A three-way catalyst heating control system and control method

Abstract

The application relates to the field of three-way catalyst processing, and discloses a three-way catalyst heating control system, which comprises a heating chamber, a circulating air driving device, a heating device, a product conveying belt and a controller. The heating chamber is divided into a hot air circulating cavity and a product heating cavity. The lower part of the product heating cavity is provided with a hot air input pipe provided with a hot air flow control valve and a hot air temperature sensor. The middle part of the product heating cavity is provided with the product conveying belt provided with an air inlet temperature sensor and an air outlet temperature sensor on the upper and lower sides. The lower part of the hot air circulating cavity is provided with the circulating air driving device. The upper part of the hot air circulating cavity is provided with the heating device comprising a heating pipe, a heating control unit and a circulating air temperature sensor. The hot air flow control valve, the hot air temperature sensor, the heating control unit, the circulating air temperature sensor, the air inlet temperature sensor and the air outlet temperature sensor are electrically connected with the controller, so that the heating temperature can be accurately controlled. The application further discloses a three-way catalyst heating control method.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of three-way catalyst processing, and particularly relates to a three-way catalyst heating control system. BACKGROUND

[0002] The three-way catalyst is an off-machine purification material installed in the exhaust system of a vehicle, which can convert the CO, HC and NOx harmful gases discharged from the vehicle exhaust into harmless carbon dioxide, water and nitrogen gas through oxidation and reduction. When the high-temperature vehicle exhaust passes through the three-way catalyst, the CO, HC and NOx three main harmful gases in the exhaust gas are subjected to oxidation-reduction chemical reactions under the catalytic action of the catalytic medium under high-temperature conditions, in which the CO is oxidized into colorless and non-toxic carbon dioxide gas by reacting with oxygen in the air; the HC is oxidized into water and carbon dioxide under high temperature; and the NOx is reduced into nitrogen and oxygen. The three harmful gases are changed into harmless gases, so that the vehicle exhaust is purified, the exhaust emission quality of the vehicle is improved, and the three-way catalyst is widely used in vehicles with high emission requirements. X X X

[0003] The three-way catalyst is usually formed by attaching the catalytic medium on the porous carrier, which is usually made of porous ceramic material to form the shape of the three-way catalyst. The porous medium is beneficial to increase the attachment amount of the catalytic medium and increase the contact area of the catalytic medium with the vehicle exhaust, thereby increasing the speed of the oxidation-reduction reaction of the harmful gases in the vehicle exhaust. The catalytic medium usually uses metal platinum, rhodium and palladium materials, which is usually added on the porous carrier by spraying and the like, and the catalytic medium covers the surface of the internal pores of the porous carrier. After drying and sintering treatment, the catalytic medium is firmly attached to the surface of the porous carrier, which greatly increases the contact area of the vehicle exhaust with the catalyst.

[0004] ​​​The drying and sintering of the three-way catalyst is usually carried out in a heating furnace, and in order to ensure the adhesion quality of the catalyst medium on the porous carrier, the drying and sintering temperature of the three-way catalyst needs to be controlled at a set value. At the same time, the heating waste gas in the heating furnace needs to be discharged and the fresh air needs to be supplemented to improve the heating environment of the three-way catalyst. In order to control the drying and sintering temperature of the three-way catalyst, a plurality of heating chambers are usually arranged in the drying and sintering furnace, and a temperature sensor is arranged in each heating chamber to monitor the heating temperature in the heating chamber. When the heating temperature in the heating chamber reaches the set temperature, the heating device in the heating chamber is turned off, and when the temperature in the heating chamber is lower than the set temperature, the heating device is turned on. The temperature control method is relatively rough, and the temperature in the heating furnace fluctuates greatly. Some three-way catalyst heating furnaces use heating waste gas to preheat the supplemented fresh air to improve the thermal efficiency of the three-way catalyst sintering furnace. However, the preheating temperature of the fresh air is usually much lower than the heating temperature, and the fluctuation of the fresh air temperature has little effect on the temperature in the heating furnace, which is usually not considered in the temperature control process of the heating furnace. SUMMARY

[0005] In order to accurately control the heating temperature of the three-way catalyst, the application provides a three-way catalyst heating control system and a control method.

[0006] The three-way catalyst heating control system provided by the application adopts the following technical scheme:

[0007] A three-way catalyst heating control system, comprising a heating chamber, a circulating air driving device, a heating device, a product conveying belt and a controller, the heating chamber comprising a hot air circulation cavity and a product heating cavity connected at the upper and lower ends, the lower part of the product heating cavity being provided with a hot air input pipe, the hot air input pipe being provided with a hot air flow control valve and a hot air temperature sensor, the upper part of the product heating cavity being provided with an exhaust pipe, the circulating air driving device being arranged at the lower part of the hot air circulation cavity to drive the gas in the heating chamber to flow to the upper part of the hot air circulation cavity, the heating device being arranged at the upper part of the hot air circulation cavity and comprising a heating pipe, a heating control unit and a circulating air temperature sensor, the heating control unit being electrically connected with the heating pipe, the product conveying belt being arranged at the middle part of the product heating cavity, the upper part of the product conveying belt being provided with an inlet air temperature sensor and the lower part being provided with an outlet air temperature sensor, the hot air flow control valve, the hot air temperature sensor, the heating control unit, the circulating air temperature sensor, the inlet air temperature sensor and the outlet air temperature sensor being electrically connected with the controller.

[0008] By adopting the technical scheme, the hot air flow control valve and the hot air temperature sensor arranged on the hot air input pipe at the lower part of the product heating cavity and the air outlet temperature sensor arranged below the product conveying belt can control the amount of hot air input through the hot air input pipe, mix the recovered air after heating the product with a certain amount of hot air, and form circulating air with a suitable temperature, thereby reducing the energy consumption of the heating device and meeting the temperature requirement for heating the three-way catalyst; the heating control unit and the circulating air temperature sensor are arranged to heat the circulating air when the temperature of the circulating air does not meet the requirement, so that the temperature of the circulating air can be better controlled around the set temperature; the air inlet temperature sensor arranged above the product conveying belt can more accurately control the temperature at the product conveying belt and improve the stability of the heating temperature of the three-way catalyst.

