EGR valve controller based on SENT protocol output

Abstract

The utility model discloses an exhaust gas recirculation (EGR) valve controller based on SENT protocol output, which comprises a sliding mechanism arranged on an EGR valve, and the sliding mechanism is provided with magnetic steel used for changing the position along with the opening position of the EGR valve. The SENT sensor chip is parallel to the magnetic steel and used for detecting the magnetic field intensity of the magnetic steel, the power source is used for providing a power supply, the signal processing device is used for analyzing detected magnetic field signals, and the output end of the power source is connected with the power input end of the SENT sensor chip. And the output end of the SENT sensor chip is connected with the input end of the signal processing device. The magnetic field intensity of the magnetic steel is detected through the SENT sensor chip, rich information is analyzed through the SENT protocol, the information comprises position information used for controlling the opening degree of the EGR valve, temperature information and various fault diagnosis information, the control requirement of the EGR valve can be well met, and the device can be well matched with intelligentization of future automobiles.

Description

Technical Field

[0001] The utility model relates to the technical field of EGR valves, and more specifically to an EGR valve controller based on SENT protocol output. Background Art

[0002] The main function of the EGR valve is to send part of the exhaust gas discharged from the engine back to the intake manifold, control the amount of exhaust gas entering the intake manifold, and enter the cylinder again together with the fresh air-fuel mixture for recirculation, which can improve the engine working efficiency, improve the combustion environment, and effectively reduce the emission of NO compounds. The EGR valve plays a crucial role in the automotive exhaust gas recirculation.

[0003] With the development of automotive electrification and intelligence, the functions of automobiles are becoming more and more abundant, and the requirements for automotive electronic components are also getting higher and higher. Not only should the functional requirements be well achieved, but each component also needs to have a fault diagnosis function. As an important component in automotive exhaust gas recirculation, the controller of the EGR valve not only needs to achieve the purpose of accurately controlling the opening degree, but also needs to have the ability of fault diagnosis and be able to report various diagnostic information.

[0004] At present, many EGR valves only output simple voltage signals, which can only achieve the single function of controlling the opening degree and do not have the ability of fault diagnosis. When the EGR valve fails, it cannot be effectively diagnosed, which may bring more potential safety hazards to the vehicle. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide an EGR valve controller based on SENT protocol output to solve the problems in the background art.

[0006] To solve the above technical problems, the following technical solutions are adopted in the utility model.

[0007] An EGR valve controller based on SENT protocol output includes a sliding mechanism arranged on the EGR valve, and a magnet is arranged on the sliding mechanism and is used to change its position following the opening position of the EGR valve; the controller includes a SENT sensor chip arranged parallel to the magnet for detecting the magnetic field strength of the magnet, a power supply for providing the power supply, and a signal processing device for analyzing the detected magnetic field signal. The output end of the power supply is connected to the power input end of the SENT sensor chip, and the output end of the SENT sensor chip is connected to the input end of the signal processing device.

[0008] To further optimize the technical solution, the sliding mechanism includes a turntable arranged at the top of the valve stem inside the EGR valve, a turbine-shaped convex block is arranged on the rotating shaft of the turntable, a top block for abutting against the convex block is arranged at the top of the valve stem, a turbine-shaped chute is formed on the turntable, and the magnet is arranged in the chute.

[0009] Further optimize the technical solution. The SENT sensor chip is connected to the power supply through the input interface, and the SENT sensor chip is connected to the signal processing device through the output interface.

[0010] Further optimize the technical solution. The SENT sensor chip, the input interface, and the output interface are integrated on a PCB board.

[0011] Further optimize the technical solution. The gap between the permanent magnet and the SENT sensor chip is 2 mm.

[0012] Due to the adoption of the above technical solutions, the technical progress achieved by the present utility model is as follows.

