Dynamic performance testing device for nitrogen-oxygen sensor
By integrating diesel engines, hot air furnaces, power control switches and sensor signal acquisition systems, the inefficiency problem of dynamic performance testing of nitrogen oxygen sensors in the prior art is solved, and efficient and accurate testing is achieved to simulate vehicle operating conditions in the laboratory.
Patent Information
- Application Number
- CN202422247773.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-13
Smart Images
Figure CN223154975U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a nitrogen oxide sensor testing technology for vehicle exhaust gas detection, in particular to a dynamic performance testing device for nitrogen oxide sensors. Background Art
[0002] During the production process of nitrogen oxide (NOx) sensors, it is necessary to detect the measurement accuracy and dynamic response performance of NOx in the vehicle exhaust gas atmosphere. Since the pressure, temperature, flow rate, etc. of automobile exhaust gas change very rapidly, the same effect cannot be achieved by the gas distribution method and the gas distribution consumption is large and the cost is very high; if tested on a vehicle, only one sensor can be installed each time, and the testing efficiency is very low and batch detection cannot be carried out. In addition, although there are related technologies in the prior art that provide simulation of vehicle exhaust gas for nitrogen oxide sensors, the ability to perform dynamic performance testing of nitrogen oxide sensors under different gear loads of the vehicle cannot be provided.
[0003] It should be noted that the information disclosed in the above background art section is only used for understanding the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model
[0004] The main purpose of the present utility model is to solve the problems existing in the above background art, and provide a dynamic performance testing device for nitrogen oxide sensors.
[0005] To achieve the above purpose, the present utility model adopts the following technical solutions:
[0006] A dynamic performance testing device for nitrogen oxide sensors, comprising:
[0007] A diesel engine, which operates to provide exhaust gas for testing nitrogen oxide sensors;
[0008] An engine exhaust pipe, connected to the exhaust port of the diesel engine, for guiding the exhaust gas generated by the diesel engine and installed with a nitrogen oxide sensor;
[0009] A hot blast stove, comprising a resistive heater and a blower, the blower being used to dissipate the heat generated by the resistive heater into the air;
[0010] A power control switch, connected to the hot blast stove and a controller, comprising multiple groups of electrically controllable power switches, and adjusting the heating power of the hot blast stove by controlling the on-off of the switches to simulate the multi-gear load of the vehicle;
[0011] An alternator, connected to the power shaft of the diesel engine, outputting alternating current and supplying power to the hot blast stove through the power control switch;
[0012] A controller, connected to the diesel engine and the power control switch, is used to control the rotational speed of the diesel engine and the number of conduction channels of the power control switch to simulate different working conditions of the vehicle.
[0013] A sensor signal acquisition and calculation system, connected to the nitrogen oxide sensor, is used for data acquisition and calculation analysis.
[0014] The utility model has the following beneficial effects:
[0015] The utility model provides a device for testing the dynamic performance of a nitrogen oxide sensor, which can be used for batch testing the dynamic performance of nitrogen oxide sensors in the vehicle exhaust atmosphere during production. The testing device of the utility model can accurately test the dynamic performance of nitrogen oxide sensors by simulating the operating conditions of a running vehicle in the laboratory.
[0016] The device for testing the dynamic performance of the nitrogen oxide sensor of the utility model includes multiple groups of electrically controllable power switches. By controlling the on-off of the switches to adjust the heating power of the hot blast stove, it can simulate the load of the vehicle in different gears, providing a more comprehensive test environment for the nitrogen oxide sensor and ensuring that the performance of the sensor under various working conditions can be accurately evaluated. This comprehensive simulation ability enables the testing device of the utility model to provide more accurate test results for the dynamic performance of nitrogen oxide sensors, thereby ensuring the quality and performance of nitrogen oxide sensors during the production process.
[0017] Furthermore, by introducing an alternator, using the diesel engine to drive the alternator and supply power to the hot blast stove, simulating the load adjustment of the vehicle in different gears, and in an actual vehicle, the operation of the engine will drive the generator to supply power to the vehicle electrical system. By simulating this process in the testing device, the working conditions during vehicle operation can be more realistically reproduced, thus obtaining more accurate dynamic test results of the nitrogen oxide sensor.
[0018] Other beneficial effects in the embodiments of the utility model will be further described below. Description of the Drawings
[0019] Figure 1 It is a schematic structural diagram of the device for testing the dynamic performance of the nitrogen oxide sensor according to the embodiment of the utility model. Detailed Embodiments
[0020] The following provides a detailed description of the embodiments of the utility model. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the utility model.
[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. Additionally, the connection can be for a fixing function or for a coupling or communication function.
