Integrated diesel vehicle DPF diagnosis sensor and control system

Abstract

The integrated diesel vehicle DPF diagnosis sensor and control system comprises a DPF diagnosis sensor controller, and the air inlet end of the DPF diagnosis sensor controller is provided with a DPF front pressure collecting probe which converts pressure signals into electric signals and transmits the electric signals to the controller; a DPF rear pressure acquisition probe for converting a pressure signal into an electric signal and transmitting the electric signal to the controller is mounted at the exhaust end of the DPF diagnosis sensor controller; a particulate matter collecting probe for detecting the concentration of particulate matters in the tail gas treated by the DPF is mounted at the rear end of the DPF rear pressure collecting probe; and the DPF diagnosis sensor controller is connected with the ECU. The system has the advantages that the system is highly integrated, the differential pressure sensor and the particulate matter sensor are integrally designed, the number of the sensors is reduced, the system structure is simplified, and the cost is reduced; and real-time monitoring and accurate control are achieved, through integrated design, synchronous monitoring of the front and back pressure difference of the DPF and the concentration of particulate matter in tail gas is achieved, more comprehensive and accurate data support is provided for an ECU, and the strategy of DPF regeneration is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of automobile sensors, in particular to an integrated diesel vehicle DPF diagnostic sensor and a control system. Background Art

[0002] At present, the post-treatment system of diesel vehicles mainly includes diesel particulate filters (DPF), which are used to capture particulate matter in exhaust gas to reduce the impact of emissions on the environment. Common DPF monitoring technologies include: Pressure sensors: usually installed at the front and rear ends of the DPF, measuring the pressure difference between the two ends of the DPF. These pressure sensors can provide indirect information about the degree of DPF blockage, but are often sensitive to sensor failure or errors.

[0003] Particle sensor: used to directly measure the concentration of particulate matter after the DPF exhaust and monitor the performance of the filter. The measurement results of the particle sensor help determine the status of the DPF and emission compliance, but these sensors may be affected by environmental conditions.

[0004] At present, in the diesel vehicle aftertreatment system, the monitoring of the diesel particulate filter (DPF) mainly relies on independent differential pressure sensors and particle sensors, which are often designed, installed and maintained separately, which not only increases the complexity and cost of the system, but may also lead to synchronization and accuracy problems between monitoring data. The existing differential pressure sensor is mainly used to detect the pressure difference before and after the DPF to evaluate the accumulation of particulate matter, but lacks real-time correlation with direct concentration monitoring of particulate matter, resulting in the formulation of the "DPF regeneration" strategy may not be accurate enough. Although a separate particle sensor can detect the concentration of particulate matter in the exhaust gas, it often cannot directly reflect the filtration efficiency and performance status of the DPF, and is easily affected by environmental factors such as temperature and humidity. In addition, the existing system has a variety of data transmission methods and lacks a unified standardized interface, which increases the difficulty and cost of system integration.

[0005] Therefore, an integrated diesel vehicle DPF diagnostic sensor and control system is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide an integrated diesel vehicle DPF diagnostic sensor and control system. Through a highly integrated design, a differential pressure sensor and a particulate matter sensor are integrated into one, and combined with advanced controller technology, comprehensive, accurate and real-time monitoring of the DPF status is achieved. At the same time, the CAN bus is used as a unified data transmission interface to improve the efficiency and reliability of data transmission, and provide more accurate data support for the ECU, thereby optimizing the "DPF regeneration" strategy, improving the emission performance and fuel economy of diesel vehicles, and reducing maintenance costs.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An integrated diesel vehicle DPF diagnostic sensor and control system, including a DPF diagnostic sensor controller, wherein the DPF diagnostic sensor controller has a DPF front pressure acquisition probe installed at the air intake end thereof, which converts the pressure signal into an electrical signal and transmits it to the controller;

[0009] The exhaust end of the DPF diagnostic sensor controller is equipped with a DPF post-pressure acquisition probe that converts the pressure signal into an electrical signal and transmits it to the controller;

[0010] A particle collection probe is installed at the rear end of the DPF post-pressure collection probe to detect the particle concentration in the exhaust gas treated by the DPF;

[0011] The DPF diagnostic sensor controller is connected to the ECU.

