An electronic fan control circuit system

Abstract

The present invention belongs to the field of electrical control technology, and in particular, relates to an electronic fan control circuit system. It includes an ECU, a battery, a first fan, a second fan, a first fuse, a second fuse, a first relay, a second relay, and a third relay. The battery provides power for the entire circuit; the ECU is respectively connected to the coil ends of the first relay, the second relay, and the third relay, and is used to output high-speed and low-speed control signals; the contact ends of the first relay, the second relay, and the third relay are connected to the battery and the first fan and the second fan, and are used to control the working states of the first fan and the second fan; the first fuse and the second fuse are connected in series between the battery and the first relay, the second relay, and the third relay, and are used for overcurrent protection. The present invention effectively improves the utilization rate of relays and fuses in the electronic fan control circuit system, reduces the number, reduces the circuit design cost, and improves economy.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical control, and in particular relates to an electronic fan control circuit system. Background Art

[0002] Existing electronic fans are generally divided into two speeds: high speed and low speed. The control circuit includes a relay and a fuse. The general control circuit is divided into two circuits to control the operation of the high speed fan and the low speed fan respectively. Figure 1 As shown in the figure, four relays (9, 10, 11, 12) are used, which has high hardware cost, circuit complexity and space occupation. A large number of relays will not only increase the cost, but also make the circuit wiring more complicated, increase the difficulty of maintenance and the failure rate; ECU (1) needs to control the actions of multiple relays at the same time to realize the high-speed and low-speed operation of the fan. The control signals of multiple relays are scattered, and the logical structure is relatively complex. The redundancy and complexity of the control signals may increase the system response time and reduce the control efficiency; the number of relays is large, and the number of contacts also increases. The reliability problem of relay contacts is more obvious, and the probability of contact wear and arc generation increases. The more relay contacts there are, the lower the reliability of the system, which is easy to cause a contact failure to affect the operation of the entire fan system; more relays (9, 10, 11, 12) are used, and the relay coil needs to be continuously powered, which increases the power consumption; there are many circuit connection points and devices, and the complexity of maintenance and troubleshooting is significantly increased. The complex circuit topology increases the system maintenance cost and makes troubleshooting more difficult. Summary of the invention

[0003] In view of this, the present invention provides an electronic fan control circuit system, which effectively improves the utilization rate of relays and fuses in the electronic fan control circuit system, reduces the number, reduces the circuit design cost, and improves the economy.

[0004] The technical solution adopted by the present invention is: an electronic fan control circuit system, including an ECU, a battery, a first fan, a second fan, a first fuse, a second fuse, a first relay, a second relay, and a third relay.

[0005] The battery provides power for the entire circuit;

[0006] The ECU is connected to the coil ends of the first relay, the second relay, and the third relay respectively, and is used to output high-speed and low-speed control signals;

[0007] The contact ends of the first relay, the second relay and the third relay are connected to the battery and the first fan and the second fan, and are used to control the working states of the first fan and the second fan;

[0008] The first fuse and the second fuse are connected in series between the battery and the first relay, the second relay and the third relay for overcurrent protection;

[0009] The first fan and the second fan are electrically connected to the battery through the first relay, the second relay and the third relay respectively, receive power and are driven to operate.

[0010] In the above technical solution, the ECU directly controls the relay, so that the system can flexibly switch the fan speed state (high speed / low speed) to meet the cooling needs under different working conditions; the battery provides a stable power supply, and the fuse overcurrent protection ensures circuit safety in the event of a fault, thereby improving the reliability and safety of the entire vehicle.

[0011] More preferably, the normally open and normally closed contacts of the first relay, the second relay and the third relay are interconnected with the first fan and the second fan, so that in a first control state, the first fan and the second fan are connected in series to achieve low-speed operation; in a second control state, the first fan and the second fan are connected in parallel to achieve high-speed operation.

[0012] Preferably, the first fuse and the second fuse are respectively located at corresponding power input ends of the fan series-parallel circuit, so as to provide protection for the circuit in different speed modes.

[0013] Preferably, the ECU is also connected to a temperature sensor, and controls the on and off of the first relay, the second relay, and the third relay according to the coolant temperature signal collected by the temperature sensor, so as to achieve precise adjustment of the rotation speeds of the first fan and the second fan.

[0014] In the above technical solution, the fan speed is accurately adjusted based on the real-time temperature signal to improve the cooling efficiency; unnecessary high-speed operation of the fan is reduced, energy consumption and noise are reduced, and the fan life is extended.

[0015] Preferably, the ECU can make a comprehensive judgment and output a high-speed or low-speed control signal based on at least one of multiple input signals including coolant temperature, vehicle speed signal and air-conditioning system pressure signal, so as to achieve optimized control of the first fan and the second fan.

