Independent warm air control method for hazardous chemical substance tractor and hazardous chemical substance tractor

Abstract

The invention discloses an independent warm air control method for a hazardous chemical tractor and the hazardous chemical tractor, and belongs to the field of special vehicles. According to the technical scheme, the independent warm air control method for the hazardous chemical tractor comprises a starting and stopping control process and a working standby control process, in the starting and stopping control process, starting, running or stopping of an engine is judged according to the rotating speed state of the engine, and when it is judged that the engine is in the starting and running states, a heater is started; and when it is judged that the engine is in the stop state, the heater is closed and enters the to-be-started state. According to the scheme, starting and stopping of the heater are controlled according to the rotating speed state of the engine, forced stopping of the heater during flameout of the engine can be automatically and accurately achieved, the neglect situation possibly caused by manual operation of a driver and passengers is avoided, and the safety of hazardous chemical substance transportation is improved; meanwhile, the operation gear of the heater is switched according to the difference value between the target temperature and the current temperature, the temperature in a cab can be more comfortable, and energy consumption is reasonably adjusted.

Description

Technical Field

[0001] This invention relates to the field of special vehicles, and in particular to an independent heating control method for a hazardous chemical tractor and a hazardous chemical tractor. Background Technology

[0002] Tractor tractors are commonly used in freight transport, providing power to the trailer that carries the cargo. They consist of an engine, chassis, cab, and electrical equipment. They can be divided into semi-trailer tractors and full-trailer tractors. A semi-trailer tractor has a towing saddle mounted on its frame, on which the front of the trailer rests, and the rear axle of the tractor bears part of the trailer's weight. In a full-trailer tractor, the front of the trailer is attached to the rear of the tractor, and the tractor only provides pulling force and does not bear the weight of the trailer.

[0003] Tractor-trailer cabs are typically equipped with heating systems to warm the interior and ensure a comfortable driving experience in cold conditions. For traditional fuel-powered vehicles, heating systems generally come in three types: water-based, air-based, and fuel-fired air-based. Water-based systems draw heat from heated engine coolant, air-based systems from engine exhaust, and fuel-fired air-based systems from the heat of fuel combustion, heating the air and then delivering it into the cab. Because tractor-trailer drivers need to rest inside the vehicle during long-haul freight trips, and fuel-fired air-based heating systems can be used even when the engine is off, they are far more commonly used in tractor-trailers than the other two types.

[0004] When the cargo is hazardous chemicals, for safety reasons, the heating system must be stopped from supplying air to the cab simultaneously when the engine is turned off (the driver and passengers can then restart the heating system independently). However, current hazardous chemical tractor units are interchangeable with other tractor units, requiring only structural differentiation for the cargo in the loading section of the trailer. The heating system is located on the tractor unit, i.e., the cab. Therefore, stopping the heating system simultaneously must be done by the driver and passengers themselves, and this step is at risk of being overlooked. Summary of the Invention

[0005] This invention addresses the need for automatic heater shutdown in hazardous chemical tractor vehicles when the engine stops, by providing an independent heating control method for such vehicles.

[0006] To achieve the above objectives, the technical solution adopted by this invention is an independent heating control method for a hazardous chemical tractor unit, comprising a start-stop control process and a work standby control process: In the start-stop control process, the engine's start, operation, or stop status is determined based on the engine speed; when the engine is determined to be in a start or operation state, the heater is turned on; when the engine is determined to be in a stop state, the heater is turned off and enters a standby state; In the work standby control process, a target temperature is set, and the heater's operating level is switched based on the difference between the current temperature and the target temperature. This independent heating control method controls the heater's on / off status based on the engine speed, automatically and accurately achieving forced shutdown of the heater when the engine is turned off, avoiding potential oversights due to manual operation by the driver and passengers, and improving the safety of hazardous chemical transportation; simultaneously, switching the heater's operating level based on the difference between the target temperature and the current temperature makes the cab temperature more comfortable and rationally regulates energy consumption, improving the efficiency and comfort of the heating system.