[0013] An EGR valve controller based on SENT protocol output provided by the present utility model detects the magnetic field intensity of the permanent magnet through the SENT sensor chip, and parses out rich information through the SENT protocol, including not only the position information for controlling the opening degree of the EGR valve, but also temperature information and various fault diagnosis information, which can well meet the control requirements of the EGR valve and can also be well integrated with the intelligence of future vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the structural block diagram of the present utility model;

[0015] Figure 2 is the wiring connection schematic diagram of the present utility model;

[0016] Figure 3 is the structural schematic diagram of the sliding mechanism of the present utility model;

[0017] Figure 4 is the circuit diagram of the signal processing circuit of the present utility model;

[0018] Figure 5 is the structural schematic diagram of the single-frame output of the SENT signal of the present utility model;

[0019] Figure 6 is the SENT signal output schematic diagram of the present utility model.

[0020] Wherein: 1. valve stem, 2. turntable, 3. chute, 4. convex block, 5. top block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0022] An EGR valve controller based on SENT protocol output, in combination with Figures 1 to 2As shown in the figure, it includes a sliding mechanism and a SENT sensor chip. The sliding mechanism is arranged on the EGR valve, and a magnet is arranged on the sliding mechanism to change its position following the opening position of the EGR valve. The SENT sensor chip is arranged on the PCB board to detect the magnetic field intensity of the magnet.

[0023] The SENT sensor chip is connected to a power supply through an input interface to provide a power supply. The SENT sensor chip is connected to a signal processing device through an output interface to analyze the detected magnetic field signal. The output end of the power supply is connected to the power input end of the SENT sensor chip, and the output end of the SENT sensor chip is connected to the input end of the signal processing device. The SENT sensor chip, the input interface, and the output interface are integrated on a single PCB board.

[0024] The structure of the sliding mechanism is as Figure 3 shown in the figure, and it includes a turntable 2 arranged at the upper end of the valve stem 1. A turbine-shaped convex block 4 is arranged on the rotating shaft of the turntable 2. A top block 5 for abutting against the convex block is arranged at the top end of the valve stem 1. A chute 3 is opened on the turntable 2, and the chute has a turbine-shaped structure. A magnet 4 is slidably arranged in the chute 3. When the opening of the EGR valve changes, the valve stem moves up and down. Since the convex block abutted by the top block at the top end of the valve stem is of a turbine-shaped structure, the turntable rotates during the movement of the slider on the valve stem. The rotation of the turntable drives the magnet to move in the chute. Under the action of gravity, the magnet realizes up and down movement in the chute, and the magnet is parallel to the SENT sensor chip, maintaining a gap of 2 mm to facilitate the SENT sensor chip to detect the magnetic field intensity of the magnet.

[0025] After the SENT sensor chip is connected to an external power supply, it will automatically detect the magnetic field intensity. According to the different magnetic field intensities, it is converted into different SENT signals through internal processing of the chip. Finally, the signal processing device analyzes the SENT signals to calculate the opening size of the EGR valve and related diagnostic information. The circuit diagram of the signal processing device in the present utility model is as Figure 4 shown in the figure.

[0026] Using the Hall effect principle, when the sensor chip is powered on, there is current passing through the semiconductor material inside the chip. At this time, a magnetic field perpendicular to the current direction (the magnetic field generated by the magnet) is applied, and a potential difference will be generated on both sides of the semiconductor material of the chip. The sensor chip measures the change in magnetic flux density by detecting this potential difference, and thus converts it into different SENT signals for output. The single-frame output structure of the SENT signal is as Figure 5 shown in the figure.

[0027] Among them, the Signal1 data segment represents angle information with 12-bit data composed of Data1 to Data3. That is, the angle 0 to 360° can be represented by the digital quantity 0x000 to 0xFFF (0 to 4095). The sensor chip is pre-programmed according to the actual mechanical stroke of the EGR valve (the corresponding opening from fully open to fully closed is 0% to 100%). For example, the digital quantity 0x3E8 (1000) corresponds to 0% opening, and the digital quantity 0xFA0 (4000) corresponds to 100% opening. In the actual control process, by parsing the Signal1 data segment of different SENT signals, the opening information of the EGR valve can be converted.

