A method and system for starting the parking air conditioner of an engineering vehicle

Abstract

This invention discloses a method and system for starting the parking air conditioner of an engineering vehicle, comprising: Step 1, determining whether the vehicle has the power-on conditions for starting the parking air conditioner mode; Step 2, powering on the air conditioning system; Step 3, starting the engine; Step 4, turning off the engine; Step 5, starting the air conditioning system. Beneficial effects: By replacing the traditional generator of engineering machinery with an ISG motor that integrates both power generation and electric motor functions, and by allowing the ISG motor to switch between generator and electric motor modes according to the vehicle's usage scenario, and by optimizing the transmission method between the engine crankshaft, the ISG motor, and the air conditioning compressor, the air conditioning system can switch between parking air conditioning mode and driving air conditioning mode to meet the requirements of the driver and passengers using air conditioning when the engine is off. This also improves vehicle safety, reduces costs, increases reliability and economy, and solves the problems of insufficient air conditioning standby time, easily damaged starting batteries, and insufficient cooling power.

Description

Technical Field

[0001] This invention relates to a method and system for starting the air conditioning of an engineering vehicle, and particularly to a method and system for starting the air conditioning of an engineering vehicle while it is parked, belonging to the field of engineering machinery technology. Background Technology

[0002] A vehicle air conditioner is a device that regulates the air quality inside a vehicle's cabin. It adjusts humidity, temperature, airflow, and cleanliness to maintain a comfortable level for the driver and passengers. The air conditioning system consists of a compressor, condenser, receiver-drier, expansion valve, evaporator, piping, and control circuitry. Some systems also include ambient temperature and fan speed sensors, automatically adjusting cooling, heating, and airflow based on external temperature, sunlight intensity, and other factors to maintain a comfortable temperature inside the cabin.

[0003] Compressor: The vaporized refrigerant is compressed and delivered to the condenser under high temperature and high pressure.

[0004] Condenser: The vaporized refrigerant is cooled and delivered to the receiver-drier in a liquid state.

[0005] Receiver dryer: Here, moisture and dust are removed from the refrigerant, and the refrigerant flows to the expansion valve.

[0006] Expansion valve: The refrigerant expands rapidly here and flows to the evaporator in a low-temperature, low-pressure mist.

[0007] Evaporator: The refrigerant mist in the evaporator absorbs heat from the air (inside the vehicle) that comes into contact with the evaporator and evaporates. It is then reheated and drawn into the compressor in a gaseous state.

[0008] The air conditioning system of traditional fuel-powered construction machinery also includes a V-shaped rubber drive belt and a belt tensioner. The V-shaped rubber drive belt connects the engine crankshaft and the air conditioning compressor, obtaining power from the engine to drive the compressor. The belt tensioner is used to adjust the belt deflection.

[0009] As users' demands for comfort increase, vehicles need to meet not only the air conditioning cooling needs while driving but also those while parked. Current market solutions involve adding a separate overhead or split-type wall-mounted parking air conditioner to the existing vehicle air conditioning system. However, existing parking air conditioners have the following disadvantages: 1. It is noisy and increases the weight by about 35kg.

[0010] 2. It occupies the space of the cab roof window or side wall, affecting wind resistance, and a sunroof cannot be selected at the same time.

[0011] 3. Poor safety. Vehicle batteries typically operate at DC 12V or DC 24V. Low-voltage DC power supply can only increase power by increasing current. For example, a 4000W air conditioning system powered by a DC 24V battery would draw as much as 167A. This violates safety requirements for the driver's cab and the usage requirements for batteries.

[0012] 4. Poor cooling effect. Low-voltage power supply results in extremely low cooling capacity, which can only be designed so that the air conditioning cold air outlet directly cools the driver, and cannot refine the temperature inside the cockpit.

[0013] 5. There are few manufacturers developing such products, the technical solutions are immature, and the failure rate is extremely high.

