A multifunctional post-processing gas sensor

Abstract

The present invention discloses a multifunctional post-processing gas sensor, including a sensor control unit and a sensor sensing unit, wherein the sensor control unit includes an MCU, an EMC module, a temperature sampling module, a pump unit current detection module, and an IDE current sampling module; the sensor sensing unit includes a pump unit, a heater, and an IDE; the EMC module is connected to the MCU via a CAN driver module, the MCU is connected to a PCBA ambient temperature detection circuit, the MCU is connected to a pump unit current detection, and the pump unit current detection is connected to the pump unit; the MCU is connected to a temperature sampling module, the temperature sampling module is connected to a heater, the MCU is connected to an IED current sampling module, and the IED current sampling module is connected to an IDE; the MUC is connected to an ECU. The present invention realizes the functional integration of a nitrogen oxide sensor and a particulate matter sensor, and reduces the ECU resource occupation; during the product production process, the controller and the sensor can be set as two independent standard parts, and subsequent production, replacement and maintenance are simple.

Description

Technical Field

[0001] The invention relates to the technical field of gas sensors, in particular to a multifunctional post-processing gas sensor. Background Art

[0002] With increasingly stringent environmental regulations, automobile exhaust emission control has become an important issue for automobile manufacturers. Currently, diesel vehicle exhaust treatment systems in the market mainly rely on separate nitrogen oxide sensors and particulate matter sensors to achieve emission control. However, the existing technology has the following defects: the large number of sensors and complex installation lead to numerous wiring harnesses and an increase in the number of parts, making the post-processing system structure complex; the high cost of a single sensor increases the overall cost of the vehicle; data transmission and processing between sensors require more ECU resources, affecting the overall performance of the vehicle. Each sensor has a single function and cannot work together, reducing the overall efficiency of the system.

[0003] At present, diesel vehicle aftertreatment systems generally use separate nitrogen oxide sensors and particulate matter sensors to meet strict emission standards such as National VI and Euro VI. These sensors are usually produced by different manufacturers, are expensive and complex to install. Each sensor needs to be installed independently, which increases the number of wiring harnesses and components, making the aftertreatment system more complicated, which not only increases costs but also affects the lightweight design of the vehicle. In addition, the presence of multiple sensors also increases the system's failure points and maintenance difficulty, reducing the overall reliability and stability of the system.

[0004] To this end, a multifunctional post-processing gas sensor is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional after-treatment gas sensor to solve the problems of large number of sensors, high cost, complex installation and the like in the prior art, and to provide a multifunctional after-treatment gas sensor to realize synchronous detection of nitrogen oxide concentration, oxygen concentration, particulate matter concentration and exhaust temperature, simplify the structure of the after-treatment system, reduce costs, realize closed-loop detection of nitrogen oxide concentration of the SCR system and closed-loop control of particulate matter emission of the DPF, provide accurate data support for the engine ECU, ensure the effective operation of the exhaust purification device, reduce system costs by reducing the number of sensors and the complexity of the wiring harness, and improve the lightweight and overall performance of the vehicle.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multifunctional post-processing gas sensor, comprising a sensor control unit and a sensor sensing unit, wherein the sensor control unit comprises an MCU, an EMC module, a temperature sampling module, a pump unit current detection module, and an IDE current sampling module;

[0008] The sensor sensing unit includes a pump unit, a heater, and an IDE;

[0009] The EMC module is connected to the MCU via a CAN driver module, the MCU is connected to the PCBA ambient temperature detection circuit, the MCU is connected to the pump unit current detection, and the pump unit current detection is connected to the pump unit;

[0010] The MCU is connected to a temperature sampling module, the temperature sampling module is connected to a heater, the MCU is connected to an IED current sampling module, and the IED current sampling module is connected to an IDE;

[0011] The MUC is connected to the ECU.

[0012] Furthermore, the EMC module is connected to the B+ terminal and GND.

[0013] Furthermore, the EMC module is connected to an overvoltage protection module.

[0014] Further, the voltage protection module is connected to a 24 / 12VDC-DC module, the 24 / 12VDC-DC module is connected to an IDE power supply module, and the IDE power supply module is connected to the IDE.

[0015] Furthermore, the 24 / 12VDC-DC module is connected to the 12 / 5VDC-DC module, and the 12 / 5VDC-DC module is connected to the MCU.

[0016] Furthermore, the 12 / 5VDC-DC module is connected to the heating module for power supply.

[0017] Furthermore, the heating module is powered and connected to a heater.

