CN106564382B - The high-pressure-loop interlock system and its control method of new-energy automobile - Google Patents
The high-pressure-loop interlock system and its control method of new-energy automobile Download PDFInfo
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- CN106564382B CN106564382B CN201610858684.8A CN201610858684A CN106564382B CN 106564382 B CN106564382 B CN 106564382B CN 201610858684 A CN201610858684 A CN 201610858684A CN 106564382 B CN106564382 B CN 106564382B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Abstract
The invention discloses the high-pressure-loop interlock systems and its control method of a kind of new-energy automobile, belong to electronic technology field.High-pressure-loop interlock system includes: detection circuit and CAN circuit；For each high voltage component, the input terminal and output end of high voltage component are connected with detection circuit one end respectively, and the other end of detection circuit is connected with one end of CAN circuit, and the other end of CAN circuit is connected with the CAN bus of new-energy automobile；Detection circuit is used to receive the second loop interlocking signal of the output end output of the first loop interlocking signal and high voltage component of the input terminal output of high voltage component, the first loop interlocking signal and the second loop interlocking signal are converted into the first level signal and second electrical level signal respectively, according to the first level signal and second electrical level signal, the interlocking state for determining high voltage component, interlocking state is exported to CAN circuit；CAN circuit is used for the interlocking state of receiving test circuit output, and interlocking state is output to CAN bus.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a high-voltage loop interlocking system of a new energy automobile and a control method of the high-voltage loop interlocking system.
Background
In order to improve the driving performance of new energy vehicles, the battery voltage used by the new energy vehicles is also higher and higher. With the increase of the battery voltage, the requirements of national and local laws and regulations on the safety protection of new energy automobiles are continuously increased; if a high-voltage component in the new energy automobile breaks down, a high-voltage danger is generated; therefore, whether a high-voltage component of the new energy automobile has a fault needs to be detected through a high-voltage loop interlocking system of the new energy automobile.
In the prior art, high-voltage component interlocking terminals of all high-voltage components in a new energy automobile are connected in series to form a high-voltage loop interlocking system, and one high-voltage component is selected from the high-voltage loop interlocking system; when the new energy automobile is started, the selected high-voltage component is set to periodically trigger a loop interlocking signal, and the loop interlocking signal is output to the last high-voltage component in the high-voltage loop interlocking system along the clockwise direction or the anticlockwise direction; the acquisition circuit of the last high-voltage component detects whether the loop interlocking signal is abnormal; and if the loop interlocking signal is abnormal, determining that a high-voltage component in the high-voltage loop interlocking system has a fault.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
in the prior art, only the fault of a high-voltage component in a new energy automobile can be detected, but the specific fault of the high-voltage component cannot be detected; therefore, the prior art cannot lock the fault position.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-voltage loop interlocking system of a new energy automobile and a control method thereof. The technical scheme is as follows:
in a first aspect, the present invention provides a high voltage loop interlock system for a new energy vehicle, where the high voltage loop interlock system includes: the detection circuit and the controller area network CAN circuit;
for each high-voltage component in the new energy automobile, the input end and the output end of the high-voltage component are respectively connected with one end of the detection circuit, the other end of the detection circuit is connected with one end of the CAN circuit, and the other end of the CAN circuit is connected with a CAN bus of the new energy automobile;
the detection circuit is used for receiving a first loop interlocking signal output by an input end of the high-voltage component and a second loop interlocking signal output by an output end of the high-voltage component, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, determining an interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the CAN circuit;
the CAN circuit is used for receiving the interlocking state output by the detection circuit and outputting the interlocking state to the CAN bus.
In one possible design, the detection circuit includes a first processing circuit and a first master control circuit;
one end of the first processing circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the first processing circuit is connected with one end of the first main control circuit, and the other end of the first main control circuit is connected with one end of the CAN circuit;
the first processing circuit is used for receiving the first loop interlocking signal and the second loop interlocking signal, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the first main control circuit;
the first master control circuit is used for receiving the interlocking state output by the first processing circuit and outputting the interlocking signal to the CAN circuit.
In another possible design, the first processing circuit includes an interlock signal processing unit and a first logic signal processing unit;
one end of the interlocking signal processing unit is connected with the input end and the output end of the high-voltage component respectively, the other end of the interlocking signal processing unit is connected with one end of the first logic signal processing unit, and the other end of the first logic signal processing unit is connected with one end of the first main control circuit;
the interlock signal processing unit is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into the first level signal and the second level signal, respectively, and output the first level signal and the second level signal to the first logic signal processing unit;
the first logic signal processing unit is configured to receive the first level signal and the second level signal output by the interlock signal unit, determine an interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the first main control circuit.
In another possible design, the detection circuit includes a second processing circuit and a second master control circuit;
one end of the second processing circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the second processing circuit is connected with one end of the second main control circuit, and the other end of the second main control circuit is connected with one end of the CAN circuit;
the second processing circuit is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, and output the first level signal and the second level signal to the second master control circuit;
the second main control circuit is used for receiving the first level signal and the second level signal output by the second processing circuit, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the CAN circuit.
In another possible design, the second master control circuit includes a second logic signal processing unit and a master control unit;
one end of the second logic signal processing unit is connected with one end of the second processing circuit, the other end of the second logic signal processing unit is connected with one end of the main control unit, and the other end of the main control unit is connected with one end of the CAN circuit;
the second logic signal processing unit is configured to receive the first level signal and the second level signal output by the second processing circuit, determine an interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the main control unit;
the main control unit is used for receiving the interlocking state output by the second logic signal processing unit and outputting the interlocking state to the CAN circuit.
