A BDC motor driven EGR valve controller

Abstract

The utility model discloses an EGR valve controller of BDC motor drive relates to the automobile motor control technical field, including the sensor input signal processing unit, main control unit and direct current brush EGR valve control unit that connect gradually. Sensor input signal processing unit gathers and handles the signal of accelerator, rotating speed and water temperature sensor, and the main control unit generates pulse control signal according to the signal after processing, and finally by drive unit control direct current brush motor EGR valve execution action. The utility model can accurately control the working condition of EGR valve, effectively reduce pollutant emission, and have on -line test, performance monitoring and fault diagnosis function, can store trouble code to make fast investigation problem, improved the reliability and maintenance efficiency of system.

Description

Technical Field

[0001] This utility model relates to the field of motor control technology, specifically to an EGR valve controller driven by a BDC motor. Background Technology

[0002] With increasingly stringent vehicle emission regulations, the Exhaust Gas Recirculation (EGR) system, a core technology for reducing nitrogen oxide emissions, faces higher demands on the control precision and reliability of its actuator, the EGR valve. DC brushed motors, with their advantages of low cost and simple drive circuitry, continue to hold an important position in the EGR valve actuation field.

[0003] However, existing technical solutions have systemic flaws. The control strategy lacks intelligence and the function of testing and monitoring the performance of the EGR valve is absent. These problems result in the inability to effectively control and provide real-time feedback on the operating status of the DC brushed EGR valve in the vehicle system. Summary of the Invention

[0004] Therefore, this utility model provides a BDC motor driven EGR valve controller to solve the technical problems of the lack of testing and performance monitoring functions for EGR valves and insufficient intelligence of control strategies in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] According to a first aspect of the present invention, a BDC motor driven EGR valve controller is provided, comprising a sensor input signal processing unit, a main control unit, and a DC brushed EGR valve control unit connected in sequence.

[0007] The sensor input signal processing unit is used to collect signals from the throttle sensor, speed sensor, and water temperature sensor, and to process the signals.

[0008] The main control unit is used to generate pulse control signals based on the signals transmitted by the sensor input signal processing unit and send them to the DC brushed EGR valve control unit.

[0009] The DC brushed EGR valve control unit is used to receive pulse control signals from the main control unit and drive the DC brushed motor EGR valve to perform corresponding actions.

[0010] Furthermore, the sensor input signal processing unit includes a throttle signal processing circuit, a speed signal processing circuit, and a water temperature signal processing circuit arranged in parallel.

[0011] Furthermore, the output terminals of the throttle signal processing circuit, the speed signal processing circuit, and the water temperature signal processing circuit are respectively connected to the signal input terminal of the main control unit.

[0012] Furthermore, the main chip of the main control unit is a microcontroller.

[0013] Furthermore, the microcontroller integrates an LDO linear regulator, a communication interface, and a 5V power output pin.

[0014] Furthermore, the LDO power input terminal of the microcontroller is connected to the car battery through a filter circuit and a protection circuit.

[0015] Furthermore, the main chip of the DC brushed EGR valve control unit is a DC brushed motor drive chip.

[0016] Furthermore, the control input terminal of the DC brushed motor driver chip is connected to the output terminal of the main control unit, and the signal feedback output terminal of the DC brushed motor driver chip is connected to the feedback signal input terminal of the main control unit.

[0017] Furthermore, the main control unit includes a fault diagnosis module, the input of which is connected to the signal feedback output of the DC brushed motor drive chip, for receiving motor operating parameters, and the internal memory of the main control unit pre-stores a fault code table.

[0018] Furthermore, the main control unit is equipped with a PWM signal output pin, which is connected to the control input terminal of the DC brushed motor driver chip. The opening degree of the EGR valve is controlled by outputting pulse control signals with different duty cycles.

[0019] The present invention has the following advantages:

[0020] This utility model relates to the field of automotive motor control technology, and includes a sensor input signal processing unit, a main control unit, and a DC brushed EGR valve control unit connected in sequence. The sensor input signal processing unit collects and processes signals from throttle, speed, and coolant temperature sensors. The main control unit generates pulse control signals based on the processed signals, which are ultimately controlled by the drive unit to execute actions on the DC brushed motor EGR valve. This utility model can precisely control the working state of the EGR valve, effectively reduce pollutant emissions, and has online testing, performance monitoring, and fault diagnosis functions. It can store fault codes for quick problem troubleshooting, improving system reliability and maintenance efficiency. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0023] Figure 1 A schematic diagram of the logic structure of a BDC motor-driven EGR valve controller provided for an embodiment of this utility model;

[0024] Figure 2 A circuit diagram of the main control unit in a BDC motor-driven EGR valve controller provided for an embodiment of this utility model;

[0025] Figure 3 A circuit diagram of a DC brushed EGR valve control unit in a BDC motor driven EGR valve controller provided for an embodiment of this utility model.