[0009] In a specific embodiment, the circulating air driving device comprises a moving base, a circulating air motor, a circulating transmission shaft, a heat insulating body and a heat-resistant air wheel, the circulating air motor is connected with the circulating transmission shaft, the transmission speed reduction mechanism is arranged on the moving base, the heat insulating body is fixed to one end of the moving base, the circulating transmission shaft passes through the heat insulating body and is connected with the heat-resistant air wheel, and the sidewall of the heating chamber is provided with a driving window hole, the circulating air driving device can move along the direction of the driving window hole, so that the heat insulating body can close the driving window hole.

[0010] By adopting the technical scheme, the heat insulating body is arranged to place the circulating air motor and the heat-resistant air wheel on the two sides of the heat insulating body, the circulating air motor is arranged in a lower temperature environment outside the heating furnace while the heat-resistant air wheel drives the circulating air to flow in the heating furnace, so that the circulating air motor is prevented from being damaged by heat; the moving base is arranged to move the circulating air driving device to a lower temperature position away from the heating furnace when the heat-resistant air wheel is damaged or the circulating air driving device needs to be maintained, so that the circulating air driving device is convenient to maintain and repair.

[0011] In a specific embodiment, the heating control unit comprises a control module and a power processing module, the control module is electrically connected with the power processing module and the controller, and the power processing module is electrically connected with the heating pipe, the control module can form a pulse control signal with different duty cycles under the control of the controller, and the power processing module can form a pulse power source with different duty cycles under the control of the pulse control signal.

[0012] By adopting the technical scheme, the control module and the power processing module form a pulse power source with different duty cycles, so that the heating power of the heating pipe can be accurately controlled, and the stability of the temperature of the circulating air after heating is improved.

[0013] In one specific implementation, the ternary catalyst heating control system of the application further comprises an air guide device arranged above the product conveying belt in the product heating cavity, the air guide device comprising an air guide structure and a lifting structure, the air guide structure comprising an air guide frame and a plurality of air guide plates, the plurality of air guide plates being arranged at intervals on the inner side of the air guide frame, an air guide channel being formed between adjacent air guide plates or between the air guide plates and the air guide frame, the air guide channel having an inlet area larger than an outlet area, the air guide frame being connected to the lifting structure, and the lifting structure being electrically connected to the controller.

[0014] By using the above technical solution, the air guide device can form a uniform circulating air flow, improving the uniformity of ternary catalyst heating at different positions in the heating furnace. The air guide channel has an inlet area larger than an outlet area, which can increase the speed of the air flow blowing towards the ternary catalyst, so that the circulating air flow can penetrate deep into the ternary catalyst, improving the heating effect inside the ternary catalyst. The lifting structure connected to the air guide frame can adjust the distance between the air guide structure and the ternary catalyst, facilitating the passage of the ternary catalyst while ensuring the circulating air flow speed at the ternary catalyst.

[0015] In one specific implementation, the air guide structure further comprises an air guide adjustment plate arranged on one side of the air guide plate and capable of rotating under the drive of an adjustment plate drive mechanism to change the outlet area of the air guide channel, and the adjustment plate drive mechanism is electrically connected to the controller.

[0016] By using the above technical solution, the air guide adjustment plate and the adjustment plate drive mechanism can adjust the outlet area of the air guide channel, thereby conveniently adjusting the air flow speed of the circulating air flowing out of the air guide structure.

[0017] The ternary catalyst heating control method of the application adopts the following technical solution:

[0018] A ternary catalyst heating control method, which uses the ternary catalyst heating control system provided by the application to control the heating temperature, comprising the following steps: S10: obtaining the detection values of the hot air temperature sensor and the outlet air temperature sensor; S20: adjusting the flow of the hot air flow control valve according to the detection values of the outlet air temperature sensor and the hot air temperature sensor; S30: obtaining the detection value of the circulating air temperature sensor; S40: when the detection value of the circulating air temperature sensor is less than a set temperature, controlling the heating device to heat the circulating air; S50: obtaining the detection value of the inlet air temperature sensor; S60: controlling the heating control unit according to the detection value of the inlet air temperature sensor to adjust the heating power of the heating tube.

[0019] By adopting the technical scheme, when the hot air temperature is higher than the set heating temperature, the hot air with appropriate flow rate can be mixed with the recovered air after the product is heated, so that the temperature of the circulating air reaches the set heating temperature, thereby reducing the energy consumption of the heating furnace without heating the three-way catalyst to the set temperature by the heating device; the heating device can be used to moderately heat the circulating air when the temperature of the circulating air does not reach the set temperature, so that the temperature of the circulating air is maintained near the set temperature, the control accuracy of the temperature of the circulating air is improved, and the energy consumption is reduced; the real-time temperature of the circulating air flowing to the product conveying belt can be detected by the inlet air temperature sensor, so that the heating temperature of the three-way catalyst is more accurately controlled.

[0020] In a specific implementable embodiment, the method of the present application further comprises the step of: S35: adjusting the hot air flow control valve according to the detection value of the circulating air temperature sensor, so that the flow rate of the hot air flowing in through the hot air input pipe decreases as the detection value of the circulating air temperature sensor increases.

[0021] By adopting the technical scheme, the circulating air temperature sensor can be used to detect the temperature of the circulating air flowing to the heating device, and the circulating air temperature is adjusted in real time according to the hot air temperature and the recovered air temperature, and the circulating air temperature is adjusted by negative feedback according to the detection temperature of the circulating air temperature sensor, so as to improve the stability of the circulating air temperature.

[0022] In a specific implementable embodiment, the method of the present application further comprises the following step: S70: detecting the height of the three-way catalyst, and adjusting the lifting mechanism according to the height of the three-way catalyst, so that the spacing distance between the air guide structure and the three-way catalyst is within the set range.

[0023] By adopting the technical scheme, the height of the three-way catalyst is used to adjust the lifting mechanism, on the one hand, so that three-way catalysts of different heights can pass below the air guide structure, improving the product adaptability of the heating furnace, and on the other hand, adjusting the wind speed of the circulating air blown out of the air guide structure when reaching the three-way catalyst, controlling the heating effect of the three-way catalyst.

[0024] In a specific implementable embodiment, in S70, the spacing distance is controlled to increase as the detection value of the inlet air temperature sensor increases.