[0014] In summary, common parking air conditioning systems cannot achieve the optimal balance between safety, performance, cost, reliability, and economy, and generally suffer from problems such as insufficient standby time, easy damage to the starting battery, and insufficient cooling capacity. Summary of the Invention

[0015] Purpose of the invention: The purpose of this invention is to address the problems existing in the prior art by providing a method and system for starting the parking air conditioner of engineering vehicles. By replacing the generator of traditional engineering machinery with an ISG (Integrated Starter Generator, or ISG for short) motor that integrates both power generation and electric motor functions, the ISG motor switches between parking air conditioner mode and driving air conditioner mode according to the vehicle's usage scenario, thus meeting the requirements of the driver and passengers to use the air conditioner when the engine is off.

[0016] Technical solution: A method for starting the parking air conditioner of an engineering vehicle, comprising the following steps: Step 1: Determine if the vehicle has the power-on conditions to start the parking air conditioning mode: The ECU controller detects the battery level of the air conditioning system and determines if the battery is low. If so, it controls the engine to start the driving air conditioning mode and charges the air conditioning system battery through the ISG motor; if not, the vehicle has the power-on conditions to start the parking air conditioning mode and proceeds to Step 2. Step 2: Powering on the air conditioning system: Check if the temperature inside the driver's cab has reached the set temperature for starting the parking air conditioning mode. If so, send a power-on signal to the ECU controller, which will then power on the air conditioning system and proceed to Step 3. If not, the air conditioning system will not be powered on, and the operator can manually power on the system. Step 3: Start the engine: Check if the air conditioning system is not started. If so, the operator starts the engine, and the ECU controller sends an activation signal to the air conditioning system to provide the activation conditions for the air conditioning system to start, then proceed to Step 4; if not, the engine is locked. Step 4: Engine shutdown: The operator shuts off the engine, turning off the entire vehicle and making the parking air conditioning mode ready to start, then proceeds to Step 5; Step 5: Activate parking air conditioning mode: The air conditioning system is powered on, and the ISG motor drives the air conditioning system to activate the parking air conditioning mode. The ECU controller controls the engine to be locked when the parking air conditioning mode is activated.

[0017] This invention first determines whether the parking air conditioning mode is ready to operate by checking if the battery is low on charge. This prevents continued use of the parking air conditioning when the battery is low, which could damage the battery. In this case, the engine-start driving air conditioning mode is selected, where the air conditioning compressor is directly driven by the engine crankshaft, the vehicle remains parked, and the engine drives the ISG motor to charge the battery. In this mode, the ISG motor acts as a generator. Secondly, it checks if the interior temperature has reached the set temperature for the parking air conditioning mode. If the set temperature is reached, the parking air conditioning mode meets the temperature setting conditions, and the ECU controller controls the air conditioning system to operate. If the set temperature is not reached, the operator can manually power on the air conditioning system as needed, making the parking air conditioning system more user-friendly. Then, the system is checked to see if it is not started. The engine can only be started when the air conditioning system is not started. If the air conditioning system is already started, the engine is locked and cannot be started by the operator to prevent excessive starting current from causing irreversible damage to the battery. After the engine is started and then turned off, the parking air conditioning mode is ready to start. Finally, the ISG motor drives the air conditioning system to start, so as to meet the requirements of the driver and passengers to use the air conditioning when the engine is off.

[0018] In a preferred embodiment, to meet the air conditioning requirements of drivers and passengers when the vehicle is parked, the parking air conditioning mode in step one is powered by the air conditioning system battery to the ISG motor, which then drives the air conditioning system to start. In the driving air conditioning mode, the engine drives the air conditioning system to start, while simultaneously charging the air conditioning system battery via the ISG motor. The traditional generator is replaced with an ISG motor that integrates both power generation and electric motor functions. The ISG motor switches between generator and electric motor operating modes according to the vehicle's usage scenario, corresponding to driving and parking air conditioning modes respectively. This satisfies the air conditioning requirements of drivers and passengers when the vehicle is parked, charges the battery, protects the battery, and extends its lifespan.

[0019] Preferably, to ensure the parking air conditioning system's power input remains powered even after the engine is turned off, the activation condition for starting the air conditioning system in step three is that the air conditioning system's power input is connected and self-locked, and the air conditioning system's circuit interlock control terminal is locked at this time. This ensures that the air conditioning system's power input remains connected even after the engine is turned off in step four. After the ECU controller starts the engine, it sends a start signal S to the air conditioning system's power input. The power input has a self-locking function after being energized, allowing it to remain energized even after the engine is turned off, providing the activation condition for subsequent air conditioning system startup. Furthermore, it ensures that the engine is locked when the parking air conditioning mode is activated, resulting in greater energy savings and circuit protection.

