A thermal protection system and method for a vehicle cooling fan ballast resistor circuit
A technology for cooling fans and ballast resistors, which is applied to automatic disconnection emergency protection devices, vehicle components, circuit devices, etc., can solve the problems of no circuit fault diagnosis method and inability to diagnose circuit faults, etc., to prevent circuit overheating damage and avoid accidents
Active Publication Date: 2019-10-18
QOROS
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Problems solved by technology
[0006] The disadvantage of the above thermal protection system is that when the overheating of the ballast resistor R triggers a circuit fault, the circuit voltage always shows normal before the disconnected thermal protection element TF', while the ballast resistor circuit C 3 ’The other branch C in parallel 4 Usually solidified in the cooling fan connector, so normal circuit voltage monitoring on the vehicle cannot diagnose this circuit fault, nor does it give other simple diagnostic methods for said circuit fault
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[0049] The thermal protection system and method of the vehicle cooling fan ballast resistor circuit according to the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the detailed description does not constitute a limitation of the present invention.
[0050] image 3 It shows the structure of the thermal protection system of the vehicle cooling fan ballast resistor circuit in an embodiment of the present invention. Such as image 3 As shown, the thermal protection system includes:
[0051] Power supply B, one end of which is connected to the ground wire GND of the vehicle frame;
[0052] The protection circuit of the vehicle is connected to the other end of the power supply B, and the protection circuit of the vehicle includes a first branch C 1 , the first branch C 1 is provided with the first vehicle circuit protection element F 1 ;
[0053] cooling fan voltage regulation circuit, wh...
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The present invention discloses a system for thermal protection of a vehicle cooling fan ballast resistor circuit. The system comprises: a power supply; a vehicle protection circuit at least comprising a first branch, wherein the first branch is provided with a first vehicle circuit protection element; a cooling fan voltage regulation circuit at least comprising a ballast resistor circuit, whereinthe ballast resistor circuit is provided with a ballast resistor, and the ballast resistor circuit is correspondingly connected with the first branch; a cooling fan motor; and a thermal protection circuit having one end being connected with the ballast resistor circuit at a position of the front end of the ballast resistor and the other end being earthed, wherein the thermal protection circuit isprovided with a thermal protection element. Correspondingly, the present invention further discloses a method for thermal protection of a vehicle cooling fan ballast resistor circuit. Circuit faultscan be triggered when a ballast resistor is overheating based on the system and the method for thermal protection to prevent the circuit from overheating damaging and avoid accidents. Besides, the system for thermal protection can simply perform diagnosis of the circuit faults.
Description
technical field [0001] The invention relates to a thermal protection system and method, in particular to a thermal protection system and method for a ballast resistance circuit. Background technique [0002] In automotive applications, powerful cooling fans are used to provide cooling air to equipment that needs to be cooled, such as interior cooling or engine cooling. However, during the cooling process, especially the cooling process of the engine, the flow rate of the cooling air needs to change greatly with the change of the ambient temperature and the temperature of the coolant, so it is necessary to configure a speed control system for the cooling fan. In order to avoid the use of complex and expensive cooling fan speed control systems (such as PWM-based control systems), two-stage or three-stage speed control schemes are used in many cases. [0003] In an existing two-stage or three-stage variable speed control scheme, the cooling fan motor is powered by a circuit in...
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IPC IPC(8): H02H5/04B60R16/02
Inventor 胡壮丰
Owner QOROS