Silicone oil clutch fan control method and device

Abstract

The invention discloses a silicone oil clutch fan control method and device. The method comprises the steps that an engine air inlet temperature signal, a fan actual rotating speed signal, an engine cooling water temperature signal, an engine torque signal and an engine rotating speed signal are obtained; according to the engine air inlet temperature signal and the fan actual rotating speed signal, the engine air inlet temperature and the fan actual rotating speed are determined; according to the engine torque signal, the engine rotating speed signal and the cooling water temperature signal, the fan duty ratio needed by water outlet temperature cooling is determined, and according to the air inlet temperature signal, the fan duty ratio needed by air temperature cooling is determined; and determining a target fan duty ratio according to the fan duty ratio required for water temperature cooling and the fan duty ratio required for temperature cooling, determining a target rotating speed according to the target fan duty ratio, and controlling the fan to be adjusted to the target rotating speed from the actual rotating speed of the fan. The problems that in the prior art, due to the fact that an electronic control silicone oil clutch fan is imperfect in control strategy, heat of an engine is prone to being accumulated, cooling is not timely, oil consumption is high, and the engine breaks down are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a method and device for controlling a silicone oil clutch fan. Background Art

[0002] Currently, the engine cooling of the thermal management system of fuel light trucks on the market generally has a silicone oil fan. The silicone oil fan is driven by the rotation of the engine crankshaft, and its speed will change with the change of engine speed.

[0003] In the prior art, the electronically controlled silicone oil clutch fan is prone to heat accumulation in the engine and untimely cooling due to an imperfect control strategy, which leads to high fuel consumption, engine failure and other problems. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a silicone oil clutch fan control method and device, aiming to solve the problems of the electronically controlled silicone oil clutch fan in the prior art, which is prone to engine heat accumulation and untimely cooling due to imperfect control strategy, resulting in high fuel consumption, engine failure and other problems.

[0005] An object of the present invention is to provide a method for controlling a silicone oil clutch fan, the method comprising: Obtaining engine intake air temperature signal, fan actual speed signal, engine cooling water temperature signal, engine torque signal and engine speed signal; Determine the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; Determine the fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determine the fan duty ratio required for air temperature cooling according to the intake air temperature signal; The target fan duty cycle is determined according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling, and the target speed is determined according to the target fan duty cycle, and the fan is controlled to adjust from the actual fan speed to the target speed.

[0006] Furthermore, in the above-mentioned silicone oil clutch fan control method, the steps of respectively determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal include: Obtaining an air intake temperature voltage signal Umeasured collected by an air intake temperature sensor arranged at the air intake of the engine; Obtaining the internal voltage of the intake air temperature sensor and the pull-up resistor R solid, determining the corresponding temperature resistance through a voltage division formula according to the voltage signal U test, the internal voltage of the intake air temperature sensor and the pull-up resistor R solid, and finding the engine intake air temperature corresponding to the temperature resistance in a preset resistance-temperature MAP; Among them, the expression of the voltage division formula is: Rhot = Rsolid*Utest / (Uinternal-Utest); Among them, Rhot is the temperature resistor, Rsolid is the pull-up resistor, Umeasure is the voltage signal, and Uinside is the internal voltage of the intake air temperature sensor.

[0007] Furthermore, in the above-mentioned silicone oil clutch fan control method, the step of determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal, respectively, further comprises: A continuous speed pulse signal collected by a fan speed sensor arranged on the fan is obtained, and the actual speed of the fan is determined according to the corresponding relationship between the speed pulse signal and the fan speed.

[0008] Furthermore, in the above-mentioned silicone oil clutch fan control method, the step of determining the fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining the fan duty ratio required for air temperature cooling according to the intake air temperature signal comprises: Searching and determining the target water temperature in the engine low fuel consumption water temperature target MAP according to the engine torque signal and the engine speed signal; Receive the engine water temperature signal, set it as the actual water temperature, and determine the fan duty cycle required for cooling the outlet water temperature based on the difference between the target water temperature and the actual water temperature in the fan control MAP; Receive the intake air temperature signal and set it as the actual intercooler temperature. According to the intercooler temperature-fan duty cycle table, determine the fan duty cycle required for air temperature cooling.

[0009] Furthermore, in the above-mentioned silicone oil clutch fan control method, the step of determining the target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling comprises: The maximum value of the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling is used as the target fan duty cycle.