[0025] By adopting the technical scheme, when the temperature of the circulating air increases, the spacing distance between the air guide structure and the three-way catalyst is increased, so that the speed of the circulating air when reaching the three-way catalyst is slowed down, thereby reducing the amount of circulating air contacting the three-way catalyst and the depth of circulating air into the three-way catalyst, and maintaining the stability of the heating effect of the three-way catalyst.

[0026] In one specific implementation, the method of the present application further comprises the step of: S80: controlling the adjusting plate driving mechanism according to the detection value of the inlet air temperature sensor, so that the outlet area of the air guide channel increases with the increase of the detection value of the inlet air temperature sensor.

[0027] By using the above technical solution, the area of the air outlet of the air guide channel is adjusted by the detection value of the inlet air temperature sensor, which can reduce the speed of the circulating air flowing out of the air guide outlet with the increase of the circulating air temperature, thereby maintaining the stability of the heating effect of the three-way catalyst.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] 1. By using the outlet air temperature sensor, the hot air temperature sensor and the hot air flow control valve, the hot air flow through the hot air flow control valve can be controlled according to the hot air temperature and the temperature of the recovered air after heating the product, thereby controlling the temperature of the circulating air formed by mixing the recovered air and the hot air, and reducing the energy consumption of the heating furnace without heating by the heating device when the temperature of the circulating air reaches the required heating temperature;

[0030] 2. By using the circulating air temperature sensor, the temperature of the circulating air reaching the heating device can be detected, the circulating air can be heated when the temperature of the circulating air does not reach the required heating temperature, the stability of the circulating air temperature is ensured, and the hot air flow into the heating chamber can be controlled by using the detection temperature of the circulating air temperature sensor, thereby improving the control accuracy of the circulating air temperature;

[0031] 3. By using the inlet air temperature sensor, the temperature of the circulating air at the product conveying belt can be detected, thereby more stably and accurately controlling the heating temperature of the three-way catalyst;

[0032] 4. By using the air guide structure and the lifting structure, the uniformity of the circulating air flow at different positions of the three-way catalyst on the product conveying belt can be improved, and the circulating air flow rate at the three-way catalyst can be controlled by controlling the distance between the air guide structure and the three-way catalyst, thereby controlling the heating effect of the three-way catalyst. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a cross-sectional view of an embodiment of the three-way catalyst heating control system of the present application.

[0034] Figure 2 It is a control block diagram of an embodiment of the three-way catalyst heating control system of the present application.

[0035] Figure 3 It is a schematic diagram of the power supply processing module in an embodiment of the three-way catalyst heating control system of the present application.

[0036] Figure 4 The control module schematic diagram for one embodiment of the TWC heating control system of the present application.

[0037] Figure 5 The air guide structure schematic diagram for one embodiment of the TWC heating control system of the present application.

[0038] Figure 6 The adjustment plate driving mechanism partial schematic diagram for one embodiment of the TWC heating control system of the present application.

[0039] Figure 7 The flow chart diagram for one embodiment of the TWC heating control method of the present application.

[0040] The air guide structure schematic diagram for one embodiment of the TWC heating control system of the present application. DETAILED DESCRIPTION

[0041] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] One embodiment of the TWC heating control system of the present application is shown inFigure 1 and Figure 2 As shown in the figure, it comprises a heating chamber 1, a circulating air driving device 2, a heating device 3, a product conveying belt 4 and a controller 5. The heating chamber 1 is a chamber piled by heat insulation materials, usually a part of a three-way catalyst heating furnace. A vertical partition structure is arranged in the middle of the heating chamber 1, which separates the internal space of the heating chamber 1 into a hot air circulating cavity 11 and a product heating cavity 12, which are connected to each other at the upper and lower ends and isolated from each other in the middle.

[0044] The circulating air driving device 2 is arranged at the lower part of the hot air circulating cavity 11. When the circulating air driving device 2 works, it can suck the gas at the lower part of the product heating cavity 12 and discharge it to the upper part of the hot air circulating cavity 11. Then the gas enters the upper part of the product heating cavity 12 and flows downward along the product heating cavity 12, forming a circulating air flowing in the heating chamber 1.

[0045] The heating device 3 is arranged at the upper part of the hot air circulating cavity 11. When the heating device 3 works, it can heat the gas around the heating device 3, so that the temperature of the circulating air rises. The heating device 3 is arranged above the circulating air driving device 2. On the one hand, it can make the gas heated by the heating device 3 circulate into the product heating cavity 12 as soon as possible to heat the three-way catalyst products. On the other hand, it can make the circulating air driving device 2 be in the gas flow which is not heated by the heating device 3, so as to reduce the heating degree of the circulating air driving device 2.

[0046] The heating device 3 comprises a heating pipe 31, a heating control unit 32 and a circulating air temperature sensor 33. The heating pipe 31 is usually arranged in multiple. The multiple heating pipes 31 are arranged dispersedly in the hot air circulating cavity 11, which is conducive to the heat generated by the heating pipe 31 to be dispersed into the circulating air flow more quickly, and is also conducive to the uniform heating of the circulating air flow. The power supply end of the heating pipe 31 penetrates the wall of the heating chamber 1 and is connected to the heating control unit 32 arranged outside the heating chamber 1 through a power supply lead. The heating control unit 32 can be various control circuit units capable of controlling the power supply state of the heating pipe 31. Through the heating control unit 32, whether to supply power to the heating pipe 31 to heat and the heating power of the heating pipe 31 can be controlled, so as to adjust the temperature of the circulating air flow. The circulating air temperature sensor 33 can be various temperature sensors capable of detecting the temperature of the circulating air, such as infrared temperature sensor, thermocouple, etc. The circulating air temperature sensor 33 is arranged below the heating pipe 31 and can detect the temperature of the circulating air flowing to the heating pipe 31.

[0047] The product conveying belt 4 is arranged in the middle of the product heating cavity 12 and across the product heating cavity 12. The three-way catalyst to be heated is placed on the product conveying belt 4, and moves in the product heating cavity 12 along with the product conveying belt 4. The product conveying belt 4 is usually made of stainless steel material with high temperature resistance. The high-temperature circulating air in the product heating cavity 12 flows downward through the product conveying belt 4 from top to bottom and fully contacts the three-way catalyst, thereby transferring heat to the three-way catalyst and heating the three-way catalyst. An air inlet temperature sensor 41 is arranged above the product conveying belt 4 and detects the air inlet temperature of the air flowing to the three-way catalyst for heating the three-way catalyst. An air outlet temperature sensor 42 is arranged below the product conveying belt 4 and detects the air outlet temperature of the air after heating the three-way catalyst.

