Intelligent thermal management control system and method

Abstract

The invention relates to an intelligent thermal management control system and method, and a fan, a starting system, an instrument system, a retarder system, an air conditioning system and an engine control system (ECM) are in communication with the intelligent thermal management control system or are in hard wire connection with the intelligent thermal management control system. The intelligent heat management control system automatically selects different fan control schemes according to different input signal states of a starting system, an instrument system, a retarder system, an air conditioning system and an engine control system (ECM) and cooling requirements of the retarder system, the air conditioning system and the engine control system (ECM) in combination with the type of the cooling system, the environment temperature and the vehicle speed. Controlling the fan to execute different rotating speeds; the limp function is achieved, the optimal cooling requirement of the vehicle under different working conditions and different vehicle speeds can be met, the accessory power consumption is reduced, meanwhile, the fuel consumption rate is reduced, and the intelligent heat management control requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile thermal management, and in particular to an intelligent thermal management control system and method. Background Art

[0002] Traditional thermal management control systems use electronic fans for step-by-step adjustment based on coolant temperature and intake air temperature, or use electronically controlled silicone oil fans for single linear adjustment. With the development of the commercial vehicle industry, there are more and more types of power systems and cooling demand units, and the requirements for cooling systems under different environmental conditions and vehicle speeds are becoming more and more complex. Traditional thermal management control systems can no longer meet the complex cooling requirements of various types of power systems, cooling demand units, and different environmental conditions and vehicle speeds. If cooling control cannot be performed accurately, effectively, and safely, the cooling demand unit will be in a high temperature state, damaging the cooling demand unit or increasing the energy consumption of the entire vehicle. Summary of the invention

[0003] The purpose of the present invention is to provide an intelligent thermal management control system and method in view of the deficiencies in the prior art.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] An intelligent thermal management control system, including a fan, a starting system, an instrument system, a retarder system, an air conditioning system, an engine control system ECM and an intelligent thermal management control system;

[0006] The fan, the starting system, the instrument system, the retarder system, the air-conditioning system, and the engine control system ECM communicate or are hard-wired with the intelligent thermal management control system. The intelligent thermal management control system automatically selects different fan control schemes based on different input signal states of the starting system, the instrument system, the retarder system, the air-conditioning system, and the engine control system ECM and the cooling requirements of the retarder system, the air-conditioning system, and the engine control system ECM, in combination with the cooling system type, ambient temperature, and vehicle speed, to control the fan to execute different speeds.

[0007] As a further explanation of the invention, a fan speed sensor is provided on the fan, and the fan speed sensor is used to convert the frequency signal into an electrical signal and transmit it to the intelligent thermal management control system. The intelligent thermal management control system calculates the actual speed of the fan based on the converted electrical signal through filtering and formula.

[0008] As a further description of the invention, the starting system is arranged in the cab, and is used to transmit or send the key gear position signal of the starting system to the intelligent thermal management control system in the form of an electrical signal or a CAN message signal.

[0009] As a further description of the invention, the instrument system is arranged in the cab and is used to send vehicle information, real-time vehicle speed information and fault alarm information to the intelligent thermal management control system in the form of CAN message signals.

[0010] As a further description of the invention, the retarder system includes a retarder controller, which is arranged in the cab and is used to send the retarder switch gear information, the retarder actual torque percentage information, and the retarder coolant outlet temperature information to the intelligent thermal management control system in the form of CAN message signals.

[0011] As a further description of the invention, the air-conditioning system includes an air-conditioning controller, which is arranged in the cab and is used to transmit or send the air-conditioning three-state pressure switch status information, condenser pressure value information, air-conditioning switch status information and indoor and outdoor temperature information to the intelligent thermal management control system in the form of electrical signals or CAN message signals.

[0012] As a further description of the invention, the engine control system ECM is arranged on the vehicle frame engine, and is used to send engine speed information, engine intake temperature information and engine coolant temperature information to the intelligent thermal management control system in the form of CAN message signals.

