Catalyst aging rack
By designing a catalytic converter aging test bench that includes a dynamometer, engine, exhaust, and injection modules, the problem of unstable temperature and oxygen content in existing catalytic converter aging test benches has been solved. This achieves stability and consistency of temperature and oxygen content during the catalytic converter aging process, improving the accuracy and efficiency of aging verification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-14
AI Technical Summary
Existing catalytic converter aging test benches have issues such as unstable oxygen content during secondary gas injection, excessive fluctuations in the catalytic converter's base temperature, and inconsistencies between the catalytic converter's maximum temperature and that of the actual vehicle, leading to inaccurate aging verification.
A catalyst aging test bench was designed, including a dynamometer module, an engine module, an exhaust module, and an air injection module. The engine fuel injection quantity is adjusted by the feedback signal from the oxygen sensor, the catalyst temperature is monitored by the temperature sensor, and the secondary air injection is controlled by the air injection module to ensure constant oxygen content and stable temperature, so as to achieve consistent temperature rise of the catalyst under each cycle.
This achieved stability of the catalyst temperature and constant secondary oxygen content, ensuring consistency of the catalyst's maximum temperature under each cycle, and improving the accuracy and efficiency of aging verification.
Smart Images
Figure CN224122180U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vehicle durability testing technology, and in particular to a catalyst aging test bench. Background Technology
[0002] With numerous vehicle emission standards allowing catalytic converters to undergo aging tests on catalytic converter benches (SBCs) instead of traditional real-vehicle durability verification, and with rapid bench aging significantly reducing certification time and costs, more and more OEMs are choosing catalytic converter benches for emission system development and verification testing. However, many catalytic converter benches have revealed several issues, such as unstable secondary oxygen content, excessive fluctuations in catalytic converter base temperature, and discrepancies between the maximum catalytic converter temperature on the bench and the maximum catalytic converter temperature in the actual vehicle.
[0003] Therefore, it is necessary to design a catalyst aging test bench that can meet the requirements of constant temperature, constant speed, constant flow rate, and convenient catalyst relocation. Utility Model Content
[0004] To address the shortcomings of the existing technology, the present invention aims to provide a catalyst aging test bench that can achieve stable catalyst temperature, constant secondary oxygen content, and consistency of the highest temperature point of the catalyst in each cycle.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A catalytic converter aging test bench includes a dynamometer module, an engine module, an exhaust module, and an air injection module;
[0007] The dynamometer module includes a dynamometer and a dynamometer control device. The dynamometer and the dynamometer control device are connected by a line. The dynamometer operates according to the instructions received by the dynamometer control device.
[0008] The engine module includes an engine and an engine control device. The engine is electrically connected to the engine control device, and the engine runs according to the commands output by the engine control device to ensure the stability of the engine's operating speed.
[0009] The exhaust module includes an exhaust pipe, an oxygen sensor, a temperature sensor, and a catalyst. In the engine closed-loop mode, the amount of fuel injected into the engine is adjusted by the signal fed back by the oxygen sensor to make the lambda in the exhaust gas of the engine as close to 1 as possible. At the same time, several temperature sensors are installed to collect the temperature of the engine exhaust port, the temperature in front of the catalyst, and the temperature of the catalyst, and to analyze the location of the highest temperature of the catalyst.
[0010] The air injection module includes a secondary air injection pipe, a secondary air injection solenoid valve, a pressure stabilizing chamber, a refrigerated dryer, and an air tank. The secondary air injection solenoid valve is controlled by commands output from the engine control unit. The compressed air in the air tank is dried by the refrigerated dryer, and the pressure in the pressure stabilizing chamber is repeatedly adjusted to deliver a constant amount of fresh air into the exhaust pipe. The oxygen sensor downstream of the secondary air injection pipe provides feedback on the detection signal value to ensure that the oxygen content in the exhaust pipe is 3% ± 0.1%, and the lambda is approximately 1.16.
[0011] In this invention, the engine exhaust heat source is stable, which allows the catalytic converter to age and maintain its durability under ideal operating temperature for a long time, effectively shortening its durability period. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of a catalyst aging platform proposed in this utility model.
[0013] In the diagram: 1. Dynamometer; 2. Engine; 3. Exhaust pipe; 4. Oxygen sensor; 5. Secondary air injection pipe; 6. Secondary air injection solenoid valve; 7. Catalytic converter; 8. Temperature sensor; 9. Pressure regulating chamber; 10. Air tank; 11. Refrigerated dryer; 12. Engine control unit; 13. Control panel; 14. Dynamometer control unit. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example
[0015] Reference Figure 1 A catalytic converter aging test bench includes a dynamometer module, an engine module, an exhaust module, and an air injection module. The dynamometer module includes a dynamometer 1 and a dynamometer control device 14. The dynamometer 1 and the dynamometer control device 14 are connected by a line. The dynamometer 1 operates according to the instructions received by the dynamometer control device 14.
[0016] The engine module includes an engine 2 and an engine control device 12. The engine 2 is electrically connected to the engine control device 12. The engine 2 operates according to the commands output by the engine control device 12, ensuring the stability of the engine 2's operating speed.
[0017] In this utility model, the exhaust module includes an exhaust pipe 3, multiple oxygen sensors 4, multiple temperature sensors 8, and a catalyst 7. The exhaust pipe 3 is bolted to the exhaust port of the engine 2. The catalyst 7 is installed inside the exhaust pipe 3 to ensure no air leakage. A muffler is installed at the other end of the exhaust pipe 3. The muffler is connected to the exhaust pipe 3 to reduce the noise of the exhaust gas.