[0048] A hot air input pipe 13 is arranged below the product conveying belt 4 in the lower part of the product heating cavity 12. The hot air input pipe 13 penetrates the sidewall of the heating chamber 1 from the outside of the heating chamber 1 and enters the product heating cavity 12, and is used to send the external hot air into the heating chamber 1. Usually, the external hot air is obtained by heat exchange between the high-temperature exhaust gas discharged from the three-way catalyst baking furnace and the air flow in the fresh air pipeline. The temperature of the exhaust gas discharged from the three-way catalyst baking furnace is usually above 500°C, and the air in the fresh air pipeline can be easily heated to above 150°C, usually to 180-200°C, to form hot air. The hot air entering the lower part of the product heating cavity 12 is mixed with the air after heating the three-way catalyst, and enters the hot air circulating cavity 11 under the action of the circulating air driving device 2 to form circulating air.

[0049] An exhaust gas discharge pipe 14 is arranged in the upper part of the product heating cavity 12 and is used to discharge the high-humidity exhaust gas formed after heating the three-way catalyst in the heating chamber 1, thereby ensuring the drying and baking effect of the three-way catalyst. A flow control valve can also be arranged on the exhaust gas discharge pipe 14 and is used to adjust the size of the exhaust gas flow discharged through the exhaust gas discharge pipe 14.

[0050] A hot air flow control valve 131 is arranged on the hot air input pipe 13 outside the heating chamber 1 and can adjust the size of the hot air flow entering the heating chamber 1 through the hot air input pipe 13 under the control of an electric control signal. A hot air temperature sensor 132 is arranged at the air outlet of the hot air input pipe 13 and is used to detect the temperature of the hot air entering the heating chamber 1.

[0051] The hot air flow control valve 131, the hot air temperature sensor 132, the heating control unit 32, the circulating air temperature sensor 33, the inlet air temperature sensor 41 and the outlet air temperature sensor 42 are connected to the controller 5 through control lines, and the controller 5 is arranged outside the heating chamber 1 and can be a PLC, a single-chip microcomputer or an industrial computer. One controller 5 can be used for each heating chamber 1, or one controller 5 can be used to control multiple heating chambers 1 in one three-way catalyst heating furnace.

[0052] The controller 5 stores the set temperature required for heating the three-way catalyst in the heating chamber 1, and can also obtain the hot air temperature detected by the hot air temperature sensor 132 and the outlet air temperature of the product conveying belt 4 detected by the outlet air temperature sensor 42, and adjust the flow rate of the hot air passing through the hot air flow control valve 131 according to the hot air temperature and the outlet air temperature, so as to control the proportion of the hot air and the outlet air of the product conveying belt 4, so that the temperature of the circulating air formed by mixing the two reaches or approaches the set temperature, thereby eliminating the need for the heating device 3 to heat the circulating air, or reducing the heating range of the heating device 3 to the circulating air, thereby reducing the energy consumption of the heating device 3 when heating.

[0053] For the heating chamber used for drying the three-way catalyst, the set temperature required for the heating chamber 1 is usually about 150°C, and in the continuous drying process, the outlet air temperature of the three-way catalyst heated by the product conveying belt 4 does not decrease much, and after mixing a certain amount of hot air at 180-200°C, the temperature of the circulating air can be increased to 150°C, thereby eliminating the need for the heating device 3 to heat the circulating air; even if the temperature of the hot air is about 150°C, as long as the temperature is higher than the outlet air temperature, the temperature of the circulating air can approach the set temperature by mixing the hot air, thereby reducing the heating amount of the circulating air to the set temperature. In this way, the energy consumption of the heating device 3 is effectively reduced. When the temperature of the hot air is lower than the outlet air temperature, the introduction of the hot air will cause the temperature of the circulating air to decrease, at this time, the controller 5 controls the hot air flow control valve 131 to control the flow rate of the hot air entering the heating chamber 1 through the hot air input pipe 13 to the minimum flow rate required for maintaining the exhaust gas discharge in the heating chamber 1, thereby minimizing the energy consumption of the heating device 3.

[0054] For the heating chamber used for baking the three-way catalyst, since the temperature of the hot air is much lower than the temperature in the heating chamber 1 and also much lower than the outlet air temperature of the product conveying belt 4, at this time, the controller 5 also controls the hot air flow control valve 131 to control the flow rate of the hot air entering the heating chamber 1 through the hot air input pipe 13 to the minimum flow rate required for maintaining the exhaust gas discharge in the heating chamber 1, thereby reducing the energy consumption of the heating device 3.

[0055] In some embodiments of the three-way catalyst heating control system of the present application, as shown inFigure 1 As shown, the circulating air driving device 2 comprises a moving base 21, a circulating air motor 22, a circulating transmission shaft 23, a heat insulation body 24 and a heat-resistant wind wheel 25. The circulating transmission shaft 23 is fixed on the moving base 21 through a support frame and can rotate on the support frame. The circulating air motor 22 can be fixed on the support frame or the moving base 21, and the circulating air motor 22 is drivingly connected with the circulating transmission shaft 23.

[0056] The heat insulation body 24 is fixed on one end of the moving base 21, and one end of the circulating transmission shaft 23 extends out of the end of the moving base 21 and passes through the heat insulation body 24 to be connected with the heat-resistant wind wheel 25. The circulating transmission shaft 23 is rotationally connected with the heat insulation body 24. When the circulating air motor 22 rotates, the heat-resistant wind wheel 25 can be driven to rotate by the circulating transmission shaft 23 to drive the surrounding gas to flow.