[0026] Figure 4 This is a circuit diagram of the sensor input signal processing unit in a BDC motor-driven EGR valve controller provided for an embodiment of the present invention. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] With increasingly stringent automotive emission regulations, the Exhaust Gas Recirculation (EGR) system, as a core technology for reducing nitrogen oxide (NOx) emissions, faces higher demands on the control precision and reliability of its actuator, the EGR valve. While brushed DC motors still hold an important position in EGR valve actuation due to their low cost and simple drive circuitry, existing technologies suffer from the following systemic shortcomings: insufficient intelligence in control strategies and a lack of testing and performance monitoring functions for the EGR valve. Therefore, there is an urgent need for a controller capable of controlling the operating status of the entire vehicle's brushed DC EGR valves, as well as conducting performance testing and monitoring.

[0029] To address the aforementioned technical issues of lacking testing and performance monitoring functions for EGR valves and insufficient intelligence in control strategies.

[0030] refer to Figure 1 This utility model discloses a BDC motor-driven EGR valve controller, comprising a sensor input signal processing unit, a main control unit, and a DC brushed EGR valve control unit connected in sequence. The sensor input signal processing unit is used to collect signals from the throttle sensor, speed sensor, and water temperature acquisition card, and process them into signals that the main control unit can recognize. The main control unit sends a pulse control signal to the DC brushed EGR valve control unit based on the signal transmitted by the sensor input signal processing unit. The DC brushed EGR valve control unit receives the pulse control signal sent by the main control unit and controls the DC brushed EGR valve to operate accordingly.

[0031] The aforementioned DC brushed EGR valve controller includes a sensor input signal processing unit comprising a throttle signal processing circuit, a speed signal processing circuit, and a water temperature signal processing circuit arranged in parallel. The output terminals of each of these processing circuits are respectively connected to the signal input terminals of a microcontroller.

[0032] The aforementioned DC brushed EGR valve controller uses a microcontroller with built-in LDO, communication, and 5V power output functions as its main control unit. The LDO power supply terminal of the microcontroller is connected to the car battery via a filtering and protection circuit. The signal input terminal of the microcontroller is connected to the output terminal of the sensor input signal processing unit. The microcontroller is also interconnected with the DC brushed EGR valve control unit.

[0033] The aforementioned DC brushed EGR valve controller has a main chip that is a DC brushed motor driver chip. The controlled terminal of the DC brushed driver chip is connected to the output terminal of the microcontroller, the signal feedback terminal of the DC brushed driver chip is connected to the signal receiving terminal of the microcontroller, and the output terminal of the DC brushed driver chip is connected to the controlled terminal of the DC brushed EGR valve.

[0034] This utility model embodiment is used for the control of DC brushed EGR valves in automobiles or engineering vehicles. This controller can control the working status of the DC brushed EGR valve of the whole vehicle, reducing pollutant emissions. At the same time, it can also test the DC brushed motor EGR valve, monitor various performance of the EGR valve, and enable technicians to quickly find out the fault of the DC brushed EGR valve by storing fault codes internally.

[0035] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A BDC motor-driven EGR valve controller, characterized in that, It includes a sensor input signal processing unit, a main control unit, and a DC brushed EGR valve control unit connected in sequence; The sensor input signal processing unit is used to collect signals from the throttle sensor, speed sensor, and water temperature sensor, and to process the signals. The main control unit is used to generate pulse control signals based on the signals transmitted by the sensor input signal processing unit and send them to the DC brushed EGR valve control unit. The DC brushed EGR valve control unit is used to receive pulse control signals from the main control unit and drive the DC brushed motor EGR valve to perform corresponding actions.

2. The BDC motor-driven EGR valve controller as described in claim 1, characterized in that, The sensor input signal processing unit includes a throttle signal processing circuit, a speed signal processing circuit, and a water temperature signal processing circuit arranged in parallel.

3. The BDC motor-driven EGR valve controller as described in claim 2, characterized in that, The output terminals of the throttle signal processing circuit, the speed signal processing circuit, and the water temperature signal processing circuit are respectively connected to the signal input terminal of the main control unit.

4. The BDC motor-driven EGR valve controller as described in claim 1, characterized in that, The main chip of the main control unit is a microcontroller.

5. A BDC motor-driven EGR valve controller as described in claim 4, characterized in that, The microcontroller integrates an LDO linear regulator, a communication interface, and a 5V power output pin.

6. A BDC motor-driven EGR valve controller as described in claim 5, characterized in that, The LDO power input terminal of the microcontroller is connected to the car battery through a filter circuit and a protection circuit.

7. A BDC motor-driven EGR valve controller as described in claim 1, characterized in that, The main chip of the DC brushed EGR valve control unit is a DC brushed motor drive chip.

8. A BDC motor-driven EGR valve controller as described in claim 7, characterized in that, The control input terminal of the DC brushed motor driver chip is connected to the output terminal of the main control unit, and the signal feedback output terminal of the DC brushed motor driver chip is connected to the feedback signal input terminal of the main control unit.

9. A BDC motor-driven EGR valve controller as described in claim 1, characterized in that, The main control unit includes a fault diagnosis module. The input terminal of the fault diagnosis module is connected to the signal feedback output terminal of the DC brushed motor drive chip to receive motor operating parameters. The internal memory of the main control unit stores a fault code table.

10. A BDC motor-driven EGR valve controller as described in claim 1, characterized in that, The main control unit is equipped with a PWM signal output pin, which is connected to the control input terminal of the DC brushed motor driver chip. The opening degree of the EGR valve is controlled by outputting pulse control signals with different duty cycles.

Images