CN110346682B - Output connection state detection circuit and method for DCDC converter of electric vehicle - Google Patents
Output connection state detection circuit and method for DCDC converter of electric vehicle Download PDFInfo
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- CN110346682B CN110346682B CN201910630404.1A CN201910630404A CN110346682B CN 110346682 B CN110346682 B CN 110346682B CN 201910630404 A CN201910630404 A CN 201910630404A CN 110346682 B CN110346682 B CN 110346682B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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Abstract
The invention discloses a circuit and a method for detecting the output connection state of a DCDC converter of an electric vehicle, wherein the circuit comprises an output end of the DCDC converter, a fuse, a 12V storage battery, a DCDC output voltage detection circuit, a first voltage detection circuit, a second voltage detection circuit and a storage battery output voltage detection circuit, wherein the output end of the DCDC converter is connected with a fuse through a positive output wire harness, the fuse is connected with the 12V storage battery, the output end of the DCDC output voltage detection circuit is respectively connected with the input end of a control circuit, and the control circuit judges the connection state between the DCDC converter and the 12V storage battery according to collected voltage data. The invention has the advantages that: the voltage of different positions connected between the DCDC converter and the 12V storage battery is collected through the circuit, the connection state is judged according to the voltage, the method is simple, quick and reliable, and the function of the DCDC converter for connection state fault alarm is realized.
Description
Technical Field
The invention relates to the field of detection of a DCDC converter of an electric vehicle, in particular to a circuit and a method for detecting an output connection state of the DCDC converter of the electric vehicle.
Background
With the development of electric automobile technology, the DCDC converter has from early hard-wire control to the current CAN communication and diagnosis function, but the connection state of the low-voltage positive output wire harness and the output fuse of the DCDC converter is basically not detected and diagnosed.
At present, the low-voltage output terminal of the DCDC converter is mostly fixed by an aviation plug-in or a terminal and a bolt in a connection mode of an output wire harness, and the positive wire harness is connected with a 12V storage battery through a fuse. The problems of improper connection of aviation plug-ins, needle withdrawing, loosening of bolt fixing terminals, disconnection of fuses and the like cannot be timely and accurately detected and reported. The circuit in the prior art cannot detect the fault and carry out fault detection and reporting.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circuit and a method for detecting the output connection state of a DCDC converter of an electric vehicle, which are used for detecting the connection state between the output end of the DCDC converter and a 12V storage battery.
In order to achieve the purpose, the invention adopts the technical scheme that: the detection circuit comprises a DCDC converter output connection state detection circuit, a first voltage detection circuit, a second voltage detection circuit and a storage battery output voltage detection circuit, wherein the output end of the DCDC converter is connected with a fuse through a positive output wire harness, the fuse is connected with a 12V storage battery, the DCDC output voltage detection circuit is used for detecting the voltage of the output end of the DCDC converter, and the output end of the DCDC voltage detection circuit is connected with a control circuit; the first voltage detection circuit is used for detecting the voltage of one end of the fuse connected with the output wire harness, the other end of the fuse is detected by the second voltage detection circuit, the output ends of the first voltage detection circuit and the second voltage detection circuit are respectively connected with the input end of the control circuit, the storage battery output voltage detection circuit is used for detecting the voltage of two ends of a 12V storage battery, and the output end of the storage battery output voltage detection circuit is connected with the input end of the control circuit; and the control circuit judges the connection state between the DCDC converter and the 12V storage battery according to the acquired voltage data.
The DCDC output voltage detection circuit, the first voltage detection circuit, the second voltage detection circuit and the storage battery output voltage detection circuit respectively acquire corresponding voltage data in a resistance voltage division mode and send the voltage data to the control circuit.
The control circuit is a control chip integrated in the DCDC converter.
The DCDC output voltage detection circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected with the low-voltage output end of the DCDC converter, the other end of the resistor R2 is grounded, and an output terminal is led out from a connecting line between the resistors R1 and R2 and is connected with the input end of the control circuit.
