Low-engine-oil-consumption IAT valve control system and method for diesel engine

Abstract

The low-engine-oil-consumption IAT valve control system of the diesel engine comprises an ECU controller and an IAT valve actuator, and the IAT valve actuator is composed of a wiring harness connector clip, a motor, an IAT closing valve and an IAT valve position sensor; the input end of the ECU controller is connected with an accelerator pedal position sensor, a rotating speed sensor, an SCR temperature sensor and an IAT valve position sensor. The ECU controller is electrically connected with the wire harness plug connector, the wire harness plug connector is electrically connected with the motor and the IAT valve position sensor, and the driving end of the motor is connected with the IAT closing valve. The invention further discloses a control method for the low-engine-oil-consumption IAT valve of the diesel engine. According to the invention, the problem that the engine oil consumption is increased to 1.5% o and far exceeds the limit value of 0.5% o under the long-time idling working condition of the IAT technical architecture engine is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engines, and in particular relates to a low-fuel-consumption IAT valve control system for a diesel engine, and also relates to a low-fuel-consumption IAT valve control method for a diesel engine. Background Art

[0002] With increasingly stringent emissions regulations, engines use an IAT (Intake Air Flow Control Valve) to raise and maintain exhaust temperatures under low-load conditions, managing the temperature of the SCR (Exhaust Gas Reactor) aftertreatment system to meet emission requirements under these conditions. The IAT valve opening is driven by an electric motor. The motor's input voltage determines the valve opening. The rotation of the motor shaft drives the IAT valve, and the IAT valve's opening influences intake air flow. A wide valve opening results in high intake air flow and low exhaust temperatures, while a narrow valve opening results in low intake air flow and high exhaust temperatures. This keeps the SCR temperature within the required range, effectively treating exhaust gases and meeting emissions requirements.

[0003] In recent years, port trade has flourished, and demand for port tractors has increased annually. Typical operating conditions for port tractors are long engine idling periods, low average speeds, heavy loads, and high fuel consumption. Investigations have found that approximately 68% of port tractor engines experience continuous idling, resulting in low exhaust temperatures. To meet emissions regulations, the IAT valve must limit intake air flow, increase exhaust temperatures, and meet SCR thermal management requirements. However, this flow restriction reduces intake pressure, creating a negative intake pressure in the engine cylinders of approximately 80 kPa absolute, 20 kPa less than the crankcase pressure. This pressure differential causes the piston rings to pump oil into the cylinders, increasing oil consumption by 1.5‰, exceeding the limit of less than 0.5‰. Summary of the Invention

[0004] The first purpose of the present invention is to provide a low-oil-consumption IAT valve control system for a diesel engine, so as to solve the problem that the engine of the IAT technical architecture idles for a long time, causing the oil consumption to increase to 1.5‰, far exceeding the limit of 0.5‰.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a low-fuel-consumption IAT valve control system for a diesel engine, including an ECU controller and an IAT valve actuator, the IAT valve actuator consisting of a wiring harness connector, a motor, an IAT closing valve, and an IAT valve position sensor; the input end of the ECU controller is connected to an accelerator pedal position sensor, a speed sensor, an SCR temperature sensor, and an IAT valve position sensor; the ECU controller is connected to the wiring harness connector, the wiring harness connector is electrically connected to the motor and the IAT valve position sensor, respectively, and the driving end of the motor is connected to the IAT closing valve.

[0006] The technical solution of the present invention also has the following characteristics: The motor is a stepper motor.

[0007] The IAT valve actuator also includes a return spring connected to the IAT closing valve.

[0008] The ECU controller is connected to the power supply.

[0009] The second purpose of the present invention is to provide a low-oil-consumption IAT valve control method for a diesel engine, so as to solve the problem that the engine of the IAT technical architecture idles for a long time, causing the oil consumption to increase to 1.5‰, far exceeding the limit of 0.5‰.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is: a diesel engine low fuel consumption IAT valve control method, which is specifically implemented according to the following steps: Step 1: The engine speed sensor receives the flywheel speed and provides the voltage signal corresponding to the flywheel speed to the ECU controller through the wire. Step 2: The accelerator pedal position sensor converts the accelerator position into a voltage signal and provides it to the ECU controller through a wire. Step 3: The SCR temperature sensor converts the exhaust temperature signal into a voltage signal and provides it to the ECU controller through a wire; In step 4, the ECU controller checks the table to determine whether voltage needs to be provided to the IAT valve actuator based on the engine speed sensor voltage signal, the throttle position voltage signal, and the SCR exhaust gas temperature voltage signal.

