Icing identification method and device for gas inlet pipeline and gas vehicle

Abstract

The invention discloses an icing recognition method and device for a gas inlet pipeline and a gas vehicle, the method is suitable for recognizing the icing condition of the gas inlet pipeline of a gas engine, and the method comprises the steps that whether the gas vehicle has a fault code or not is monitored; when it is monitored that the gas vehicle does not have the fault code, the first gas inlet pressure, the first rotating speed and the first gas inlet temperature of a gas engine under the neutral gear sliding working condition of the gas vehicle are obtained; and when it is determined that the first gas inlet temperature is smaller than the preset second gas inlet temperature, the first gas inlet pressure is lower than the second gas inlet pressure of the gas engine under the stable idling working condition of the gas vehicle, and the first rotating speed is lower than the preset second rotating speed, it is judged that freezing exists in the position of a throttle valve in the gas inlet pipeline. Torsion limiting and flameout caused by freezing in the air inlet pipeline in the driving process can be accurately recognized.

Description

Technical Field

[0001] This invention relates to the field of intake pipe fault identification technology, and in particular to a method, device and gas vehicle for identifying icing in intake pipes. Background Technology

[0002] Vehicles that use natural gas as fuel will produce a large amount of water after the fuel is burned. Although most of the water is discharged with the exhaust gas, some of it enters the intake manifold through the engine's breathing system.

[0003] When natural gas vehicles operate in low-temperature environments, water entering different parts of the intake system—including the intercooler, outlet pipe, throttle valve, and intake manifold—through the closed-loop recirculation system inevitably freezes upon encountering cold air. The location and amount of icing in the intake system can lead to issues such as torque limitation, malfunctions, insufficient boost pressure, and even engine stalling, causing unnecessary trouble for customers. Especially after stalling, the lack of power steering makes it difficult for the driver to control the vehicle, increasing the risk of traffic accidents. This is particularly true for vehicles with the current design featuring a large, open grille at the front, which exacerbates these problems in low winter temperatures.

[0004] In low-temperature driving conditions, one method to determine whether insufficient power, low boost pressure, or even engine stalling is caused by icing in the intake system is disassembly and inspection. This involves disassembling and inspecting the intake piping, including the intercooler, intercooler outlet pipe, throttle body, mixer, and intake manifold, among other components. This method involves many parts and is cumbersome, and it cannot quickly pinpoint the location of the ice buildup. Another method is to drive the vehicle into a heated storage room for de-icing. After several hours, the melted water will drain out through the drain hole. The volume of water can be used to determine the extent of ice buildup, but this still cannot pinpoint the exact location of the ice. Summary of the Invention

[0005] This invention provides a method, device, and gas-powered vehicle for identifying icing in the intake manifold, which can accurately identify torque limitation and engine stalling caused by icing in the intake manifold during driving.

[0006] In a first aspect, embodiments of the present invention provide a method for identifying icing in an intake manifold, characterized in that it is applicable to identifying icing conditions in the intake manifold of a gas engine, the method comprising:

[0007] Monitor for fault codes in gas-powered vehicles;

[0008] When no fault code is detected in the gas vehicle, the first intake pressure, first speed and first intake temperature of the gas engine are obtained when the gas vehicle is coasting in neutral.

[0009] When it is determined that the first intake temperature is less than a preset second intake temperature, the first intake pressure is lower than a second intake pressure of the gas engine of the gas vehicle in a steady idle operating condition, and the first rotation speed is lower than a preset second rotation speed, it is determined that the position of the throttle valve in the intake pipeline is frozen.

[0010] Optionally, after the monitoring of whether the gas vehicle has a fault code, the method further comprises:

[0011] When it is monitored that the gas vehicle has a throttle valve sticking fault code, and it is excluded that the throttle valve body has a fault, a third rotation speed of the gas engine and an actual opening degree of the throttle valve when the accelerator is stepped on are obtained.

[0012] When it is monitored that the third rotation speed fluctuates and the actual opening degree of the throttle valve cannot follow the set opening degree, it is determined that the position of the throttle valve in the intake pipeline is frozen.

[0013] Optionally, the excluding of the fault of the throttle valve body comprises:

[0014] A zero voltage of the gas vehicle in a steady idle operating condition is obtained.

