic valve.

Optionally, the heat exchange box is a cuboid, and the surface of the heat exchange box is provided with grooves at a distance of 3 mm for heat conduction.

Optionally, the air passing through the turbocharger can enter the heat exchange box from any end, and the temperature sensor interface on the heat exchanger is 5mm away from the outlet end of the heat exchange tube.

On the other hand, in order to achieve the above object, the present invention provides a control method of a non-road diesel engine intake working fluid and fuel thermal management system, including:

S1. Construct a controller for setting the target temperature and protection temperature, a solenoid valve, and a heat exchange box for heating fluid based on exchanging water;

S2. Select the fluid type that needs to be heated, and set the target temperature and protection temperature based on the fluid type;

S3. Judging based on the controller whether the temperature of the exchanged water is greater than the target temperature, judging whether the temperature of the fluid is greater than the protection temperature, and obtaining a judgment result;

S4. Control the water temperature of the heat exchange box to be constant based on the judgment result.

Optionally, the target temperature is a temperature at which the fluid needs to be heated, and the protection temperature is a temperature at which the heat exchange box reaches a constant water temperature.

Optionally, the process of controlling the water temperature of the heat exchange box to be constant based on the judgment result includes:

If the water temperature of the exchanged water is greater than the target temperature and the temperature of the fluid is greater than the protection temperature, then close the solenoid valve; The cooling degree of the cooler is adjusted so that the intake air temperature is stabilized within the target temperature, and step S2 is executed again.

Optionally, the process of separately judging whether the water temperature of the exchanged water is greater than the target temperature includes:

If the water temperature of the exchanged hot water is greater than the target temperature, then close the electromagnetic valve; if the water temperature of the exchanged hot water is not greater than the target temperature, then open the electromagnetic valve.

Technical effect of the present invention is:

The invention can realize the thermal management of the intake working fluid and fuel of the non-road diesel engine. The fluid to be heated flows into the heat exchange tube, and the high-temperature compressed air enters the heat exchange box from the air inlet, and the cooling water is used as the heat exchange medium to inject into the heat exchange box, so that the heat in the high-temperature air compressed by the supercharger can be transferred to the cooling water. Then to the heat transfer of the heat exchange tube.

The invention can realize temperature control. Through the temperature sensors installed on the intake pipe, heat exchange box, and fluid pipeline respectively, the signal is transmitted to the controller, and then the controller controls the opening of the solenoid valve to adjust the flow rate of the high-temperature gas through the heat exchange box, thereby achieving the goal of controlling the flow rate of the heat exchange tube. The temperature of the required heating fluid is controllable.

In the present invention, the controller is provided with several fluid parameters for intake port injection that are often applied on dual-fuel engines, including the target temperature that needs to be heated to achieve, the maximum temperature that enables the entire device to operate normally, and the entire device to be able to operate normally. The lowest temperature for normal operation can realize automatic temperature protection according to different fluids that need to be heated.

Description of drawings

The drawings constituting a part of the application are used to provide further understanding of the application, and the schematic embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is a structural diagram of the intake working fluid and fuel thermal management system of a non-road diesel engine in an embodiment of the present invention;

Fig. 2 is the exterior view of the heat exchanger in the embodiment of the present invention;

Fig. 3 is the exterior view of the heat exchanger with the box shell removed in the embodiment of the present invention;

Fig. 4 is a diagram of the gas guiding device in the embodiment of the present invention;

Fig. 5 is a logic diagram of a control method of a non-road diesel engine air intake working fluid and fuel thermal management system in an embodiment of the present invention;

Description of drawings: 1-intercooler, 2-one-way valve, 3-heat exchanger, 4-controller, 5-fluid storage tank, 6-temperature sensor, 7-filter, 8-fluid pump, 9 -fluid pipeline, 10-solenoid valve, 11-turbocharger, 12-engine body, 13-engine intake pipe, 14-heat exchange box, 15-box cover, 16-temperature sensor seat, 17-intake Air guide shell, 18-heat exchange tube, 19-heat exchange tube seat, 20-intake air channel with grille.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that the steps shown in the flowcharts of the accompanying drawings may be performed in a computer system, such as a set of computer-executable instructions, and that although a logical order is shown in the flowcharts, in some cases, The steps shown or described may be performed in an order different than here.