[0010] Furthermore, in the above-mentioned silicone oil clutch fan control method, the step of determining the target speed according to the target fan duty cycle and controlling the fan to adjust from the actual fan speed to the target speed includes: When the engine speed is less than the first threshold, the target speed is the maximum fan speed at the current engine speed*the engine cooling function output duty cycle; When the engine speed is greater than the first threshold, the target speed is the maximum speed of the fan at the current engine speed; The maximum fan speed is the fan input speed*the fan mesh ratio, and the fan mesh ratio is obtained by searching the corresponding engine speed in the engine speed-mesh ratio MAP.

[0011] Furthermore, the above-mentioned silicone oil clutch fan control method, wherein the method also includes: The difference between the target speed and the actual speed of the fan is obtained, and the control quantity calculated by the PID control algorithm is combined with the current actual speed to obtain the final duty cycle, which is used to adjust the fan speed so that it follows the target speed.

[0012] Another object of the present invention is to provide a silicone oil clutch fan control device, the device comprising: An acquisition module, used to acquire an engine intake air temperature signal, a fan actual speed signal, an engine cooling water temperature signal, an engine torque signal, and an engine speed signal; A determination module, used to determine the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; a calculation module, for determining a fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining a fan duty ratio required for air temperature cooling according to the intake air temperature signal; The control module is used to determine the target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling, determine the target speed according to the target fan duty cycle, and control the fan to adjust from the actual fan speed to the target speed.

[0013] Another object of the present invention is to provide an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0014] The present invention obtains the engine intake temperature signal, the fan actual speed signal, the engine cooling water temperature signal, the engine torque signal and the engine speed signal; determines the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; determines the fan duty ratio required for water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determines the fan duty ratio required for air temperature cooling according to the intake temperature signal; determines the target fan duty ratio according to the fan duty ratio required for water temperature cooling and the fan duty ratio required for temperature cooling, determines the target speed according to the target fan duty ratio, and controls the fan to adjust from the fan actual speed to the target speed. Under the premise of ensuring a balance between energy consumption and cooling function, the fan speed, i.e., the engine speed, is precisely controlled. The present invention solves the problems of the electric-controlled silicone oil clutch fan in the prior art, which is easy to cause engine heat accumulation and untimely cooling due to imperfect control strategy, resulting in high fuel consumption and engine failure.

[0015] In addition, the present invention improves the cooling effect of the engine through the engine cooling function module; through the slip thermal protection function module, by setting the engine speed protection threshold, the protection of the electronically controlled silicone oil fan is effectively realized; through the engine target speed following function module, the target speed of the transmitter is timely responded, and the speed error is effectively reduced, thereby realizing more accurate target speed control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An interactive block diagram of a silicone oil clutch fan control system according to an embodiment of the present invention; Figure 2 Flow chart of the silicone oil clutch fan control method in the first embodiment of the present invention; Figure 3 4 is a structural block diagram of a silicone oil clutch fan control device in a third embodiment of the present invention.

[0017] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] See also Figure 1 , which is an interactive block diagram of a silicone oil clutch fan control system proposed in one embodiment of the present invention. Any embodiment of the present invention can be applied to Figure 1 In the interactive scenario shown, the silicone clutch fan control system (VCU) receives external input signals, which include hard-line input signals and CAN input signals. The hard-line input signals include engine intake temperature signals and fan actual speed signals; CAN input signals include engine cooling water temperature signals, engine torque, and engine speed signals. Specifically, the end of the fan assembly is directly connected to the front gear train of the engine through threads, and the clutch uses its internal high-viscosity silicone oil to transmit the torque provided by the front gear train to the fan for rotation. The clutch transmission efficiency depends on the PWM speed requirement sent by the VCU, and the PWM signal adjusts the actual speed of the fan. The PWM signal actually controls the degree of valve opening to control the transmission efficiency of the clutch. According to the opening state of the valve, the clutch can be divided into engaged state / semi-engaged state / disengaged state.

[0022] Engaged state: At this time, the PWM signal is 100%, the coil controls the valve to be fully open, and the fan speed is the maximum fan speed under the engine speed; Separation state: At this time, the PWM signal is 0%, the coil controls the valve to be fully closed, and the fan speed is the lowest speed; Semi-engaged state: The PWM signal is between 0 and 100%, which controls the valve opening and closing time, adjusts the clutch transmission efficiency, and the fan speed is adjustable between the highest and lowest speeds.

