An intelligent cooling system for internal combustion forklift

Abstract

The present invention discloses an intelligent cooling system for an internal combustion forklift, including a controller, an engine controller, a gearbox controller, a temperature sensor and a proportional solenoid valve. The engine controller and the gearbox controller exchange data with the controller through a bus, the temperature sensor and the proportional solenoid valve are directly connected to the controller through a wire, and the proportional solenoid valve is used to control the fan speed according to the controller instruction. The intelligent cooling system for an internal combustion forklift disclosed in the present application collects the temperature of different parts of the engine in real time through the controller. If the real-time temperature exceeds the preset alarm temperature, the cooling fan is directly turned on to the maximum speed to meet the system heat dissipation demand. If the real-time temperature does not exceed the preset alarm temperature, an algorithm comparison is performed to determine the maximum cooling instruction, and the cooling instruction is converted into a pulse signal to control the proportional solenoid valve to control the cooling fan to change the speed more smoothly, thereby reducing the noise of the cooling system.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle intelligent control, and in particular to an intelligent cooling system for an internal combustion forklift. Background Art

[0002] With the increasing requirements for energy conservation and emission reduction in construction machinery and road transport vehicles, the engine thermal management system faces new challenges. Higher heat dissipation requirements and more accurate temperature control require the vehicle's heat dissipation control system to be able to efficiently adjust the heat dissipation intensity in real time. The fan drive system is an indispensable part of the heat dissipation control system, and the use of a more intelligent and efficient fan drive solution is also an indispensable part of future vehicles.

[0003] At present, the traditional solution adopted by internal combustion forklifts is to directly couple the driving fan to the engine through a pulley, resulting in the fan speed being completely dependent on the engine speed and being unable to make real-time adjustments based on changes in the engine's operating conditions. When the engine is working at low speed and high load, the cooling is insufficient; when the engine is working at high speed and low load, the cooling is excessive, resulting in energy waste; there is no high-temperature alarm prompt and fault diagnosis analysis, resulting in the inability to find the real cause of the fault after a high-temperature shutdown.

[0004] Therefore, how to provide a cooling system that can adjust the cooling performance in real time according to the status of the entire engine is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide an intelligent cooling system for an internal combustion forklift. During the entire working process of the vehicle, the intelligent fan cooling system adjusts the fan speed according to the real-time temperature changes to reduce power and fuel consumption.

[0006] In order to solve the above technical problems, the present invention provides an intelligent cooling system for an internal combustion forklift, including a controller, an engine controller, a transmission controller, a temperature sensor and a proportional solenoid valve. The engine controller and the transmission controller exchange data with the controller through a bus, the temperature sensor and the proportional solenoid valve are directly connected to the controller through wires, and the proportional solenoid valve is used to control the fan speed according to the controller instructions.

[0007] Preferably, the controller collects engine water temperature signal, intake air temperature signal, transmission oil temperature signal and hydraulic oil tank temperature signal respectively.

[0008] Preferably, the controller is based on (T∈[T1, T2]) respectively calculates the numerical values ​​C1, C2, C3 and C4 corresponding to the engine water temperature signal, the intake air temperature signal, the transmission oil temperature signal and the hydraulic oil tank temperature signal, compares C1, C2, C3 and C4 and selects the maximum value as the final cooling instruction; wherein T is the real-time temperature value, ξ is the expansion coefficient, and [T1, T2] is the working temperature range.

[0009] Preferably, the controller controls the opening of the proportional solenoid valve according to the final cooling instruction, and the proportional solenoid valve drives the variable motor to control the fan speed.

[0010] Preferably, the device further comprises a display connected to the controller.

[0011] Preferably, the display has a built-in alarm prompt component.

[0012] The internal combustion forklift intelligent cooling system provided by the present invention includes a controller, an engine controller, a gearbox controller, a temperature sensor and a proportional solenoid valve. The engine controller and the gearbox controller exchange data with the controller through a bus, the temperature sensor and the proportional solenoid valve are directly connected to the controller through a wire, and the proportional solenoid valve is used to control the fan speed according to the controller instruction. The internal combustion forklift intelligent cooling system disclosed in the present application collects the temperature of different parts of the engine in real time through the controller. If the real-time temperature exceeds the preset alarm temperature, the cooling fan is directly turned on to the maximum speed to meet the system heat dissipation demand. If the real-time temperature does not exceed the preset alarm temperature, an algorithm comparison is performed to determine the maximum cooling instruction, and the cooling instruction is converted into a pulse signal to control the proportional solenoid valve to change the speed of the cooling fan more smoothly, thereby reducing the noise of the cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the overall electrical structure of a specific implementation method provided by the present invention.

[0015] in, Figure 1 middle:

[0016] Controller—1, engine controller—2, transmission controller—3, temperature sensor—4, proportional solenoid valve—5, display—6. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the overall electrical structure of a specific implementation method provided by the present invention.