[0013] An intelligent thermal management control method, based on a vehicle configuration word flashing method, the intelligent thermal management control system can automatically adapt to different types of retarder systems, air conditioning systems, and engine control system ECM; the method includes:

[0014] The intelligent thermal management control system obtains the key position signal in the starting system;

[0015] When the intelligent thermal management control system detects that the vehicle is in the starting state, the intelligent thermal management control system obtains the fan sensor electrical signal and calculates the current actual fan speed;

[0016] The intelligent thermal management control system obtains the indoor and outdoor temperature information of the air conditioning system, automatically adapts the winter or summer control method, and dynamically adjusts the engine coolant temperature, the engine intake temperature table corresponding to different fan target speeds and the fan direct temperature threshold; and the intelligent thermal management control system obtains the air conditioning switch status information, the air conditioning three-state pressure switch status information and the condenser pressure value information related electrical signals of the air conditioning system; or the intelligent thermal management control system receives the message signal related to the cooling request fan speed percentage sent by the air conditioning system, and automatically selects the fan control scheme corresponding to different fan target speeds, and when the vehicle speed sent by the instrument system is different, the corresponding fan target speed is different;

[0017] The intelligent thermal management control system obtains the electrical signal related to the retarder switch gear of the retarder system and the message signal related to the actual torque percentage information of the retarder, so that the fan uses the maximum fan speed under the current engine speed as the fan target speed; or the intelligent thermal management control system receives the message signal related to the cooling request fan speed percentage of the retarder system, and automatically selects the fan control scheme corresponding to different fan target speeds; and the intelligent thermal management control system calculates the calling time of the retarder system by combined braking, and when the calling time is greater than the set threshold and the retarder coolant outlet temperature is greater than the fan direct connection temperature; the fan uses the maximum fan speed under the current engine speed as the fan target speed;

[0018] The intelligent thermal management control system selects the maximum value of the fan target speed corresponding to the engine system, air-conditioning system, retarder system, and combined brake calling retarder system as the fan's final target speed, controls the fan request duty cycle PWM frequency signal, and then controls the fan operation. According to the difference between the fan's final target speed and the current actual fan speed, based on PID control adjustment, the fan request duty cycle PWM frequency signal is dynamically adjusted to make the fan's actual speed approach the fan's target fan speed; when the fan target speed exceeds the physical maximum value, the physical maximum value is used as the fan target speed.

[0019] As a further illustration of the invention, the intelligent thermal management control system obtains the electric signal of the fan sensor and calculates the actual speed of the current fan; including:

[0020] The intelligent thermal management control system obtains the electrical signal converted from the fan sensor frequency signal, and after filtering, sets the effective low-level voltage to low effective when it is less than the set threshold, and sets the effective high-level voltage to high effective when it is greater than the set threshold. Combined with the n pulses per revolution determined by the mechanical characteristics of the fan, the current actual fan speed calculation formula is:

[0021] The actual current fan speed = (number of pulses ÷ counting time) × 60 ÷ (number of pulses per revolution).

[0022] As a further explanation of the invention, based on PID control regulation, the fan request duty cycle PWM frequency signal is dynamically adjusted to make the actual fan speed approach the fan target fan speed; including

[0023] The intelligent thermal management control system selects the P / I / D control parameters according to the hysteresis of the difference between the fan's final target speed and the current actual fan speed. When the speed difference is greater than the set speed, proportional P adjustment is performed; when the speed difference is less than the set speed, integral I and differential D adjustment are performed. The fan request duty cycle PWM frequency signal is adjusted through P / I / D control to make the actual fan speed approach the target speed quickly and smoothly. The P / I / D adjustment value is configured and flashed according to different models of retarder systems, air conditioning systems, and engine control system ECM, and different control values ​​are automatically selected.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The present invention has a limp home function, and comprehensively considers the fan, starting system, instrument system, retarder system, air conditioning system, and engine control system ECM; the intelligent thermal management control system automatically selects different control paths and controls the fan to execute different speeds according to different input signal states of the starting system, instrument system, retarder system, air conditioning system, and engine control system ECM and the cooling requirements of the retarder system, air conditioning system, and engine control system ECM, combined with factors such as the cooling system type, ambient temperature, and vehicle speed; the present invention makes comprehensive decisions based on multiple types of cooling requirements, automatically adjusts the control strategy, controls the fan speed, and achieves the best cooling requirements for the vehicle under different working conditions and different vehicle speeds, reduces the power consumption of accessories, and reduces the fuel consumption rate, thereby meeting the requirements of intelligent thermal management control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the principle of the intelligent thermal management control system of the present invention. DETAILED DESCRIPTION

[0027] Example 1

[0028] An intelligent thermal management control system, including a fan, a starting system, an instrument system, a retarder system, an air conditioning system, an engine control system ECM and an intelligent thermal management control system;

[0029] The fan, starting system, instrument system, retarder system, air conditioning system, engine control system ECM communicate or are hard-wired with the intelligent thermal management control system. The intelligent thermal management control system automatically selects different fan control schemes based on different input signal states of the starting system, instrument system, retarder system, air conditioning system, engine control system ECM and cooling requirements of the retarder system, air conditioning system, engine control system ECM, combined with the cooling system type, ambient temperature, and vehicle speed, to control the fan to execute different speeds.