[0007] As a preferred implementation of an independent heating control method for hazardous chemical tractor-trailers, the start-stop control process includes: SA1. Determining if the engine speed is 0; if 0, the heater is turned off and manually turned on by the driver / passenger; if not 0, proceeding to SA2; SA2. Determining if the engine speed is greater than a first set speed value; if yes, heating is started; if no, proceeding to SA3; SA3. Determining if the engine speed is within a first speed range; if yes, proceeding to SA4; if no, proceeding to SA5; SA4. Waiting for the engine to start or stop; SA5. Determining if the engine speed is less than a second set speed value; if no, proceeding to SA6; if yes, proceeding to SA3; SA6. The heater is turned off. This refined engine speed determination process allows for more precise control of the heater's start and stop, preventing unnecessary starting or stopping of the heater when the engine is unstable. This further improves the accuracy and reliability of the heating system control, enhances safety during hazardous chemical transportation, and reduces potential risks caused by improper heating system control.

[0008] As a preferred implementation of an independent heating control method for hazardous chemical tractor-trailers, the first set speed value is the large end of a first speed range, and the second set speed value is the small end of the first speed range. The first and second set speed values, along with the endpoints of the first speed range, make the engine speed judgment standard clearer and more consistent, facilitating accurate system judgment of the engine status and precise control of the heater operation, thus improving the operability and stability of the entire independent heating control method.

[0009] As a preferred implementation of an independent warm air control method for a hazardous chemical tractor, the first set rotational speed value is 350 rpm, and the second set rotational speed value is 250 rpm.

[0010] As a preferred implementation of an independent warm air control method for a hazardous chemical tractor, in step SA2, it is judged whether the independent warm air control panel is turned on. If so, the subsequent steps are executed; if not, the start / stop control process is aborted; in step SA5, in parallel with whether the engine speed is less than the second set rotational speed value, if the engine start message signal is not received within a certain period of time, SA6 is executed. Adding the judgment on whether the independent warm air control panel is turned on avoids the system from performing complex control processes under unnecessary circumstances, saving system resources and energy consumption; adding the judgment on the engine start message signal can more timely and accurately judge the actual state of the engine. When the start message signal is not received within a certain period of time, the heater is turned off, further improving the safety and reliability of the system and preventing the heater from malfunctioning due to signal transmission problems.

[0011] As a preferred implementation of an independent warm air control method for a hazardous chemical tractor, in the working standby control process, it includes: SB1. Set the target temperature of warm air heating on the control panel; SB2. If the target temperature is greater than the current temperature in the cab, execute SB3; if the target temperature is less than the current temperature in the cab, the heater is not started; SB3. The heater operates at the first set gear, and it is judged whether △T < T1 is satisfied. If so, turn to SB4; if not, the heater maintains the first set gear operation, and △T = target temperature - current temperature; SB4. The heater operates at the second set gear, and it is judged whether △T < T2 is satisfied. If so, turn to SB6; if not, turn to SB; SB5. Judge whether △T > T1 is satisfied. If so, the heater operates at the first set gear and turns to SB3; if not, the heater continues to operate at the second set gear and turns to SB4; SB6. The heater operates at the third set gear, and it is judged whether △T < T3 is satisfied. If so, turn to SB8; if not, turn to SB7; SB7. Judge whether △T > T2 is satisfied. If so, the heater operates at the second set gear and turns to SB5; if not, the heater continues to operate at the third set gear and turns to SB6; SB8. The heater operates at the fourth set gear. After maintaining for a certain period of time, the heater enters the standby state. According to the difference between the actual temperature and the target temperature in the cab, the operation gear of the heater is intelligently and accurately adjusted, saving energy to the greatest extent while ensuring a comfortable temperature in the cab, avoiding the heater from operating at an unnecessary high-power gear, extending the service life of the heater, and at the same time improving the comfort of the passengers and drivers.