[0020] Preferably, to prevent the engine from restarting when the parking air conditioning mode is activated, the activation condition for the parking air conditioning mode in step four is as follows: after the engine is turned off, the circuit interlock control terminal of the air conditioning system is unlocked, allowing the power input terminal of the air conditioning system to send an electrical signal to the ISG motor, thus connecting the overall circuit of the air conditioning system. At this time, the parking air conditioning mode is ready to start. When the engine is running, the circuit interlock control terminal is locked, and the power input terminal cannot send an electrical signal to the ISG motor. At this time, the system is open-circuited, and the parking air conditioning mode cannot start. Only when the engine is turned off and the circuit interlock control terminal is unlocked can the power input terminal send an electrical signal to the ISG motor, connecting the system circuit and enabling the parking air conditioning mode to start. This protects the battery, extends battery life, and saves fuel consumption.

[0021] A system for starting the parking air conditioner of an engineering vehicle includes an ECU controller, a relay assembly, and a vehicle system assembly connected to each other. The vehicle system assembly includes an air conditioning system battery, an engine, an ISG motor, a clutch, an air conditioning compressor, a parking air conditioning mode switch, a temperature sensor, and a transmission device. The relay assembly includes a power activation relay assembly, an output relay assembly, and a circuit interlock relay assembly. The engine, ISG motor, and air conditioning compressor are connected by a transmission device, and a clutch is provided between the engine and the transmission device. The temperature sensor is connected to the ECU controller signal, and the air conditioning system battery is connected to the relay assembly through a parking air conditioning mode switch. The power activation relay assembly is connected to the output relay assembly and supplies power to the output relay assembly. The circuit interlock relay assembly is connected to the output relay assembly to control the on / off state of the output relay assembly.

[0022] This invention first connects the engine, ISG motor, and air conditioning compressor via a transmission device. A clutch is installed between the engine crankshaft and the transmission device. When the ISG motor is used as an electric motor, the clutch is disengaged from the engine crankshaft, and the clutch idles with the transmission device. The electric motor drives the transmission device to rotate the air conditioning compressor. When the ISG motor is used as a generator, the clutch is connected to the engine crankshaft, and the crankshaft drives the transmission device to rotate the ISG motor, thereby charging the air conditioning system battery. At the same time, the engine drives the transmission device to rotate the air conditioning compressor, activating the vehicle's air conditioning mode. After the temperature sensor detects that the interior temperature has reached the set temperature for starting the parking air conditioning mode, it sends a signal to the ECU controller. The ECU controller then controls the parking air conditioning mode switch to close, thereby powering on the parking air conditioning system. Starting the engine activates the power supply and relay assembly, keeping the parking air conditioning mode continuously powered. The circuit interlock relay assembly switches between locked and unlocked states to ensure the engine is locked when the parking air conditioning mode is activated. When the engine is unlocked, the parking air conditioning mode cannot be activated; the driving air conditioning mode can only be activated by starting the engine. When the circuit interlock relay assembly is unlocked, the output relay assembly closes, forming a circuit, thus activating the parking air conditioning mode. Here, "locked" means the engine has the starting function but cannot be started due to being locked and requires unlocking; "unlocked" means the engine is startable and can be started at any time.

[0023] In a preferred embodiment, to ensure that the parking air conditioning mode remains continuously powered after the engine is turned off, the power activation relay assembly includes a first relay and a second relay. The output terminal of the first relay is connected to the control terminal and output terminal of the second relay, and the input terminal of the second relay is connected to the air conditioning system battery. When the control terminal of the second relay is energized, the second relay self-locks.

[0024] In a preferred embodiment, for activating the parking air conditioning mode, the output relay assembly includes a third relay, the output terminal of the second relay is connected to the control terminal and input terminal of the third relay and supplies power to the third relay, and the output terminal of the third relay is connected to the ISG motor.