[0016] In the above technical solution, the fusion of multi-dimensional input signals makes the fan control more intelligent and precise, and improves the adaptability of the overall cooling system; it intelligently selects the appropriate speed according to the actual operating conditions of the vehicle (high-speed driving, traffic jams, air conditioning on, etc.), reduces energy waste, and improves the economy and comfort of the entire vehicle.

[0017] More preferably, the first relay, the second relay and the third relay include at least one high-speed relay and one low-speed relay, the high-speed relay is connected to the first fan and the second fan to provide a higher operating voltage, and the low-speed relay is connected to the first fan and the second fan to provide a lower operating voltage, thereby realizing dual-speed or multi-speed control.

[0018] Preferably, the rated current values ​​of the first fuse and the second fuse can be selected according to the rated power and the required starting current of the first fan and the second fan to ensure that there is no overcurrent during normal operation and the protection circuit is blown in time under abnormal overcurrent conditions.

[0019] Preferably, the ECU also includes a fault diagnosis function, which outputs a fault signal and records a fault code for later maintenance when it detects that the coils of the first relay, the second relay, and the third relay are open-circuited or short-circuited, or the first fan and the second fan are abnormally started.

[0020] When the relay coil is open, the contacts are stuck, or the fan is overloaded and cannot start normally, the ECU will record the fault code and output it through the bus interface; this will help with subsequent maintenance and repairs; the ECU can also display the fault information in the on-board diagnostic system to quickly locate the source of the problem.

[0021] In the above technical solution, the fault self-detection and recording mechanism improves the diagnosability of the system, facilitates rapid positioning and repair; reduces maintenance costs and repair time, and improves the continuity and reliability of vehicle operation.

[0022] More preferably, the ECU can dynamically adjust the operating frequency and duration of the first relay, the second relay, and the third relay according to the vehicle operating status, so as to reduce the power consumption of the first fan and the second fan and extend their service life while meeting the heat dissipation requirements.

[0023] In the above technical solution, the fan operation is flexibly scheduled according to actual needs to avoid ineffective power consumption while maintaining the ideal operating temperature range; the mechanical stress caused by frequent starting and stopping of the fan is reduced, and the service life of the fan and electrical components is increased.

[0024] Preferably, a fault indicator light or display module is also included. When the first fuse or the second fuse blows or the first relay, the second relay, or the third relay fails to work normally, the fault information is displayed through the indicator light or the on-board instrument, so that the driver can find and deal with it in time.

[0025] If the fan cannot operate normally due to a blown fuse or a faulty relay, the ECU can control the fault indicator light to light up or display relevant information in the on-board instrument to prompt the driver to check and handle it in time; this improves the maintainability and reliability of the system.

[0026] In the above technical solution, timely fault reminders are provided to drivers and maintenance personnel to avoid potential hazards caused by hidden faults; the safety and ease of use of vehicles are improved, and user satisfaction is improved.

[0027] The electronic fan control circuit system provided by the present invention is an intelligent, highly reliable, maintainable and efficient fan control circuit. While improving the heat dissipation management efficiency of key engine and vehicle components, it also takes into account multiple requirements such as safety protection, energy consumption optimization, extended operating life, and fault diagnosis and indication, thereby making the vehicle cooling system more competitive and having a better market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of circuit connection in the prior art;

[0029] Figure 2 It is a circuit connection schematic diagram of the present invention. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 2 As shown, the electronic fan control circuit system of the present invention includes an ECU 1, a battery 2, a first fan 3, a second fan 4, a first fuse 5, a second fuse 6, a first relay 7, a second relay 8, and a third relay 9.

[0032] Battery 2 provides power for the entire circuit;

[0033] The ECU 1 is connected to the coil ends of the first relay 7, the second relay 8, and the third relay 9, respectively, and is used to output high-speed and low-speed control signals;

[0034] The contact ends of the first relay 7, the second relay 8 and the third relay 9 are connected to the battery 2 and the first fan 3 and the second fan 4, and are used to control the working states of the first fan 3 and the second fan 4;

[0035] The first fuse 5 and the second fuse 6 are connected in series between the battery 2 and the first relay 7, the second relay 8, and the third relay 9 for overcurrent protection;

[0036] The first fan 3 and the second fan 4 are electrically connected to the battery 2 through the first relay 7, the second relay 8 and the third relay 9 respectively, receive power and are driven to operate.

[0037] In some optional embodiments, ECU 1 is a control unit for high-speed / low-speed operation of the fan, and two pins control the high-speed / low-speed operation of the fan respectively, and the output signal is high and effective.