The first voltage detection circuit comprises resistors R3 and R4, one end of a positive output wire harness is connected with the positive electrode of the DCDC converter, the other end of the positive output wire harness is connected with a fuse, a voltage detection point is led out from the connection position of the positive output wire harness and is connected with one end of a resistor R3, the other end of the resistor R3 is grounded through a resistor R4, and an output terminal is led out from a connecting line between the resistors R3 and R4 and is connected with the input end of the control circuit.
The second voltage detection circuit comprises resistors R5 and R6, the fuse is connected with a positive post wiring terminal of the storage battery, a connection wire is led out from the connection position and connected with one end of the resistor R5, the other end of the resistor R5 is grounded through the resistor R6, and the connection wire is led out between the resistors R5 and R6 and connected with the input end of the control circuit.
The storage battery voltage detection circuit comprises resistors R7 and R8, the anode of the 12V storage battery is connected with one end of a resistor R7, the other end of the resistor R7 is grounded through a resistor R8, and a terminal is led out between the resistors R7 and R8 and connected with the input end of the control circuit.
The detection method of the output connection state detection circuit of the DCDC converter of the electric automobile comprises the following steps that the control circuit acquires voltage data of detection electricity between the output end of the DCDC converter and a 12V storage battery; wherein the collected voltage data includes: output voltage V _ofDCDC converter output endDCVoltage data V _atthe junction of the positive output harness and the fuseSEN1The voltage V _atthe junction of the fuse and the positive pole of the 12-cellSEN2And real-time voltage V _, at two ends of 12V accumulatorKL30；
The control circuit judges the output connection state of the DCDC converter according to the acquired voltage data:
when V \uDCAnd V \ uSEN1When the voltage difference is less than or equal to a preset threshold value delta V2, the connection state between the positive output terminal of the DCDC converter and the positive output wire harness and between the fuse and the positive pole of the 12V storage battery is good；
When Vo and V \uSEN1When the voltage difference is larger than a preset threshold value delta V2, the connection state of the terminals between the positive output terminal of the DCDC converter and the wiring harness or the connection position of the fuse and the 12V storage battery is failed;
when V \uSEN1And V \ uSEN2When the voltage is equal, the connection state of the positive output wire harness and the terminal at the connection part of the fuse and the 12V storage battery is good, and the low-voltage output fuse is good; if when V \uSEN1And V \ uSEN2When the voltage is not equal, the connection state of the connection position of the positive output wire harness and the fuse and the terminal connection state of the connection position of the fuse and the 12V storage battery are in a problem, or the low-voltage output fuse is fused;
when V \uSEN2And V \ uKL30When the voltage is equal, the connection state of the terminal at the connection part of the fuse and the 12V storage battery is good; if V \uSEN2And V \ uKL30When they are not equal, it is described that there is a problem in the terminal connection state at the connection of the fuse and the 12V battery, or that there is a problem in the KL30 harness.
The preset threshold value delta V2 is V _KL30To VSEN1The maximum voltage difference Δ V2 due to the positive wire harness resistance and the contact resistance.
And the control circuit judges the connection state according to the voltage data and then uploads the judgment result to the whole vehicle for alarming or displaying.
The invention has the advantages that: the voltage of different positions of connection between the DCDC converter and the 12V storage battery is collected through the circuit, the connection state is judged according to the voltage, the method is simple, quick and reliable, the function of the DCDC converter for connection state fault alarm is achieved, and meanwhile the specific fault type, the fault position of the connection state and the like can be judged. Meanwhile, the circuit structure is simple and reliable, the cost is low, and the realization is convenient.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic view of the detection principle of the present invention;
FIG. 2 is a circuit diagram of the detection circuit of the present invention.
The reference numerals in the figures are respectively: 1. a power battery; 2. a DCDC converter; 3. a 12V battery; 4. a fixed point 1; 5, a positive output fuse; 6. a fixed point 2;
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The invention utilizes the DCDC converter to detect the connection state of the positive output wire harness and the fuse of the DCDC converter and accurately report the connection state in time. The three voltage values of the connection positions of the output end of the direct current DC converter, the output wire harness, the output fuse and the 12V storage battery are detected by the DCDC converter, and whether the positive output wire harness and the output fuse are reliably connected or not is judged according to the sampling voltage value, the resistance of the positive output wire harness tested by a real vehicle and the contact resistance value.