[0025] In a preferred embodiment, for circuit protection, the circuit interlock relay assembly includes a fourth relay and a fifth relay. The input terminal of the fourth relay is connected to the control terminal of the third relay, the output control terminal of the fourth relay is connected to the output terminal of the fifth relay, and the input control terminal of the fourth relay is connected to the ISG motor or grounded. The input terminal of the fifth relay is connected to the air conditioning system battery, and the control terminal of the fifth relay is connected to the ECU controller.

[0026] For the third relay to send an electrical signal to the ISG motor, its 86 control terminal must be activated. This 86 control terminal is connected to the 30 input terminal of the fourth relay. For the fourth relay to activate, its 86 output control terminal must be energized. This 86 output control terminal is connected to the output terminal of the fifth relay. If the fifth relay's output terminal is energized, its control terminal must not be energized and engaged. If the fifth relay's control terminal is not energized, the engine cannot be unlocked; otherwise, the circuit interlock relay assembly returns to the locked state. When the engine sends a start signal S, the fifth relay's control terminal engages, and its 30 input terminal connects to pin 87. Only when the engine is locked (not started) is the input terminal 30 of the fifth relay connected to the output terminal, thereby unlocking the circuit interlock relay assembly. This allows the control terminal of the third relay to be energized and energized, sending an electrical signal to the ISG motor to activate the parking air conditioning mode. When the ISG motor is used as an electric motor, the control terminal 85 of the fourth relay is grounded to the D+ signal. When the ISG motor is used as a generator, the control terminal 85 of the fourth relay is connected to the ISG motor and receives the B+ signal to charge the vehicle battery or the air conditioning system battery. When the engine is started, the ISG motor is in generator mode. After the engine is turned off, the ISG motor stops generator mode and switches to electric mode upon receiving power.

[0027] Beneficial effects: This invention replaces the generator of traditional construction machinery with an ISG motor that integrates both power generation and electric motor functions. The ISG motor switches between generator and electric motor operating modes according to the vehicle's usage scenario. It also optimizes the transmission method between the engine crankshaft, the ISG motor, and the air conditioning compressor, allowing the air conditioning system to switch between parking and driving modes. This meets the air conditioning requirements of the driver and passengers when the engine is off, improves vehicle safety, reduces costs, increases reliability and economy, and solves the problems of insufficient air conditioning standby time, easy damage to the starting battery, and insufficient cooling power. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is a schematic diagram of the relay assembly of the present invention. Implementation

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

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] like Figure 1 As shown, a method for starting the parking air conditioner of an engineering vehicle includes the following steps: Step 1: Determine if the vehicle has the power-on conditions to start the parking air conditioning mode: The ECU controller detects the battery level of the air conditioning system and determines if the battery is low. If so, it controls the engine to start the driving air conditioning mode and charges the air conditioning system battery through the ISG motor; if not, the vehicle has the power-on conditions to start the parking air conditioning mode and proceeds to Step 2. Step 2: Powering on the air conditioning system: Check if the temperature inside the driver's cab has reached the set temperature for starting the parking air conditioning mode. If so, send a power-on signal to the ECU controller, which will then power on the air conditioning system and proceed to Step 3. If not, the air conditioning system will not be powered on, and the operator can manually power on the system. Step 3: Start the engine: Check if the air conditioning system is not started. If so, the operator starts the engine, and the ECU controller sends an activation signal to the air conditioning system to provide the activation conditions for the air conditioning system to start, then proceed to Step 4; if not, the engine is locked. Step 4: Engine shutdown: The operator shuts off the engine, turning off the entire vehicle and making the parking air conditioning mode ready to start, then proceeds to Step 5; Step 5: Activate parking air conditioning mode: The air conditioning system is powered on, and the ISG motor drives the air conditioning system to activate the parking air conditioning mode. The ECU controller controls the engine to be locked when the parking air conditioning mode is activated.