[0038] In some optional embodiments, the battery 2 provides power for the high-speed / low-speed operation of the fan, and the positive electrode of the battery is connected to the positive terminal of the fan motor through a fuse and a relay; the negative electrode of the battery is directly connected to the negative terminal of the fan motor.

[0039] In some optional embodiments, the normally open and normally closed contacts of the first relay 7, the second relay 8 and the third relay 9 are interconnected with the first fan 3 and the second fan 4, so that in a first control state, the first fan 3 and the second fan 4 are connected in series to achieve low-speed operation; in a second control state, the first fan 3 and the second fan 4 are connected in parallel to achieve high-speed operation.

[0040] The first fuse 5 and the second fuse 6 are respectively located at corresponding power input ends of the fan series-parallel circuit, and are used to provide protection for the circuit in different speed modes.

[0041] In some optional embodiments, ECU 1 is also connected to a temperature sensor, and controls the on and off of the first relay 7, the second relay 8, and the third relay 9 according to the coolant temperature signal collected by the temperature sensor, so as to achieve precise adjustment of the speed of the first fan 3 and the second fan 4.

[0042] In some optional embodiments, ECU 1 can make a comprehensive judgment and output a high-speed or low-speed control signal based on at least one of multiple input signals including coolant temperature, vehicle speed signal and air-conditioning system pressure signal to achieve optimized control of the first fan 3 and the second fan 4.

[0043] In some optional embodiments, the first relay 7, the second relay 8, and the third relay 9 include at least one high-speed relay and one low-speed relay, the high-speed relay is connected to the first fan 3 and the second fan 4 to provide a higher operating voltage, and the low-speed relay is connected to the first fan 3 and the second fan 4 to provide a lower operating voltage, thereby realizing dual-speed or multi-speed control.

[0044] In some optional embodiments, the first relay 7, the second relay 8, and the third relay 9 are single-pole single-throw normally open relays. When the electronic control unit 1 applies a control signal to the coil end, the relay contacts close, so that the first fan 3 and the second fan 4 obtain power and thus operate.

[0045] In some optional embodiments, the first relay 7 is a relay with a larger capacity, 70A; the second relay 8 is a relay with a larger capacity, 70A; and the third relay 9 is a relay with a smaller capacity, 40A.

[0046] In some optional embodiments, the rated current values ​​of the first fuse 5 and the second fuse 6 can be selected according to the rated power and the required starting current of the first fan 3 and the second fan 4 to ensure that there is no overcurrent during normal operation and the protection circuit is blown in time under abnormal overcurrent conditions.

[0047] In some optional embodiments, the first fuse 5 is a larger capacity fuse, 60A; the second fuse 6 is a smaller capacity fuse, 40A.

[0048] In some optional embodiments, the first fan 3 and the second fan 4 are brushless DC fans, and efficient, low-noise and controllable speed adjustment is achieved through the control of the first relay 7, the second relay 8 and the third relay 9. Under the control of the ECU 1 and the relays, not only can high-speed and low-speed switching be achieved, but the brushless structure also makes the fan run more efficiently, with lower noise and longer life.

[0049] In some optional embodiments, the first fan 3 is a high-power fan with a rated current of 30A when working at low speed and a rated current of 55A when working at high speed; the second fan 4 is a low-power fan with a rated current of 20A when working at low speed and a rated current of 35A when working at high speed.

[0050] In some optional embodiments, ECU 1 also includes a fault diagnosis function. When it is detected that the coils of the first relay 7, the second relay 8, and the third relay 9 are open or short-circuited, or the first fan 3 and the second fan 4 are not started normally, a fault signal is output and a fault code is recorded for later maintenance.

[0051] In some optional embodiments, ECU 1 can adjust the operating frequency and duration of the first relay 7, the second relay 8, and the third relay 9 according to the dynamic operating state of the vehicle (such as low-speed driving in the city, high-speed cruising, fierce acceleration or uphill), changes in ambient temperature, or changes in engine operating conditions, so as to reduce the power consumption of the first fan 3 and the second fan 4 and extend their service life while meeting the heat dissipation requirements.

[0052] In some optional embodiments, a fault indicator light or a display module is also included. When the first fuse 5, the second fuse 6 is blown or the first relay 7, the second relay 8, and the third relay 9 cannot work normally, the fault information is displayed through the indicator light or the vehicle instrument, so that the driver can find and deal with it in time.

[0053] Two working modes of an electronic fan control circuit system of the present invention:

[0054] High-speed mode:

[0055] When the high-speed control output of ECU 1 is high level, the second relay 8 and the third relay 9 are simultaneously energized, thereby forming two independent high-speed power supply circuits:

[0056] Positive pole of battery 2 → first fuse 5 → contact of second relay 8 → first fan 3 → negative pole of battery 2;

[0057] Positive pole of battery 2 → second fuse 6 → contact of third relay 9 → second fan 4 → negative pole of battery 2;

[0058] In this state, the first fan 3 and the second fan 4 are respectively supplied with independent and sufficient power, and run at high speed to improve the heat dissipation effect.