When the DCDC converter works, the input end of the DCDC converter is connected with the high voltage of a power battery, the high voltage filtering is carried out through a filter consisting of an inductor and a capacitor, high-voltage direct current is inverted into alternating current voltage by applying a high-frequency Pulse Width Modulation (PWM) technology, the alternating current voltage is input to the primary side of a high-frequency transformer, the secondary side of the transformer outputs induction voltage, the induction voltage is output after rectification filtering, the output voltage supplies power for a low-voltage system of the whole vehicle, and meanwhile, a 12V storage battery is charged. The voltage and current sampling circuit outputs voltage and current sampling values to the control circuit, and the control circuit controls the power circuit through a control algorithm to realize stable output of a low-voltage end. The DCDC output positive fuse has larger rated current, and two ends are basically fixed by bolts.
As shown in fig. 1, the output positive electrode of the DCDC converter is connected with the positive output wire harness through an aviation plug-in or a terminal; the other end of the positive wire harness is connected with a positive output fuse and a voltage detection 1 wire harness, and a positive wire harness terminal, a fuse terminal and a voltage detection 1 wire harness terminal are fixed together by using bolts to form a fixed point 1; the other terminal of the fuse and the voltage detection 2 wire harness terminal are fixed on a 12V storage battery positive pole terminal through bolts to form a fixing point 2. The voltages at the two points of voltage detection 1 and voltage detection 2 are input to the DCDC. The 12V storage battery supplies power to the DCDC converter control circuit through a KL30 line.
The fixed point 1 corresponds to a detection point 1, namely a detection point of a first voltage detection circuit, a voltage detection 1 wire harness is a detection wire harness of the first voltage detection circuit, the first voltage detection circuit comprises resistors R3 and R4, one end of a positive output wire harness is connected with a positive electrode of a DCDC converter, the other end of the positive output wire harness is connected with a fuse at the fixed point 1, a voltage detection point is arranged at the position connected with the fuse, the detection wire harness is connected with the detection point and is connected with one end of a resistor R3, the other end of the resistor R3 is grounded through a resistor R4, and an output terminal is led out from a connecting line between the resistors R3 and R4 to be connected with an input end of a control circuit.
The fixed point 2 corresponds to a detection point 2, a second voltage detection circuit is adopted to detect the voltage of the detection point, the detection point 2 is connected with the detection point through a voltage detection 2 wire harness, the detection 2 wire harness is connected with the second voltage detection circuit, the second voltage detection circuit comprises resistors R5 and R6, the fuse is connected with a positive post wiring terminal of the storage battery, a wiring is led out from the connection position and connected with one end of a resistor R5, the other end of the resistor R5 is grounded through a resistor R6, and a wiring is led out between the resistors R5 and R6 and connected with the input end of the control circuit.
The detected voltage also comprises a DCDC output voltage signal, the detection is realized by a DCDC output voltage detection circuit, the DCDC output voltage detection circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with the low-voltage output end of the DCDC converter, the other end of the resistor R2 is grounded, and an output terminal is led out from a connecting line between the resistors R1 and R2 and is connected with the input end of the control circuit.
The detection voltage also comprises a 12V storage battery voltage detection circuit, the storage battery voltage detection circuit comprises resistors R7 and R8, the positive electrode of the 12V storage battery is connected with one end of a resistor R7, the other end of the resistor R7 is grounded through a resistor R8, and a terminal is led out between the resistors R7 and R8 and connected with the input end of the control circuit.
All detected voltage signals are input to the input end of the control circuit, and the control circuit judges the connection state between the DCDC converter and the 12V storage battery according to the collected voltage data. The control circuit is a control chip or a processing chip with data processing capability. The method can be realized by adopting a basic DSP chip or a single chip microcomputer, in order to save cost and simplify design, the method is realized by adopting a control chip in a DCDC converter, and the control chip in the DCDC converter is used for analyzing voltage to achieve the judgment of a connection state.