[0028] The Signal2 data segment represents temperature information with 12-bit data composed of Data1 to Data3. That is, the temperature -40° to +160° can be represented by the digital quantity 0x000 to 0xFFF (0 to 4095). By parsing the Signal2 data segment of different SENT signals, the temperature information can be obtained.

[0029] The SENT signal output can be divided into two modes: fast channel and slow channel. The fast channel transmits a complete signal in each frame, such as opening information and temperature information; the slow channel requires 18 frames of data to transmit a complete signal in combination, which is completed by jointly combining bit3 and bit2 in the Status / Com status and communication fields. The schematic diagram of the SENT signal output is as Figure 6 shown.

[0030] Among them, the last 12-bit data segment composed of bit2 is used to represent fault information, which can be represented by the digital quantity 0x000 to 0xFFF. By parsing each combined data segment of 18 frames, the fault information of the EGR valve sensor can be obtained. The fault information list is shown in Table 1:

[0031] Table 1:

[0032] 12-bit data segment Fault description 0x800 No fault 0x801 Magnetic field signal regulation gain exceeds clamping 0x802 Field strength is lower than the set minimum threshold 0x804 Field strength is higher than the set maximum threshold 0x810 ADC conversion error 0x820 Overvoltage or undervoltage of analog signal voltage 0x840 Overvoltage or undervoltage of digital signal voltage 0x900 Excessive temperature 0xA00 DSP data overflow 0xC00 Current detection error

[0033] When the present utility model is actually used, the input interface is connected to the positive and negative poles of an external power supply to supply power to the SENT sensor chip. After the sensor chip is powered on, it will continuously and automatically detect the magnetic field intensity. When the EGR valve controls different opening sizes, the sliding mechanism will drive the magnet up and down, and the position of the magnet relative to the sensor chip changes, thereby generating different magnetic field intensities. The sensor chip detects different magnetic field intensities, converts them into different SENT signals through internal processing of the chip, and outputs them through the output interface. According to this output signal, the information contained in the SENT signal can be parsed through the SENT protocol, and the opening size of the EGR valve and various fault diagnosis information can be calculated.

Claims

1. An EGR valve controller based on SENT protocol output, characterized in that: It includes a sliding mechanism arranged on the EGR valve, and a magnet is arranged on the sliding mechanism and is used to change its position following the opening position of the EGR valve; the controller includes a SENT sensor chip arranged parallel to the magnet for detecting the magnetic field intensity of the magnet, a power supply for providing a power supply, and a signal processing device for analyzing the detected magnetic field signal. The output end of the power supply is connected to the power input end of the SENT sensor chip, and the output end of the SENT sensor chip is connected to the input end of the signal processing device.

2. The EGR valve controller based on SENT protocol output according to claim 1, characterized in that: The sliding mechanism includes a turntable (2) arranged at the top end of the valve stem (1) inside the EGR valve. A turbine-shaped convex block (4) is arranged on the rotating shaft of the turntable (2). A top block (5) for abutting against the convex block (4) is arranged at the top end of the valve stem (1). A turbine-shaped chute (3) is formed on the turntable (2), and the magnet is arranged in the chute (3).

3. An EGR valve controller based on SENT protocol output according to claim 1, characterized in that: The SENT sensor chip is connected to the power supply through an input interface, and the SENT sensor chip is connected to the signal processing device through an output interface.

4. An EGR valve controller based on SENT protocol output according to claim 2, characterized in that: The SENT sensor chip, the input interface, and the output interface are integrated on a PCB board.

5. An EGR valve controller based on SENT protocol output according to claim 1, characterized in that: The gap between the magnet and the SENT sensor chip is 2 mm.

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