[0018] In this utility model, the air replenishment module includes a secondary air replenishment pipe 5, a secondary air replenishment solenoid valve 6, a pressure stabilizing chamber 9, a refrigerated dryer 11, and an air storage tank 10. The secondary air replenishment pipe 5, the secondary air replenishment solenoid valve 6, the pressure stabilizing chamber 9, the refrigerated dryer 11, and the air storage tank 10 are connected in sequence. The other end of the secondary air replenishment pipe 5 is connected to the exhaust pipe 3 at the front end of the catalytic converter 7. The power supply of the secondary air replenishment solenoid valve 6 is regulated by the engine control device 12.
[0019] In this invention, multiple oxygen sensors 4 are respectively installed on the exhaust pipe 3, in front of the secondary air injection pipe 5, and in front of and behind the catalytic converter 7, and are connected to the engine control unit 12 or the air-fuel ratio meter. Multiple temperature sensors 8 are respectively located behind the oxygen sensors 4, in front of the catalytic converter 7, and on the catalytic converter 7, and are connected to the signal harness of the control panel 13.
[0020] In this utility model, the dynamometer module is connected to a control panel 13 via a signal harness. The dynamometer module controls the dynamometer control device 14 via the control panel 13 to control the dynamometer 1. The control panel 13 is connected to the control device 12, the temperature sensor 8, the oxygen sensor 4, and the signal harness of the dynamometer control device 14. The control device 12 is connected to the secondary air injection solenoid valve 6 and the signal harness of the engine 2.
[0021] The working principle of this utility model is as follows: The dynamometer module is connected to the engine module. The dynamometer control device 14 adjusts the dynamometer 1 to control the speed and load of the engine 2. The exhaust gas discharged from the engine 2 enters the exhaust pipe 3 and then goes to the catalytic converter 7, before being discharged back to the exhaust pipe 3. The signal value fed back by the oxygen sensor 4 at the exhaust port of the engine 2 is transmitted to the engine control device 12 to achieve closed-loop control of the engine 2. On the other hand, during the aging cycle operation, the control panel 13 transmits the control signal to the engine control device 12 to control the engine 2 to enter the open-loop enrichment and secondary air injection solenoid valve 6. For example, when the secondary air injection solenoid valve 6 is working, it introduces fresh air... The gas is transported through the gas tank 10, the refrigerated dryer 11, and the pressure regulating chamber 9 to the secondary air injection pipe 5 and then into the exhaust pipe 3. In addition, the temperature sensor 8 detects the exhaust temperature of the engine 2, the temperature in front of the catalytic converter 7, and the temperature inside the catalytic converter 7, and transmits the data to the control panel for display. This ensures that the temperature of the catalytic converter 7 at its highest temperature is 800℃ ± 5℃ when the engine 2 is under closed-loop control. When the engine 2 is under open-loop control, the peak temperature of the catalytic converter 7 is kept at 890℃ ± 5℃ by adjusting the engine 2 fuel consumption and the secondary air injection amount and oxygen content by 3% ± 0.1%. When the temperature required for the catalytic converter 7 under closed-loop control is lower than 800℃, the peak temperature of the catalytic converter 7 only needs to be 90℃ higher than the closed-loop temperature.
[0022] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A catalytic converter aging test bench comprising a dynamometer module, an engine module, an exhaust module, and a gas supplement module, characterized in that, The dynamometer module includes a dynamometer (1) and a dynamometer control device (14). The dynamometer (1) and the dynamometer control device (14) are connected by a line. The dynamometer (1) operates according to the instructions received by the dynamometer control device (14). The engine module includes an engine (2) and an engine control device (12). The engine (2) is electrically connected to the engine control device (12). The engine (2) operates according to the instructions output by the engine control device (12) to ensure the stability of the engine (2) operating speed.
2. The catalytic converter aging bench of claim 1, wherein, The exhaust module includes an exhaust pipe (3), multiple oxygen sensors (4), multiple temperature sensors (8) and a catalyst (7). The exhaust pipe (3) is bolted to the exhaust port of the engine (2), and a muffler is installed at the other end of the exhaust pipe (3).
3. The catalytic converter aging bench of claim 1, wherein, The air replenishment module includes a secondary air replenishment pipe (5), a secondary air replenishment solenoid valve (6), a pressure stabilizing chamber (9), a refrigerated dryer (11), and an air storage tank (10). The secondary air replenishment pipe (5), the secondary air replenishment solenoid valve (6), the pressure stabilizing chamber (9), the refrigerated dryer (11), and the air storage tank (10) are connected in sequence. The other end of the secondary air replenishment pipe (5) is connected to the exhaust pipe (3) at the front end of the catalyst (7). The power supply of the secondary air replenishment solenoid valve (6) is regulated by the engine control device (12).
4. The catalytic converter aging bench of claim 2, wherein, The catalyst (7) is located inside the exhaust pipe (3).
5. The catalytic converter aging bench of claim 2, wherein, Multiple oxygen sensors (4) are respectively installed on the exhaust pipe (3), in front of the secondary air supply pipe (5), and in front of and behind the catalyst (7), and are connected to the engine control unit (12).
6. The catalytic converter aging bench of claim 2, wherein, Multiple temperature sensors (8) are respectively located behind the oxygen sensor (4) and in front of and on the catalyst (7), and are connected to the signal harness of the control panel (13).
7. The catalytic converter aging bench of claim 1, wherein, The dynamometer module is connected to a control panel (13) via a signal harness. The dynamometer module controls the dynamometer control device (14) via the control panel (13) to control the dynamometer (1).
8. A catalyst aging test bench according to claim 7, characterized in that, The control panel (13) is connected to the signal harnesses of the control device (12), temperature sensor (8), oxygen sensor (4) and dynamometer control device (14), respectively. The control device (12) is connected to the signal harnesses of the secondary air supply solenoid valve (6) and engine (2), respectively.