[0012] As a preferred implementation scheme for independent heating control of hazardous chemical tractor trucks, the standby control process also includes: SB9, after the heater enters standby mode, tracking the current temperature and determining whether the target temperature is greater than the current temperature; if yes, proceeding to SB6; otherwise, proceeding to SB10; SB10, determining whether the current temperature has dropped beyond T1; if yes, proceeding to SB6; otherwise, proceeding to SB11; SB11, determining whether the set standby time has been reached; if yes, proceeding to SB6; otherwise, proceeding to SB9. Adding a temperature tracking and judgment process after the heater enters standby mode allows for timely adjustment of the heater's operating status based on changes in the cab temperature. When the temperature drops to a certain level or the set standby time is reached, the heater automatically starts, maintaining a relatively stable cab temperature. This improves the comfort of the driver and passengers, achieves rational energy utilization, and avoids increased energy consumption and equipment wear caused by frequent heater starts.

[0013] As a preferred implementation scheme for independent heating control of hazardous chemical tractor-trailers, the fourth setting is the lowest setting of the heater, with the third, second, and first setting levels increasing sequentially; T1 is 2℃, T2 is 1℃, and T3 is -1℃. The system adjusts the heater's operating setting more accurately and rationally, enabling better precise control of the cab temperature. This ensures comfort while achieving energy savings and improving the control accuracy and operating efficiency of the independent heating system.

[0014] On the other hand, the present invention also provides a hazardous chemical tractor unit that employs the aforementioned independent heating control method for hazardous chemical tractor units. The application of this independent heating control method to the hazardous chemical tractor unit makes the control of its heating system more intelligent, safe, and energy-efficient, effectively improving the comfort and safety of passengers during hazardous chemical transportation and avoiding potential risks caused by improper heating system control.

[0015] As a preferred implementation of a hazardous materials tractor unit, the tractor unit includes a cab, a fuel tank, and an independent heating system assembly. The independent heating system assembly includes a heater, whose outlet is connected to an air outlet pipe. The end of the air outlet pipe furthest from the heater has three ventilation ducts. The first end of each ventilation duct is connected to the air outlet pipe, and the other two ends are connected to a right ventilation duct and a left ventilation duct, respectively. The right and left ventilation ducts connect to the cab. The heater is also connected to an oil pump, whose suction port is connected to the fuel tank. Through a reasonable structural design of the independent heating system assembly, the heat generated by the heater can be evenly distributed to the cab through the air outlet pipe, the three ventilation ducts, the right ventilation duct, and the left ventilation duct, ensuring uniform and comfortable temperature inside the cab. Simultaneously, the connection method between the heater, the oil pump, and the fuel tank ensures a stable fuel supply, providing a reliable guarantee for the normal operation of the heater and further improving the stability and reliability of the independent heating system.

[0016] As a preferred embodiment of a hazardous chemical tractor unit, the tractor unit also includes a frame, with the cab located at the front of the frame. The fuel tank is installed on one side of the frame and behind the cab. The other side of the frame also houses an exhaust manifold, a battery box, and a urea tank, arranged sequentially from front to back. The heater is installed on the bottom surface of the cab floor. The cab has a right air outlet and a left air outlet. The end of the right air duct furthest from the heater is located at the right air outlet, and the end of the left air duct furthest from the heater is located at the left air outlet. A return air inlet is also provided on the cab floor, corresponding to the cold air inlet of the heater, and a return air inlet screen is installed in the return air inlet. The fuel pump draws fuel from the tank to supply fuel to the heater installed on the bottom surface of the cab floor. The heater generates heat during operation, and the hot air enters the exhaust duct through the air outlet and is then transported to the three ventilation ducts. The three ventilation ducts distribute hot air to the connected right and left ducts, which then blow it out through the right and left air outlets located in the cab, evenly raising the temperature inside the cab. Simultaneously, cool air enters the cab through the return air vent on the floor, where it is filtered by a mesh screen before entering the heater's cold air inlet, completing the air circulation and heating process. On the other side of the chassis, the exhaust manifold, battery box, and urea tank, arranged sequentially from front to back, are rationally positioned with the entire heating system to ensure stable and reliable operation of the independent heating system and guarantee a uniform and comfortable temperature inside the cab.