[0023] The fan demand speed (target speed) is the fan speed required under the vehicle state calibrated by the VCU, which is usually related to the water temperature and air conditioning pressure. When the actual fan speed is greater than (or lower than) the required speed, the actual fan speed is reduced (or increased) to the required speed through PID regulation. When the required speed is greater than the maximum fan speed, the PWM value is set to 100%, and the fan runs at the maximum speed.

[0024] The following will be combined with specific embodiments to illustrate how to solve the problems of the electronically controlled silicone oil clutch fan in the prior art, which may cause engine heat accumulation and untimely cooling due to imperfect control strategy, resulting in high fuel consumption, engine failure, etc.

[0025] Embodiment 1 See also Figure 2 , shown is a silicone oil clutch fan control method in a first embodiment of the present invention, the method includes steps S10~S11.

[0026] Step S10, obtaining an engine intake air temperature signal, a fan actual speed signal, an engine cooling water temperature signal, an engine torque signal, and an engine speed signal.

[0027] Among them, the collected signals include hard-wire input signals and CAN input signals. The hard-wire input signals include engine intake temperature signals and fan actual speed signals; the CAN input signals include three signals: engine cooling water temperature signals, engine torque and engine speed.

[0028] Step S11, determining the engine intake temperature and the fan actual speed respectively according to the engine intake temperature signal and the fan actual speed signal.

[0029] Among them, the acquisition of engine intake temperature and actual fan speed is an important part of the engine cooling function. Specifically, the engine intake temperature signal is obtained by connecting the intake temperature sensor at the bottom layer to the intake port temperature voltage signal Utest, obtain the internal voltage of the intake temperature sensor and the pull-up resistor Rsolid, and determine the corresponding temperature resistance through the voltage divider formula according to the voltage signal Utest, the internal voltage of the intake temperature sensor and the pull-up resistor Rsolid, and find the engine intake temperature corresponding to the temperature resistance in the preset resistance-temperature MAP; Among them, the expression of the voltage division formula is: Rhot = Rsolid*Utest / (Uinternal-Utest); Among them, Rhot is the temperature resistor, Rsolid is the pull-up resistor, Umeasure is the voltage signal, and Uinside is the internal voltage of the intake air temperature sensor.

[0030] The actual speed signal of the fan is obtained by receiving a continuous speed pulse signal from the speed sensor. The effective information is the frequency of the pulse signal. The actual speed of the fan is determined based on the correspondence between the speed pulse signal and the fan speed. For example, when the fan runs 1 revolution, the fan speed sensor sends a pulse train consisting of 6 pulses. The bottom layer sends the speed pulse frequency signal to the application layer. The application layer calculates the received pulse frequency signal and "6 pulses per revolution" to determine the actual speed of the fan. The calculation formula is: Speed ​​n (r / min) = pulse frequency f (Hz) × 10.

[0031] Step S12, determining the fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining the fan duty ratio required for air temperature cooling according to the intake air temperature signal.

[0032] Among them, in the fan control of the embodiment of the present invention, an engine cooling function is integrated, and the engine cooling function includes two parts: an engine outlet water temperature cooling function and an engine intake air temperature cooling function. Specifically, the engine torque signal and the engine speed signal are received. The target water temperature is determined according to the engine low fuel consumption water temperature target MAP. The engine water temperature signal is received and determined as the actual water temperature. The fan duty cycle required for the engine outlet water temperature cooling function is determined by subtracting (target water temperature - actual water temperature) from the electronic fan control MAP. In addition, in order to avoid repeated changes and rapid changes in the electronic fan, gradient processing is required. Exemplarily, the target MAP is shown in Table 1 below, and the electronic fan control MAP is shown in Table 2 below.

[0033] Table 1

[0034] Table 2

[0035] On the other hand, the intake air temperature signal sent by the intake air temperature sensor is received and determined as the actual intercooler temperature. According to the intercooler temperature & fan duty cycle table, the fan duty cycle required for the engine intake air temperature cooling function is determined. For example, the intercooler temperature-fan duty cycle table is shown in Table 3.

[0036] Table 3

[0037] Step S13, determining a target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling, determining a target speed according to the target fan duty cycle, and controlling the fan to adjust from the actual fan speed to the target speed.

