A control method of a methanol heating system for vehicle and the heating system

Abstract

The present application relates to a kind of vehicle methanol heating system control method and heating system, methanol heating system is according to engine speed set value and coolant temperature set value determines whether engine starts, then according to the determination case corresponding control logic is executed;Realize the linkage heating control of air heating and methanol heating system, heating power superposition, adapt to the comfort requirement of cab under super-low temperature environment working condition;Realize the coupling of methanol heating system and air heating in waterway and control, cooling liquid circulation loop opening and closing is controlled using water valve A and water valve B, improve operation convenience and reliability;Using methanol heating device replaces fuel heater, embodies the integrated control of methanol heating device and air heating, reduces fuel tank and heater control panel, reduces product cost.

Description

Technical Field

[0001] This invention relates to the field of vehicle thermal management technology, and in particular to a control method and heating system for a methanol heating system in a vehicle. Background Technology

[0002] Because methanol has a high latent heat of vaporization and poor evaporability at low temperatures, it is difficult for methanol fuel to atomize and evaporate, preventing it from combining with air to form a combustible mixture. Therefore, methanol-fueled heavy-duty trucks experience difficulties starting in cold environments in northern regions. To improve their adaptability to low-temperature environments, the current preheating solutions are: first, using gasoline for cold starts, where gasoline combustion is performed until the engine coolant reaches a certain temperature before switching to methanol fuel; second, using a diesel-powered independent heater to heat the engine coolant, preheating the engine before starting.

[0003] Using gasoline for cold starts is problematic because heavy-duty truck engines have large cylinder diameters and long flame propagation distances, making the flames prone to extinguishing at low temperatures. This method only supports cold starts at ambient temperatures ≥-17℃. Additionally, a gasoline fuel supply system needs to be added to the methanol engine, requiring the vehicle to be refueled with both methanol and gasoline during operation, which causes inconvenience for users.

[0004] Using a diesel-powered independent heater to preheat the engine requires the use of low-grade diesel fuel, increasing operating costs. It also uses both methanol and diesel fuel, causing inconvenience to users. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a control method and heating system for a vehicle methanol heating system.

[0006] This invention is achieved using the following technical solution:

[0007] A control method for a methanol heating system for vehicles, wherein the methanol heating system determines whether the engine is started based on the engine speed setpoint and the coolant temperature setpoint, and then performs corresponding control based on the determination.

[0008] The engine is determined to be not started based on the engine speed setpoint. If the coolant temperature is lower than the setpoint of the coolant temperature sensor when the engine is not started, engine preheating control is executed. The heating power of the methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor. When engine preheating control is executed, the methanol heating system will immediately stop if the engine is detected to have started.

[0009] The engine is determined to be not started based on the engine speed setting value. If the coolant temperature is higher than the set value of the coolant temperature sensor when the engine is not started, the cab heating mode is activated. The heating power of the methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor.

[0010] The engine is determined to be started based on the engine speed setpoint. If the air conditioning heater is turned on and the ambient temperature in the cab is lower than the set value of the air conditioning heater temperature sensor, the methanol heating system will respond to the air conditioning heater's linkage on / off. The heating power of the methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor. If the user manually turns off the methanol heating system during the linkage heating operation, the air conditioning heater linkage on / off logic will not be responded to in this cycle.

[0011] Preferably, if the air conditioning heater is not turned on when the engine is running, the user can manually turn on the methanol heating system. If the air conditioning heater is turned on while the methanol heating system is running, the methanol heating system will not respond to the air conditioning heater linkage on / off logic.

[0012] A vehicle methanol heating system for implementing the vehicle methanol heating system control method as described above, comprising a methanol heating system, an air conditioning heater and an engine, wherein the methanol heating system, the air conditioning heater and the engine form several coolant circulation loops with different control modes.

[0013] The methanol heating system includes a methanol tank, a filter, a water pump, an alcohol pump, and a methanol heating device;

[0014] The methanol tank, filter, methanol pump, and methanol heating device are connected in sequence to form a methanol fuel circuit;

[0015] The coolant circulation loops with different control modes include the engine preheating control coolant circulation loop, the cab single heating control coolant circulation loop, and the cab air conditioning heater and methanol heating device linkage control coolant circulation loop.

[0016] The engine's coolant outlet is connected to a methanol heating device via a water pump, and the methanol heating device is connected to the engine's coolant inlet via a water valve B, forming an engine preheating control coolant circulation loop.

[0017] The engine's coolant outlet is connected to a methanol heating device via a water pump. The methanol heating device is connected to the air conditioning heater via water valve A. The air conditioning heater is connected to the engine's coolant inlet, forming a single-heating control coolant circulation loop in the cab.

[0018] The engine's coolant outlet is connected to a methanol heating device via a water pump. The methanol heating device is connected to the air conditioning heater via water valve A. The air conditioning heater is connected to the engine's coolant inlet, forming a linkage between the cab's air conditioning heater and the methanol heating device to control the coolant circulation loop.