The DCDC converter detects a voltage value V _ DC of a positive electrode output terminal positioned in the shell, namely the voltage of the DCDC output terminal, and the voltage value V _ DC is used as a control signal of output voltage, the V _ DC is subjected to voltage division by R1 and R2 and then is input to the control circuit, the control circuit collects the voltage value V _ DC R2/(R1+ R2), and the control chip converts the voltage value into the output voltage V _ DC through a program. The voltage V _ SEN1 of the fixed point 1 is divided by R3 and R4 and then input to a control circuit, the control circuit collects the voltage value V _ SEN 1R 4/(R3+ R4), and the control chip converts the voltage value into V _ SEN1 through a program. The voltage V _ SEN2 of the fixed point 2 is divided by R5 and R6 and then is input to a control circuit, the control circuit collects the voltage value V _ SEN 2R 6/(R5+ R6), and the control chip converts the voltage value into V _ SEN2 through a program. The voltage V _ KL30 of the KL30 is divided by R7 and R8 and then input to the control circuit, the control circuit collects the voltage value of Vo R8/(R7+ R8), and the control chip converts the voltage value into V _ KL30 through a program.
In the non-operating state of the DCDC converter, the voltage of the 12V storage battery is V _ BAT, and the V _ DC is higher than the V _ BAT by delta V1 so as to realize the function of charging the small battery. Under the DCDC maximum output current condition, the maximum voltage difference from Vo (battery voltage) to V _ SEN1 due to the positive wire harness resistance and the contact resistance is Δ V2. V _ SEN1 is equal to V _ SEN2, V _ SEN2 is equal to V _ KL30, and V _ KL30 is the real-time voltage at two ends of the 12V storage battery. Δ V1 is much larger than Δ V2.
The control circuit judges the connection state according to the acquired voltage data and uploads a fault signal, and a state judgment method is integrated in a control chip of the DCDC converter to realize the judgment of the connection state, wherein the judgment method comprises the following steps:
when the voltage difference between V _ DC and V _ SEN1 is equal to or less than Δ V2, it indicates that the connection state between the DC converter positive output terminal and the wire harness and the terminal at the fixed point 2 is good. If the differential pressure between Vo and V _ SEN1 is greater than Δ V2, it indicates that there is a problem in the connection state between the DCDC converter positive output terminal and the wire harness or the terminal at the fixed point 2.
When V _ SEN1 and V _ SEN2 are equal, it is demonstrated that the terminal connection state at the fixing point 1 and the fixing point 2 is good, and the low-voltage output fuse is intact. If when V _ SEN1 and V _ SEN2 are not equal, it indicates that there is a problem with the terminal connection status at fixed point 1 and fixed point 2, or that the low voltage output fuse is blown.
When V _ SEN2 and V _ KL30 are equal, it is said that the terminal connection state at the fixed point 2 is good. If V _ SEN2 and V _ KL30 are not equal, this indicates that there is a problem with the terminal connection state at the fixing point 2, or that there is a problem with the KL30 harness.