[0038] The maximum value of the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling is taken as the target fan duty cycle, so as to determine the final target speed according to the target fan duty cycle, and control the fan to adjust from the actual speed to the target speed.

[0039] In summary, the present invention obtains the engine intake temperature signal, the fan actual speed signal, the engine cooling water temperature signal, the engine torque signal and the engine speed signal; determines the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; determines the fan duty ratio required for water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determines the fan duty ratio required for air temperature cooling according to the intake temperature signal; determines the target fan duty ratio according to the fan duty ratio required for water temperature cooling and the fan duty ratio required for temperature cooling, determines the target speed according to the target fan duty ratio, and controls the fan to adjust from the fan actual speed to the target speed. Under the premise of ensuring a balance between energy consumption and cooling function, it ensures accurate control of the fan speed, that is, the engine speed. It solves the problems of the electric-controlled silicone oil clutch fan in the prior art that the engine heat is easily accumulated and the cooling is not timely due to the imperfect control strategy, resulting in high fuel consumption and engine failure.

[0040] Embodiment 2 This embodiment also proposes a silicone oil clutch fan control method. The difference between the silicone oil clutch fan control method in this embodiment and the silicone oil clutch fan control method in the first embodiment is that: The step of determining a target speed according to the target fan duty cycle and controlling the fan to adjust from the actual fan speed to the target speed comprises: When the engine speed is less than the first threshold, the target speed is the maximum fan speed at the current engine speed*the engine cooling function output duty cycle; When the engine speed is greater than the first threshold, the target speed is the maximum speed of the fan at the current engine speed; Among them, the maximum fan speed is the fan input speed * fan mesh ratio, and the fan mesh ratio is obtained by searching the corresponding engine speed in the engine speed-mesh ratio MAP. The embodiment of the present invention is provided with a slip thermal protection function. When the engine speed is less than the threshold, for example, ≤2700rpm: the speed protection function is not triggered, and the output is the fan speed corresponding to the output duty cycle of the engine cooling function (the maximum fan speed at the current engine speed * the output duty cycle of the engine cooling function). When the engine speed is greater than 2700rpm: the speed protection function is triggered, and the function output is the maximum fan speed at the current engine speed (the speed corresponding to the duty cycle of 100%). The application layer receives the engine speed signal, and after obtaining the current engine speed, calculates the fan input speed; obtains the mesh ratio at the current engine speed according to the engine speed & mesh ratio MAP; and calculates the maximum fan speed as the output of the function. Among them: fan input speed = engine speed * coefficient, wherein the engine speed & mesh ratio MAP is shown in Table 4 below.

[0041]

[0042] Among them, when the engine speed is determined, the maximum fan speed (duty cycle 100%) = fan input speed * fan engagement ratio.

[0043] In addition, in some optional embodiments of the present invention, the method further includes: The difference between the target speed and the actual speed of the fan is obtained, and the control quantity calculated by the PID control algorithm is combined with the current actual speed to obtain the final duty cycle, which is used to adjust the fan speed so that it follows the target speed.

[0044] Among them, in the embodiment of the present invention, an engine target speed following function is integrated, and the input of this function is error = target speed - actual speed. The target speed is finally determined by the fan speed protection function, and the actual speed is determined by the application layer receiving and processing the pulse frequency signal provided by the fan speed sensor. In the discrete case, U(k)=Kp*e(k)+Ki∑e(n)+Kd(e(k)-e(k-1)), Kp, Ki, Kd are calibration quantities, and the output duty cycle=added speed ÷ maximum fan speed*100%. The output of this function is the duty cycle corresponding to the speed obtained by actual speed+U(k), and this duty cycle is the final output of the VCU.

[0045] In summary, the silicone oil clutch fan control method in the above embodiment of the present invention obtains the engine intake temperature signal, the fan actual speed signal, the engine cooling water temperature signal, the engine torque signal and the engine speed signal; determines the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; determines the fan duty ratio required for water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determines the fan duty ratio required for air temperature cooling according to the intake temperature signal; determines the target fan duty ratio according to the fan duty ratio required for water temperature cooling and the fan duty ratio required for temperature cooling, and determines the target speed according to the target fan duty ratio, and controls the fan to adjust from the fan actual speed to the target speed. Under the premise of ensuring a balance between energy consumption and cooling function, it is ensured that the fan speed, i.e., the engine speed, is accurately controlled. It solves the problems of the electric control silicone oil clutch fan in the prior art that the engine heat is easily accumulated and the cooling is not timely due to the imperfect control strategy, resulting in high fuel consumption and engine failure.