[0012] Furthermore, the DPF diagnostic sensor controller has built-in reverse connection protection circuit, buck-boost circuit, overvoltage / undervoltage protection circuit, heating module drive circuit, particle attachment electrode current sampling circuit, voltage acquisition circuit, PCBA ambient temperature detection circuit, and CAN bus drive circuit.

[0013] Furthermore, the DPF diagnosis sensor controller is connected to the ECU via a CAN bus drive circuit.

[0014] Furthermore, the DPF diagnosis sensor controller is connected to the ECU via CAN_H and CAN_L.

[0015] Furthermore, the step-up and step-down circuit is composed of a DC-DC step-up circuit and a DC-DC step-down circuit.

[0016] Furthermore, the DC-DC boost circuit increases the power supply voltage to 45V.

[0017] Furthermore, the DC-DC step-down circuit reduces the power supply voltage to 5V.

[0018] Furthermore, the overvoltage protection circuit prevents the circuit from overvoltage > 40V.

[0019] Furthermore, the low voltage protection circuit prevents the circuit from under-voltage <9V.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Highly integrated: The differential pressure sensor and the particle sensor are integrated to reduce the number of sensors, simplify the system structure and reduce costs;

[0022] Real-time monitoring and precise control: Through integrated design, the pressure difference before and after the DPF and the concentration of exhaust particulate matter are monitored simultaneously, providing more comprehensive and accurate data support for the ECU and optimizing the formulation and execution of the "DPF regeneration" strategy;

[0023] Data transmission standardization: Using CAN bus as the data transmission interface improves the efficiency and reliability of data transmission and facilitates system integration and upgrade;

[0024] Enhanced system stability: The controller has built-in multiple protection circuits (such as reverse connection protection, overvoltage / low voltage protection, temperature detection, etc.) to ensure stable operation of the system under various working conditions;

[0025] Reduce maintenance costs: The integrated design reduces failure points, simplifies fault diagnosis and repair processes, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the 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 , the present invention provides a technical solution:

[0030] 1. An integrated diesel vehicle DPF diagnostic sensor and control system, including a DPF diagnostic sensor controller, characterized in that:

[0031] The DPF diagnostic sensor controller has a DPF front pressure acquisition probe installed at the air intake end, which converts the pressure signal into an electrical signal and transmits it to the controller;

[0032] The exhaust end of the DPF diagnostic sensor controller is equipped with a DPF post-pressure acquisition probe that converts the pressure signal into an electrical signal and transmits it to the controller;

[0033] A particle collection probe is installed at the rear end of the DPF post-pressure collection probe to detect the particle concentration in the exhaust gas treated by the DPF;

[0034] DPF diagnostic sensor controller connected to ECU;

[0035] The DPF diagnostic sensor controller has built-in reverse connection protection circuit, buck-boost circuit, overvoltage / undervoltage protection circuit, heating module drive circuit, particle attachment electrode current sampling circuit, voltage acquisition circuit, PCBA ambient temperature detection circuit, and CAN bus drive circuit.

[0036] like Figure 1 As shown:

[0037] The DPF diagnostic sensor controller is connected to the ECU via the CAN bus driver circuit.

[0038] like Figure 1 As shown:

[0039] The DPF diagnostic sensor controller is connected to the ECU via CAN_H and CAN_L.

[0040] like Figure 1 As shown:

[0041] The step-up and step-down circuit consists of a DC-DC step-up circuit and a DC-DC step-down circuit, wherein the DC-DC step-up circuit increases the power supply voltage to 45V, and the DC-DC step-down circuit reduces the power supply voltage to 5V.

[0042] like Figure 1 As shown:

[0043] The overvoltage protection circuit prevents the circuit from overvoltage>40V, and the undervoltage protection circuit prevents the circuit from undervoltage<9V.

[0044] Working principle:

[0045] Controller: core component, integrated with reverse connection protection circuit, DC-DC boost / buck circuit, overvoltage / low voltage protection circuit, heating module drive circuit, particle attachment electrode current sampling circuit, voltage acquisition circuit, PCBA ambient temperature detection circuit, CAN bus drive circuit and pressure sensor chip, etc. The controller is responsible for data processing, logic judgment and command output to ensure efficient operation of the system.