[0030] The fan is provided with a fan speed sensor, which is used to convert the frequency signal into an electrical signal and transmit it to the intelligent thermal management control system. The intelligent thermal management control system calculates the actual speed of the fan based on the converted electrical signal through filtering and formula.

[0031] The starting system is arranged in the cab and is used to transmit or send the key position signal of the starting system to the intelligent thermal management control system in the form of an electrical signal or a CAN message signal.

[0032] The instrument system is installed in the cab and is used to send vehicle information, real-time vehicle speed information and fault alarm information to the intelligent thermal management control system in the form of CAN message signals.

[0033] The retarder system includes a retarder controller, which is arranged in the cab and is used to send the retarder switch gear information, the retarder actual torque percentage information, and the retarder coolant outlet temperature information to the intelligent thermal management control system in the form of CAN message signals.

[0034] The air conditioning system includes an air conditioning controller, which is arranged in the cab and is used to transmit or send the air conditioning three-state pressure switch status information, condenser pressure value information, air conditioning switch status information and indoor and outdoor temperature information to the intelligent thermal management control system in the form of electrical signals or CAN message signals.

[0035] The engine control system ECM is set on the frame engine and is used to send engine speed information, engine intake temperature information and engine coolant temperature information to the intelligent thermal management control system in the form of CAN message signals.

[0036] Example 2

[0037] An intelligent thermal management control method is provided. Based on a vehicle configuration word flashing method, the intelligent thermal management control system can automatically adapt to different types of retarder systems, air conditioning systems, and engine control system ECMs. The method includes:

[0038] The intelligent thermal management control system obtains the key position signal in the starting system;

[0039] When the intelligent thermal management control system detects that the vehicle is in the starting state, the intelligent thermal management control system obtains the fan sensor electrical signal and calculates the current actual fan speed;

[0040] The intelligent thermal management control system obtains the indoor and outdoor temperature information of the air conditioning system, automatically adapts the winter or summer control method, and dynamically adjusts the engine coolant temperature, the engine intake temperature table corresponding to different fan target speeds and the fan direct temperature threshold; and the intelligent thermal management control system obtains the air conditioning switch status information, the air conditioning three-state pressure switch status information and the condenser pressure value information related electrical signals of the air conditioning system; or the intelligent thermal management control system receives the message signal related to the cooling request fan speed percentage sent by the air conditioning system, and automatically selects the fan control scheme corresponding to different fan target speeds, and when the vehicle speed sent by the instrument system is different, the corresponding fan target speed is different;

[0041] The intelligent thermal management control system obtains the electrical signal related to the retarder switch gear of the retarder system and the message signal related to the actual torque percentage information of the retarder, so that the fan uses the maximum fan speed under the current engine speed as the fan target speed; or the intelligent thermal management control system receives the message signal related to the cooling request fan speed percentage of the retarder system, and automatically selects the fan control scheme corresponding to different fan target speeds; and the intelligent thermal management control system calculates the calling time of the retarder system by combined braking, and when the calling time is greater than the set threshold and the retarder coolant outlet temperature is greater than the fan direct connection temperature; the fan uses the maximum fan speed under the current engine speed as the fan target speed;

[0042] The intelligent thermal management control system selects the maximum value of the fan target speed corresponding to the engine system, air conditioning system, retarder system, and combined brake call retarder system as the fan's final target speed, controls the fan request duty cycle PWM frequency signal, and then controls the fan operation. According to the difference between the fan's final target speed and the current fan's actual speed, based on PID control adjustment, the fan request duty cycle PWM frequency signal is dynamically adjusted to make the fan's actual speed approach the fan's target fan speed; when the fan's target speed exceeds the physical maximum value, the physical maximum value is used as the fan's target speed. Due to the fan's own characteristics, its response speed sensitivity is not high. The intelligent thermal management control system, through the above control method, when the system detects that a larger fan speed needs to be increased, at the beginning of the control, by increasing the PWM frequency signal, the electronically controlled silicone oil fan clutch valve plate is controlled to open a larger opening or fully open, and the time of opening a larger opening or fully opening is accurately controlled, and then restored to the PWM frequency signal calculated by the above principle, to solve the problem of low response speed sensitivity caused by the electronically controlled silicone oil fan's own characteristics, and improve the response rate.