[0057] A driving window hole is arranged on the side wall of the heating chamber 1 and is arranged at the lower part of the hot air circulating cavity 11. The heat insulation body 24 is made of heat insulation material and is usually the same as the material and structure of the side wall of the heating chamber 1. The shape and size of the heat insulation body 24 are the same as those of the driving window hole. The moving base 21 can move in the direction of the driving window hole outside the heating chamber 1 to drive the heat-resistant wind wheel 25 to enter the heating chamber 1 through the driving window hole and make the heat insulation body 24 enter the driving window hole to close the driving window hole. At this time, the heat-resistant wind wheel 25 is located in the heating chamber 1, the moving base 21 and the circulating air motor 22 are located outside the heating chamber 1, and the circulating transmission shaft 23 connects the circulating air motor 22 located outside the heating chamber 1 and the heat-resistant wind wheel 25 located in the heating chamber 1. The heat-resistant wind wheel 25 is usually made of heat-resistant alloy to reduce the ablation of the heat-resistant wind wheel 25 in a high-temperature environment, and the heat insulation body 24 can isolate the temperature inside and outside the heating chamber 1 to reduce the influence of high temperature on the structure such as the circulating air motor 22 and reduce the heat loss in the heating chamber 1.

[0058] Moving the moving base 21 in the direction away from the driving window hole can drive the heat insulation body 24 to move away from the driving window hole and drive the heat-resistant wind wheel 25 to move to the outside of the heating chamber 1 through the driving window hole. This can be used to move the heat-resistant wind wheel 25 to the outside of the heating chamber 1 when the heat-resistant wind wheel 25 fails, so that the temperature of the circulating air driving device 2 can quickly decrease, and the heat-resistant wind wheel 25 can be quickly repaired or replaced to restore the normal work of the circulating air driving device 2 as soon as possible.

[0059] In a preferred embodiment of the three-way catalyst heating control system of the present application, as shown in Figure 2As shown in the figure, the heating control unit 32 comprises a control module 321 and a power processing module 322. The power processing module 322 is used to form different forms of power supply, and the control module 321 is used to control the power supply form of the power processing module 322. The control module 321 is electrically connected with the controller 5, and can generate different power control signals under the control of the controller 5; the power processing module 322 is electrically connected with the control module 321, and can form different forms of power supply according to the power control signal of the control module 321; the heating pipe 31 is electrically connected with the power processing module 322, and can generate heat under the action of the power supply to heat the circulating air and control the temperature of the circulating air. The principle of a control module 321 is as shown in the figure Figure 3 As shown in the figure, the control module 321 can generate pulse control signals with different frequencies and different duty cycles under the control of the controller 5. The principle of a power processing module 322 is as shown in the figure Figure 4 As shown in the figure, the power processing module 322 can form pulse power with different frequencies and different duty cycles according to the pulse control signal of the control module 321, and the heating pipe 31 is powered by the power supply, which can more accurately control the heating power of the heating pipe 31, thereby accurately controlling the temperature of the circulating air.

[0060] In some embodiments of the three-way catalyst heating control system of the present application, as shown in the figure Figure 1 The three-way catalyst heating control system of the present application further comprises a wind guide device 6. The wind guide device 6 is a device that can guide the flow of circulating air so that the circulating air can more uniformly blow to the product conveying belt 4 to heat the three-way catalyst placed on the product conveying belt 4. The wind guide device 6 is arranged in the middle of the product heating cavity 12 and above the product conveying belt 4. Generally, the distance between the air outlet of the wind guide device 6 and the three-way catalyst on the product conveying belt 4 is set to 30-40mm, so that the circulating air can uniformly blow to the three-way catalyst at a certain speed and can penetrate the porous carrier of the three-way catalyst into the interior of the three-way catalyst, better heating the three-way catalyst.

[0061] The wind guide device 6 comprises a wind guide structure 61 and a lifting structure 62. As shown in the figure Figure 5As shown, the air guiding structure 61 includes an air guiding frame 611 and air guiding plates 612. The air guiding frame 611 is arranged around the periphery of the air guiding structure 61, forming its external shape. Multiple air guiding plates 612 are spaced apart and arranged parallel to each other inside the air guiding frame 611, creating a uniform partition of the inner space. Air guiding channels with approximately the same flow area are formed between adjacent air guiding plates 612, or between an air guiding plate 612 and the air guiding frame 611. The upper and lower sides of the air guiding plates 612 can have different thicknesses, resulting in a larger gap between the upper and lower sides of the plates, meaning a larger inlet area and a smaller outlet area for the air guiding channel. This allows for a uniformly distributed airflow with a high velocity at the outlet of the air guiding channel when circulating air passes through it, improving the heating effect on the three-way catalytic converter.

[0062] like Figure 1 As shown, the lifting structure 62 includes a lifting reducer 621, a lifting wheel shaft 622, and a lifting chain 623. The lifting wheel shaft 622 traverses the product heating chamber 12, with its two ends rotatably mounted on the partition structure in the middle of the heating chamber 1 and the side wall of the heating chamber 1, respectively, and one end extending out of the side wall of the heating chamber 1. The lifting reducer 621 is fixed to the outside of the side wall of the heating chamber 1 and connected to the lifting wheel shaft 622. The lifting reducer 621 can rotate under the drive of the lifting motor, thereby causing the lifting wheel shaft 622 to rotate slowly. Two sprockets are provided on the lifting wheel shaft 622 and on both sides of the product heating chamber 12. The lifting chain 623 is provided on the sprockets and meshes with them. A lifting rod 6111 is provided on the air guide frame 611. The lower end of the lifting chain 623 is connected to the lifting rod 6111. When the lifting wheel shaft 622 rotates, the lifting chain 623 can pull the air guide structure 61 up and down. Typically, two lifting structures 62 are installed at the front and rear ends of the heating chamber 1. The four lifting chains 623 on the two lifting structures 62 can pull the air guide frame 611 from the four corners of the air guide frame 611, thereby improving the stability of the lifting of the air guide structure 61.

[0063] The lifting motor is electrically connected to the controller 5. The controller 5 can control the rotation of the lifting motor, thereby controlling the lifting action and lifting distance of the air guide structure 61.

[0064] As one specific embodiment of the three-way catalytic converter heating control system of this application, such as Figure 5 As shown, the air guide structure 61 is also provided with an air guide adjustment plate 613 and an adjustment plate drive mechanism 614. The air guide adjustment plate 613 is installed on one side of the air guide plate 612 and can rotate relative to the upper end of the air guide plate 612, thereby blocking the outlet side below the air guide channel and adjusting the outlet area of ​​the air guide channel.

