CN209980038U - Single-pin double-signal cooling fan control device - Google Patents
Single-pin double-signal cooling fan control device Download PDFInfo
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- CN209980038U CN209980038U CN201821138015.4U CN201821138015U CN209980038U CN 209980038 U CN209980038 U CN 209980038U CN 201821138015 U CN201821138015 U CN 201821138015U CN 209980038 U CN209980038 U CN 209980038U
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Abstract
The utility model relates to the field of automobile cooling fans, in particular to a single-pin double-signal cooling fan control device, which connects the input end of a pulse width signal control unit and the output end of a fault feedback signal control unit on the same wiring pin A by designing the pulse width signal control unit and the fault feedback signal control unit, and uses the wiring pin of a connector, thereby reducing the number of the wiring pins, reducing the manufacturing cost and realizing the control and transmission of two different signals by a single pin; and the problem that the operation fault of the cooling fan cannot be fed back to the engine by the controller with various input signals is solved, the applicability of the controller can be increased, and the manufacturing cost of the controller when the same function is realized is reduced.
Description
Technical Field
The utility model relates to an automobile cooling fan field particularly, relates to a single pin dual signal cooling fan controlling means.
Background
The engine cooling fan is mainly used for cooling in an automobile engine compartment, and the fan directly blows air to the water-cooling condensing sheet to take heat on the condensing sheet out of the engine compartment, so that the overall heat dissipation efficiency of the engine compartment is improved, a series of mechanical faults and possible dangerous hazards caused by overheating of an engine are prevented, and the driving safety is ensured. The traditional engine cooling fan is 4-5 gear resistance type speed change, the speed-adjustable range is limited greatly, a monitoring/protecting/information feedback function is not provided, and the current state information of the fan cannot be effectively and timely provided for a driver in an abnormal working state, so that the hidden danger of driving safety can be brought. And due to the limitation of the gear shifting range, intelligent and accurate adjustment of the wind speed cannot be realized. The Pulse Width Modulation (PWM) control mode has accurate wind speed regulation capability. It is a method of digitally encoding the level of an analog signal, with the use of a high resolution counter, the duty cycle of a square wave being modulated to encode the level of a particular analog signal. Any analog value can be encoded using PWM as long as the bandwidth is wide enough. The advantage is that the signals from the processor to the controlled system are in digital form and do not need to be converted from digital to analogue. Keeping the signal in digital form minimizes the noise effects; meanwhile, the analog circuit is controlled in a digital mode, so that the cost and the power consumption of the system can be greatly reduced. In addition, many Microcontrollers (MCU) and Digital Signal Processors (DSP) already contain PWM controllers on the chip, which makes the implementation of Digital control easier.
The engine cooling fan controller needs to control various signals, including pulse width input control signal, voltage input control signal, Lin input control signal and multiple output feedback signal, and most of signal ports in the prior art only use pulse width input control signal, also use multiple input control signal, but this kind of controller can't feed back to the engine controller when detecting equipment trouble, can lead to the engine to work under abnormal operating mode, causes the injury to the engine. However, the use of fault feedback signals requires an increased pin count for the connector, increases the cost of manufacturing the connector, and reduces the applicability of the controller.
It is common in the art for a single connector (single port) of an engine cooling fan controller to control one input or output signal, if multiple signals are to be controlled, it is common practice to increase the number of connectors and the number of signal ports, which results in a higher manufacturing cost for the controller, and in some applications, because of the limited space, the number of connectors and the number of pins are limited, in order to meet the functional requirements, various signals must be controlled on a single port, the most critical technical means is to design a proper combination and connection relationship of electronic components to realize the control of various signals on a single port, the more the types of the signals to be controlled on the single port are and the greater the difference between the signals is, the greater the technical difficulty in designing appropriate electronic component combinations and connections, the less likely it is to be desirable to implement.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a single pin dual signal cooling fan controlling means to solve above-mentioned problem.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
the utility model provides a single pin dual signal cooling fan controlling means, include
The pulse width signal control unit comprises a pulse width signal control unit input end and a pulse width signal control unit output end; and
the fault feedback signal control unit comprises a fault feedback signal control unit input end and a fault feedback signal control unit output end;
the input end of the pulse width signal control unit and the output end of the fault feedback signal control unit are connected to the same wiring pin A,
the input of the wiring pin A is a PWM pulse width signal, when the input of the PWM pulse width signal is at a high level, the output end of the pulse width signal control unit is at a low level, and when the input of the PWM pulse width signal is at a low level, the output end of the pulse width signal control unit is at a high level;
the input end of the fault feedback signal control unit receives signals with certain frequency and pulse width and outputs the signals through a wiring pin A.