[0046] Embodiment 3 See also Figure 3 , shown is a silicone oil clutch fan control device proposed in the third embodiment of the present invention, the device comprises: An acquisition module 100 is used to acquire an engine intake air temperature signal, a fan actual speed signal, an engine cooling water temperature signal, an engine torque signal, and an engine speed signal; A determination module 200, for determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; A calculation module 300, for determining a fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining a fan duty ratio required for air temperature cooling according to the intake air temperature signal; The control module 400 is used to determine the target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling, determine the target speed according to the target fan duty cycle, and control the fan to adjust from the actual fan speed to the target speed.

[0047] Furthermore, in the above-mentioned silicone oil clutch fan control device, the steps of respectively determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal include: Obtaining an air intake temperature voltage signal Umeasured collected by an air intake temperature sensor arranged at the air intake of the engine; Obtaining the internal voltage of the intake air temperature sensor and the pull-up resistor R solid, determining the corresponding temperature resistance through a voltage division formula according to the voltage signal U test, the internal voltage of the intake air temperature sensor and the pull-up resistor R solid, and finding the engine intake air temperature corresponding to the temperature resistance in a preset resistance-temperature MAP; Among them, the expression of the voltage division formula is: Rhot = Rsolid*Utest / (Uinternal-Utest); Among them, Rhot is the temperature resistor, Rsolid is the pull-up resistor, Umeasure is the voltage signal, and Uinside is the internal voltage of the intake air temperature sensor.

[0048] Furthermore, in the above-mentioned silicone oil clutch fan control device, the step of determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal respectively further includes: A continuous speed pulse signal collected by a fan speed sensor arranged on the fan is obtained, and the actual speed of the fan is determined according to the corresponding relationship between the speed pulse signal and the fan speed.

[0049] Furthermore, in the above-mentioned silicone oil clutch fan control device, the step of determining the fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining the fan duty ratio required for air temperature cooling according to the intake air temperature signal comprises: Searching and determining the target water temperature in the engine low fuel consumption water temperature target MAP according to the engine torque signal and the engine speed signal; Receive the engine water temperature signal, set it as the actual water temperature, and determine the fan duty cycle required for cooling the outlet water temperature based on the difference between the target water temperature and the actual water temperature in the fan control MAP; Receive the intake air temperature signal and set it as the actual intercooler temperature. According to the intercooler temperature-fan duty cycle table, determine the fan duty cycle required for air temperature cooling.

[0050] Furthermore, in the above-mentioned silicone oil clutch fan control device, the step of determining the target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling comprises: The maximum value of the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling is used as the target fan duty cycle.

[0051] Furthermore, in the above-mentioned silicone oil clutch fan control device, the step of determining the target speed according to the target fan duty cycle and controlling the fan to adjust from the actual fan speed to the target speed includes: When the engine speed is less than the first threshold, the target speed is the maximum fan speed at the current engine speed*the engine cooling function output duty cycle; When the engine speed is greater than the first threshold, the target speed is the maximum speed of the fan at the current engine speed; The maximum fan speed is the fan input speed*the fan mesh ratio, and the fan mesh ratio is obtained by searching the corresponding engine speed in the engine speed-mesh ratio MAP.

[0052] Furthermore, the above-mentioned silicone oil clutch fan control device, wherein the device also includes: The difference between the target speed and the actual speed of the fan is obtained, and the control quantity calculated by the PID control algorithm is combined with the current actual speed to obtain the final duty cycle, which is used to adjust the fan speed so that it follows the target speed.

[0053] The functions or operation steps implemented when the above modules are executed are substantially the same as those in the above method embodiments, and will not be repeated here.

[0054] Embodiment 4 Another aspect of the present invention further provides a readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the steps of the method described in any one of the above-mentioned embodiments 1 to 2 are implemented.