[0065] The adjusting plate driving mechanism 614 comprises an adjusting plate driving shaft 6141 and an adjusting plate driving wheel 6142, as shown in the figure. Figure 6 The driving wheel fixing frame 6112 is arranged on one side of the air guide frame 611, the rotating shaft of the adjusting plate driving wheel 6142 is installed on the driving wheel fixing frame 6112 and can rotate on the driving wheel fixing frame 6112. The adjusting plate driving shaft 6141 is arranged perpendicularly to the air guide plate 612 and the air guide adjusting plate 613, the driving shaft passing holes are arranged at the opposite positions of the air guide plate 612 and the air guide adjusting plate 613, the adjusting plate driving shaft 6141 is slidingly installed on the air guide frame 611 through the driving shaft passing holes and one end thereof extends out of the air guide frame 611 to the adjusting plate driving wheel 6142. The driving wheel eccentric rod 6143 is arranged at the edge portion of the adjusting plate driving wheel 6142, and the sliding groove is arranged at the opposite position of the end of the adjusting plate driving shaft 6141, so that when the adjusting plate driving wheel 6142 rotates, the adjusting plate driving shaft 6141 can be driven to slide relative to the air guide frame 611 through the movement of the driving wheel eccentric rod 6143.

[0066] The driving stopper is arranged on the adjusting plate driving shaft 6141 adjacent to the side of the air guide adjusting plate 613 corresponding to the air guide plate 612, so that when the adjusting plate driving shaft 6141 slides relative to the air guide frame 611, the air guide adjusting plate 613 can be pushed to rotate relative to the air guide plate 612 through the driving stopper, so as to adjust the outlet area of the air guide channel. The driving hole 6144 in polygonal shape is arranged on the rotating shaft of the adjusting plate driving wheel 6142, the driving hole 6144 is arranged through the rotating shaft of the adjusting plate driving wheel 6142, the wheel driving motor is arranged at the position opposite to the adjusting plate driving wheel 6142 on the top of the heating chamber 1, the wheel driving shaft penetrates the wall portion of the heating chamber 1 into the heating chamber 1 and is inserted into the driving hole 6144, the wheel driving motor is drivingly connected with the wheel driving shaft and is electrically connected with the controller 5, the wheel driving motor can be controlled to act through the controller 5, the adjusting plate driving wheel 6142 is driven to rotate through the wheel driving shaft, so as to adjust the outlet area of the air guide channel. The adjusting plate driving wheel 6142 can slide on the wheel driving shaft, which is beneficial to the free lifting of the air guide structure 61.

[0067] The three-way catalyst heating control method of the present application is used to control the three-way catalyst heating control system of any embodiment of the present application. As shown in the figure, Figure 7 The three-way catalyst heating control method of the present application comprises the following steps:

[0068] S10: Obtain the detection values of the hot air temperature sensor 132 and the exhaust air temperature sensor 42. The detection value of the hot air temperature sensor 132 reflects the actual temperature of the hot air entering the heating chamber 1 through the hot air input pipe 13, and the detection value of the exhaust air temperature sensor 42 reflects the actual temperature of the exhaust air after being heated by the three-way catalyst. The detection signals of the hot air temperature sensor 132 and the exhaust air temperature sensor 42 are transmitted to the controller 5, which obtains them as control parameters for its related actions.

[0069] S20: The controller 5 generates an output signal based on the detection signals of the exhaust air temperature sensor 42 and the hot air temperature sensor 132, and controls the action of the hot air flow control valve 131, thereby adjusting the flow of hot air passing through the hot air flow control valve 131.

[0070] Specifically, when the hot air temperature detected by the hot air temperature sensor 132 is greater than the set temperature required by the heating chamber 1, the hot air flow entering the heating chamber 1 can be adjusted according to the hot air temperature and the exhaust air temperature, thereby adjusting the ratio of the hot air flow and the exhaust air flow, so that the temperature of the circulating air formed by the mixture of hot air and exhaust air reaches or is slightly higher than the set temperature. This allows the temperature of the circulating air circulating to the product conveying belt 4 to reach the set temperature required for heating the three-way catalyst, without the need to start the heating pipe 31 to heat the circulating air, thereby reducing the energy consumption of the heating pipe 31.

[0071] When the hot air temperature detected by the hot air temperature sensor 132 is greater than the exhaust air temperature of the product conveying belt 4, but less than the set temperature of the heating chamber 1, the controller 5 adjusts the flow rate of the hot air flow control valve 131 to the maximum value, thereby increasing the temperature of the circulating air formed by the mixture of hot air and exhaust air as much as possible. This allows the temperature of the circulating air to be raised to the set temperature by the small power heating of the heating pipe 31, thereby reducing the energy consumption of the heating device.

[0072] When the hot air temperature detected by the hot air temperature sensor 132 is not greater than the exhaust air temperature of the product conveying belt 4, the input of hot air does not help to raise the temperature of the circulating air, and may even cause the temperature of the circulating air to drop. At this time, the controller 5 adjusts the flow rate of the hot air flow control valve 131 to the minimum value required to maintain the exhaust gas discharge in the heating chamber 1, thereby maximizing the energy consumption of the heating pipe 31 while maintaining the heating quality of the three-way catalyst.

[0073] S30: Obtain the detection value of the circulating air temperature sensor 33. The detection value of the circulating air temperature sensor 33 reflects the temperature of the circulating air when it reaches the heating pipe 31. The controller 5 can determine whether the heating pipe 31 needs to be started to heat the circulating air and the power required for heating the circulating air by obtaining the detection value of the circulating air temperature sensor 33.

[0074] S40: The controller 5 compares the detection value of the circulating air temperature sensor 33 with the set temperature, and when the detection value of the circulating air temperature sensor 33 is less than the set temperature, sends a control signal to the heating control unit 32 to start the heating pipe 31 to heat the circulating air, and controls the heating power of the heating pipe 31 according to the difference between the detection value of the circulating air temperature sensor 33 and the set temperature value, so that the temperature of the heated circulating air is stably maintained around the set temperature, forming a second level of adjustment of the circulating air temperature.

[0075] S50: Obtain the detection value of the inlet air temperature sensor 41. The detection value of the inlet air temperature sensor 41 reflects the temperature of the circulating air reaching the product conveying belt 4, that is, the actual heating temperature of the three-way catalyst. By obtaining the detection value of the inlet air temperature sensor 41, the temperature value of the three-way catalyst heating is obtained.