[0034] First, the battery level is checked to determine if the parking air conditioning mode is ready to operate. This prevents damage from using the parking air conditioning when the battery is low. In this case, the engine-start driving air conditioning mode is selected, where the air conditioning compressor is directly driven by the engine crankshaft, keeping the vehicle parked. Simultaneously, the engine drives the ISG motor to charge the battery, which acts as a generator. Second, the interior temperature is checked to see if the parking air conditioning mode has reached the set temperature. If it has, the parking air conditioning mode meets the temperature setting requirements, and the ECU controller powers on the air conditioning system. If the set temperature is not reached, the operator can manually power on the air conditioning system as needed, making the parking air conditioning system more user-friendly. Then, the operator checks whether the air conditioning system is in a non-started state. The engine can only be started when the air conditioning system is not started. If the air conditioning system is already started, the engine is locked and cannot be started by the operator to prevent excessive starting current from causing irreversible damage to the battery. After the engine is started and then turned off, the parking air conditioning mode is ready to start. Finally, the ISG motor drives the air conditioning system to start, so as to meet the requirements of the driver and passengers to use the air conditioning when the engine is off.

[0035] To meet the air conditioning needs of drivers and passengers when the vehicle is parked, in step one, the parking air conditioning mode is powered by the air conditioning system battery to the ISG motor, which then drives the air conditioning system to start. In the driving air conditioning mode, the engine drives the air conditioning system to start, while simultaneously charging the air conditioning system battery via the ISG motor. The traditional generator is replaced with an ISG motor that integrates both power generation and electric motor functions. The ISG motor switches between these two operating modes—generator and motor—according to the vehicle's usage scenario, corresponding to driving and parking air conditioning modes respectively. This satisfies the air conditioning needs of drivers and passengers when the vehicle is parked, charges the battery, protects the battery, and extends its lifespan.

[0036] To ensure the parking air conditioning system retains power after the engine is turned off, the activation condition for starting the air conditioning system in step three is that the power input terminal of the air conditioning system is connected and self-locked, and the circuit interlock control terminal of the air conditioning system is in a locked state. This ensures that the power input terminal of the air conditioning system remains connected even after the engine is turned off in step four. After the ECU controller starts the engine, it sends a start signal S to the power input terminal of the air conditioning system. The power input terminal has a self-locking function after being energized, allowing it to still receive power after the engine is turned off, providing the activation condition for subsequent air conditioning system startup. Furthermore, it ensures that the engine is locked when the parking air conditioning mode is activated, resulting in greater energy savings and circuit protection.

[0037] To prevent the engine from restarting when the parking air conditioning mode is activated, the activation condition for the parking air conditioning mode in step four is as follows: after the engine is turned off, the circuit interlock control terminal of the air conditioning system unlocks, allowing the power input terminal of the air conditioning system to send an electrical signal to the ISG motor, thus connecting the overall circuit of the air conditioning system. At this time, the parking air conditioning mode is ready to start. When the engine is running, the circuit interlock control terminal is locked, and the power input terminal cannot send an electrical signal to the ISG motor. At this time, the system is open-circuited, and the parking air conditioning mode cannot start. Only when the engine is turned off and the circuit interlock control terminal is unlocked can the power input terminal send an electrical signal to the ISG motor, connecting the system circuit and enabling the parking air conditioning mode to start. This protects the battery, extends battery life, and saves fuel consumption.

[0038] like Figure 2 As shown, a system for starting the parking air conditioner of an engineering vehicle includes an ECU controller, a relay assembly, and a vehicle system assembly connected to each other. The vehicle system assembly includes an air conditioning system battery, an engine, an ISG motor, a clutch, an air conditioning compressor, a parking air conditioning mode switch, a temperature sensor, and a transmission device. The relay assembly includes a power activation relay assembly, an output relay assembly, and a circuit interlock relay assembly. The engine, ISG motor, and air conditioning compressor are connected by a transmission device, and a clutch is provided between the engine and the transmission device. The temperature sensor is connected to the ECU controller signal, and the air conditioning system battery is connected to the relay assembly through a parking air conditioning mode switch. The power activation relay assembly is connected to the output relay assembly and supplies power to the output relay assembly. The circuit interlock relay assembly is connected to the output relay assembly to control the on / off state of the output relay assembly.