[0043] The intelligent thermal management control system obtains the fan sensor electrical signal and calculates the actual fan speed; including:

[0044] The intelligent thermal management control system obtains the electrical signal converted from the fan sensor frequency signal, and after filtering, sets the effective low-level voltage to low effective when it is less than the set threshold, and sets the effective high-level voltage to high effective when it is greater than the set threshold. Combined with the n pulses per revolution determined by the mechanical characteristics of the fan, the current actual fan speed calculation formula is:

[0045] The actual current fan speed = (number of pulses ÷ counting time) × 60 ÷ (number of pulses per revolution).

[0046] Based on PID control regulation, dynamically adjust the fan request duty cycle PWM frequency signal to make the actual fan speed close to the fan target fan speed; including

[0047] The intelligent thermal management control system selects the P / I / D control parameters according to the hysteresis of the difference between the fan's final target speed and the current actual fan speed. When the speed difference is greater than the set speed, proportional P adjustment is performed; when the speed difference is less than the set speed, integral I and differential D adjustment are performed. The fan request duty cycle PWM frequency signal is adjusted through P / I / D control to make the actual fan speed approach the target speed quickly and smoothly. The P / I / D adjustment value is configured and flashed according to different models of retarder systems, air conditioning systems, and engine control system ECM, and different control values ​​are automatically selected.

[0048] As described above, the present invention has a limp home function, taking into account the fan, starting system, instrument system, retarder system, air conditioning system, and engine control system ECM; the intelligent thermal management control system automatically selects different control paths and controls the fan to execute different speeds according to the different input signal states of the starting system, instrument system, retarder system, air conditioning system, and engine control system ECM and the cooling requirements of the retarder system, air conditioning system, and engine control system ECM, combined with factors such as the cooling system type, ambient temperature, and vehicle speed; the present invention makes comprehensive decisions based on a variety of cooling requirements, automatically adjusts the control strategy, controls the fan speed, and achieves the best cooling requirements for the vehicle under different working conditions and different vehicle speeds, reduces the power consumption of accessories, and reduces the fuel consumption rate, thereby meeting the requirements of intelligent thermal management control.

Claims

1. An intelligent thermal management control system, characterized in that: Including fan, starting system, instrument system, retarder system, air conditioning system, engine control system ECM and intelligent thermal management control system; The fan, the starting system, the instrument system, the retarder system, the air-conditioning system, and the engine control system ECM communicate or are hard-wired with the intelligent thermal management control system. The intelligent thermal management control system automatically selects different fan control schemes based on different input signal states of the starting system, the instrument system, the retarder system, the air-conditioning system, and the engine control system ECM and the cooling requirements of the retarder system, the air-conditioning system, and the engine control system ECM, in combination with the cooling system type, ambient temperature, and vehicle speed, to control the fan to execute different speeds.

2. The intelligent thermal management control system according to claim 1, characterized in that: The fan is provided with a fan speed sensor, which is used to convert a frequency signal into an electrical signal and transmit it to the intelligent thermal management control system. The intelligent thermal management control system calculates the actual speed of the fan based on the converted electrical signal through filtering and formula.

3. The intelligent thermal management control system according to claim 2, characterized in that: The starting system is arranged in the cab and is used to transmit or send the key position signal of the starting system to the intelligent thermal management control system in the form of an electrical signal or a CAN message signal.

4. The intelligent thermal management control system according to claim 3, characterized in that: The instrument system is arranged in the cab and is used to send vehicle information, real-time vehicle speed information and fault alarm information to the intelligent thermal management control system in the form of CAN message signals.

5. The intelligent thermal management control system according to claim 4, characterized in that: The retarder system includes a retarder controller, which is arranged in the cab and is used to send the retarder switch gear information, the retarder actual torque percentage information, and the retarder coolant outlet temperature information to the intelligent thermal management control system in the form of CAN message signals.