[0076] S60: The controller 5 sends a control signal according to the detection value of the inlet air temperature sensor 41 to the heating control unit 32, and adjusts the heating power of the heating pipe 31 through the heating control unit 32. In this way, the heating power of the heating pipe 31 can be adjusted according to the inlet air temperature, forming a third level of adjustment of the circulating air temperature.

[0077] Through the above three levels of adjustment, the circulating air temperature reaching the product conveying belt 4 can be better controlled, the three-way catalyst heating temperature can be accurately adjusted, the stability of the three-way catalyst heating temperature can be maintained, and the energy consumption of the heating control system of the application can be reduced.

[0078] In some embodiments of the three-way catalyst heating control method of the application, as shown in Figure 7 between S30 and S40, there is also a step: S35: Adjust the hot air flow control valve 131 according to the detection value of the circulating air temperature sensor 33, so that the flow of hot air flowing into the heating chamber 1 through the hot air input pipe 13 decreases as the detection value of the circulating air temperature sensor 33 increases, and increases as the detection value of the circulating air temperature sensor 33 decreases. In this way, while the heating device 3 is used to heat the circulating air and increase the circulating air temperature, the amount of hot air entering the heating chamber 1 through the hot air input pipe is also adjusted, forming a negative feedback adjustment of the circulating air temperature, so that the heat energy contained in the hot air is fully utilized, the stability of the circulating air temperature is maintained, and the energy consumption of the heating device 3 is further reduced.

[0079] In some embodiments of the three-way catalyst heating control method of the application, as shown in Figure 7As shown, the three-way catalyst heating control method of the present application further comprises the following step: S70: detecting the height of the three-way catalyst, and adjusting the lifting structure 62 according to the height of the three-way catalyst, so that the interval distance between the air guide structure 61 and the three-way catalyst is within the set range.

[0080] The detection of the height of the three-way catalyst can be performed before the three-way catalyst enters the heating chamber 1, or a detection window can be provided on the top or side wall of the heating chamber 1, and a detection sensor such as a laser radar is used to detect the three-way catalyst on the product conveying belt 4. According to the height of the three-way catalyst and the current position of the air guide structure 61, it can be determined whether the distance between the air guide structure 61 and the product conveying belt 4 can accommodate the three-way catalyst to pass through, and the interval distance between the air guide structure 61 and the top of the three-way catalyst can be obtained. According to the interval distance, the lifting structure 62 can be adjusted so that the interval distance between the air guide structure 61 and the top of the three-way catalyst is within the set range, so that the circulating air can blow at a certain speed to the three-way catalyst, improving the heating effect of the three-way catalyst.

[0081] In a preferred embodiment of the three-way catalyst heating control method of the present application, in S70, the interval distance between the air guide structure 61 and the top of the three-way catalyst is controlled to increase with the increase of the detection value of the inlet air temperature sensor 41 within the set range.

[0082] When the temperature of the circulating air reaching the product conveying belt 4 fluctuates slightly, the adjustment of the power of the heating device 3 is a kind of lagging adjustment, and cannot change the temperature of the circulating air that has reached the product conveying belt 4. At this time, the interval distance between the air guide structure 61 and the top of the three-way catalyst is adjusted, and when the temperature of the circulating air increases, the interval distance between the air guide structure 61 and the top of the three-way catalyst is increased, so that the flow rate of the circulating air blowing to the three-way catalyst is slowed down, the amount of circulating air penetrating into the pores of the three-way catalyst is reduced, and the heating effect of the three-way catalyst is maintained. Similarly, when the temperature of the circulating air decreases, the interval distance between the air guide structure 61 and the top of the three-way catalyst is shortened, so that the flow rate of the circulating air blowing to the three-way catalyst is increased, the amount of circulating air penetrating into the pores of the three-way catalyst is increased, and the stability of the heating effect of the three-way catalyst is maintained.

[0083] In some embodiments of the three-way catalyst heating control method of the present application, as shown, Figure 7 The three-way catalyst heating control method of the present application further comprises the following step: S80: the controller 5 controls the adjustment plate driving mechanism 614 according to the detection value of the inlet air temperature sensor 41, so that the outlet area of the air guide channel increases with the increase of the detection value of the inlet air temperature sensor 41, and decreases with the decrease of the detection value of the inlet air temperature sensor 41.

[0084] When the temperature of the circulating air increases, the temperature blown to the three-way catalyst increases, at this time, increasing the outlet area of the air guide passage can reduce the flow rate of the circulating air blown through the outlet of the air guide passage, so that the flow rate blown to the three-way catalyst is reduced, the amount of the circulating air penetrating into the pores of the three-way catalyst is reduced, and the heating effect of the three-way catalyst is maintained. Similarly, when the temperature of the circulating air decreases, by reducing the outlet area of the air guide passage, the flow rate of the circulating air blown through the outlet of the air guide passage can be increased, so that the flow rate of the circulating air blown to the three-way catalyst is increased, the amount of the circulating air penetrating into the pores of the three-way catalyst is increased, and the stability of the heating effect of the three-way catalyst is further maintained.

[0085] In the description of the present application, the description of the terms "one embodiment", "specific embodiment", "preferred embodiment" and the like 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 application. In the present application, the illustrative description 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 any one or more embodiments or examples in a suitable manner.