In the preferred embodiment of the present invention, the power supply further comprises a microprocessor, wherein the output end of the pulse width signal control unit and the input end of the fault feedback signal control unit are electrically connected to corresponding pins of the microprocessor respectively.
In a preferred embodiment of the present invention, the microprocessor includes a timer capture unit and a micro control unit, and the output end of the pulse width signal control unit is connected to the timer capture unit and is adapted to capture the pulse width signal;
the captured pulse width signals are analyzed and processed through the micro control unit, when a fault is detected, the micro control unit sends signals with a certain frequency and pulse width to the input end of the fault feedback signal control unit, and the signals are connected with the ECU through the output of the wiring pin A.
In the preferred embodiment of the present invention, the pulse width signal control unit includes a resistor R37, a resistor R38, a resistor R39, a resistor R40, a capacitor C39, and a transistor Q4;
the collecting electrode of triode Q4 passes through resistance R37 and is connected with pulse width signal control unit output, triode Q4's collecting electrode passes through resistance R38 and is connected with +12V power, triode Q4's base connects gradually resistance R40's one end, electric capacity C39's one end and resistance R39's one end, and resistance R40 and electric capacity C39's the other end are connected with ground, resistance R39's the other end and wiring pin A are connected.
In a preferred embodiment of the present invention, the fault feedback signal control unit includes a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a resistor R31, a resistor R32, a resistor R34, a resistor R35, a resistor R36, and a transistor Q3,
the input end of the fault feedback signal control unit is connected with one end of a resistor R35, the other end of the resistor R35 is connected with the base electrode of a triode Q3, one end of a capacitor C36 is connected with the input end of the fault feedback signal control unit, the other end of the capacitor C36 is connected with the ground, one end of a resistor R36 is connected with the base electrode of a triode Q3, and the other end of the resistor R36 is connected with the ground;
a collector of the triode Q3 is connected with a +12V power supply through a resistor R31 and a resistor R34 which are connected in parallel, a collector of the triode Q3 is connected with one end of a resistor R32, the other end of the resistor R32 is connected with a connection pin a, one end of a capacitor C34 is connected in series with one end of a capacitor C37, the other end of the capacitor C34 is connected with a collector of a triode Q3, the other end of the capacitor C37 is connected with ground, one end of the capacitor C35 is connected in series with one end of the capacitor C38, the other end of the capacitor C35 is connected with the connection pin a, and the other end of the capacitor C38 is connected with ground;
the emitter of the transistor Q3 is grounded.
In a preferred embodiment of the present invention, the brushless motor further comprises a power driving unit, and the microprocessor controls the brushless motor through the power driving unit.
In a preferred embodiment of the present invention, the microprocessor, the pulse width signal control unit, the fault feedback signal control unit and the power driving unit are integrated into a module.