[0017] As can be seen from the above technical solutions, the advantages of this invention are as follows: This solution automatically and accurately controls the start and stop of the heater based on the engine speed, avoiding manual operation by the driver and passengers. Especially in the transportation of hazardous chemicals, it prevents the heating system from malfunctioning when the engine is off, thus preventing safety hazards. The refined speed judgment process further enhances safety. At the same time, the judgment of the engine start-up message signal also enhances system safety, preventing signal problems from causing the heater to malfunction. Clearly defining the engine speed judgment standard and specific value facilitates precise control of the heater operation by the system; intelligently adjusting the heater's operating level based on the difference between the target temperature and the current temperature; and rationally controlling the heater based on temperature changes and standby time in standby mode, effectively saving energy and extending the heater's service life; the rational adjustment of the level combined with the structural design of the independent heating device assembly ensures uniform heat distribution, improving the comfort of the driver and passengers; the addition of judgment on the independent heating control panel saves system resources; the reasonable device structure ensures a stable fuel supply, improving system stability and reliability; and applying the control method to hazardous chemical tractor vehicles makes the heating system control more intelligent, effectively improving overall performance. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of the start-stop control process in Embodiment 1 of the present invention.

[0020] Figure 2 This is a flowchart of the working standby control process in Embodiment 1 of the present invention.

[0021] Figure 3 This is a schematic diagram of the hazardous chemical tractor in Embodiment 2 of the present invention.

[0022] Figure 4 This is a schematic diagram of the independent heating device assembly in the hazardous materials tractor of Embodiment 2 of the present invention.

[0023] Figure 5 This is a schematic diagram of the oil pump in Embodiment 2 of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure at the bottom of the driver's cab in Embodiment 2 of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the rear lining of the driver's cab in Embodiment 2 of the present invention.

[0026] Figure 8This is a schematic diagram of the interior structure of the driver's cab in Embodiment 2 of the present invention.

[0027] Explanation of main figure symbols 1. Cab, 11. Cab floor, 12. Cab side fender bracket, 13. Right air vent, 14. Left air vent, 15. Return air vent, 16. Cab rear liner, 161. Control panel, 17. Oil pump, 2. Fuel tank, 3. Exhaust manifold, 4. Battery box, 5. Urea tank, 6. Independent heating system assembly, 61. Heater, 62. Air duct, 63. Three-way ventilation duct, 64. Right air duct, 65. Left air duct, 66. Return air vent mesh cover, 67. Heater top cover, 68. Intake pipe, 69. Exhaust pipe, 691. Muffler, 692. Muffler bracket, 7. Chassis. Detailed Implementation

[0028] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0029] Example 1 This embodiment provides an independent heating control method for a hazardous chemical tractor, including a start / stop control process and a work / standby control process: In the start-stop control process, the engine's start, operation, or stop status is determined based on the engine speed. When the engine is determined to be in a start or operation state, the heater is turned on; when the engine is determined to be stopped, the heater is turned off and enters a standby state. Specifically, as follows... Figure 1 As shown, it includes the following steps: SA1. Determine if the engine speed is 0. If it is 0, turn off the heater and have the driver or passenger turn it on manually. If it is not 0, proceed with SA2. SA2. Determine if the engine speed is greater than the first set speed value. If yes, start heating; otherwise, execute SA3. SA3. Determine if the engine speed is within the first speed range. If yes, proceed to SA4; otherwise, proceed to SA5. SA4. Wait for the engine to start or stop; SA5. Determine if the engine speed is less than the second set speed value. If not, proceed to SA6; if yes, proceed to SA3. SA6. Heater off. If the switch is not turned off manually, the control panel will display ADR.