[0019] In a specific implementation manner provided by the present invention, a controller 1, an engine controller 2, a transmission controller 3, a temperature sensor 4 and a proportional solenoid valve 5 are mainly provided. The engine controller 2 and the transmission controller 3 exchange data with the controller 1 through a bus. The temperature sensor 4 and the proportional solenoid valve 5 are directly connected to the controller 1 through wires. The proportional solenoid valve 5 is used to control the fan speed according to the instructions of the controller 1.

[0020] Among them, the controller 1, the engine controller 2, and the transmission controller 3 are all directly connected to the battery of the internal combustion forklift through a fuse. The battery is directly used to power the controller 1, the engine controller 2, and the transmission controller 3. The controller 1, the engine controller 2, and the transmission controller 3 exchange data through a transmission bus. The temperature sensor 4 and the proportional solenoid valve 5 are directly connected to the controller 1 through wires for data transmission; the controller 1 processes the data collected by the engine controller 2, the transmission controller 3, and the temperature sensor 4, and controls the drive motor by controlling the opening of the proportional solenoid valve 5, thereby controlling the speed of the cooling fan to form a cooling effect.

[0021] Specifically, in the actual application process, the controller 1, the engine controller 2, and the transmission controller 3 are first connected to the battery of the internal combustion forklift through wires, and a fuse is installed before connecting to the battery to ensure the safety of the line. Then, the temperature sensor 4 and the proportional solenoid valve 5 are directly connected to the controller 1 through wires. At the same time, the controller 1, the engine controller 2, and the transmission controller 3 are connected through a transmission bus, and the transmission is used for data transmission between the controller 1, the engine controller 2, and the transmission controller 3; when the engine starts working, the engine controller 2 collects the engine water temperature and the intake air temperature, and the transmission controller 3 collects the transmission oil temperature. The controller 1 collects the engine water temperature, the intake air temperature and the transmission oil temperature signals from the transmission bus in real time, as well as the hydraulic oil tank temperature signal collected by the temperature sensor 4 directly connected by the wire. Then, according to the working temperature range of the above four temperatures, the cooling instruction is determined, and finally the cooling instruction is converted into a pulse signal to control the proportional solenoid valve 5 to open, and then control the drive variable motor to control the working power of the cooling fan to complete the cooling operation.

[0022] In order to optimize the advantage of the internal combustion forklift intelligent cooling system in the above embodiment that the heat dissipation effect can be more targeted, the controller 1 collects the engine water temperature signal, the intake air temperature signal, the gearbox oil temperature signal and the hydraulic oil tank temperature signal respectively; then, the controller 1 collects the engine water temperature signal, the intake air temperature signal, the gearbox oil temperature signal and the hydraulic oil tank temperature signal respectively; (T∈[T1,T2]) respectively calculate the values ​​C1, C2, C3 and C4 corresponding to the engine water temperature signal, intake air temperature signal, transmission oil temperature signal and hydraulic oil tank temperature signal, compare C1, C2, C3 and C4 and select the maximum value as the final cooling instruction; where T is the real-time temperature value, ξ is the expansion coefficient, and [T1,T2] is the working temperature range. First of all, it is explained that the controller 1 collects 4 temperature signals because it collects 4 temperature signals at the same time for analysis and processing, which can maximize the heat dissipation of each part, as follows:

[0023] Due to the existence of different engine working conditions, the temperature of each part of the engine is uncertain. The controller 1 simultaneously collects the engine water temperature signal, the intake temperature signal, the transmission oil temperature signal and the hydraulic oil tank temperature signal, and calculates the temperature of each part through the working temperature range [T1, T2] and the real-time temperature T through the formula (T∈[T1,T2]) is calculated, ξ is the expansion coefficient, and cooling instructions for different parts are calculated respectively. If the real-time temperature exceeds the alarm temperature, the cooling fan is directly turned on to the maximum mode, and an alarm is displayed on the display 6 to remind the driver;

[0024] Furthermore, in actual applications, we cannot optimally meet the cooling requirements of the four temperatures at the same time. Therefore, when the engine is in normal working mode, we compare the values ​​of C1, C2, C3 and C4, take the maximum value as the final cooling instruction, and then use the control algorithm to calculate the cooling command. (T∈[T1,T2]) is calculated, the cooling instruction is converted into a pulse signal output, the opening of the proportional solenoid valve 5 is controlled, and the variable motor is driven to control the speed of the cooling fan. A smooth optimization function is added to the algorithm so that the fan speed can be increased and decreased gently and smoothly, reducing the noise of the cooling fan.