[0015] When it is detected that the zero voltage of the gas vehicle in the steady idle operating condition is less than or equal to a preset zero voltage value, it is excluded that the throttle valve body has a fault.

[0016] Optionally, after the monitoring of whether the gas vehicle has a fault code, the method further comprises:

[0017] When it is monitored that the gas vehicle has a low supercharging pressure fault code, and it is excluded that the supercharger has a deterioration fault and it is excluded that the intake pipeline has a leakage fault, it is determined that the position of the intercooler, or the outlet pipe of the intercooler, or the intake manifold of the gas engine is frozen.

[0018] Optionally, the excluding of the deterioration fault of the supercharger and the excluding of the leakage fault of the intake pipeline comprise:

[0019] The state of an electronically controlled blow-off valve of the gas engine and an actual value of the supercharging pressure are obtained.

[0020] According to the following of the actual value of the supercharging pressure and a set value, the deterioration fault of the supercharger and the leakage fault of the intake pipeline are excluded.

[0021] Optionally, after the monitoring of whether the gas vehicle has a fault code, the method further comprises:

[0022] When it is detected that a fault code other than the throttle valve sticking fault code and the low supercharging pressure fault code is detected, the corresponding fault is excluded.

[0023] In a second aspect, the embodiment of the present application further provides an icing identification device for an air intake pipeline, comprising:

[0024] a fault code monitoring module configured to monitor whether a gas vehicle has a fault code;

[0025] a data acquisition module configured to acquire an intake pressure, a speed of a gas engine and an intake temperature of the gas vehicle under a neutral coasting condition when the fault code monitoring module monitors that the gas vehicle has no fault code;

[0026] an icing determination module configured to determine that icing occurs at a position of a throttle valve in the air intake pipeline when it is determined that the intake temperature is less than 0 degree, the first intake pressure of the gas vehicle under the neutral coasting condition is lower than a second intake pressure of the gas vehicle under a stable idle condition, and the speed of the gas engine is lower than a preset speed.

[0027] Optionally, the data acquisition module is further configured to acquire a third speed of the gas engine and an actual opening degree of the throttle valve when a pedal is stepped after it is monitored that the gas vehicle has a throttle valve sticking fault code and it is excluded that the throttle valve body has a fault.

[0028] The icing determination module is further configured to determine that the position of the throttle valve in the air intake pipeline has icing when it is monitored that the third speed fluctuates and the actual opening degree of the throttle valve cannot follow a set opening degree.

[0029] Optionally, the icing determination module is further configured to determine that an intercooler, or an air outlet pipe of the intercooler, or an intake manifold of the gas engine has icing after it is monitored that the gas vehicle has a low boost pressure fault code and it is excluded that a supercharger has a deterioration fault and it is excluded that the air intake pipeline has a leakage fault.

[0030] In a third aspect, the embodiment of the present application further provides a gas vehicle comprising a gas engine, wherein the gas vehicle uses the icing identification method for the air intake pipeline according to the first aspect to identify icing of an air intake pipeline of the gas engine.

[0031] The embodiment of the application discloses a kind of icing identification method, device and gas vehicle of air intake pipeline, which is suitable for identifying icing condition of air intake pipeline of gas engine, method includes: monitoring whether gas vehicle exists fault code;When monitoring that gas vehicle does not exist fault code, obtain the first air intake pressure, first speed and first air intake temperature of gas engine of gas vehicle under the condition of neutral coasting;When determining that the first air intake temperature is less than the second preset air intake temperature, the first air intake pressure is lower than the second air intake pressure of gas engine of gas vehicle under the condition of stable idle speed, and the first speed is lower than the second preset speed, determine that there is icing in the position of air intake pipeline throttle valve.This embodiment is based on existing engine electronic control parameter, accurately identifies that engine speed is low and vehicle is shut down during driving in low temperature environment due to icing of air intake pipeline, provides theoretical basis for quickly determining whether limited torque and shutdown due to icing of air intake pipeline and icing position, more effectively solves the problem of insufficient market power and abnormal shutdown.Service station maintenance personnel and market service support personnel directly and accurately judge relevant problems and methods, improve the efficiency of problem solving and customer satisfaction.Reduce the probability that the vehicle loses power steering, auxiliary braking and other key functions due to engine abnormal shutdown, which can reduce the incidence of traffic accidents.Reduce the problem of fault and shutdown, which can avoid wear and tear caused by abnormal engine shutdown, prolong the service life of engine and supporting components.