[0022] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.
[0024] Referring to Figure 1 , an apparatus for testing the dynamic performance of a nitrogen oxide sensor is provided according to an embodiment of the present invention, including: a diesel engine 1 that operates to provide exhaust gas for testing the nitrogen oxide sensor; an engine exhaust pipe 9 connected to the exhaust port of the diesel engine 1 for guiding the exhaust gas generated by the diesel engine 1 and having a nitrogen oxide sensor 5 installed thereon; a hot blast stove 4 including a resistive heater and a blower, the blower being used to disperse the heat generated by the resistive heater into the air; a power control switch 3 connected to the hot blast stove 4 and a controller, including a plurality of electrically controllable power switches, and adjusting the heating power of the hot blast stove by controlling the on / off of the switches to simulate the multi-gear load of a vehicle; an alternator 2 connected to the power shaft of the diesel engine 1, outputting alternating current and supplying power to the hot blast stove through the power control switch 3; a controller (such as a PLC controller 8) connected to the diesel engine 1 and the power control switch 3 for controlling the rotational speed of the diesel engine 1 and controlling the number of conduction channels of the power control switch 3 to simulate different working conditions of a vehicle; and a sensor signal acquisition and calculation system 7 connected to the nitrogen oxide sensor 5 for performing data acquisition and calculation analysis.
[0025] During operation, according to the gear of the vehicle to be simulated, the power of the hot blast stove can be adjusted through the power control switch, and the power of the alternator supplying power to the hot blast stove will be automatically adjusted, thereby driving the automatic adjustment of the diesel engine power (when the diesel engine power is automatically adjusted, the ECU of the diesel engine will adjust the fuel injection volume to keep the speed at the set speed, and the speed can be set in real time by the power controller of the diesel engine). When the power of the diesel engine changes, the exhaust gas temperature and NOx concentration emitted will also change accordingly, and the repeatability is very good, so as to realize the adjustment of the simulated vehicle gear and simulate different working conditions of the vehicle.
[0026] The diesel engine is used to drive the alternator and supply power to the hot blast stove. By adjusting the power of the hot blast stove, the load adjustment under different gears of the vehicle is simulated. And in an actual vehicle, the operation of the engine will drive the generator to supply power to the vehicle electrical system. By simulating this process in the test device, the working conditions during vehicle operation can be reproduced more realistically, so as to obtain more accurate dynamic test results of the nitrogen oxide sensor.
[0027] The test device of the present utility model can complete the test by simulating the operating conditions of a moving vehicle in the laboratory. The sensor signal acquisition and calculation system obtains the output value of the nitrogen oxide sensor and compares it with the standard sensor to test the performance of the sensor under test.
[0028] The dynamic performance test device for nitrogen oxide sensors of the present utility model provides a test solution that can simulate the actual vehicle driving conditions in a laboratory environment by integrating a diesel engine, a hot blast stove, a power control switch, a controller, and a sensor signal acquisition and calculation system. This test device can efficiently and accurately simulate the atmosphere of vehicle exhaust gas, including rapidly changing conditions such as temperature and flow rate, and measure the accuracy and dynamic response performance of the nitrogen oxide sensor. This test device can test multiple nitrogen oxide sensors simultaneously to achieve batch testing, significantly improving the test efficiency and reducing the cost.
[0029] The dynamic performance test device for nitrogen oxide sensors of the present utility model includes multiple groups of electrically controllable power switches. By controlling the on-off of the switches, the heating power of the hot blast stove is adjusted, which can simulate the load under different gears of the vehicle and provide a more comprehensive test environment for the nitrogen oxide sensor, ensuring that the performance of the sensor under various working conditions can be accurately evaluated. The comprehensive simulation ability of the present utility model is lacking in the prior art, which enables the test device of the present utility model to provide more accurate test results for the dynamic performance of the nitrogen oxide sensor, thus ensuring the quality and performance of the sensor during the production process.
[0030] In some embodiments, the controller may employ a PLC controller 8, which communicates with the diesel engine 1 and the power control switch 3 via a CAN bus 6. The power control switch 3 may include at least six groups of electrically controllable power switches for simulating the six-gear load of a vehicle. Preferably, 32 or more nitrogen oxide sensors 5 are installed simultaneously along the length of the engine exhaust pipe 9.
[0031] Specific embodiments of the present invention are further described below.
[0032] As Figure 1 shown, the test device mainly includes several parts such as a diesel engine 1, an alternator 2, a power control switch 3, a PLC controller 8, a hot blast stove 4, a sensor signal acquisition and calculation system 7, etc., as Figure 1 shown. 32 (or more, the exhaust pipe can be lengthened) nitrogen oxide sensors 5 can be installed on the engine exhaust pipe 9 simultaneously, and all tests can be completed with one ignition of the engine.