[0011] The technical solution of the present invention also has the following characteristics: In step 4: the ECU controller output voltage is 0V-5V, where: 0V indicates that the IAT shut-off valve is fully open; 5V indicates that the IAT shut-off valve is fully closed; and between 0V-5V indicates that the IAT shut-off valve is partially closed.

[0012] In step 4: if the engine idling time is less than 5 minutes, the duration of the engine speed sensor voltage signal and the accelerator pedal 0 voltage signal received by the ECU controller is less than 5 minutes, and the exhaust gas temperature in the SCR is less than 200°C, the ECU controller looks up the table and inputs the corresponding voltage at the temperature to the wiring harness connector. The motor receives the voltage and drives the IAT closing valve to close. At the same time, the IAT valve position sensor detects the difference between the actual position and the required position of the closing valve, and feeds the difference back to the ECU controller in the form of a voltage signal through the wire. The ECU controller corrects the output voltage by looking up the table until the actual closing position of the IAT closing valve matches the theoretical position. When the ECU controller detects that the exhaust gas temperature in the SCR is greater than or equal to 200°C, the ECU controller inputs a voltage of 0 to the connector, and the IAT closing valve maintains the open position under the tension of the return spring.

[0013] In step 4: If the engine idle time is greater than or equal to 5 minutes, the ECU controller no longer processes the received SCR exhaust temperature voltage signal through the received engine speed sensor voltage signal and the accelerator pedal 0 voltage signal for a duration greater than or equal to 5 minutes, and the ECU controller does not input voltage to the wiring harness connector. At this time, the IAT closing valve is fully opened under the tension of the return spring.

[0014] The beneficial effects of the present invention are as follows: a low-oil-consumption IAT valve control system and control method for a diesel engine of the present invention overcomes the shortcomings of existing IAT valve control methods while meeting the requirements of diesel engine emission regulations, can effectively reduce the oil consumption rate under high-occupancy idle conditions of the engine, and meet the requirements of long oil change cycles of the engine. It is particularly suitable for applications such as commercial port tractors, cement mixers, and hazardous chemical vehicles, and has good prospects for market promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural schematic diagram of the diesel engine low fuel consumption IAT valve control system of the present invention.

[0016] In the figure: 1. Flywheel, 2. Accelerator pedal, 3. Accelerator pedal position sensor, 4. Engine speed sensor, 5. IAT valve actuator, 6. Wiring harness connector, 7. Motor, 8. Return spring, 9. IAT closing valve, 10. IAT valve position sensor, 11. ECU controller, 12. Power supply, 13. SCR temperature sensor, 14. SCR engine exhaust processor. DETAILED DESCRIPTION

[0017] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0018] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0019] Example 1 like Figure 1 As shown, a low-fuel-consumption IAT valve control system for a diesel engine of the present invention includes an ECU controller 11 and an IAT valve actuator 5. The IAT valve actuator 5 is composed of a wiring harness connector 6, a motor 7, a return spring 8, an IAT closing valve 9, and an IAT valve position sensor 10. The input end of the ECU controller 11 is connected to the accelerator pedal position sensor 3, the speed sensor 4, the SCR temperature sensor 13, and the IAT valve position sensor 10. The ECU controller 11 is electrically connected to the wiring harness connector 6, and the wiring harness connector 6 is electrically connected to the motor 7 and the IAT valve position sensor 10 respectively. The driving end of the motor 7 is connected to the IAT closing valve 9, and the return spring 8 is connected to the IAT closing valve 9.