[0032] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0034] Figure 1 is a flow chart of a kind of icing identification method of air intake pipeline provided by the embodiment of the application;

[0035] Figure 2 is a flow chart of another icing identification method of air intake pipeline provided by the embodiment of the application;

[0036] Figure 3 is a structure schematic view of an air intake pipeline icing identification device provided by the embodiment of the application. DETAILED DESCRIPTION

[0037] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of embodiments of the present application, rather than all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work should fall within the protection scope of the present application.

[0038] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices.

[0039] Figure 1 is a flow chart of an ice identification method for an air intake pipeline provided by an embodiment of the present application. The embodiment can be applicable to identifying icing conditions of an air intake pipeline of a gas engine. The method can be executed by an ice identification device for an air intake pipeline, which can be realized in the form of hardware and / or software.

[0040] With reference to Figure 1 The method comprises the following steps:

[0041] S110, monitoring whether there is a fault code in the gas vehicle.

[0042] The fault code of the gas vehicle can include a throttle sticking fault code, a low boost pressure fault code and other types of fault codes.

[0043] S120, when it is monitored that there is no fault code in the gas vehicle, acquiring a first intake pressure, a first rotation speed and a first intake temperature of the gas engine under a neutral coasting condition of the gas vehicle.

[0044] It should be noted that the neutral coasting condition is a condition in which the vehicle is running, the gearbox is switched to neutral (N), the engine is not power transmitted with the vehicle, and the vehicle is coasting forward relying on the inertia of the vehicle. The first intake pressure is the pressure of the intake manifold of the gas engine of the gas vehicle under the neutral coasting condition. The first rotation speed is the rotation speed of the gas engine of the gas vehicle under the neutral coasting condition. The first intake temperature is the temperature at the gas inlet of the gas engine of the gas vehicle under the neutral coasting condition. When judging the icing condition of the throttle valve position in the intake pipeline, the gas vehicle needs to be tested under the neutral coasting condition, and parameters such as intake pressure, engine rotation speed, ambient temperature and intake temperature need to be observed.

[0045] S130, when it is determined that the first intake temperature is less than the preset second intake temperature, the first intake pressure is lower than the second intake pressure of the gas engine of the gas vehicle under the stable idle condition, and the first rotation speed is lower than the preset second rotation speed, it is determined that the throttle valve position in the intake pipeline is iced.

[0046] It should be noted that the second intake pressure is the intake pressure of the intake manifold of the gas engine of the gas vehicle under the stable idle condition. The second rotation speed can be set to 400 rpm or less, and the second intake temperature can be set to 0 degrees. When the first intake temperature is equal to 0 degrees, it can be determined that the throttle valve position in the intake pipeline is iced, thereby causing misfire.

[0047] It can be understood that the icing of the intake system is one of the influencing factors of the abnormal torque limiting and misfire of the vehicle. The embodiment of the present application is based on the existing engine electronic control parameters, and accurately identifies the problems of low engine rotation speed and vehicle misfire caused by the icing of the intake pipeline during the driving of the vehicle in a low-temperature environment, provides a theoretical basis for quickly determining whether the torque limiting and misfire are caused by the icing of the intake pipeline and the icing position, and more effectively solves the problems of insufficient power and abnormal misfire in the market. Service station maintenance personnel and market service support personnel directly and accurately judge the related problems and methods, improve the efficiency of problem solving and customer satisfaction. The probability that the vehicle loses power steering, auxiliary braking and other key functions due to the abnormal misfire of the engine caused by icing is reduced, and the traffic accident rate is reduced. Reducing the fault and misfire problems can avoid the wear caused by the abnormal misfire of the engine, and prolong the service life of the engine and the matching components.

[0048] Figure 2 is a flow chart of another method for identifying icing of an intake pipeline provided by the embodiment of the present application, referring to Figure 2 The method comprises the following steps:

[0049] S210, monitoring whether the gas vehicle has a fault code.