[0019] Preferably, the methanol heating device is equipped with a methanol heating device temperature sensor, the air conditioning heater is equipped with an air conditioning heater temperature sensor, and the engine is equipped with a coolant temperature sensor; the air conditioning heater is located in the driver's cab.

[0020] Preferably, the methanol heating system, air conditioning heater, and engine are connected to the vehicle controller via CAN bus, LIN bus, or hardwire.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] It provides an engine preheating function to solve the problem of cold starting in methanol-fueled heavy trucks at -40℃, improving the engine's low-temperature adaptability; it provides a cab heating function when parked, allowing the methanol heating system to be used independently to heat the cab when the engine is off, reducing methanol fuel consumption by approximately 20%; it achieves linkage heating control between the air conditioning heater and the methanol heating system, with superimposed heating power to meet the comfort needs of the cab in ultra-low temperature environments; it couples the methanol heating system and the air conditioning heater in terms of water circuits and control, with the coolant circulation loop opening and closing using water valves A and B, improving operational convenience and reliability; it replaces the fuel heater with a methanol heating device, demonstrating integrated control of the methanol heating device and the air conditioning heater, reducing the need for a fuel tank and heater control panel, and lowering product costs. Attached Figure Description

[0023] Figure 1 This is the control logic diagram of the method in this invention;

[0024] Figure 2 This is an overall framework diagram of the system in this invention;

[0025] Figure 3 This is a diagram of the engine preheating control coolant circulation loop in this invention;

[0026] Figure 4 This is a diagram of the coolant circulation loop for single-heater control in the driver's cab in this invention;

[0027] Figure 5 This is a circuit diagram of the cooling fluid circulation control system for the linkage heating of the air conditioning heating and methanol heating system of the present invention.

[0028] Attached image captions:

[0029] 1. Methanol heating device; 2. Engine; 3. Air conditioning heater; 4. Methanol tank; 5. Filter; 6. Water pump; 7. Methanol pump; 8. Water valve B; 9. Water valve A. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0031] Example 1

[0032] like Figure 1 As shown, a control method for a vehicle methanol heating system is provided. The methanol heating system determines whether the engine 2 is started based on the engine speed setpoint and the coolant temperature setpoint, and then performs corresponding control according to the determination.

[0033] Based on the engine speed setting value, it is determined that engine 2 is not started. When engine 2 is not started, if the coolant temperature is lower than the setting value of the coolant temperature sensor, engine preheating control is executed. The heating power of methanol heating device 1 in the methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor. When engine preheating control is executed, if it is detected that engine 2 has started, the methanol heating system will stop immediately.

[0034] Based on the engine speed setting value, it is determined that engine 2 is not started. When engine 2 is not started, if the coolant temperature is higher than the setting value of the coolant temperature sensor, the cab heating mode is executed. The heating power of methanol heating device 1 in methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor.

[0035] Based on the engine speed setting value, it is determined that engine 2 is started. If the air conditioning heater 3 is turned on and the ambient temperature in the cab is lower than the setting value of the air conditioning heater temperature sensor, the methanol heating system will respond to the linkage on / off of the air conditioning heater. The heating power of methanol heating device 1 in the methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor. During the linkage heating operation, if the user manually turns off the methanol heating system, the linkage on / off logic of the air conditioning heater will not be responded to in this cycle.

[0036] If the air conditioning heater 3 is not turned on when engine 2 is running, the user can manually turn on the methanol heating system. If the air conditioning heater 3 is turned on while the methanol heating system is running, the methanol heating system will not respond to the air conditioning heater linkage on and off logic.

[0037] Example 2

[0038] like Figure 2 As shown, a vehicle methanol heating system is used to implement any of the above vehicle methanol heating system control methods, including a methanol heating system, an air conditioning heater 3 and an engine 2, wherein the methanol heating system, the air conditioning heater 3 and the engine 2 form several coolant circulation loops with different control modes.

[0039] The methanol heating system includes an alcohol tank 4, a filter 5, a water pump 6, an alcohol pump 7, and a methanol heating device 1;

[0040] The methanol tank 4, filter 5, methanol pump 7 and methanol heating device 1 are connected in sequence to form a methanol fuel circuit;

[0041] The coolant circulation loops with different control modes include the engine preheating control coolant circulation loop, the cab single heating control coolant circulation loop, and the cab air conditioning heater 3 and methanol heating device 1 linkage heating control coolant circulation loop.

[0042] like Figure 3 As shown, the coolant outlet of engine 2 is connected to methanol heating device 1 via water pump 6, and methanol heating device 1 is connected to coolant inlet of engine 2 via water valve B8, forming an engine preheating control coolant circulation loop.

[0043] like Figure 4 As shown, the coolant outlet of engine 2 is connected to methanol heating device 1 via water pump 6, methanol heating device 1 is connected to air conditioning heater 3 via water valve A9, and air conditioning heater 3 is connected to coolant inlet of engine 2, forming a single heating control coolant circulation loop in the cab.