Embodiment one

As shown in Figures 1-4, this embodiment provides a non-road diesel engine intake working fluid and fuel thermal management system, including sequentially connected:

Intercooler 1, one-way valve 2, heat exchanger 3, controller 4, fluid storage tank 5, temperature sensor 6, filter 7, fluid pump 8, fluid pipeline 9, solenoid valve 10, turbocharger 11 , engine body 12, engine intake pipe 13; The air passage 20 ; the heat exchange box 14 is provided with exchange water, and the heat exchange tube 18 is provided with fluid.

The heat exchange box is fixed together by the intake air channel with grille and the uniformly arranged heat exchange tubes through the heat exchange tube base; the front and rear baffles and the body of the heat exchange box jointly form a water exchange container. An air intake guide shell is installed on the baffle; a solenoid valve on the air intake, four temperature sensors and controllers respectively installed on the fluid pipeline, the heat exchange box, and the air intake form a constant temperature control device.

The heat exchange box is in the shape of a cuboid, and the surface is designed with grooves at a distance of 3mm for heat conduction. The distance between the outlet ends of the heat exchange tubes is 5mm.

The heat exchange box 14 is used for heating the fluid in the heat exchange pipe 18 based on the heat of the high-temperature intake air and the exchange water. The heat is conducted from the high-temperature intake air to the exchange water in the heat exchange box, and then the fluid in the heat exchange tube is heated by the exchange water.

A fluid parameter database is provided in the controller 4, and the fluid parameter database is used to set the target temperature for heating, the maximum temperature and the minimum temperature for normal operation of the system.

The parameter database contains several fluids including methanol, through which the heating device can be protected and easy to operate.

On both sides of the wide surface of the air intake channel with grille, grooved tube sockets for fixing the heat exchange tubes are cast. And the front air baffle is fixed. The box is filled with heat exchange medium water between the heat exchange tube and the air intake channel, so that the heat heats the water first, and then the fluid in the heat exchange tube is heated by the water, and then the temperature in the heat exchange box is kept constant through the corresponding control strategy. Meet actual needs.

The two ends of the air inlet and outlet can be connected by flanges, and the heat exchange tubes can be connected by clamps. A one-way valve and a filter are arranged on the heat exchange tube. A water pump and a solenoid valve are installed on the intake pipe, and the high-temperature gas flow can be adjusted by controlling the opening of the solenoid valve, thereby controlling the water temperature. At the same time, two water temperature sensors are respectively located on the box body near the outlet of the heating pipe and at the inlet of the intake pipe to monitor the engine intake temperature in real time.

The intake air temperature sensor, the fluid temperature sensor in the heat exchange tube, the solenoid valve and the intercooler are connected with the electronic control unit. When the temperature sensor detects that the temperature at the rear end of the intercooler rises, the cooling degree of the intercooler is adjusted to stabilize the intake air temperature.

The intake working medium and fuel thermal management system of the non-road diesel engine in this embodiment is equipped with a solenoid valve 10 and a temperature sensor 6 . There is a heat exchange tube 18 inside the heat exchange box 3, and the low-temperature fluid enters from the inlet of the heat exchange tube 18, is heated after being circulated in the box, flows into the fluid pipeline 9, and then flows through the filter 9 to enter the fluid storage tank 5 . The low-temperature fluid passes through the fluid pipeline 9 from the fluid tank 5, passes through the fluid pump 8 and the filter 7, and enters the heat exchange tube 18 on the tank body. At the same time, the heat exchange tubes 18 are fixed by the heat exchange tube bases 19 connected to the box cover plate 15 and the intake air channel 20 with a grid.