[0046] Pressure acquisition probes: Installed at the front and rear of the DPF, they are used to detect the pressure difference between the two ends of the DPF in real time, and convert the pressure signal into an electrical signal and transmit it to the controller. The controller determines the accumulation of particulate matter based on the pressure difference data, and then determines the triggering time of "DPF regeneration" and the amount of additional fuel injection.

[0047] Particle collection probe: Installed after the DPF post-pressure sensor, it is used to detect the particle concentration in the exhaust gas after DPF treatment. Combined with the exhaust temperature information, the particle concentration data is sent to the ECU via the CAN bus. The ECU determines whether the exhaust emissions meet the standards and whether the DPF is damaged or needs maintenance based on the particle concentration data.

[0048] The entire system communicates with the ECU via the CAN bus, achieving fast and accurate data transmission. The controller comprehensively determines the working status of the DPF based on the received data and provides the ECU with the optimal control strategy, thereby achieving effective management and optimization of diesel vehicle emission performance.

[0049] Integrated sensor system design: Integrates front-end and back-end pressure sensors, particulate matter sensors, and controllers into a single system, simplifying system design and installation.

[0050] Multi-function controller: The controller integrates reverse connection protection circuit, DC-DC boost and buck circuit, overvoltage and low voltage protection circuit, heating module drive circuit, particle attachment electrode current sampling circuit, voltage acquisition circuit, PCBA ambient temperature detection circuit and CAN bus drive circuit, etc., which improves the stability and reliability of the system.

[0051] Real-time data synchronization: Real-time data transmission and synchronous processing of pressure difference and particle concentration are achieved through the CAN bus, which improves the accuracy of monitoring and diagnosis.

[0052] Intelligent diagnosis and control: The ECU comprehensively determines the degree of DPF blockage based on sensor data, determines the timing of regeneration triggering and the amount of additional fuel injection, and also evaluates the DPF status and emission compliance.

[0053] Enhanced sensor protection: The heating module drive circuit and other protection circuits are designed to ensure the normal operation of the sensor under various environmental conditions and the long-term stability of the system.

[0054] 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. An integrated diesel vehicle DPF diagnostic sensor and control system, including a DPF diagnostic sensor controller, characterized in that: The DPF diagnostic sensor controller has a DPF front pressure acquisition probe installed at the air intake end, which converts the pressure signal into an electrical signal and transmits it to the controller; The exhaust end of the DPF diagnostic sensor controller is equipped with a DPF post-pressure acquisition probe that converts the pressure signal into an electrical signal and transmits it to the controller; A particle collection probe is installed at the rear end of the DPF post-pressure collection probe to detect the particle concentration in the exhaust gas treated by the DPF; The DPF diagnostic sensor controller is connected to the ECU.

2. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 1 is characterized in that: The DPF diagnostic sensor controller has built-in reverse connection protection circuit, buck-boost circuit, overvoltage / undervoltage protection circuit, heating module drive circuit, particle attachment electrode current sampling circuit, voltage acquisition circuit, PCBA ambient temperature detection circuit, and CAN bus drive circuit.

3. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 1 is characterized in that: The DPF diagnosis sensor controller is connected to the ECU via a CAN bus drive circuit.

4. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 3 is characterized in that: The DPF diagnosis sensor controller is connected to the ECU via CAN_H and CAN_L.

5. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 2 is characterized in that: The step-up and step-down circuit is composed of a DC-DC step-up circuit and a DC-DC step-down circuit.

6. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 5 is characterized in that: The DC-DC boost circuit boosts the power supply voltage to 45V.

7. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 5 is characterized in that: The DC-DC step-down circuit reduces the power supply voltage to 5V.

8. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 1, characterized in that: The overvoltage protection circuit prevents the circuit from overvoltage>40V.

9. The integrated diesel vehicle DPF diagnostic sensor and control system according to claim 1, characterized in that: The low voltage protection circuit prevents the circuit from under-voltage < 9V.

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