A control method of a single-pin dual-signal cooling fan control device comprises
The pulse width signal control unit comprises a pulse width signal control unit input end and a pulse width signal control unit output end;
the fault feedback signal control unit comprises a fault feedback signal control unit input end and a fault feedback signal control unit output end; and a microprocessor for controlling the operation of the microprocessor,
the input end of the pulse width signal control unit and the output end of the fault feedback signal control unit are connected to the same wiring pin A,
the input of the wiring pin A is a PWM pulse width signal, when the input of the PWM pulse width signal is at a high level, the output end of the pulse width signal control unit is at a low level, and when the input of the PWM pulse width signal is at a low level, the output end of the pulse width signal control unit is at a high level; the micro control unit analyzes and processes the real-time captured pulse width signal, and when a fault is detected, the micro control unit sends a signal with a certain frequency and pulse width to the input end of the fault feedback signal control unit and outputs the signal through a wiring pin A.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:
the embodiment of the utility model provides a single pin dual signal cooling fan controlling means, through designing pulse width signal control unit and trouble feedback signal control unit, connect pulse width signal control unit input and trouble feedback signal control unit output on same wiring pin A, use the wiring pin of a connector, reduced the quantity of wiring pin, reduced manufacturing cost, realize that single pin control transmits two kinds of different signals; and the problem that the operation fault of the cooling fan cannot be fed back to the engine by the controller with various input signals is solved, the applicability of the controller can be increased, and the manufacturing cost of the controller when the same function is realized is reduced.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a system diagram of a single-pin dual-signal cooling fan control apparatus provided by the present invention;
FIG. 2 is a circuit diagram of a pulse width signal control unit and a fault feedback signal control unit;
fig. 3 is a schematic diagram of a single-pin dual-signal cooling fan control apparatus provided by the present invention;
FIG. 4 is a schematic diagram of the connection between the microprocessor and the signal input/output terminal.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
In the description of the present invention, it is to be understood that the terms "connected" and "connected" are used in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present invention includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Examples
Referring to fig. 1, 2 and 4, an embodiment of the present invention provides a single-pin dual-signal cooling fan control device, including a microprocessor, a pulse width signal control unit 1 and a fault feedback signal control unit 2, where the pulse width signal control unit 1 includes a pulse width signal control unit input end 11 and a pulse width signal control unit output end 12; the fault feedback signal control unit 2 comprises a fault feedback signal control unit input 21 and a fault feedback signal control unit output 22; as shown in fig. 2 and 4, the output terminal 12 of the pulse width signal control unit and the input terminal 21 of the FAULT feedback signal control unit are electrically connected to corresponding pins of the microprocessor, respectively, the output terminal 12 of the pulse width signal control unit is connected to a pin LIN0 (pin 1) of the microprocessor, one end of a capacitor C70 is connected to the pin LIN0 (pin 1) of the microprocessor, the size of the capacitor C70 is 220pF, the other end of the capacitor C70 is grounded, the input terminal 21 of the FAULT feedback signal control unit is connected to the pin PP0/EVDD1/KWP0/PWM0_0/ECLK/FAULT5 (pin 61), the input terminal 11 of the pulse width signal control unit and the output terminal 22 of the FAULT feedback signal control unit are connected to the same connection pin A3, the connection pin A3 is inputted with a PWM pulse width signal, when the PWM pulse width signal is inputted at a high level, the output terminal 12 of the pulse width signal control unit is, the output end 12 of the pulse width signal control unit is at a high level; the fault feedback signal control unit input 21 receives a signal of a certain frequency and pulse width and outputs it via a connection pin a 3.
In a specific embodiment, the microprocessor comprises a timer capture unit and a micro control unit, the output 12 of the pulse width signal control unit is connected with the timer capture unit and is suitable for capturing the pulse width signal; the captured pulse width signal is analyzed and processed by the micro control unit, and when a fault is detected, the micro control unit sends a signal with a certain frequency and a certain pulse width to the input end 21 of the fault feedback signal control unit and outputs the signal through a wiring pin A3. Is connected with an ECU
Referring to fig. 2, the pulse width signal control unit includes a resistor R37, a resistor R38, a resistor R39, a resistor R40, a capacitor C39, and a transistor Q4; a collector of the triode Q4 is connected with the output end 12 of the pulse width signal control unit through a resistor R37, a collector of the triode Q4 is connected with a +12V power supply through a resistor R38, a base of the triode Q4 is sequentially connected with one end of a resistor R40, one end of a capacitor C39 and one end of a resistor R39, the other ends of the resistor R40 and the capacitor C39 are connected with the ground, and the other end of the resistor R39 is connected with a wiring pin A3; the fault feedback signal control unit comprises a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a resistor R31, a resistor R32, a resistor R34, a resistor R35, a resistor R36 and a triode Q3, wherein an input end 21 of the fault feedback signal control unit is connected with one end of the resistor R35, the other end of the resistor R35 is connected with a base electrode of the triode Q3, one end of the capacitor C36 is connected with the input end 21 of the fault feedback signal control unit, the other end of the capacitor C36 is connected with the ground, one end of the resistor R36 is connected with the base electrode of the triode Q3, and the other end of the resistor R36; a collector of the triode Q3 is connected with a +12V power supply through a resistor R31 and a resistor R34 which are connected in parallel, a collector of the triode Q3 is connected with one end of a resistor R32, the other end of the resistor R32 is connected with a wiring pin A3, one end of a capacitor C34 is connected with one end of a capacitor C37 in series, the other end of a capacitor C34 is connected with a collector of the triode Q3, the other end of a capacitor C37 is connected with the ground, one end of the capacitor C35 is connected with one end of a capacitor C38 in series, the other end of the capacitor C35 is connected with a wiring pin A3, and the other end of the capacitor C38 is;
the emitter of transistor Q3 is connected to ground.
