CN110501604B - Detection device and detection method for open-circuit fault of brushed direct-current fan - Google Patents
Detection device and detection method for open-circuit fault of brushed direct-current fan Download PDFInfo
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- CN110501604B CN110501604B CN201910777974.3A CN201910777974A CN110501604B CN 110501604 B CN110501604 B CN 110501604B CN 201910777974 A CN201910777974 A CN 201910777974A CN 110501604 B CN110501604 B CN 110501604B
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Abstract
The invention discloses a detection device and a detection method for an open-circuit fault of a brushed direct current fan, wherein the detection device comprises the following steps: detecting the current flowing through the fan in real time in the operation stage of the fan; if the current is larger than zero, the fan is considered to have no open-circuit fault; if the current is zero, further closing the MOSFET for driving the fan, detecting the voltage of the positive pole of the fan connector after delaying for 1 millisecond, and if the voltage value is zero, judging that the fan has an open circuit fault. The open-circuit fault of the air conditioner can be accurately detected by combining current detection and voltage detection.
Description
Technical Field
The invention belongs to the field of fans, relates to the technical field of fan fault detection, and particularly relates to a detection device and a detection method for an open-circuit fault of a brushed direct-current fan.
Background
For the automobile industry, a brushed direct current fan is widely applied to a cooling system, a traditional automobile adopts a speed regulating resistor to regulate the speed of the fan, stepless speed regulation and fan state monitoring cannot be realized, the energy-saving requirement cannot be met, and in order to overcome the defects, a direct current fan controller is introduced into the automobile cooling system. And reporting the fault type of the fan cooling system to the whole vehicle according to the requirement of the whole vehicle system. The open circuit fault is one of fan faults, has a large influence on the reliability of the fan and the controller, and has a large diagnosis difficulty compared with other faults. When the fan is in operation, if the fan has an open-circuit fault and the controller fails to accurately detect the open-circuit fault, the controller continues to drive the power MOSFET to be switched on. If the fan and the connector are restored to contact due to other reasons, a large starting current can be caused, and the fan driving unit is damaged. To avoid this risk, common open-circuit fault detection methods include voltage detection methods and current detection methods. The voltage detection method needs to switch off the fan drive frequently, which can cause the fan to shake and noise, and to a certain extent, the operation of the fan and the service life of components can be affected, while the current detection method does not need to switch off the fan drive frequently, but can not accurately judge whether an open circuit fault occurs in certain application occasions at certain risks. For example, in an automobile engine cooling fan system, if a cooling fan bears a large amount of frontal wind, a fan is in a power generation state, and the actual rotating speed of the fan is greater than the rotating speed output by the fan drive, the detected current is zero, and the fan is erroneously determined to be open.
Disclosure of Invention
In order to solve the problems, the invention provides a detection device and a detection method for an open-circuit fault of a brushed direct-current fan, and the specific technical scheme is as follows:
the utility model provides a detection apparatus that brush direct current fan opens a way trouble, includes motor drive Q1, fan M1, sampling resistor R4 fan connector positive pole connecting resistance R2 and R3, the singlechip is connected at R3 both ends and carries out AD function sampling, processing apparatus and singlechip are put to voltage fortune to resistance R4 both ends connection.
As a further improvement, the method is characterized in that: and a capacitor C1 is connected to two ends of the R3. After the capacitor is connected in parallel, the voltage detection can be more accurate, and after the capacitor is subjected to detection for a plurality of times, the residual voltage in the last detection can be eliminated, so that the accuracy of the detection result is ensured.
As a further improvement, the method is characterized in that: and a resistor R1 is connected with two ends of the motor drive Q1.
A method for detecting an open-circuit fault of a brushed direct-current fan comprises the following specific steps:
step 1: detecting the current flowing through the fan, if the current is not zero, the fan is not opened, and if the current is zero, the driving MOSFET is closed;
step 2: delaying 1 millisecond after closing the drive MOSFET, detecting the voltage of the positive pole of the fan connector, if the detected voltage is not zero, the fan is not opened, and if the detected voltage is zero, the fan is in an open-circuit fault.
As a further improvement, the method is characterized in that: a sampling resistor is connected in series in the circuit, and AD sampling is carried out on the voltage at two ends of the sampling resistor, so that the current passing through the fan is obtained through conversion.
As a further improvement, the method is characterized in that: and the positive electrode of the fan connector is connected with resistors R2 and R3, and the two ends of R3 are connected with a singlechip to perform AD function sampling so as to obtain the voltage at the two ends of R3.
The detection method comprises the steps of firstly detecting the current of the fan, if the current is not zero, the fan is in a path, the fan is not in an open circuit, if the current is zero, the open circuit condition possibly exists, for more accuracy and reliability, detecting the voltage of the positive electrode of the fan connector, if the current is zero, the fan is in an open circuit, otherwise, the fan is not in an open circuit.
The detection device and the detection method for the open-circuit fault of the brushed direct-current fan provided by the invention judge whether the fan is open-circuit or not through the detection of current and voltage, avoid the defects of fan jitter and misjudgment caused by single detection, ensure that the operation of the fan is not influenced while the open-circuit fault of the fan is accurately judged, and have the advantages of accuracy, reliability and strong practicability.
Drawings
FIG. 1 is a flow chart of a method for detecting an open circuit fault in a brushed DC fan according to the present invention.