[0020] The flywheel 1 is an engine energy storage component fixed to the engine crankshaft and is typically used to measure engine speed. The accelerator pedal 2. The accelerator pedal position sensor 3 senses the position of the accelerator pedal pressed by the driver, outputs a corresponding voltage signal, and feeds it back to the ECU controller 11. The IAT valve actuator 5 internally integrates a wiring harness connector 6, an electric motor 7, a return spring 8, an IAT closing valve 9, and an IAT valve position sensor 10. The wiring harness connector 6 is used to circulate voltage signals. The motor 7, whose shaft end is connected to the IAT closing valve 9, receives the voltage on the connector 6 and drives the closing of the IAT closing valve 9. The return spring 8 is used to reset the IAT closing valve 9. The IAT closing valve 9 is used to partially close the intake passage, limit the intake flow rate, and increase the exhaust temperature. The IAT valve position sensor 10 is used to measure the position of the IAT closing valve 9 and convert the valve position value into a voltage signal, which is input to the ECU controller 11. The ECU controller 11 receives voltage signals from the speed sensor 4, throttle position sensor 3, SCR temperature sensor 13, and IAT valve position sensor 10. Based on internally stored data tables, it outputs voltage to the wiring harness connector 6. The positive voltage supply 12 provides power to the ECU controller 11. The temperature sensor 13 senses the SCR temperature, converts it into a voltage signal, and feeds it back to the ECU controller 11. The SCR engine exhaust processor 14 converts harmful nitrogen oxides in the engine exhaust into harmless nitrogen and water. The engine speed sensor 4 monitors the engine speed and converts different speed values into corresponding voltage signals, which are fed back to the ECU controller 11.

[0021] The present invention provides a low-fuel-consumption IAT valve control system for a diesel engine, and its operating principle is as follows: an engine speed sensor 4 receives the speed of a flywheel 1 and provides a voltage signal corresponding to the flywheel speed to an ECU controller 11 via a wire; an accelerator pedal position sensor 3 converts the throttle position into a voltage signal and provides it to the ECU controller 11 via a wire; an SCR temperature sensor converts the exhaust temperature signal into a voltage signal and provides it to the ECU controller 11 via a wire; the ECU controller 11 looks up a table based on the engine speed sensor voltage signal, the throttle position voltage signal, and the SCR exhaust gas temperature voltage signal to determine whether a voltage needs to be provided to the IAT valve actuator 5. Typically, the output voltage of the ECU controller 11 is 0V-5V, where 0V indicates that the IAT shut-off valve 9 is fully open, 5V indicates that the IAT shut-off valve 9 is fully closed, and a voltage between 0V and 5V indicates that the IAT shut-off valve 9 is partially closed. If the engine idle time (generally 600rpm) is less than 5 minutes, the ECU controller 11 receives the engine speed sensor voltage signal and the accelerator pedal 0 voltage signal for less than 5 minutes, and the SCR temperature is less than 200°C, the ECU controller 11 looks up the table and inputs the corresponding voltage at the temperature to the wiring harness connector 6. The motor 7 receives the voltage and drives the IAT closing valve to close. At the same time, the IAT valve position sensor detects the difference between the actual position and the required position of the closing valve, and feeds the difference back to the ECU controller 11 through the wire in the form of a voltage signal. The ECU controller 11 corrects the output voltage by looking up the table until the actual closing position of the IAT closing valve matches the theoretical position. When the ECU controller 11 detects that the SCR temperature is greater than or equal to 200°C, the ECU controller 11 inputs a voltage of 0 to the connector 6, and the IAT closing valve maintains the open position under the pull of the return spring. If the engine idles for 5 minutes or longer, the ECU controller 11, receiving the engine speed sensor voltage signal and the accelerator pedal zero voltage signal for 5 minutes or longer, stops processing the SCR exhaust temperature voltage signal. The ECU controller 11 then inputs no voltage to the wiring harness connector 6. At this point, the IAT shutoff valve 9, pulled by the return spring 8, fully opens, allowing air to flow smoothly through the IAT valve. This maximizes engine intake flow, and the intake pressure exceeds the crankcase pressure, resulting in a positive pressure differential. This significantly reduces the likelihood of piston rings pumping oil into the cylinder during engine idle conditions, thereby reducing oil consumption. Engine testing has shown that under the same operating conditions, the new IAT valve control method reduces oil consumption from 1.5‰ to 0.4‰, meeting the standard requirement of 0.5‰. Despite a slight decrease in SCR exhaust temperature under these conditions, exhaust emissions still meet regulatory requirements.