[0050] S221, when it is monitored that the gas vehicle does not exist a fault code, obtaining the first intake pressure, the first rotating speed and the first intake temperature of the gas engine under the condition of the gas vehicle in the neutral gear sliding.

[0051] S231, when it is determined that the first intake temperature is less than the preset second intake temperature, the first intake pressure is lower than the second intake pressure of the gas engine under the condition of the gas vehicle in the stable idle speed, and the first rotating speed is lower than the preset second rotating speed, it is determined that the position of the throttle valve in the intake pipeline exists icing.

[0052] Optionally, on the basis of the above embodiment, after step S210, it further comprises:

[0053] S222, when it is monitored that the gas vehicle exists a throttle valve sticking fault code, and after excluding that the throttle valve body exists a fault, obtaining the third rotating speed of the gas engine and the actual opening degree of the throttle valve when the accelerator is stepped on.

[0054] It should be noted that whether the third rotating speed of the gas engine and the actual opening degree of the throttle valve when the accelerator is stepped on follow the set opening degree can be used to determine whether the position of the throttle valve is frozen and stuck.

[0055] S232, when it is monitored that the third rotating speed fluctuates and the actual opening degree of the throttle valve cannot follow the set opening degree, it is determined that the position of the throttle valve in the intake pipeline exists icing.

[0056] It should be noted that after excluding that the throttle valve body exists a fault, from the data analysis aspect, when the third rotating speed fluctuates and the actual opening degree of the throttle valve cannot follow the set opening degree, it can be determined that the position of the throttle valve in the intake pipeline exists icing. From the whole vehicle performance, the gas engine does not respond when the accelerator is stepped on.

[0057] Optionally, on the basis of the above embodiment, excluding that the throttle valve body exists a fault comprises: obtaining the zero voltage of the gas vehicle under the condition of the stable idle speed; when it is detected that the zero voltage of the gas vehicle under the condition of the stable idle speed is less than or equal to the preset zero voltage value, it is excluded that the throttle valve body exists a fault.

[0058] It should be noted that the zero voltage is the output voltage of the vehicle at idle. If the throttle valve body exists a fault, the resistance will become larger, and the zero voltage will also increase accordingly. When it is detected that the zero voltage of the gas vehicle under the condition of the stable idle speed is less than or equal to the preset zero voltage value, the phenomenon that the gas vehicle exists a throttle valve sticking fault code caused by the throttle valve body problem can be excluded.

[0059] The embodiment of the application can accurately identify the condition that the throttle valve is stuck due to the icing of the intake pipeline during the driving of the vehicle in a low-temperature environment based on the existing engine electronic control parameters.

[0060] Optionally, based on the above embodiment, after step S210, further comprising:

[0061] S223, when the supercharged pressure low fault code of the gas vehicle is monitored, and the supercharger exists deterioration fault and the air intake pipeline exists leakage fault are excluded, it is determined that the intercooler, or the outlet pipe of the intercooler, or the position of the air intake manifold of the gas engine exists icing.

[0062] Optionally, based on the above embodiment, excluding the supercharger exists deterioration fault and the air intake pipeline exists leakage fault comprises: obtaining the state of the electronic control exhaust valve of the gas engine and the actual value of the supercharged pressure; according to the following of the actual value of the monitored supercharged pressure and the set value, the supercharger exists deterioration fault and the air intake pipeline exists leakage fault are excluded.

[0063] It should be noted that the performance of the supercharger exists deterioration fault is that the actual pressure is low in all working conditions (low / middle / high load), especially when the high load is greater, the opening degree of the electronic control exhaust valve is normal (ECU correct control), but the supercharger cannot effectively improve the pressure. The performance of the air intake pipeline exists leakage fault is that the actual pressure drops sharply when the high load is high, and the pressure may be normal when the idling or low load is low (the leakage amount is small, which does not affect the low demand scene). When the supercharged pressure low fault code of the gas vehicle is monitored, and the supercharger exists deterioration fault and the air intake pipeline exists leakage fault are excluded, it can be determined that the intercooler, or the outlet pipe of the intercooler, or the position of the air intake manifold of the gas engine exists icing.