[0030] In step S1, for ADR (Automatic Remote Control) vehicles, if the engine speed is determined to be 0, the ADR function will appear on the driver's cab display panel, allowing the driver and passengers to choose whether to restart the heater. The electrical system of an ADR vehicle is equipped with a high-precision speed sensor, typically installed near the engine crankshaft or camshaft, to monitor engine speed in real time. The sensor transmits the speed signal as an electrical signal to the vehicle's central control unit (CCU), which has powerful data processing and logic judgment capabilities. Simultaneously, the driver's cab display panel uses an LCD screen to clearly and intuitively display various information and communicates with the CCU via a CAN bus to ensure stable and timely information transmission. When the CCU receives the signal from the speed sensor and determines that the current engine speed is 0, it triggers the corresponding program logic. The CCU sends a command to the driver's cab display panel via the CAN bus, displaying the ADR function interface. The interface uses prominent icons and text to indicate to the driver and passengers that the vehicle's engine speed is currently 0, and also provides an option to restart the heater. If the driver or passengers choose to restart the heater, their operation signal is converted into an electrical signal through the input circuit of the display panel, and then transmitted back to the CCU via the CAN bus. The CCU then issues a command to control the relay in the ADR system using a low-voltage switch signal, causing the relay to close and reconnecting the power supply circuit between the battery and the heater, thereby starting the heater.

[0031] For non-ADR vehicles, the heater is controlled by the driver or passenger using the corresponding switch inside the vehicle. Simultaneously, in step S2, before determining the engine speed, it is checked whether the independent heater control panel is on. If it is, the subsequent steps are executed; otherwise, the start / stop control process is aborted. Heater control in non-ADR vehicles primarily relies on physical switches inside the vehicle. These switches are typically installed in easily accessible locations, such as near the dashboard or center console. The switches are connected to the heater's power supply circuit via wires and employ mechanical contacts or electronic switch structures internally. When the driver or passenger needs to start or stop the heater, they directly operate the corresponding switch inside the vehicle manually.

[0032] Meanwhile, in step S2, before determining the engine speed, it is determined whether the independent heating control panel is turned on. If it is, the subsequent steps are executed; if not, the start-stop control process is aborted.

[0033] The above first set rotational speed value is the large-end endpoint of the first rotational speed range, and the second rotational speed temperature value is the small-end endpoint of the first rotational speed range; the first set rotational speed value is 350 rpm, and the second set rotational speed value is 250 rpm. That is, in step SA2, it is judged whether the rotational speed is greater than 350 rpm. If so, it can be regarded that the engine is working and the heating is started; in step SA3, it is judged whether 250 rpm < rotational speed ≤ 350 rpm is satisfied. If so, it turns to SA4; if not, it turns to SA5; in step SA5, it is judged whether the switch is disconnected or the engine rotational speed is less than 250 rpm. If not, SA6 is executed; if so, it turns to SA3.

[0034] In the working standby control process, a target temperature is set, and according to the difference between the current temperature and the target temperature, the operation gear of the heater is switched. Specifically, as Figure 2 shown, it includes: SB1. Set the target temperature of the warm air heating on the control panel; SB2. If the target temperature is greater than the current temperature in the cab, then SB3 is executed; if the target temperature is less than the current temperature in the cab, the heater is not started; SB3. The heater operates in the first set gear, and it is judged whether △T < T1 is satisfied. If so, it turns to SB4; if not, the heater maintains the first set gear operation, and △T = target temperature - current temperature; SB4. The heater operates in the second set gear, and it is judged whether △T < T2 is satisfied. If so, it turns to SB6; if not, it turns to SB5; SB5. It is judged whether △T > T1 is satisfied. If so, the heater operates in the first set gear and turns to SB3; if not, the heater continues to operate in the second set gear and turns to SB4; SB6. The heater operates in the third set gear, and it is judged whether △T < T3 is satisfied. If so, it turns to SB8; if not, it turns to SB7; SB7. It is judged whether △T > T2 is satisfied. If so, the heater operates in the second set gear and turns to SB5; if not, the heater continues to operate in the third set gear and turns to SB6; SB8. The heater operates in the fourth set gear, and after maintaining for a certain time, the heater enters the standby state; SB9. After the heater enters the standby state, the current temperature is tracked, and it is judged whether the target temperature is greater than the current temperature. If so, it turns to SB6; if not, it turns to SB10; SB10. It is judged whether the current temperature drops by more than T1. If so, it turns to SB6; if not, it turns to SB11; SB11. Determine if the set standby time has been reached. If yes, proceed to SB6; otherwise, proceed to SB9.

[0035] The fourth setting is the lowest setting of the heater. The third, second, and first settings increase sequentially. For example, the fourth setting is setting 1, the third setting is setting 2, the second setting is setting 3, and the first setting is setting 4. T1 is 2℃, T2 is 1℃, and T3 is -1℃.