[0022] Example 2 like Figure 1As shown, different from Example 1, in Example 2 of the present invention, in a diesel engine low fuel consumption IAT valve control system, the motor 7 is preferably a stepper motor to facilitate precise forward and reverse control.

[0023] Example 3 like Figure 1 As shown, a diesel engine low fuel consumption IAT valve control method of the present invention is specifically implemented according to the following steps: Step 1: The engine speed sensor 4 receives the speed of the flywheel 1 and provides the voltage signal corresponding to the flywheel speed to the ECU controller 11 through a wire. Step 2: The accelerator pedal position sensor 3 converts the accelerator position into a voltage signal and provides it to the ECU controller 11 through a wire. Step 3: The SCR temperature sensor 13 converts the exhaust temperature signal into a voltage signal and provides it to the ECU controller 11 through a wire; In step 4, the ECU controller 11 looks up a table based on the engine speed sensor voltage signal, the throttle position voltage signal, and the SCR exhaust gas temperature voltage signal to determine whether voltage needs to be provided to the IAT valve actuator 5 .

[0024] Example 4 like Figure 1 As shown, different from Example 3, in Example 4 of the present invention, in step 4 of a low fuel consumption IAT valve control method for a diesel engine: the output voltage of the ECU controller 11 is 0V-5V, wherein: 0V indicates that the IAT closing valve 9 is fully open; 5V indicates that the IAT closing valve 9 is fully closed; and between 0V-5V indicates that the IAT closing valve 9 is partially closed.

[0025] Example 5 like Figure 1 As shown, different from Example 4, in Example 5, in step 4 of a low-fuel-consumption IAT valve control method for a diesel engine according to the present invention: if the engine idling time is less than 5 minutes, the duration of the received engine speed sensor voltage signal and the accelerator pedal 0 voltage signal is less than 5 minutes, and the SCR temperature is less than 200°C, the ECU controller 11 looks up the table and inputs the corresponding voltage at the temperature to the wiring harness connector 6. The motor 7 receives the voltage and drives the IAT closing valve 9 to close. At the same time, the IAT valve position sensor 1 detects the difference between the actual closing valve position and the required position, and feeds the difference back to the ECU controller 11 in the form of a voltage signal through a wire. The ECU controller 11 corrects the output voltage by looking up the table until the actual closing position of the IAT closing valve 9 matches the theoretical position. When the ECU controller 11 detects that the SCR temperature is greater than or equal to 200°C, the ECU controller 11 inputs a voltage of 0 to the connector 6. The IAT closing valve 9 maintains its open position under the tension of the return spring 8.

[0026] Example 6 like Figure 1 As shown, Different from Example 5, in Example 6, in step 4 of a low-fuel-consumption IAT valve control method for a diesel engine of the present invention: if the engine idling time is greater than or equal to 5 minutes, the ECU controller 11 no longer processes the received SCR exhaust temperature voltage signal through the received engine speed sensor voltage signal and the accelerator pedal 0 voltage signal for a duration greater than or equal to 5 minutes, and the ECU controller 11 does not input voltage to the wiring harness connector 6. At this time, the IAT closing valve 9 is fully opened under the tension of the return spring 8, and air can flow smoothly through the IAT valve. At this time, the engine intake flow is the largest, the intake pressure is greater than the crankcase pressure, and the pressure difference is positive, which greatly reduces the probability of the piston ring pumping oil into the cylinder under the engine idling condition, thereby reducing engine oil consumption.

[0027] Engine testing has shown that, under the same operating conditions, the new IAT valve control method reduces oil consumption from 1.5‰ to 0.4‰, meeting the 0.5‰ standard. Although the SCR exhaust temperature is slightly lowered under these conditions, exhaust emissions still meet regulatory requirements.