[0064] The embodiment of the application can accurately identify the low supercharged pressure caused by icing of the air intake pipeline of the vehicle in a low temperature environment based on the existing engine electronic control parameters.

[0065] Optionally, based on the above embodiment, after step S210, further comprising:

[0066] S224, when the fault code other than the throttle valve sticking fault code and the supercharged pressure low fault code is detected, the corresponding fault is excluded.

[0067] It can be understood that when the fault code other than the throttle valve sticking fault code and the supercharged pressure low fault code is detected, the corresponding fault is excluded, which can avoid the influence of other types of faults on identifying the icing position.

[0068] In summary, the embodiment of the present application is based on the existing engine electronic control parameters, and accurately identifies the problems of low engine speed, vehicle stalling, throttle sticking and low boost pressure caused by icing of the intake pipeline during vehicle driving in a low-temperature environment, provides a theoretical basis for quickly determining whether the torque limiting and stalling caused by the icing of the intake pipeline and the icing position, and more effectively solves the problems of insufficient power and abnormal stalling in the market. Service station maintenance personnel and market service support personnel can directly and accurately judge the related problems and methods, improve the efficiency of problem solving and customer satisfaction. The probability of vehicle losing power steering, auxiliary braking and other key functions caused by abnormal stalling of the engine due to icing is reduced, and the incidence of traffic accidents is reduced. The failure and stalling problems are reduced, wear caused by abnormal stalling of the engine is avoided, and the service life of the engine and the matching components is prolonged. In addition, when detecting fault codes other than the throttle sticking fault code and the low boost pressure fault code, the corresponding faults are excluded, and the influence of other types of faults on identifying the icing position can be avoided.

[0069] Figure 3 is a structural schematic diagram of an icing identification device for an intake pipeline provided by the embodiment of the present application, referring to Figure 3 The device comprises a fault code monitoring module 310, a data acquisition module 320 and an icing determination module 330.

[0070] In the embodiment of the present application, the fault code monitoring module 310 is configured to monitor whether the gas vehicle has a fault code; the data acquisition module 320 is configured to acquire the intake pressure of the gas vehicle under the neutral coasting condition, the speed of the gas engine and the intake temperature when the fault code monitoring module monitors that the gas vehicle has no fault code; and the icing determination module 330 is configured to determine that the throttle position in the intake pipeline is iced when it is determined that the intake temperature is less than 0 degrees, the first intake pressure of the gas vehicle under the neutral coasting condition is lower than the second intake pressure of the gas vehicle under the stable idle speed condition, and the speed of the gas engine is lower than the preset speed.

[0071] Optionally, on the basis of the above-mentioned embodiment, the data acquisition module 320 is further configured to acquire the third speed of the gas engine and the actual opening degree of the throttle when the accelerator is depressed after monitoring that the gas vehicle has a throttle sticking fault code and excluding that the throttle body has a fault; and the icing determination module 330 is further configured to determine that the throttle position in the intake pipeline is iced when it is monitored that the third speed fluctuates and the actual opening degree of the throttle cannot follow the set opening degree.

[0072] Optionally, on the basis of the above-mentioned embodiment, the icing determination module 330 is further configured to determine that the position of the intercooler, or the outlet pipe of the intercooler, or the intake manifold of the gas engine is iced after monitoring that the gas vehicle has a low boost pressure fault code and excluding that the supercharger has a deterioration fault and excluding that the intake pipeline has a leakage fault.

[0073] The ice identification device for the air intake pipeline provided by the embodiments of the present application can execute the ice identification method for the air intake pipeline provided by any of the embodiments of the present application, and has the function modules and beneficial effects corresponding to the execution method. The content not described in detail in the embodiments of the present application can refer to the ice identification method provided by the above embodiments.

[0074] The embodiments of the present application further provide a gas vehicle including a gas engine; the gas vehicle uses the ice identification method for the air intake pipeline provided by the above embodiments to identify the icing condition of the air intake pipeline of the gas engine.