[0044] like Figure 5 As shown, the coolant outlet of engine 2 is connected to methanol heating device 1 via water pump 6. Methanol heating device 1 is connected to air conditioning heater 3 via water valve A9. Air conditioning heater 3 is connected to coolant inlet of engine 2, forming a linkage heating and control coolant circulation loop between air conditioning heater 3 and methanol heating device 1 in the cab.

[0045] The methanol heating device 1 is equipped with a methanol heating device temperature sensor, the air conditioning heater 3 is equipped with an air conditioning heater temperature sensor, and the engine 2 is equipped with a coolant temperature sensor; the air conditioning heater 3 is located in the driver's cab.

[0046] The methanol heating system, air conditioning heater, and engine 2 are connected to the vehicle controller via CAN bus, LIN bus, or hard wire.

Claims

1. A control method for a vehicle methanol heating system, characterized in that, The methanol heating system determines whether the engine (2) is started based on the engine speed setpoint and the coolant temperature setpoint, and then performs corresponding control according to the determination. The engine (2) is determined to be not started based on the engine speed setting value. When the engine (2) is not started, if the coolant temperature is less than the setting value of the coolant temperature sensor, the engine preheating control is executed. The heating power of the methanol heating system is automatically adjusted according to the temperature threshold set by the temperature sensor of the methanol heating device. When the engine preheating control is executed, if the engine (2) is detected to be started, the methanol heating system will stop immediately. The engine (2) is determined to be not started based on the engine speed setting value. If the coolant temperature is greater than the set value of the coolant temperature sensor when the engine (2) is not started, the cab heating mode is executed. The heating power of the methanol heating system is automatically adjusted according to the temperature threshold set by the methanol heating device temperature sensor. The engine (2) is determined to be started based on the engine speed setting value. If the air conditioning heater (3) is turned on and the ambient temperature of the cab is less than the setting value of the air conditioning heater temperature sensor, the methanol heating system will respond to the air conditioning heater linkage to turn on and off. The heating power of the methanol heating system will be automatically adjusted according to the temperature threshold set by the temperature sensor of the methanol heating device. If the user manually turns off the methanol heating system during the linkage heating operation, the air conditioning heater linkage to turn on and off logic will not be responded to in this cycle. The methanol heating system includes a methanol heating structure, which includes an alcohol tank (4), a filter (5), a water pump (6), an alcohol pump (7), and a methanol heating device (1).

2. The control method for a vehicle methanol heating system according to claim 1, characterized in that, If the air conditioning heater (3) is not turned on when the engine (2) is started, the user can manually turn on the methanol heating system. If the air conditioning heater (3) is turned on while the methanol heating system is running, the methanol heating system will not respond to the air conditioning heater linkage on and off logic.

3. A vehicle methanol heating system, used to implement the vehicle methanol heating system control method described in any of the above descriptions, characterized in that, It includes a methanol heating structure, an air conditioning heater (3) and an engine (2), wherein the methanol heating structure, the air conditioning heater (3) and the engine (2) form several coolant circulation loops with different control modes; The methanol heating structure includes a methanol tank (4), a filter (5), a water pump (6), a methanol pump (7), and a methanol heating device (1). The methanol tank (4), filter (5), methanol pump (7) and methanol heating device (1) are connected in sequence to form a methanol fuel circuit; The coolant circulation loops with different control modes include the engine preheating control coolant circulation loop, the cab single heating control coolant circulation loop, and the cab air conditioning heater (3) and methanol heating device (1) linkage heating control coolant circulation loop. The coolant outlet of the engine (2) is connected to the methanol heating device (1) via a water pump (6), and the methanol heating device (1) is connected to the coolant inlet of the engine (2) via a water valve B (8), forming an engine preheating control coolant circulation loop. The coolant outlet of the engine (2) is connected to the methanol heating device (1) via a water pump (6), the methanol heating device (1) is connected to the air conditioning heater (3) via a water valve A (9), and the air conditioning heater (3) is connected to the coolant inlet of the engine (2), forming a single heating control coolant circulation loop in the cab. The coolant outlet of the engine (2) is connected to the methanol heating device (1) via a water pump (6). The methanol heating device (1) is connected to the air conditioning heater (3) via a water valve A (9). The air conditioning heater (3) is connected to the coolant inlet of the engine (2), forming a linkage heating control coolant circulation loop between the air conditioning heater (3) in the cab and the methanol heating device (1).

4. The vehicle methanol heating system according to claim 3, characterized in that, The methanol heating device (1) is equipped with a methanol heating device temperature sensor, the air conditioning heater (3) is equipped with an air conditioning heater temperature sensor, and the engine (2) is equipped with a coolant temperature sensor; the air conditioning heater (3) is located in the driver's cab.

5. The vehicle methanol heating system according to claim 3, characterized in that, The methanol heating structure, air conditioning heater and engine (2) are connected to the vehicle controller via CAN bus, LIN bus or hard wire.

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