[0028] The foregoing description shows and describes several preferred embodiments of the invention. However, as previously stated, it should be understood that the invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the invention is applicable to various other combinations, modifications, and environments and is capable of modification within the scope of the inventive concept described herein, through the teachings above, or through techniques or knowledge in the relevant art. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims

1. The diesel engine low fuel consumption IAT valve control system is characterized by: The invention comprises an ECU controller (11) and an IAT valve actuator (5), wherein the IAT valve actuator (5) is composed of a wiring harness connector (6), a motor (7), an IAT closing valve (9) and an IAT valve position sensor (10); an input end of the ECU controller (11) is connected to an accelerator pedal position sensor (3), a speed sensor (4), an SCR temperature sensor (13) and an IAT valve position sensor (10); the ECU controller (11) is electrically connected to the wiring harness connector (6), the wiring harness connector (6) is electrically connected to the motor (7) and the IAT valve position sensor (10), and a driving end of the motor (7) is connected to the IAT closing valve (9).

2. The diesel engine low fuel consumption IAT valve control system according to claim 1, characterized in that: The motor (7) is a stepping motor.

3. The diesel engine low fuel consumption IAT valve control system according to claim 2, characterized in that: The IAT valve actuator (5) further comprises a return spring (8), which is connected to the IAT closing valve (9).

4. The diesel engine low fuel consumption IAT valve control system according to claim 3, characterized in that: The ECU controller (11) is connected to a power source (12).

5. A diesel engine low fuel consumption IAT valve control method, characterized in that: Please follow the steps below to implement: Step 1: The engine speed sensor (4) receives the speed of the flywheel (1) and provides a voltage signal corresponding to the flywheel speed to the ECU controller (11) through a wire. Step 2: The accelerator pedal position sensor (3) converts the accelerator position into a voltage signal and provides it to the ECU controller (11) through a wire. Step 3: The SCR temperature sensor (13) converts the exhaust temperature signal into a voltage signal and provides it to the ECU controller (11) through a wire. In step 4, the ECU controller (11) checks the table based on the engine speed sensor voltage signal, the throttle position voltage signal and the SCR exhaust gas temperature voltage signal to determine whether voltage needs to be provided to the IAT valve actuator (5).

6. The diesel engine low fuel consumption IAT valve control method according to claim 5, characterized in that: In step 4: the ECU controller (11) outputs a voltage of 0V-5V, wherein: 0V indicates that the IAT shutoff valve (9) is fully open; 5V indicates that the IAT shutoff valve (9) is fully closed; and between 0V-5V indicates that the IAT shutoff valve (9) is partially closed.

7. The diesel engine low fuel consumption IAT valve control method according to claim 6, characterized in that: In step 4: if the engine idle time is less than 5 minutes, the ECU controller (11) receives the engine speed sensor voltage signal and the accelerator pedal 0 voltage signal for a duration of less than 5 minutes, and the SCR temperature is less than 200°C, the ECU controller (11) looks up the table and inputs the corresponding voltage at the temperature to the wiring harness connector (6), the motor (7) receives the voltage and drives the IAT closing valve (9) to close, and at the same time the IAT valve position sensor (10) detects the difference between the actual position and the required position of the closing valve, and feeds the difference back to the ECU controller (11) through the wire in the form of a voltage signal, the ECU controller (11) corrects the output voltage by looking up the table until the actual closing position of the IAT closing valve (9) and the theoretical position are consistent, when the ECU controller (11) detects that the SCR temperature is greater than or equal to 200°C, the ECU controller (11) inputs a voltage of 0 to the connector (6), and the IAT closing valve (9) maintains the open position under the tension of the return spring (8).

8. The diesel engine low fuel consumption IAT valve control method according to claim 6, characterized in that: In step 4: if the engine idle time is greater than or equal to 5 minutes, the ECU controller (11) no longer processes the received SCR exhaust temperature voltage signal through the received engine speed sensor voltage signal and the accelerator pedal 0 voltage signal for a duration greater than or equal to 5 minutes, and the ECU controller (11) does not input voltage to the wiring harness connector (6). At this time, the IAT closing valve (9) is fully opened under the pulling force of the return spring (8).

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