Preferably, the brushless motor further comprises a power driving unit, and the microprocessor controls the brushless motor through the power driving unit.
Preferably, the microprocessor, the pulse width signal control unit, the fault feedback signal control unit and the power driving unit are integrated in one module.
A control method of a single-pin dual-signal cooling fan control device comprises
The pulse width signal control unit comprises a pulse width signal control unit input end 11 and a pulse width signal control unit output end 12;
a fault feedback signal control unit comprising a fault feedback signal control unit input 21 and a fault feedback signal control unit output 22; and a microprocessor for controlling the operation of the microprocessor,
the pulse width signal control unit input 11 and the fault feedback signal control unit output 22 are connected to the same connection pin a3,
the input of the wiring pin A3 is a PWM pulse width signal, when the input of the PWM pulse width signal is at a high level, the output end 12 of the pulse width signal control unit is at a low level, and when the input of the PWM pulse width signal is at a low level, the output end 12 of the pulse width signal control unit is at a high level; the micro control unit analyzes and processes the real-time captured pulse width signal, and when a fault is detected, the micro control unit sends a signal with a certain frequency and pulse width to the input end 21 of the fault feedback signal control unit and outputs the signal through a wiring pin A3.
The microprocessor controls the cooling fan through the power driving unit, and the connection relationship between the microprocessor and the pulse width signal input terminal and the fault feedback control signal output terminal is shown in fig. 4.
The fault feedback signals which can be detected by the fault feedback signal unit comprise a power supply open-circuit fault, a power supply short-circuit fault, a power supply voltage overvoltage fault, a power supply voltage overlow fault, a cooling fan stalling fault, a cooling fan open-circuit fault, a cooling fan step-out fault and a cooling fan overcurrent fault, and the fault feedback signals are signals with the same frequency and different duty ratios.
The working principle is as follows:
referring to fig. 3, after power is turned on, a connection pin a3 waits for a pulse width signal to be input, a timer capture unit in a microprocessor collects a pulse width control signal and calculates the collected pulse width and frequency, the current required rotation speed of a brushless motor cooling fan of an engine is calculated according to the width of the collected pulse width signal, whether a fault occurs is detected every 1ms in the operation process of the cooling fan, if the fault occurs, the brushless motor cooling fan is stopped, then the brushless motor cooling fan is restarted every 3 seconds, whether the fault can be detected is judged, and if the fault can be detected after being continuously started for 5 times, a cooling fan controller outputs a fault feedback control signal with the same frequency and different duty ratios according to the detected fault.
As shown IN fig. 2 and 4, when the connection pin a3 is connected to the PWM pulse width signal, when the input PWM pulse width signal is at a high level, the high level is divided by the resistor R39 and the resistor R40 and then connected to the base of the transistor Q4, the collector voltage of the transistor Q4 IN the saturation state is at a low level, the signal is connected IN series with the resistor R37, the PWM _ IN signal connected to the input port of the microprocessor is also at a low level, when the input PWM pulse width signal is at a low level, the low level is divided by the resistor R39 and the resistor R40 and then connected to the base of the transistor Q4, the collector voltage of the transistor Q4 IN the cut-off state is at a high level, the signal is connected IN series with the resistor R37, and the PWM _ IN signal connected to the input port of the microprocessor is also at a. And the input end of the pulse width signal is connected to a timer capturing unit of the microprocessor after being converted by the pulse width control unit to capture the input pulse width signal. When the controller detects that a fault occurs, the fault feedback signal can output a signal with a certain frequency and a certain pulse width through an output port of the microprocessor, and the signal is output to the fault feedback interface through the fault feedback control unit. The fault signal outputs a pulse width signal with a certain frequency, the frequency of the fault feedback signal is different from the frequency of the input pulse width signal, the fault feedback signal is output to an engine controller ECU, after the filtering of hardware and software of the engine controller ECU, the engine ECU control unit can conveniently distinguish the fault feedback signal from the pulse width output signal, and the frequency and the pulse width of the fault feedback signal can be set through a PWM controller of a microprocessor.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. The utility model provides a single pin dual signal cooling fan controlling means which characterized in that: comprises that
The pulse width signal control unit comprises a pulse width signal control unit input end and a pulse width signal control unit output end; and
the fault feedback signal control unit comprises a fault feedback signal control unit input end and a fault feedback signal control unit output end;
the input end of the pulse width signal control unit and the output end of the fault feedback signal control unit are connected to the same wiring pin A,
the input of the wiring pin A is a PWM pulse width signal, when the input of the PWM pulse width signal is at a high level, the output end of the pulse width signal control unit is at a low level, and when the input of the PWM pulse width signal is at a low level, the output end of the pulse width signal control unit is at a high level;
the input end of the fault feedback signal control unit receives signals with certain frequency and pulse width and outputs the signals through a wiring pin A.