[0055] Embodiment 5 Another aspect of the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in any one of the above-mentioned embodiments one to two when executing the program.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be specifically implemented in any computer-readable storage medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable storage medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0058] More specific examples (a non-exhaustive list) of computer-readable storage media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable storage medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0059] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0061] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for controlling a silicone oil clutch fan, characterized in that: The method comprises: Obtaining engine intake air temperature signal, fan actual speed signal, engine cooling water temperature signal, engine torque signal and engine speed signal; Determine the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; Determine the fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determine the fan duty ratio required for air temperature cooling according to the intake air temperature signal; The target fan duty cycle is determined according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling, and the target speed is determined according to the target fan duty cycle, and the fan is controlled to adjust from the actual fan speed to the target speed.

2. The method for controlling a silicone oil clutch fan according to claim 1, characterized in that: The step of determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal comprises: Obtaining an air intake temperature voltage signal Umeasured collected by an air intake temperature sensor arranged at the air intake of the engine; Obtaining the internal voltage of the intake air temperature sensor and the pull-up resistor R solid, determining the corresponding temperature resistance through a voltage division formula according to the voltage signal U test, the internal voltage of the intake air temperature sensor and the pull-up resistor R solid, and finding the engine intake air temperature corresponding to the temperature resistance in a preset resistance-temperature MAP; Among them, the expression of the voltage division formula is: Rhot = Rsolid*Utest / (Uinternal-Utest); Among them, Rhot is the temperature resistor, Rsolid is the pull-up resistor, Umeasure is the voltage signal, and Uinside is the internal voltage of the intake air temperature sensor.

3. The silicone oil clutch fan control method according to claim 2, characterized in that: The step of determining the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal respectively further comprises: A continuous speed pulse signal collected by a fan speed sensor arranged on the fan is obtained, and the actual speed of the fan is determined according to the corresponding relationship between the speed pulse signal and the fan speed.

4. The silicone oil clutch fan control method according to claim 1, characterized in that: The step of determining the fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining the fan duty ratio required for air temperature cooling according to the intake air temperature signal comprises: Searching and determining the target water temperature in the engine low fuel consumption water temperature target MAP according to the engine torque signal and the engine speed signal; Receive the engine water temperature signal, set it as the actual water temperature, and determine the fan duty cycle required for cooling the outlet water temperature based on the difference between the target water temperature and the actual water temperature in the fan control MAP; Receive the intake air temperature signal and set it as the actual intercooler temperature. According to the intercooler temperature-fan duty cycle table, determine the fan duty cycle required for air temperature cooling.

5. The silicone oil clutch fan control method according to claim 1, characterized in that: The step of determining the target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling comprises: The maximum value of the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling is used as the target fan duty cycle.

6. The method for controlling a silicone oil clutch fan according to claim 1, characterized in that: The step of determining a target speed according to the target fan duty cycle and controlling the fan to adjust from the actual fan speed to the target speed comprises: When the engine speed is less than the first threshold, the target speed is the maximum fan speed at the current engine speed*the engine cooling function output duty cycle; When the engine speed is greater than the first threshold, the target speed is the maximum speed of the fan at the current engine speed; The maximum fan speed is the fan input speed*the fan mesh ratio, and the fan mesh ratio is obtained by searching the corresponding engine speed in the engine speed-mesh ratio MAP.

7. The method for controlling a silicone oil clutch fan according to claim 1, characterized in that: The method further comprises: The difference between the target speed and the actual speed of the fan is obtained, and the control quantity calculated by the PID control algorithm is combined with the current actual speed to obtain the final duty cycle, which is used to adjust the fan speed to follow the target speed.

8. A silicone oil clutch fan control device, characterized in that: The device comprises: An acquisition module, used to acquire an engine intake air temperature signal, a fan actual speed signal, an engine cooling water temperature signal, an engine torque signal, and an engine speed signal; A determination module, used to determine the engine intake temperature and the fan actual speed according to the engine intake temperature signal and the fan actual speed signal; a calculation module, for determining a fan duty ratio required for outlet water temperature cooling according to the engine torque signal, the engine speed signal and the cooling water temperature signal, and determining a fan duty ratio required for air temperature cooling according to the intake air temperature signal; The control module is used to determine a target fan duty cycle according to the fan duty cycle required for water temperature cooling and the fan duty cycle required for temperature cooling, determine a target speed according to the target fan duty cycle, and control the fan to adjust from the actual fan speed to the target speed.

9. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 7 when executing the program.

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