[0025] Based on the above scheme, the variable motor is controlled by the proportional solenoid valve 5. The controller 1 controls the opening of the proportional solenoid valve 5 according to the final cooling instruction, and the proportional solenoid valve 5 drives the variable motor to control the speed of the cooling fan. The proportional solenoid valve 5 replaces the traditional control part in different forms, and controls the pressure, flow or direction of the oil flow continuously and proportionally according to the input electrical signal. The proportional solenoid valve 5 generally has pressure compensation performance, and the output pressure and flow can be unaffected by load changes, which can achieve a smoother speed change of the cooling fan, so as to achieve less noise when the cooling fan changes its speed. The specific implementation process is:

[0026] Controller 1 first collects engine water temperature, intake air temperature, transmission oil temperature and hydraulic oil tank temperature signals, and then uses the control algorithm to (T∈[T1,T2]), respectively calculate the cooling instructions of the above four temperatures. At this time, the controller 1 determines whether the four cooling instructions exceed the preset alarm temperature. If the preset alarm temperature is exceeded, the cooling fan is directly turned on to the maximum mode, and an alarm is issued on the display 6 to remind the driver. If the preset alarm temperature is not exceeded, the four cooling instructions are compared, and the maximum value of the cooling instruction is taken, and the maximum value is converted into a pulse signal through the control algorithm. The proportional solenoid valve 5 is controlled by the pulse signal to open, so that the cooling fan can change its speed more smoothly, so that the noise is smaller when the cooling fan changes its speed. It should be noted that when the whole machine suddenly shuts down after working for a certain period of time under normal working conditions, and then restarts at the moment, because the oil temperature of the system may be at a high level at this time, but the control program still defaults to the cooling instruction as 0, resulting in insufficient flow to start the variable motor of the cooling fan smoothly. At the moment when the engine is fully started, the algorithm controls the cooling instruction to 60% of the total instruction and maintains it for 1 second, giving the system a short impact pressure to help the variable motor start, and then restores the normal working state to ensure the soft start of the cooling system and the stability of the cooling system.

[0027] Furthermore, the intelligent cooling system for internal combustion forklifts also includes a display 6 connected to the controller 1; the display 6 has a built-in alarm prompt component. The function of the display 6 has been mentioned in the above scheme. When any real-time temperature collected by the controller 1 exceeds the preset alarm temperature, the maximum speed of the cooling fan will be directly turned on to meet the heat dissipation requirements of the system. At the same time, the alarm prompt component of the display 6 is used to prompt the driver to perform operations more standardizedly and ensure the safety of the driving process.

[0028] In summary, the internal combustion forklift intelligent cooling system provided in this embodiment mainly includes a controller, an engine controller, a gearbox controller, a temperature sensor and a proportional solenoid valve. The engine controller and the gearbox controller exchange data with the controller through a bus, the temperature sensor and the proportional solenoid valve are directly connected to the controller through a wire, and the proportional solenoid valve is used to control the fan speed according to the controller instruction. The internal combustion forklift intelligent cooling system disclosed in this application collects the temperature of different parts of the engine in real time through the controller. If the real-time temperature exceeds the preset alarm temperature, the cooling fan is directly turned on to the maximum speed to meet the system heat dissipation requirements. If the real-time temperature does not exceed the preset alarm temperature, an algorithm comparison is performed to determine the maximum cooling instruction, and the cooling instruction is converted into a pulse signal to control the proportional solenoid valve to change the speed of the cooling fan more smoothly, thereby reducing the noise of the cooling system.

[0029] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An intelligent cooling system for an internal combustion forklift, characterized in that: The invention comprises a controller (1), an engine controller (2), a gearbox controller (3), a temperature sensor (4) and a proportional solenoid valve (5), wherein the engine controller (2) and the gearbox controller (3) perform data exchange with the controller (1) via a bus, the temperature sensor (4) and the proportional solenoid valve (5) are directly connected to the controller (1) via a wire, and the proportional solenoid valve (5) is used to control the fan speed according to the instruction of the controller (1); The controller (1) collects engine water temperature signals, intake air temperature signals, gearbox oil temperature signals and hydraulic oil tank temperature signals respectively; The controller (1) is based on The numerical values ​​C1, C2, C3 and C4 corresponding to the engine water temperature signal, the intake air temperature signal, the transmission oil temperature signal and the hydraulic oil tank temperature signal are calculated respectively. At this time, the controller (1) determines whether the four cooling instructions exceed the preset alarm temperature. If the preset alarm temperature is exceeded, the cooling fan is directly turned on to the maximum mode, and an alarm is issued on the display (6) to remind the driver. If the preset alarm temperature is not exceeded, C1, C2, C3 and C4 are compared and the maximum value is selected as the final cooling instruction; wherein T is the real-time temperature value, ξ is the expansion coefficient, and [T1, T2] is the working temperature range; The controller (1) controls the opening of the proportional solenoid valve (5) according to the final cooling instruction, and the proportional solenoid valve (5) drives the variable motor to control the fan speed; When the whole machine suddenly shuts down after working for a certain period of time under normal working conditions and then restarts, the system oil temperature may be at a high level at this time, but the control program still defaults to the cooling instruction of 0, resulting in insufficient flow to smoothly start the variable motor of the cooling fan. At the moment the engine is fully started, the algorithm control sets the cooling instruction to 60% of the total instruction and maintains it for 1 second, giving the system a brief impact pressure to help the variable motor start, and then returns to normal working conditions to ensure the soft start of the cooling system.

2. The intelligent cooling system for internal combustion forklift according to claim 1, characterized in that: It also includes a display (6) connected to the controller (1).

3. The intelligent cooling system for internal combustion forklift according to claim 2, characterized in that: The display (6) has an internal alarm prompt component.

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