2. The single-pin dual-signal cooling fan control apparatus of claim 1,
the output end of the pulse width signal control unit and the input end of the fault feedback signal control unit are respectively and electrically connected with corresponding pins of the microprocessor.
3. The single-pin dual-signal cooling fan control apparatus of claim 2,
the microprocessor comprises a timer capturing unit and a micro control unit, wherein the output end of the pulse width signal control unit is connected with the timer capturing unit and is suitable for capturing pulse width signals;
the captured pulse width signals are analyzed and processed through the micro control unit, when a fault is detected, the micro control unit sends signals with certain frequency and pulse width to the input end of the fault feedback signal control unit, and the signals are output through the wiring pin A.
4. The single-pin dual-signal cooling fan control device of claim 3, wherein:
the pulse width signal control unit comprises a resistor R37, a resistor R38, a resistor R39, a resistor R40, a capacitor C39 and a triode Q4;
the collecting electrode of triode Q4 passes through resistance R37 and is connected with pulse width signal control unit output, triode Q4's collecting electrode passes through resistance R38 and is connected with +12V power, triode Q4's base connects gradually resistance R40's one end, electric capacity C39's one end and resistance R39's one end, and resistance R40 and electric capacity C39's the other end are connected with ground, resistance R39's the other end and wiring pin A are connected.
5. The single-pin dual-signal cooling fan control apparatus of claim 3,
the fault feedback signal control unit comprises a capacitor C34, a capacitor C35, a capacitor C36, a capacitor C37, a capacitor C38, a resistor R31, a resistor R32, a resistor R34, a resistor R35, a resistor R36 and a triode Q3,
the input end of the fault feedback signal control unit is connected with one end of a resistor R35, the other end of the resistor R35 is connected with the base electrode of a triode Q3, one end of a capacitor C36 is connected with the input end of the fault feedback signal control unit, the other end of the capacitor C36 is connected with the ground, one end of a resistor R36 is connected with the base electrode of a triode Q3, and the other end of the resistor R36 is connected with the ground;
a collector of the triode Q3 is connected with a +12V power supply through a resistor R31 and a resistor R34 which are connected in parallel, a collector of the triode Q3 is connected with one end of a resistor R32, the other end of the resistor R32 is connected with a connection pin a, one end of a capacitor C34 is connected in series with one end of a capacitor C37, the other end of the capacitor C34 is connected with a collector of a triode Q3, the other end of the capacitor C37 is connected with ground, one end of the capacitor C35 is connected in series with one end of the capacitor C38, the other end of the capacitor C35 is connected with the connection pin a, and the other end of the capacitor C38 is connected with ground;
the emitter of the transistor Q3 is grounded.
6. The single-pin dual-signal cooling fan control apparatus of claim 2,
the brushless motor is characterized by also comprising a power driving unit, and the microprocessor controls the brushless motor through the power driving unit.
7. The single-pin dual-signal cooling fan control apparatus of claim 6,
the microprocessor, the pulse width signal control unit, the fault feedback signal control unit and the power driving unit are integrated on one module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821138015.4U CN209980038U (en) | 2018-07-18 | 2018-07-18 | Single-pin double-signal cooling fan control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821138015.4U CN209980038U (en) | 2018-07-18 | 2018-07-18 | Single-pin double-signal cooling fan control device |
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| CN209980038U true CN209980038U (en) | 2020-01-21 |
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