[0039] Firstly, the engine, ISG motor, and air conditioning compressor are connected via a transmission device. A clutch is installed between the engine crankshaft and the transmission device. When the ISG motor is used as an electric motor, the clutch disengages from the engine crankshaft, and the clutch idles with the transmission device. The electric motor drives the transmission device to rotate the air conditioning compressor. When the ISG motor is used as a generator, the clutch connects to the engine crankshaft, and the crankshaft drives the transmission device to rotate the ISG motor, thereby charging the air conditioning system battery. At the same time, the engine drives the transmission device to rotate the air conditioning compressor, activating the driving air conditioning mode. In this embodiment, the transmission device is a belt drive. In this embodiment, the vehicle system assembly also includes a vehicle battery. To prevent the vehicle battery from running out of power, the air conditioning system battery is used as a backup power source. The air conditioning system battery is connected in parallel with the vehicle battery. When the vehicle battery runs out of power, the ECU controller selects to activate the air conditioning system battery to power the vehicle. At the same time, the engine drives the ISG motor to charge the vehicle battery.

[0040] After the temperature sensor detects that the interior temperature has reached the set temperature for starting the parking air conditioning mode, it sends a signal to the ECU controller. The ECU controller then controls the parking air conditioning mode switch to close, thereby powering on the parking air conditioning system. Starting the engine activates the power supply and relay assembly, keeping the parking air conditioning mode continuously powered. The circuit interlock relay assembly switches between locked and unlocked states to ensure the engine is locked when the parking air conditioning mode is activated. When the engine is unlocked, the parking air conditioning mode cannot be activated; the driving air conditioning mode can only be activated by starting the engine. When the circuit interlock relay assembly is unlocked, the output relay assembly closes, forming a circuit, thus activating the parking air conditioning mode. Here, "locked" means the engine has the starting function but cannot be started due to being locked and requires unlocking; "unlocked" means the engine is startable and can be started at any time.

[0041] To ensure that the parking air conditioning mode remains powered even after the engine is turned off, the power activation relay assembly includes a first relay and a second relay. The output terminal of the first relay is connected to the control terminal and output terminal of the second relay, and the input terminal of the second relay is connected to the air conditioning system battery. When the control terminal of the second relay is energized, the second relay self-locks.

[0042] To activate the parking air conditioning mode, the output relay assembly includes a third relay. The output terminal of the second relay is connected to the control terminal and input terminal of the third relay and supplies power to the third relay. The output terminal of the third relay is connected to the ISG motor.

[0043] To protect the circuit, the circuit interlock relay assembly includes a fourth relay and a fifth relay. The input terminal of the fourth relay is connected to the control terminal of the third relay, and the output control terminal of the fourth relay is connected to the output terminal of the fifth relay. The input control terminal of the fourth relay is connected to the ISG motor or grounded. The input terminal of the fifth relay is connected to the air conditioning system battery, and the control terminal of the fifth relay is connected to the ECU controller.

[0044] For the third relay to send an electrical signal to the ISG motor, its 86 control terminal must be activated. This 86 control terminal is connected to the 30 input terminal of the fourth relay. For the fourth relay to activate, its 86 output control terminal must be energized. This 86 output control terminal is connected to the output terminal of the fifth relay. If the fifth relay's output terminal is energized, its control terminal must not be energized and engaged. If the fifth relay's control terminal is not energized, the engine cannot be unlocked; otherwise, the circuit interlock relay assembly returns to the locked state. When the engine sends a start signal S, the fifth relay's control terminal engages, and its 30 input terminal connects to pin 87. Only when the engine is locked (not started) is the input terminal 30 of the fifth relay connected to the output terminal, thereby unlocking the circuit interlock relay assembly. This allows the control terminal of the third relay to be energized and energized, sending an electrical signal to the ISG motor to activate the parking air conditioning mode. When the ISG motor is used as an electric motor, the control terminal 85 of the fourth relay is grounded to the D+ signal. When the ISG motor is used as a generator, the control terminal 85 of the fourth relay is connected to the ISG motor and receives the B+ signal to charge the vehicle battery or the air conditioning system battery. When the engine is started, the ISG motor is in generator mode. After the engine is turned off, the ISG motor stops generator mode and switches to electric mode upon receiving power.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0046] 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 starting the air conditioner while the engineering vehicle is parked, characterized in that: Includes the following steps: Step 1: Determine if the vehicle has the power-on conditions to start the parking air conditioning mode: The ECU controller detects the battery level of the air conditioning system and determines if the battery is low. If so, it controls the engine to start the driving air conditioning mode and charges the air conditioning system battery through the ISG motor; if not, the vehicle has the power-on conditions to start the parking air conditioning mode and proceeds to Step 2. Step 2: Powering on the air conditioning system: Check if the temperature inside the driver's cab has reached the set temperature for starting the parking air conditioning mode. If so, send a power-on signal to the ECU controller, which will then power on the air conditioning system and proceed to Step 3. If not, the air conditioning system will not be powered on, and the operator can manually power on the system. Step 3: Start the engine: Check if the air conditioning system is not started. If so, the operator starts the engine, and the ECU controller sends an activation signal to the air conditioning system to provide the activation conditions for the air conditioning system to start, then proceed to Step 4; if not, the engine is locked. Step 4: Engine shutdown: The operator shuts off the engine, turning off the entire vehicle and making the parking air conditioning mode ready to start, then proceeds to Step 5; Step 5: Activate parking air conditioning mode: The air conditioning system is powered on, and the ISG motor drives the air conditioning system to activate the parking air conditioning mode. The ECU controller controls the engine to be locked when the parking air conditioning mode is activated.