During use, the heat exchanger 3 is installed in parallel on the engine intake pipe, and the heat exchange box is filled with exchanged water. The intercooler 2, the temperature sensor 6 and the solenoid valve 10 are connected with the controller 5. The fluid pipelines 9 and the like are connected sequentially as shown in FIG. 1 . Start the engine, turn on the fluid pump 8, wait for the intake air temperature to rise, assuming 130°C, first select the heating fluid in the control system, and set the specific temperature K that the fluid in the heat exchange tube 18 needs to be heated to, assuming 60°C. The controller 5 recognizes the fluid temperature through the temperature sensor 6. Assume that the temperature of the fluid is 25°C, which is lower than the target K; the water temperature in the heat exchanger box is 25°C, which is lower than K, then the solenoid valve is in the open state, and the heat exchanger 3 box is filled with non-flowing fluid. Change the hot water. As the exchange water is heated by the high-temperature air entering the intake runner 20 with grills, the fluid in the heat exchange tubes 18 is then heated by the cooling water. When the water temperature is greater than 60°C, assuming 61°C, close the solenoid valve 10 so that high-temperature air cannot enter the heat exchange box. At this time, control the intercooler 2 to adjust the cooling degree to stabilize the intake air temperature of the engine inlet; when the water temperature drops to 59°C , open the electromagnetic valve 10, and the high-temperature intake air heats the heat exchange box again until it is heated to 60° C. At this time, the fluid in the heat exchange tube 18 is also heated to about 60° C. The types of fluids and the setting values of target temperature, protection temperature and boiling point are shown in Table 1.

Table 1

heated fluid Recommended target temperature K Protection temperature K1 boiling point Methanol 60℃ 63°C 64.8°C ethanol 70°C 77°C 78.3°C Butanol 90°C 95°C 117°C n-pentanol 90°C 95°C 138.46°C acetone 50℃ 55°C 56.5°C gasoline 60℃ 95°C -

Embodiment two

As shown in Figure 5, this embodiment provides a control method for the intake working fluid and fuel thermal management system of a non-road diesel engine, including:

S1. Construct a controller for setting the target temperature and protection temperature, a solenoid valve, and a heat exchange box for heating fluid based on exchanging water;

S2. Select the fluid type that needs to be heated, and set the target temperature and protection temperature based on the fluid type;

S3. Based on the controller, judge whether the temperature of the exchanged water is higher than the target temperature, judge whether the temperature of the fluid is higher than the protection temperature, and obtain the judgment result;

S4. Control the water temperature of the heat exchange box to be constant based on the judgment result.

In some embodiments, the target temperature is the temperature at which the fluid needs to be heated, and the protection temperature is the temperature at which the heat exchange box reaches a constant water temperature.

In some embodiments, the process of controlling the water temperature of the heat exchange box to be constant based on the judgment result includes:

If the temperature of the exchanged water is greater than the target temperature and the temperature of the fluid is greater than the protection temperature, the solenoid valve is closed; if not, it is judged separately whether the temperature of the exchanged water is greater than the target temperature. Then adjust the cooling degree of the intercooler to keep the intake air temperature stable at the set temperature, and re-execute step S3.

In some embodiments, the process of separately judging whether the temperature of the exchanged water is greater than the target temperature includes:

If the water temperature of the exchanged hot water is higher than the target temperature, the electromagnetic valve is closed; if the water temperature of the exchanged hot water is not greater than the target temperature, the electromagnetic valve is opened.

The above is only a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any skilled person familiar with the technical field can easily think of changes or Replacement should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (5)