[0018] Further, the 12 / 5VDC-DC module is connected to the pump unit power supply, and the pump unit power supply is connected to the pump unit.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] Realize the functional integration of nitrogen oxide sensor and particulate matter sensor to reduce ECU resource usage;

[0021] During the product production process, the controller and sensor can be set as two independent standard parts, which simplifies subsequent production, replacement and maintenance, and reduces user costs;

[0022] Reduce the number of sensors, reduce costs, simplify the post-processing system structure, and reduce vehicle weight;

[0023] It realizes comprehensive monitoring of nitrogen oxide concentration, oxygen concentration, particulate matter concentration and exhaust temperature, and improves the closed-loop control accuracy of the post-treatment system. It improves the response speed of the sensor and the accuracy of the data, and optimizes the calibration process of the engine ECU;

[0024] Through integrated design, wiring harnesses and components are reduced, and the reliability and durability of the system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a control timing diagram of the present invention;

[0026] Figure 2 It is a schematic block diagram of the controller structure of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] Embodiment 1:

[0029] See also Figure 1-2 , the present invention provides a technical solution:

[0030] A multifunctional post-processing gas sensor, comprising a sensor control unit and a sensor sensing unit, wherein the sensor control unit comprises an MCU, an EMC module, a temperature sampling module, a pump unit current detection module, and an IDE current sampling module;

[0031] The sensor sensing unit includes a pump unit, a heater, and an IDE;

[0032] The EMC module is connected to the MCU through the CAN driver module, the MCU is connected to the PCBA ambient temperature detection circuit, the MCU is connected to the pump unit current detection, and the pump unit current detection is connected to the pump unit;

[0033] MCU is connected to the temperature sampling module, the temperature sampling module is connected to the heater, MCU is connected to the IED current sampling module, the IED current sampling module is connected to IDE, MUC is connected to ECU, the EMC module is connected to the B+ terminal and GND, the EMC module is connected to the overvoltage protection module, the overvoltage protection module is connected to the 24 / 12VDC-DC module, the 24 / 12VDC-DC module is connected to the IDE power supply module, the IDE power supply module is connected to IDE, the 24 / 12VDC-DC module is connected to the 12 / 5VDC-DC module, the 12 / 5VDC-DC module is connected to the MCU, the 12 / 5VDC-DC module is connected to the heating module power supply, the heating module power supply is connected to the heater, the 12 / 5VDC-DC module is connected to the pump unit power supply, and the pump unit power supply is connected to the pump unit.

[0034] Working principle:

[0035] When the sensor is powered on and does not receive the dew point start command, it starts preheating to protect the ceramic core, heating from room temperature to 200°C, once every one minute;

[0036] After the sensor is powered on, it receives the start command for detecting the nitrogen and oxygen dew point. The ceramic core starts to heat to 200°C, maintains for 5 seconds, heats to 400°C, maintains for 5 seconds to 800°C, and stabilizes at 800°C. The oxygen concentration and nitrogen and oxygen concentration in the current exhaust gas are detected according to the oxygen characteristics of the zirconium oxide pump.

[0037] f) After detecting nitrogen and oxygen, the ceramic core receives the start command for detecting the dew point of particulate matter. The ceramic core starts to maintain heating at 800°C for 20 seconds and then stops heating. The ceramic core starts to feedback the current ceramic core temperature in real time. When the heat is dissipated to 400°C, the current of the particle attachment circuit is detected;

[0038] After the sensor is powered on, it receives the start command for detecting the dew point of particulate matter. The ceramic core starts to heat to 200°C, maintains for 5 seconds, heats to 400°C, maintains for 5 seconds to 800°C, and stops heating after maintaining at 800°C for 30 seconds. The ceramic core starts to feedback the current ceramic core temperature in real time, and detects the current of the particle attachment circuit when the heat is dissipated to 400°C.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional post-processing gas sensor, comprising a sensor control unit and a sensor sensing unit, characterized in that: The sensor control unit includes an MCU, an EMC module, a temperature sampling module, a pump unit current detection module, and an IDE current sampling module; The sensor sensing unit includes a pump unit, a heater, and an IDE; The EMC module is connected to the MCU via a CAN driver module, the MCU is connected to the PCBA ambient temperature detection circuit, the MCU is connected to the pump unit current detection, and the pump unit current detection is connected to the pump unit; The MCU is connected to a temperature sampling module, the temperature sampling module is connected to a heater, the MCU is connected to an IED current sampling module, and the IED current sampling module is connected to an IDE; The MUC is connected to the ECU.

2. A multifunctional post-processing gas sensor according to claim 1, characterized in that: The EMC module is connected to the B+ terminal and GND.

3. A multifunctional post-processing gas sensor according to claim 1, characterized in that: The EMC module is connected to the overvoltage protection module.

4. The multifunctional post-processing gas sensor according to claim 1, characterized in that: The voltage protection module is connected to a 24 / 12VDC-DC module, the 24 / 12VDC-DC module is connected to an IDE power supply module, and the IDE power supply module is connected to an IDE.

5. A multifunctional post-processing gas sensor according to claim 4, characterized in that: The 24 / 12VDC-DC module is connected to the 12 / 5VDC-DC module, and the 12 / 5VDC-DC module is connected to the MCU.

6. A multifunctional post-processing gas sensor according to claim 5, characterized in that: The 12 / 5VDC-DC module is connected to the heating module for power supply.

7. A multifunctional post-processing gas sensor according to claim 6, characterized in that: The heating module is powered and connected to the heater.

8. The multifunctional post-processing gas sensor according to claim 5, characterized in that: The 12 / 5VDC-DC module is connected to the pump unit power supply, and the pump unit power supply is connected to the pump unit.

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