[0036] Example 2 This embodiment further provides a hazardous chemical tractor unit, which adopts the independent heating control method for hazardous chemical tractor units described in Embodiment 1, such as... Figure 3-8 As shown, the tractor unit includes a frame 7, with a cab 1 located at the front of the frame 7. A fuel tank 2, an exhaust manifold 3, a battery box 4, and a urea tank 5 are also mounted on the frame 7. Specifically, the fuel tank 2 is located on the rear left side of the cab 1. Figure 3 The exhaust manifold 3, battery box 4, and urea tank 5 are located on the right rear side of the cab 1 (facing outwards from the paper). Figure 3 The center faces the side inside the paper, and the exhaust bag 3, battery box 4 and urea box 5 are arranged in sequence from front to back.

[0037] An independent heating system assembly 6 is also provided on the frame 7 or the cab 1. The independent heating system assembly 6 is located below the cab 1. Specifically, as shown in the figure... Figure 4 As shown, the independent heating system assembly 6 includes an integrated heater 61 and a heating duct. The heater 61 heats the air in the heating duct by burning vehicle fuel. The heater 61 has a heater cover 67 with multiple bolt mounting points and is fixedly installed on the bottom surface of the cab floor 11 of the cab 1 by bolts.

[0038] The heater 61 is connected to an intake pipe 68 and an exhaust pipe 69. The intake pipe 68 supplies combustion air to the heater 61, and the exhaust pipe 69 discharges the combustion exhaust gas from the heater 61. A muffler 691 is mounted on the exhaust pipe 69 and is fixed to the cab side fender bracket 12 of the cab 1 via a muffler bracket 692. An oil pump 17 is mounted on the frame. The oil pump 17's suction port is connected to the oil tank 2, and its outlet is connected to the heater 61 for heating air. The heating air duct includes an air outlet 62. One end of the air outlet 62 is connected to the heater 61. The end of the air outlet 62 furthest from the heater 61 has a three-way ventilation duct 63. The first end of the three-way ventilation duct 63 is connected to the air outlet 62, and the second end of the three-way ventilation duct 63 is connected to a right ventilation duct 64 and a left ventilation duct 65. Figure 8As shown, the cab 1 is equipped with a right air outlet 13 and a left air outlet 14. The right air duct 64 is connected to the right air outlet 13, and the left air duct 65 is connected to the left air outlet 14. The air heated by the heater 61 is introduced into the cab 1.

[0039] The cab floor 11 is provided with a return air vent 15, and the top of the heater 61 is also provided with a return air vent 15, which draws the cooled air in the cab 1 back into the heater 61. A return air vent mesh 66 is provided on the return air vent 15 and is fixed to the cab floor 11.

[0040] The oil pump draws oil from the tank to supply fuel to the heater installed on the underside of the cab floor. The heater generates heat, and the hot air enters the exhaust duct through the outlet, then flows to the three ventilation ducts. The three ventilation ducts split the hot air into the connected right and left ducts, and then blow it out through the right and left exhaust outlets located in the cab, evenly raising the temperature inside the cab. Simultaneously, cold air from inside the cab enters through the return air vent on the cab floor. After being filtered by the return air vent mesh, the air enters the cold air inlet of the heater, completing the air circulation and heating process. On the other side of the frame, the exhaust manifold, battery box, and urea tank, arranged sequentially from front to back, are rationally laid out with the entire heating system, ensuring no interference and guaranteeing stable and reliable operation of the independent heating system, thus ensuring a uniform and comfortable temperature inside the cab. A control panel 161 is installed on the rear lining 16 of the cab.

[0041] Furthermore, both the intake pipe 68 and the exhaust pipe 69 are flexible hoses, allowing for adjustment of their direction and position according to actual vehicle installation requirements. The oil pump 17 is connected to the oil tank and an independent heating device via oil pipes. The oil pipes are arranged at a 45° angle to the vehicle frame, with the lower end connected to the oil tank.