1. A non-road diesel engine intake working fluid and fuel thermal management system, characterized in that it comprises an intercooler (1), a one-way valve (2), a heat exchanger (3), a controller (4), a fluid Storage box (5), temperature sensor (6), filter (7), fluid pump (8), fluid pipe (9), solenoid valve (10), turbocharger (11), engine block (12) , engine intake pipe (13); The heat exchanger (3) is connected to the engine body (12) through the engine intake pipe (13); the intercooler (1) is connected to the heat exchanger through the engine intake pipe (13). between the device (3) and the engine block (12); The one-way valve (2) is arranged on the engine intake pipe (13) between the intercooler (1) and the outlet end of the heat exchanger (3); The controller (4) is respectively connected to the intercooler (1), the temperature sensor (6), and the solenoid valve (10); The fluid storage tank (5) is connected to the inlet end of the heat exchanger (3) through the fluid pipeline (9); The temperature sensor (6) is respectively arranged on the engine intake pipe (13) at both ends of the intercooler (1), on the heat exchanger (3), and on the fluid pipeline (9); The filter (7) and the fluid pump (8) are respectively arranged on the fluid pipeline (9); The electromagnetic valve (10) is arranged on the engine intake pipe (13) between the intercooler (1) and the inlet port of the heat exchanger (3); The turbocharger (11) is arranged on the engine intake pipe (13) below the engine block (12); The heat exchanger (3) includes a heat exchange box (14), a box cover (15), a temperature sensor seat (16), an air intake guide shell (17), a heat exchange tube (18), a heat exchange tube seat (19), air intake channel (20); said heat exchange box (14) is provided with exchange water, and said heat exchange tube (18) is provided with fluid; Both the box cover (15) and the air intake guide shell (17) are two, and the heat exchange box (14) is fixedly installed on the opposite side of the two box covers (15). side; The two box cover plates (15) are respectively fixedly installed on the opposite sides of the two air intake guide shells (17); The temperature sensor seat (16) is fixedly mounted on the box cover (15); the temperature sensor seat (16) is fixedly mounted with the temperature sensor (6); The controller (4) is used to control the water temperature in the heat exchange box (14) to be constant; the controller (4) is provided with a fluid parameter database, and the fluid parameter database is used to set the target temperature of heating , the maximum and minimum temperature for the normal operation of the system; The intake guide shell (17) at the inlet end of the heat exchanger (3) communicates with the engine intake pipe (13) at the inlet of the intercooler (1); The intake guide shell (17) at the outlet end of the heat exchanger (3) communicates with the engine intake pipe (13) at the outlet of the intercooler (1); The heat exchange tubes (18) are staggeredly distributed on both sides of the air intake channel (20); Heat exchange tube bases (19) with grooves for fixing the heat exchange tubes (18) are cast on both sides of the air intake channel (20); Between the heat exchange tube (18) and the air intake channel (20), there is hot water for exchange; The heat exchange box (14) heats the fluid in the heat exchange tube (18) based on the heat of the high-temperature intake air and the exchange water; the heat is transferred from the high-temperature intake air to the exchange water in the heat exchange box (14), Then heat the fluid in the heat exchange tube (18) by the exchange water; The working process of the non-road diesel engine air intake working medium and fuel thermal management system includes the following steps: S1. Construct the controller (4), solenoid valve (10), intercooler (1) and heat exchange box (14) for heating fluid based on exchange water for setting target temperature and protection temperature; The target temperature is the temperature to which the fluid needs to be heated, and the protection temperature is the temperature at which the heat exchange box reaches a constant water temperature; S2. Select the fluid type that needs to be heated, and set the target temperature and protection temperature based on the fluid type; S3. Judging based on the controller whether the temperature of the exchanged water is greater than the target temperature, judging whether the temperature of the fluid is greater than the protection temperature, and obtaining a judgment result; S4. Control the water temperature of the heat exchange box (14) to be constant based on the judgment result; The process of controlling the constant water temperature of the heat exchange box (14) based on the judgment result includes: If the water temperature of the exchanged water is greater than the target temperature and the temperature of the fluid is greater than the protection temperature, then close the solenoid valve (10); The cooling degree of the intercooler (1) stabilizes the intake air temperature within the target temperature, and re-executes step S2; The process of separately judging whether the temperature of the exchanged water is greater than the target temperature includes: If the water temperature of the exchanged hot water is greater than the target temperature, then close the electromagnetic valve (10); if the water temperature of the exchanged hot water is not greater than the target temperature, then open the electromagnetic valve (10). 2. The non-road diesel engine air intake working medium and fuel thermal management system according to claim 1, characterized in that, the heat exchange box (14) is used for the heat exchange based on the heat of high-temperature intake air and the heat exchange water The fluid in the heat exchange tube (18) is heated. 3. The non-road diesel engine air intake working medium and fuel thermal management system according to claim 1, characterized in that the controller (4) collects temperature signals based on the temperature sensor (6), and based on the temperature signals The opening and closing of the electromagnetic valve (10) is controlled, and the water temperature in the heat exchange box (14) is controlled to be constant based on the opening and closing of the electromagnetic valve (10). 4. The non-road diesel engine air intake working medium and fuel thermal management system according to claim 1, characterized in that, the heat exchange box (14) is a cuboid, and the surface of the heat exchange box (14) is provided with a distance 3 mm grooves for heat conduction. 5. The non-road diesel engine air intake working medium and fuel thermal management system according to claim 1, characterized in that the air passing through the turbocharger (11) can enter the heat exchange box (14) from any end ), the temperature sensor interface on the heat exchanger (3) is 5mm apart from the outlet end of the heat exchange tube (18).