[0059] Low speed mode:

[0060] When the low speed control output of ECU 1 is high level, the low speed first relay 7 is energized, forming the following circuit:

[0061] Positive electrode of battery 2 → first fuse 5 → contact of first relay 7 → first fan 3 and second fan 4 in parallel → negative electrode of battery 2;

[0062] At this time, the first fan 3 and the second fan 4 are simultaneously operated at a low speed with a relatively low voltage or in a serial connection mode depending on the specific circuit design, thereby reducing energy consumption and noise while ensuring necessary heat dissipation.

[0063] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. An electronic fan control circuit system, comprising an ECU (1), a battery (2), a first fan (3), a second fan (4), a first fuse (5), a second fuse (6), a first relay (7), a second relay (8), and a third relay (9), characterized in that: The storage battery (2) provides power for the entire circuit; The ECU (1) is connected to the coil ends of the first relay (7), the second relay (8), and the third relay (9) respectively, and is used to output high-speed and low-speed control signals; The contact ends of the first relay (7), the second relay (8) and the third relay (9) are connected to the battery (2) and the first fan (3) and the second fan (4) and are used to control the working states of the first fan (3) and the second fan (4); The first fuse (5) and the second fuse (6) are connected in series between the battery (2) and the first relay (7), the second relay (8), and the third relay (9) for overcurrent protection; The first fan (3) and the second fan (4) are electrically connected to the battery (2) through the first relay (7), the second relay (8) and the third relay (9) respectively, and receive power and are driven to operate.

2. The electronic fan control circuit system according to claim 1, characterized in that: The normally open and normally closed contacts of the first relay (7), the second relay (8) and the third relay (9) are interconnected with the first fan (3) and the second fan (4), so that in a first control state, the first fan (3) and the second fan (4) are connected in series to achieve low-speed operation; in a second control state, the first fan (3) and the second fan (4) are connected in parallel to achieve high-speed operation.

3. The electronic fan control circuit system according to claim 2, characterized in that: The first fuse (5) and the second fuse (6) are respectively located at corresponding power input ends of the fan series-parallel circuit, and are used to provide protection for the circuit in different speed modes.

4. The electronic fan control circuit system according to claim 1, characterized in that: The ECU (1) is also connected to a temperature sensor and controls the on and off of the first relay (7), the second relay (8) and the third relay (9) according to a coolant temperature signal collected by the temperature sensor, so as to adjust the rotation speed of the first fan (3) and the second fan (4).

5. An electronic fan control circuit system according to claim 1 or 4, characterized in that: The ECU (1) can make a comprehensive judgment and output a high-speed or low-speed control signal based on multiple input signals including at least one of a coolant temperature, a vehicle speed signal and an air conditioning system pressure signal, so as to control the first fan (3) and the second fan (4).

6. The electronic fan control circuit system according to claim 1, characterized in that: The first relay (7), the second relay (8) and the third relay (9) include at least one high-speed relay and one low-speed relay, the high-speed relay is connected to the first fan (3) and the second fan (4) to provide a higher operating voltage, and the low-speed relay is connected to the first fan (3) and the second fan (4) to provide a lower operating voltage, thereby realizing dual-speed or multi-speed control.

7. The electronic fan control circuit system according to claim 1, characterized in that: The rated current values ​​of the first fuse (5) and the second fuse (6) can be selected according to the rated power of the first fan (3) and the second fan (4) and the required starting current, so as to ensure that there is no overcurrent during normal operation and that the protection circuit is promptly blown in an abnormal overcurrent condition.

8. The electronic fan control circuit system according to claim 1, characterized in that: The ECU (1) also includes a fault diagnosis function, which outputs a fault signal and records a fault code when it is detected that the coils of the first relay (7), the second relay (8) or the third relay (9) are open-circuited or short-circuited, or the first fan (3) or the second fan (4) is not started normally.

9. The electronic fan control circuit system according to claim 1, characterized in that: The ECU (1) can dynamically adjust the operating frequency and duration of the first relay (7), the second relay (8) and the third relay (9) according to the vehicle operation state, thereby reducing the power consumption of the first fan (3) and the second fan (4).

10. The electronic fan control circuit system according to claim 1, characterized in that: It also includes a fault indicator light or a display module. When the first fuse (5) or the second fuse (6) is blown or the first relay (7), the second relay (8) or the third relay (9) fails to work normally, the fault information is displayed through the indicator light or the on-board instrument, so that the driver can find and handle the fault in time.

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