2. The method for starting the air conditioning in a parking vehicle according to claim 1, characterized in that: In step one, the parking air conditioning mode is powered by the air conditioning system battery to the ISG motor, and the ISG motor drives the air conditioning system to start; the driving air conditioning mode is driven by the engine to start the air conditioning system, and at the same time, the air conditioning system battery is charged through the ISG motor.

3. The method for starting the air conditioner of a parking engineering vehicle according to claim 2, characterized in that: The activation condition for starting the air conditioning system in step three is that the power input terminal of the air conditioning system is connected and self-locked, and the circuit interlock control terminal of the air conditioning system is in a locked state at this time, so that the power input terminal of the air conditioning system remains connected after the engine is turned off in step four.

4. The method for starting the air conditioner of a parking engineering vehicle according to claim 3, characterized in that: The activation condition for the parking air conditioning mode in step four is that after the engine is turned off, the circuit interlock control terminal of the air conditioning system is unlocked, so that the power input terminal of the air conditioning system sends an electrical signal to the ISG motor, and the overall circuit of the air conditioning system is connected. At this time, the parking air conditioning mode is ready to start.

5. A system for implementing the method for starting the parking air conditioner of an engineering vehicle according to any one of claims 1-4, characterized in that, It includes an interconnected ECU controller, relay assembly, and vehicle system assembly. The vehicle system assembly includes an air conditioning system battery, engine, ISG motor, clutch, air conditioning compressor, parking air conditioning mode switch, temperature sensor, and transmission device. The relay assembly includes a power activation relay assembly, an output relay assembly, and a circuit interlock relay assembly. The engine, ISG motor, and air conditioning compressor are connected by a transmission device, and a clutch is provided between the engine and the transmission device. The temperature sensor is connected to the ECU controller signal, and the air conditioning system battery is connected to the relay assembly through a parking air conditioning mode switch. The power activation relay assembly is connected to the output relay assembly and supplies power to the output relay assembly. The circuit interlock relay assembly is connected to the output relay assembly to control the on / off state of the output relay assembly.

6. The system for implementing the method of starting the air conditioner in a parking engineering vehicle according to claim 5, characterized in that: The power activation relay assembly includes a first relay and a second relay. The output terminal of the first relay is connected to the control terminal and the output terminal of the second relay. The input terminal of the second relay is connected to the air conditioning system battery. When the control terminal of the second relay is energized, the second relay self-locks.

7. The system for implementing the method of starting the air conditioner in a parking engineering vehicle according to claim 6, characterized in that: The output relay assembly includes a third relay, the output terminal of the second relay is connected to the control terminal and input terminal of the third relay and supplies power to the third relay, and the output terminal of the third relay is connected to the ISG motor.

8. The system for implementing the method of starting the air conditioner in a parking engineering vehicle according to claim 7, characterized in that: The circuit interlock relay assembly includes a fourth relay and a fifth relay. The input terminal of the fourth relay is connected to the control terminal of the third relay, and the output control terminal of the fourth relay is connected to the output terminal of the fifth relay. The input control terminal of the fourth relay is connected to the ISG motor or grounded. The input terminal of the fifth relay is connected to the air conditioning system battery, and the control terminal of the fifth relay is connected to the ECU controller.

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