[0042] In the vehicle's control system, the BCM (Body Control Module) receives and forwards messages. Upon receiving a signal indicating that the control panel is open, the BCM forwards the signal to the ECU. When both the control panel is open and the vehicle speed signal meets the requirements, the heater starts operating. Information is transmitted via CAN signals.

[0043] When the BCM receives a message signal indicating that the control panel is open, it performs preliminary screening and processing of the signal according to preset logic and procedures. Only after confirming that the signal is valid and meets the relevant standards (i.e., the set conditions in the method of Example 1) will the BCM accurately forward the signal to the ECU (Electronic Control Unit). The ECU makes a decision by integrating information from multiple sources. In the heater operation process, the ECU receives the control panel open signal and obtains the vehicle engine speed signal. Only when the control panel open signal and the vehicle speed signal simultaneously meet the preset requirements will the ECU issue a command to start the heater. Throughout the entire information transmission process, CAN (Controller Area Network) signaling is employed. CAN signal transmission boasts extremely high reliability and real-time performance. Through two-wire differential signal transmission, it effectively resists external electromagnetic interference, ensuring accurate signal transmission even in complex vehicle electronic environments. Furthermore, the CAN bus features multi-master communication, allowing each node to proactively send data at any time, significantly improving information transmission efficiency. In addition, CAN signal transmission incorporates error detection and automatic retransmission capabilities. If a signal transmission error occurs, the system can quickly detect it and attempt to retransmit the data, ensuring the stability and safety of the vehicle control system.

[0044] As can be seen from the above embodiments, the beneficial effects of this invention are as follows: This solution automatically and accurately controls the start and stop of the heater based on the engine speed, avoiding manual operation by the driver and passengers. Especially in the transportation of hazardous chemicals, it prevents the heating system from malfunctioning when the engine is off, thus preventing safety hazards. The refined speed judgment process further enhances safety. At the same time, the judgment of the engine start-up message signal also enhances system safety, preventing signal problems from causing the heater to malfunction. Clearly defining the engine speed judgment standard and specific value facilitates precise control of the heater operation by the system; intelligently adjusting the heater's operating level based on the difference between the target temperature and the current temperature; and rationally controlling the heater based on temperature changes and standby time in standby mode, effectively saving energy and extending the heater's service life; the rational adjustment of the level combined with the structural design of the independent heating device assembly ensures uniform heat distribution, improving the comfort of the driver and passengers; the increased judgment of the independent heating control panel saves system resources; the reasonable device structure ensures a stable fuel supply, improving system stability and reliability; and applying the control method to hazardous chemical tractor vehicles makes the heating system control more intelligent, effectively improving overall performance.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for independent heating control of a hazardous chemical tractor, characterized in that, Package start-stop control process and working standby control process: In the start-stop control process, the start, operation, or stop of the engine is judged according to the engine speed state. When it is judged that the engine is in the start or operation state, the heater is turned on; when it is judged that the engine is in the stop state, the heater is turned off and enters the waiting-to-start state; In the working standby control process, a target temperature is set, and the operation gear of the heater is switched according to the difference between the current temperature and the target temperature.

2. The independent heating control method for a hazardous chemical tractor as described in claim 1, characterized in that, In the start-stop control process, it includes: SA1. Judge whether the engine speed is 0. If it is 0, turn off the heater and manually turn it on by the driver or passenger; if it is not 0, execute SA2; SA2. Judge whether the engine speed is greater than the first set speed value. If it is, start heating; if not, execute SA3; SA3. Judge whether the engine speed is within the first speed range. If it is, execute SA4; if not, go to SA5; SA4. Wait for the engine to start or stop; SA5. Judge whether the engine speed is less than the second set speed value. If not, execute SA6; if so, go to SA3; SA6. Turn off the heater.

3. The independent heating control method for a hazardous chemical tractor as described in claim 2, characterized in that, The first set speed value is the large-end endpoint of the first speed range, and the second set speed value is the small-end endpoint of the first speed range.

4. The independent heating control method for a hazardous chemical tractor according to claim 2, characterized in that, The first set speed value is 350 rpm, and the second set speed value is 250 rpm.