[0086] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A three-way catalyst heating control system characterized by: The utility model relates to a heating chamber (1), circulating wind drive arrangement (2), heating device (3), product conveyor belt (4), controller (5) and air guide device (6), the heating chamber (1) includes the hot air circulation cavity (11) and product heat receiving cavity (12) that the upper and lower two ends are connected, the lower part of product heat receiving cavity (12) is provided with hot air input pipe (13), and the hot air input pipe (13) is provided with hot air flow control valve (131) and hot air temperature sensor (132), the upper part of product heat receiving cavity (12) is provided with exhaust pipe (14), circulating wind drive arrangement (2) sets up in the lower part of hot air circulation cavity (11) to can drive the gas in heating chamber (1) to the upper portion of hot air circulation cavity (11) flow, heating device (3) sets up in the upper portion of hot air circulation cavity (11), including heating pipe (31), heating control unit (32) and circulating air temperature sensor (33), heating control unit (32) is electrically connected with heating pipe (31), product conveyor belt (4) sets up in the middle part of product heat receiving cavity (12), the upper of product conveyor belt (4) is provided with air inlet temperature sensor (41), and the lower is provided with air outlet temperature sensor (42), hot air flow control valve (131), hot air temperature sensor (132), heating control unit (32), circulating air temperature sensor (33), air inlet temperature sensor (41) and air outlet temperature sensor (42) are electrically connected with controller (5), air guide device (6) sets up in product heat receiving cavity (12) the upper of product conveyor belt (4), air guide device (6) includes air guide structure (61) and lifting structure (62), air guide structure (61) includes air guide frame (611) and a plurality of air guide plate (612), a plurality of air guide plate (612) are spaced apart and set up in the inside of air guide frame (611), adjacent air guide plate (612) between, or air guide plate (612) and air guide frame (611) between form air guide passage, the import area of air guide passage is greater than the export area, air guide frame (611) is connected with lifting structure (62), lifting structure (62) is electrically connected with controller (5); Air guide structure (61) still includes air guide adjusting plate (613) and adjusting plate drive mechanism (614), air guide adjusting plate (613) sets up in one side of air guide plate (612), and can rotate under the drive of adjusting plate drive mechanism (614), to can change the export area of air guide passage, adjusting plate drive mechanism (614) is electrically connected with controller (5), and the controller (5) controls adjusting plate drive mechanism (614) according to the detection value of air inlet temperature sensor (41).

2. The three-way catalyst heating control system according to claim 1, characterized by: The circulating air driving device (2) comprises a moving seat (21), a circulating air motor (22), a circulating transmission shaft (23), a heat insulation body (24) and a heat-resistant wind wheel (25), the circulating air motor (22) is connected with the circulating transmission shaft (23), the circulating transmission shaft (23) is arranged on the moving seat (21), the heat insulation body (24) is fixed on one end of the moving seat (21), the circulating transmission shaft (23) passes through the heat insulation body (24) and is connected with the heat-resistant wind wheel (25), the sidewall of the heating chamber (1) is provided with a driving window hole, the circulating air driving device (2) can move along the direction of the driving window hole, so that the heat insulation body (24) can close the driving window hole.

3. The three-way catalyst heating control system according to claim 1, characterized by: The heating control unit (32) comprises a control module (321) and a power processing module (322), the control module (321) is electrically connected with the power processing module (322) and a controller (5), the power processing module (322) is electrically connected with the heating pipe (31), the control module (321) can form a pulse control signal with different duty cycles under the control of the controller (5), and the power processing module (322) can form a pulse power with different duty cycles under the control of the pulse control signal.

4. The three-way catalyst heating control system according to claim 1, characterized by: The adjusting plate driving mechanism (614) comprises an adjusting plate driving shaft (6141) and an adjusting plate driving wheel (6142), a driving wheel fixing frame (6112) is arranged on one side of the air guide frame (611), a rotating shaft of the adjusting plate driving wheel (6142) is installed on and can rotate on the driving wheel fixing frame (6112), the adjusting plate driving shaft (6141) is arranged perpendicularly to the air guide plate (612) and the air guide adjusting plate (613), a driving shaft passing hole is arranged at a relative position of the air guide plate (612) and the air guide adjusting plate (613), the adjusting plate driving shaft (6141) is slidingly installed on the air guide frame (611) through the driving shaft passing hole and extends out of the air guide frame (611) to the adjusting plate driving wheel (6142), a driving wheel eccentric rod (6143) is arranged at an edge portion of the adjusting plate driving wheel (6142), a sliding groove is arranged at a relative position of an end portion of the adjusting plate driving shaft (6141), when the adjusting plate driving wheel (6142) rotates, the adjusting plate driving shaft (6141) can be driven to slide relative to the air guide frame (611) through movement of the driving wheel eccentric rod (6143); the air guide adjusting plate (613) is arranged adjacent to one side of the corresponding air guide plate (612) on the adjusting plate driving shaft (6141), when the adjusting plate driving shaft (6141) slides relative to the air guide frame (611), the air guide adjusting plate (613) can be driven to rotate relative to the air guide plate (612) through the driving stop piece, so as to adjust an outlet area of the air guide passage; a polygonal driving hole (6144) is arranged on a rotating shaft of the adjusting plate driving wheel (6142), the driving hole (6144) is arranged through the rotating shaft of the adjusting plate driving wheel (6142), a wheel driving motor is arranged at a position opposite to the adjusting plate driving wheel (6142) on the top of the heating chamber (1), a wheel driving shaft penetrates a wall portion of the heating chamber (1) into the heating chamber (1) and is inserted into the driving hole (6144), the wheel driving motor is drivingly connected with the wheel driving shaft and is electrically connected with the controller (5).

5. A control method of the three-way catalyst heating control system according to any one of claims 1 to 4, characterized by: The method comprises the following steps: S10: acquiring detection values of the hot air temperature sensor (132) and the outlet air temperature sensor (42); S20: adjusting the flow of the hot air flow control valve (131) according to the detection values of the outlet air temperature sensor (42) and the hot air temperature sensor (132); S30: acquiring a detection value of the circulating air temperature sensor (33); S40: when the detection value of the circulating air temperature sensor (33) is less than a set temperature, controlling the heating device (3) to heat the circulating air; S50: acquiring a detection value of the inlet air temperature sensor (41); S60: The heating control unit (32) is controlled based on the detection value of the intake air temperature sensor (41) to adjust the heating power of the heating pipe (31).

6. The method of claim 5, wherein: Further comprising steps of: S35: The hot air flow control valve (131) is adjusted based on the detection value of the circulating air temperature sensor (33) to reduce the hot air flow rate flowing through the hot air input pipe (13) as the detection value of the circulating air temperature sensor (33) increases.

7. The method according to claim 5 or 6, characterized in that: Further comprising steps of: S70: The height of the three-way catalyst is detected, and the lifting structure (62) is adjusted based on the height of the three-way catalyst to keep the interval distance between the air guide structure (61) and the three-way catalyst within a set range.

8. The method of claim 7, wherein: In S70, the interval distance is controlled to increase as the detection value of the intake air temperature sensor (41) increases.

9. The method of claim 7, wherein: Further comprising steps of: S80: The adjustment plate driving mechanism (614) is controlled based on the detection value of the intake air temperature sensor (41) to increase the outlet area of the air guide passage as the detection value of the intake air temperature sensor (41) increases.

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