Fig. 2 is a structural circuit diagram of the open-circuit fault detection device of the brushed direct-current fan.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
The utility model provides a detection apparatus that brush direct current fan opens a way trouble, as shown in fig. 2, including motor drive Q1, fan M1, sampling resistor R4 fan connector positive pole connecting resistance R2 and R3, the singlechip is connected at R3 both ends and carries out AD function sampling, voltage operational amplifier processing apparatus and singlechip are connected at resistance R4 both ends, a electric capacity C1 is connected at R3 both ends, a resistance R1 is connected at motor drive Q1 both ends.
A method for detecting an open-circuit fault of a brushed direct-current fan comprises the following specific steps:
step 1: detecting the current flowing through the fan, if the current is not zero, the fan is not opened, and if the current is zero, the driving MOSFET is closed;
step 2: delaying 1 millisecond after closing the drive MOSFET, detecting the voltage of the positive pole of the fan connector, if the detected voltage is not zero, the fan is not opened, and if the detected voltage is zero, the fan is in an open-circuit fault.
The whole flow schematic diagram is shown in figure 1, the circuit structure is shown in figure 2, a sampling resistor R4 is connected in series in the circuit, after the voltage at two ends of the sampling resistor R4 is subjected to operational amplification, the AD function of the single chip microcomputer is utilized for sampling, the required current can be obtained through conversion, whether the obtained current is zero or not is judged, and if the current is not zero, the fan is not subjected to open-circuit fault. If the voltage is zero, the drive MOSFET is closed, 1 millisecond is delayed, and the voltage of the positive electrode of the fan connector is further detected; the connection part of the motor drive Q1 and the fan M1 is the positive pole of the fan connector, and through the voltage division of the resistors R2 and R3, the voltage at the two ends of the resistor R3 can be sampled by the single chip microcomputer through the AD function so that the positive voltage of the fan connector can be detected. And after Q1 is turned off for 1 millisecond, detecting the voltage of the positive electrode of the fan connector by utilizing the AD sampling function of the single chip microcomputer. At this time, since Q1 is completely turned off, the sampled voltage is the counter potential of the fan, and it is checked whether the detected voltage is zero, and if not, it is determined that the open-circuit fault of the fan has not occurred. And if the value is zero, judging that the fan has an open-circuit fault.
In the running stage of the fan, if the detected current is not zero, the current loop is normal, the fan is well connected with the connector, and the open-circuit fault is not generated. If the current is zero, whether an open-circuit fault occurs needs to be further judged through voltage detection, and the condition that the fan is open-circuit is mistakenly considered is avoided. If the detected current is zero, two situations may exist. Firstly, the fan really has taken place to open a way, secondly the condition that actual rotational speed is greater than the drive output rotational speed has appeared to the fan, no matter in which kind of condition, closes fan drive Q1 this moment and can not influence the performance (rotational speed) of system, closes the fan drive back, needs 1 ms of time delay in order to ensure that the drive has closed completely. Because the fan has certain rotational speed under the external condition, if the fan contacts well with the connector, the counter potential voltage detected at the moment is not zero, and the fan can be judged not to be opened. If the fan is disconnected with the connector, the detected counter electromotive force voltage of the fan is zero, and whether the fan is in an open circuit or not can be judged according to the detected voltage result.
According to the detection method, voltage detection is added on the basis of current detection, double detection is carried out to ensure the accuracy of fan open-circuit fault judgment, and compared with the traditional single current or voltage detection, the detection method is more reliable.
Claims (5)
1. The utility model provides a detection apparatus for brush direct current fan fault of opening a way which characterized in that: the device comprises a motor drive Q1, a fan M1 and a sampling resistor R4, wherein the positive electrode of a fan connector is connected with a resistor R2 and a resistor R3, the two ends of R3 are connected with a single chip microcomputer to perform AD function sampling, and the two ends of the resistor R4 are connected with a voltage operational amplifier processing device and the single chip microcomputer; detecting the current flowing through the fan, if the current is not zero, the fan is not opened, if the current is zero, closing the driving MOSFET, delaying for 1 millisecond after closing the driving MOSFET, detecting the voltage of the positive pole of the fan connector, if the detected voltage is not zero, the fan is not opened, and if the detected voltage is zero, the fan is opened, and the fan is failed.
2. The apparatus according to claim 1, wherein the apparatus comprises: and a capacitor C1 is connected to two ends of the R3.
3. The apparatus according to claim 1, wherein the apparatus comprises: and a resistor R1 is connected with two ends of the motor drive Q1.
4. The apparatus according to claim 1, wherein the apparatus comprises: a sampling resistor is connected in series in the circuit, and AD sampling is carried out on the voltage at two ends of the sampling resistor, so that the current passing through the fan is obtained through conversion.
5. The apparatus according to claim 1, wherein the apparatus comprises: and the positive electrode of the fan connector is connected with resistors R2 and R3, and the two ends of R3 are connected with a singlechip to perform AD function sampling so as to obtain the voltage at the two ends of R3.
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| CN201910777974.3A CN110501604B (en) | 2019-08-22 | 2019-08-22 | Detection device and detection method for open-circuit fault of brushed direct-current fan |
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| CN201910777974.3A CN110501604B (en) | 2019-08-22 | 2019-08-22 | Detection device and detection method for open-circuit fault of brushed direct-current fan |
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| CN110501604B true CN110501604B (en) | 2021-10-12 |
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