5. The independent heating control method for a hazardous chemical tractor according to claim 2, characterized in that, In step SA2, judge whether the independent warm air control panel is turned on. If it is, execute the subsequent steps; if not, abort the start-stop control process; In step SA5, in parallel with whether the engine speed is less than the second set speed value, if the engine start message signal is not received within a certain time, execute SA6.

6. The independent heating control method for a hazardous chemical tractor according to claim 1, characterized in that, In the working standby control process, it includes: SB1. Set the target temperature of the warm air heating on the control panel; SB2. If the target temperature is greater than the current temperature in the cab, execute SB3; if the target temperature is less than the current temperature in the cab, do not start the heater; SB3. The heater runs in the first set gear. Judge whether it satisfies △T < T1. If it does, switch to SB4; if not, the heater maintains the first set gear operation, and △T = target temperature - current temperature; SB4. The heater runs in the second set gear. Judge whether it satisfies △T < T2. If it does, switch to SB6; if not, switch to SB5; SB5. Judge whether it satisfies △T > T1. If it does, the heater runs in the first set gear and switches to SB3; if not, the heater continues to run in the second set gear and switches to SB4; SB6. The heater runs in the third set gear. Judge whether it satisfies △T < T3. If it does, go to SB8; if not, go to SB7; SB7. Judge whether it satisfies △T > T2. If it does, the heater runs in the second set gear and switches to SB5; if not, the heater continues to run in the third set gear and switches to SB6; SB8. The heater runs in the fourth set gear. After maintaining for a certain time, the heater enters the standby state.

7. The independent heating control method for a hazardous chemical tractor according to claim 6, characterized in that, In the working standby control process, it also includes: SB9: After the heater enters standby mode, it tracks the current temperature and determines whether the target temperature is greater than the current temperature. If it is, it switches to SB6; otherwise, it switches to SB10. SB10. Determine if the current temperature has dropped more than T1. If yes, proceed to SB6; otherwise, proceed to SB11. SB11. Determine if the set standby time has been reached. If yes, proceed to SB6; otherwise, proceed to SB9.

8. The independent heating control method for a hazardous chemical tractor according to claim 6, characterized in that, The fourth setting is the lowest setting for the heater, and the third, second, and first settings increase sequentially; T1 is 2℃, T2 is 1℃, and T3 is -1℃.

9. A hazardous chemical tractor unit, characterized in that, The independent heating control method for a hazardous chemical tractor as described in any one of claims 1-8 is adopted. The tractor includes a cab (1), a fuel tank (2), and an independent heating device assembly (6). The independent heating device assembly (6) includes a heater (61) and a heating channel. The heating channel includes an air outlet pipe (62). One end of the air outlet pipe is connected to the heater (61). The end of the air outlet pipe (62) away from the heater (61) is provided with a three-way ventilation duct (63). The first end of the three-way ventilation duct (63) is connected to the air outlet pipe (62). The other two ends of the three-way ventilation duct (63) are respectively connected to a right air duct (64) and a left air duct (65). The right air duct (64) and the left air duct (65) are connected to the cab (1). The heater (61) is also connected to an oil pump (17). The oil pump (17) has its suction port connected to the fuel tank (2).

10. The hazardous chemical tractor unit according to claim 9, characterized in that, The tractor also includes a frame (7), a cab (1) located at the front of the frame (7), a fuel tank (2) installed on one side of the frame (7) and located behind the cab (1), and an exhaust manifold (3), a battery box (4) and a urea tank (5) are also provided on the other side of the frame (7), with the exhaust manifold (3), the battery box (4) and the urea tank (5) arranged sequentially from front to back; The heater (61) is installed on the bottom surface of the cab floor plate (11) of the cab (1). The cab (1) is provided with a right air outlet (13) and a left air outlet (14). The end of the right air duct (64) away from the heater (61) is located at the right air outlet (13), and the end of the left air duct (65) away from the heater (61) is located at the left air outlet (14). The cab floor plate (11) is also provided with a return air inlet (15). The return air inlet (15) corresponds to the cold air inlet of the heater (61), and a return air inlet screen (66) is installed in the return air inlet (15).

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