[0075] It should be understood that the steps can be reordered, added or deleted using the various forms of flowcharts shown above. For example, each step described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0076] The above specific embodiments do not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for identifying icing in an air intake pipe, characterized in that, A method for identifying icing in the intake manifold of a gas engine, comprising: Monitor for fault codes in gas-powered vehicles; When no fault code is detected in the gas vehicle, the first intake pressure, first speed and first intake temperature of the gas engine are obtained when the gas vehicle is coasting in neutral. When it is determined that the first intake air temperature is less than the preset second intake air temperature, the first intake air pressure is lower than the second intake air pressure of the gas engine under stable idling conditions of the gas vehicle, and the first speed is lower than the preset second speed, it is determined that there is ice at the throttle position in the intake pipe.

2. The method for identifying icing in the intake pipe according to claim 1, characterized in that, After monitoring for fault codes in gas-powered vehicles, the following is also included: When a throttle valve sticking fault code is detected in the gas vehicle and the throttle valve body is ruled out as faulty, the third speed of the gas engine and the actual opening of the throttle valve are obtained when the accelerator pedal is pressed. When the third speed fluctuation is detected and the actual opening of the throttle valve cannot follow the set opening, it is determined that there is ice at the throttle valve position in the intake pipe.

3. The method for identifying icing in the intake pipe according to claim 2, characterized in that, Troubleshooting the throttle body for malfunctions includes: Obtain the zero-position voltage of the gas-powered vehicle under stable idling conditions; When the zero-position voltage of the gas-powered vehicle under stable idling conditions is detected to be less than or equal to the preset zero-position voltage value, the throttle body is ruled out as having a fault.

4. The method for identifying icing in the intake pipe according to claim 1, characterized in that, After monitoring for fault codes in gas-powered vehicles, the following is also included: When a low boost pressure fault code is detected in the gas-powered vehicle, and after ruling out turbocharger deterioration and intake pipe leakage, it is determined that there is icing in the intercooler, the intercooler's outlet pipe, or the gas engine's intake manifold.

5. The method for identifying icing in the intake pipe according to claim 1, characterized in that, Troubleshooting turbocharger deterioration and intake line leaks includes: Obtain the status of the electronically controlled vent valve of the gas engine and the actual value of the boost pressure; Based on the monitoring of the actual value of the boost pressure and its correlation with the set value, the possibility of turbocharger deterioration and intake pipe leakage can be ruled out.

6. The method for identifying icing in the intake pipe according to claim 1, characterized in that, After monitoring for fault codes in natural gas vehicles, the process also includes: When a fault code other than the throttle valve sticking fault code and low boost pressure fault code is detected, troubleshoot the corresponding fault.

7. An icing detection device for an air intake pipe, characterized in that, include: The fault code monitoring module is used to monitor whether there are fault codes in gas-powered vehicles; The data acquisition module is used to acquire the intake pressure, engine speed and intake temperature of the gas vehicle under neutral coasting conditions when the fault code monitoring module detects that there is no fault code in the gas vehicle. The icing detection module is used to determine that icing has occurred at the throttle position in the intake pipe when the intake air temperature is less than 0 degrees, the first intake pressure of the gas vehicle in neutral coasting condition is lower than the second intake pressure of the gas vehicle in stable idling condition, and the speed of the gas engine is lower than a preset speed.

8. The icing detection device for the intake pipe according to claim 7, characterized in that, The data acquisition module is also used to acquire the third speed of the gas engine and the actual opening of the throttle when the gas vehicle is pressed after detecting a throttle sticking fault code and ruling out a fault in the throttle body. The icing determination module is also used to determine that there is icing at the throttle position in the intake pipe when the third speed fluctuation is detected and the actual opening of the throttle cannot follow the set opening.

9. The icing detection device for the intake pipe according to claim 7, characterized in that, The icing determination module is also used to determine that icing exists in the intercooler, the outlet pipe of the intercooler, or the intake manifold of the gas engine when a low boost pressure fault code is detected in the gas vehicle, and after ruling out a deterioration fault in the turbocharger and a leak fault in the intake pipe.

10. A gas-powered vehicle, characterized in that, The gas-powered vehicle uses the icing identification method for the intake pipe of the gas-powered engine as described in any one of claims 1 to 6 to identify the icing status of the intake pipe.

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