6. The intelligent thermal management control system according to claim 5, characterized in that: The air-conditioning system includes an air-conditioning controller, which is arranged in the driving cab and is used to transmit or send the air-conditioning three-state pressure switch status information, condenser pressure value information, air-conditioning switch status information and indoor and outdoor temperature information to the intelligent thermal management control system in the form of electrical signals or CAN message signals.

7. The intelligent thermal management control system according to claim 6, characterized in that: The engine control system ECM is arranged on the vehicle frame engine and is used to send engine speed information, engine intake air temperature information and engine coolant temperature information to the intelligent thermal management control system in the form of CAN message signals.

8. An intelligent thermal management control method, comprising the intelligent thermal management control system according to any one of claims 1 to 7, characterized in that: Based on the vehicle configuration word flashing method, the intelligent thermal management control system can automatically adapt to different types of retarder systems, air conditioning systems, and engine control system ECM; the method includes: The intelligent thermal management control system obtains the key position signal in the starting system; When the intelligent thermal management control system detects that the vehicle is in the starting state, the intelligent thermal management control system obtains the fan sensor electrical signal and calculates the current actual fan speed; The intelligent thermal management control system obtains the indoor and outdoor temperature information of the air conditioning system, automatically adapts the winter or summer control method, and dynamically adjusts the engine coolant temperature, the engine intake temperature table corresponding to different fan target speeds and the fan direct temperature threshold; and the intelligent thermal management control system obtains the air conditioning switch status information, the air conditioning three-state pressure switch status information and the condenser pressure value information related electrical signals of the air conditioning system; or the intelligent thermal management control system receives the message signal related to the cooling request fan speed percentage sent by the air conditioning system, and automatically selects the fan control scheme corresponding to different fan target speeds, and when the vehicle speed sent by the instrument system is different, the corresponding fan target speed is different; The intelligent thermal management control system obtains the electrical signal related to the retarder switch gear of the retarder system and the message signal related to the actual torque percentage information of the retarder, so that the fan uses the maximum fan speed under the current engine speed as the fan target speed; or the intelligent thermal management control system receives the message signal related to the cooling request fan speed percentage of the retarder system, and automatically selects the fan control scheme corresponding to different fan target speeds; and the intelligent thermal management control system calculates the calling time of the retarder system by combined braking, and when the calling time is greater than the set threshold and the retarder coolant outlet temperature is greater than the fan direct connection temperature; the fan uses the maximum fan speed under the current engine speed as the fan target speed; The intelligent thermal management control system selects the maximum value of the fan target speed corresponding to the engine system, air-conditioning system, retarder system, and combined brake calling retarder system as the fan's final target speed, controls the fan request duty cycle PWM frequency signal, and then controls the fan operation. According to the difference between the fan's final target speed and the current actual fan speed, based on PID control adjustment, the fan request duty cycle PWM frequency signal is dynamically adjusted to make the fan's actual speed approach the fan's target fan speed; when the fan target speed exceeds the physical maximum value, the physical maximum value is used as the fan target speed.

9. The intelligent thermal management control method according to claim 8, characterized in that: The intelligent thermal management control system obtains the fan sensor electrical signal and calculates the actual fan speed; including: The intelligent thermal management control system obtains the electrical signal converted from the fan sensor frequency signal, and after filtering, sets the effective low-level voltage to low effective when it is less than the set threshold, and sets the effective high-level voltage to high effective when it is greater than the set threshold. Combined with the n pulses per revolution determined by the mechanical characteristics of the fan, the current actual fan speed calculation formula is: The actual current fan speed = (number of pulses ÷ counting time) × 60 ÷ (number of pulses per revolution).

10. The intelligent thermal management control method according to claim 9, characterized in that: Based on PID control regulation, the fan request duty cycle PWM frequency signal is dynamically adjusted to make the actual fan speed close to the fan target fan speed; include The intelligent thermal management control system selects the P / I / D control parameters according to the hysteresis loop of the difference between the fan's final target speed and the current actual fan speed. When the speed difference is greater than the set speed, proportional P adjustment is performed; when the speed difference is less than the set speed, integral I and differential D adjustment are performed. The fan request duty cycle PWM frequency signal is adjusted through P / I / D control, so that the actual fan speed quickly and steadily approaches the target speed. The P / I / D adjustment values ​​are configured and flashed according to different models of retarder systems, air conditioning systems, and engine control system ECM, and different control values ​​are automatically selected.

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