And the control circuit uploads the data to the vehicle controller or the vehicle body controller according to the judged fault state, and then the vehicle controller sends out an alarm signal or controls the vehicle-mounted display to display the fault.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (2)
1. The detection method of the output connection state detection circuit of the DCDC converter of the electric automobile comprises the following steps that the output end of the DCDC converter is connected with a fuse through a positive output wire harness, the fuse is connected with a 12V storage battery, and the detection method is characterized in that: the detection circuit also comprises a DCDC output voltage detection circuit, a first voltage detection circuit, a second voltage detection circuit and a storage battery output voltage detection circuit, wherein the DCDC voltage detection circuit is used for detecting the voltage of the output end of the DCDC converter, and the output end of the DCDC voltage detection circuit is connected with the control circuit; the first voltage detection circuit is used for detecting the voltage of one end of the fuse connected with the output wire harness, the other end of the fuse is detected by the second voltage detection circuit, the output ends of the first voltage detection circuit and the second voltage detection circuit are respectively connected with the input end of the control circuit, the storage battery output voltage detection circuit is used for detecting the voltage of two ends of a 12V storage battery, and the output end of the storage battery output voltage detection circuit is connected with the input end of the control circuit; the control circuit judges the connection state between the DCDC converter and the 12V storage battery according to the acquired voltage data; the DCDC output voltage detection circuit, the first voltage detection circuit, the second voltage detection circuit and the storage battery output voltage detection circuit respectively acquire corresponding voltage data in a resistance voltage division mode and send the voltage data to the control circuit; the control circuit is a control chip integrated in the DCDC converter; the DCDC output voltage detection circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is connected with the low-voltage output end of the DCDC converter, the other end of the resistor R2 is grounded, and an output terminal is led out from a connecting line between the resistors R1 and R2 and is connected with the input end of the control circuit; the first voltage detection circuit comprises resistors R3 and R4, one end of a positive output wire harness is connected with the positive electrode of the DCDC converter, the other end of the positive output wire harness is connected with a fuse, a voltage detection point is led out from the connection position of the positive output wire harness and is connected with one end of a resistor R3, the other end of the resistor R3 is grounded through a resistor R4, and an output terminal is led out from a connecting line between the resistors R3 and R4 and is connected with the input end of the control circuit; the second voltage detection circuit comprises resistors R5 and R6, the fuse is connected with a positive post wiring terminal of the storage battery, a wiring is led out from the connection position and connected with one end of a resistor R5, the other end of the resistor R5 is grounded through a resistor R6, and a wiring is led out between the resistors R5 and R6 and connected with the input end of the control circuit; the storage battery voltage detection circuit comprises resistors R7 and R8, the anode of the 12V storage battery is connected with one end of a resistor R7, the other end of the resistor R7 is grounded through a resistor R8, and a terminal is led out between the resistors R7 and R8 and connected with the input end of the control circuit;
the method comprises the following steps: the control circuit acquires voltage data of detection electricity between the output end of the DCDC converter and a 12V storage battery; wherein the collected voltage data includes: output voltage V _ofDCDC converter output endDCVoltage data V _atthe junction of the positive output harness and the fuseSEN1The voltage V _atthe junction of the fuse and the positive pole of the 12-cellSEN2And real-time voltage V _, at two ends of 12V accumulatorKL30；
The control circuit judges the output connection state of the DCDC converter according to the acquired voltage data:
when V \uDCAnd V \ uSEN1Pressure ofWhen the difference is less than or equal to a preset threshold value delta V2, the connection state between the positive output terminal of the DCDC converter and the positive output wiring harness and between the fuse and the positive pole of the 12V storage battery is good;
when V \uDCAnd V \ uSEN1When the voltage difference is larger than a preset threshold value delta V2, the connection state of the terminals between the positive output terminal of the DCDC converter and the wiring harness or the connection position of the fuse and the 12V storage battery is failed;
when V \uSEN1And V \ uSEN2When the voltage is equal, the connection state of the positive output wire harness and the terminal at the connection part of the fuse and the 12V storage battery is good, and the low-voltage output fuse is good; if when V \uSEN1And V \ uSEN2When the voltage is not equal, the connection state of the connection position of the positive output wire harness and the fuse and the terminal connection state of the connection position of the fuse and the 12V storage battery are in a problem, or the low-voltage output fuse is fused;
when V \uSEN2And V \ uKL30When the voltage is equal, the connection state of the terminal at the connection part of the fuse and the 12V storage battery is good; if V \uSEN2And V \ uKL30When they are not equal, it is described that there is a problem in the terminal connection state at the connection of the fuse and the 12V battery, or that there is a problem in the KL30 harness.
2. The detection method of the output connection state detection circuit of the DCDC converter of the electric vehicle according to claim 1, characterized in that: the preset threshold value delta V2 is V _KL30To VSEN1The maximum voltage difference Δ V2 due to the positive wire harness resistance and the contact resistance.
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