[0033] The diesel engine drives the alternator to operate and generate electricity, and the exhaust gas discharged is used as the measuring gas for the nitrogen oxide sensors; the engine speed can be adjusted through CAN messages; the alternator is rigidly connected to the engine and outputs three-phase alternating current after operation. Since the engine speed will change, the frequency of the output alternating current is variable; the alternating current output by the generator is output to the hot blast stove after passing through the power control switch. The power control switch is composed of multiple groups of electrically controllable power switches, which can be AC contactors or thyristors, etc. Setting 6 groups of switches is more suitable for nitrogen oxide testing and can simulate the 6-gear load of a vehicle, with good economy and practicality; the hot blast stove has multiple groups of resistive heaters, and each group has the same resistance and power; it is better to set 6 groups of heaters to match the power control switch; the heat generated by the heaters is dissipated into the air through a blower; the PLC controller sends CAN messages to set the engine speed and simultaneously changes the number of conducting channels of the power control switch, i.e., the load power. Through the combined change relationship between the engine speed and the load power, various different working conditions of the engine can be simulated. In this way, the characteristics such as the concentration, flow rate, temperature, and change rate of nitrogen oxides (NOx) in the exhaust gas discharged by the engine are exactly the same as those during actual vehicle driving and can be used as the atmosphere environment for the dynamic performance test of nitrogen oxide sensors; the computer acquisition system is connected to the nitrogen oxide sensors via a CAN bus to control the start, data acquisition, analysis, etc. of the nitrogen oxide sensors, and is synchronized with the PLC controller to achieve the automation of the test process; after the engine is ignited and started, the output values of each sensor are collected and recorded, and compared with the output values of the standard sensors. If the error is less than the set value, it is judged as qualified. For those exceeding the deviation, the deviation amount is calculated, and the deviation correction amount is written into the corresponding sensor to improve the accuracy and corresponding performance of the sensor to be measured.
[0034] The test device can fully simulate the working conditions during actual vehicle driving, including typical ones such as highways, suburban roads, urban roads, etc., and the simulated working conditions are repeatable. The process state is the same for each operation, and the test system can conduct batch tests for comparison. The simulated vehicle speed can be generated according to the combined corresponding relationship between the engine speed and the load magnitude. The engine range is 550 - 3000 rpm, and the load is the number of channels heated by the hot blast stove, with the same power for each channel.
[0035] The above content is a further detailed description of the present utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several alternatives or modifications can be made to these described embodiments, and these alternative or modified forms should all be regarded as belonging to the protection scope of the present utility model. In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "preferred embodiment", "example", "specific example", or "some examples", etc., means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the protection scope of the patent application.
Claims
1. A dynamic performance testing device for a nitrogen-oxygen sensor, characterized in that, Comprising: A diesel engine that operates to provide exhaust gas for testing a nitrogen oxide sensor; An engine exhaust pipe connected to the exhaust port of the diesel engine for guiding the exhaust gas generated by the diesel engine and equipped with a nitrogen oxide sensor; A hot blast stove including a resistive heater and a blower, where the blower is used to dissipate the heat generated by the resistive heater into the air; A power control switch connected to the hot blast stove and a controller, including multiple groups of electrically controllable power switches, and the heating power of the hot blast stove is adjusted by controlling the on / off of the switches to simulate the multi-gear load of a vehicle; An alternator connected to the power shaft of the diesel engine, outputting alternating current and supplying power to the hot blast stove through the power control switch; A controller connected to the diesel engine and the power control switch, used to control the rotational speed of the diesel engine and control the number of conduction channels of the power control switch to simulate different working conditions of a vehicle; A sensor signal acquisition and calculation system connected to the nitrogen oxide sensor for data acquisition and calculation analysis.
2. The nitrogen-oxygen sensor dynamic performance testing device according to claim 1, characterized in that The controller includes a PLC controller, and the PLC controller communicates with the diesel engine and the power control switch through a CAN bus.
3. The nitrogen-oxygen sensor dynamic performance testing device according to claim 1, characterized in that The power control switch includes at least six groups of electrically controllable power switches for simulating the six-gear load of a vehicle.
4. The nitrogen-oxygen sensor dynamic performance testing device according to claim 1, characterized in that, 32 or more nitrogen oxide sensors are installed simultaneously along the length direction of the engine exhaust pipe.
5. The nitrogen oxide sensor dynamic performance testing device according to claim 3, characterized in that, The power switch is an AC contactor or a thyristor.