In a second aspect, an embodiment of the present invention provides a control method for a high-voltage loop interlock system of a new energy vehicle, where the method includes:
for each high-voltage component in a new energy automobile, receiving a first loop interlocking signal output by an input end of the high-voltage component and a second loop interlocking signal output by an output end of the high-voltage component;
converting the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively;
and determining the interlocking state of the high-voltage component according to the first level signal and the second level signal.
In one possible design, the determining the interlock state of the high-voltage component according to the first level signal and the second level signal includes:
determining whether the first level signal and the second level signal are the same, and if the first level signal and the second level signal are the same, determining that the interlocking state of the high-voltage component is a closed state; and if the first level signal and the second level signal are not the same, determining that the interlocking state of the high-voltage component is an open state.
In another possible design, the determining the interlock state of the high-voltage component according to the first level signal and the second level signal includes:
calculating a NAND result between the first level signal and the second level signal by a NAND algorithm;
if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state;
and if the NAND result is high level, determining that the interlocking state of the high-voltage component is an open state.
In another possible design, the method further includes:
and if the interlocking state of the high-voltage component is in an open state, the output main relay of the high-voltage component is disconnected, and an alarm is given.
In another possible design, the method further includes:
and acquiring a component identifier of the high-voltage component, and establishing a corresponding relation between the component identifier and the interlocking state.
In the embodiment of the invention, for each high-voltage component in the new energy automobile, the high-voltage component is connected with a high-voltage loop interlocking system in series, the interlocking state of the high-voltage component is detected through the high-voltage loop interlocking system, and whether the high-voltage component has a fault or not is determined according to the interlocking state; thereby improving the accuracy of detecting whether the high-voltage component is out of order.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage loop interlock system of a new energy vehicle according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a control method of a high-voltage loop interlock system of a new energy vehicle according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of a high-voltage loop interlock system of a new energy vehicle according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a high-voltage loop interlock system of another new energy vehicle according to embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a high-voltage loop interlock system of another new energy vehicle according to embodiment 3 of the present invention;
fig. 6 is a schematic structural diagram of a high-voltage loop interlock system of another new energy vehicle according to embodiment 3 of the present invention;
fig. 7 is a flowchart of a control method of a high-voltage loop interlock system of a new energy vehicle according to embodiment 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
At present, high-voltage component interlocking terminals of all high-voltage components in a new energy automobile are connected in series to form a high-voltage loop interlocking system, and a loop interlocking signal is triggered through one high-voltage component interlocking terminal in the high-voltage loop interlocking system to detect whether a high-voltage component in the high-voltage loop interlocking system has a fault or not; therefore, only the high-voltage components in the new energy automobile can be detected to be out of order, but specific high-voltage components cannot be detected to be out of order, and the detection accuracy is low.
In the embodiment of the invention, for each high-voltage component in the new energy automobile, the high-voltage component is connected with a high-voltage loop interlocking system in series, the interlocking state of the high-voltage component is detected through the high-voltage loop interlocking system, and whether the high-voltage component has a fault or not is determined according to the interlocking state; thereby improving the accuracy of detecting whether the high-voltage component is out of order.
Example 1
An embodiment of the present invention provides a high-voltage loop interlock system of a new energy vehicle, and referring to fig. 1, the high-voltage loop interlock system includes a detection circuit 101 and a CAN (Controller Area Network) circuit 102.
The input end and the output end of a high-voltage component in the new energy automobile are respectively connected with one end of a detection circuit 101, the other end of the detection circuit 101 is connected with one end of a CAN circuit 102, and the other end of the CAN circuit 102 is connected with a CAN bus of the new energy automobile;
the detection circuit 101 is configured to receive a first loop interlock signal output by an input end of the high-voltage component and a second loop interlock signal output by an output end of the high-voltage component, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, determine an interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the CAN circuit 102;
the CAN circuit 102 is configured to receive the interlock state output by the detection circuit 101 and output the interlock state to the CAN bus.
Optionally, the detection circuit 101 includes a first processing circuit and a first main control circuit;
one end of the first processing circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the first processing circuit is connected with one end of the first main control circuit, and the other end of the first main control circuit is connected with one end of the CAN circuit 102;
the first processing circuit is used for receiving the first loop interlocking signal and the second loop interlocking signal, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the first main control circuit;
the first master control circuit is configured to receive the interlock status output by the first processing circuit and output an interlock signal to the CAN circuit 102.
Optionally, the first processing circuit includes an interlock signal processing unit and a first logic signal processing unit;
one end of the interlocking signal processing unit is respectively connected with the input end and the output end of the high-voltage component, the other end of the interlocking signal processing unit is connected with one end of the first logic signal processing unit, and the other end of the first logic signal processing unit is connected with one end of the first main control circuit;
the interlocking signal processing unit is used for receiving the first loop interlocking signal and the second loop interlocking signal, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, and outputting the first level signal and the second level signal to the first logic signal processing unit;
the first logic signal processing unit is used for receiving the first level signal and the second level signal output by the interlocking signal unit, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the first main control circuit.
Optionally, the detection circuit 101 includes a second processing circuit and a second main control circuit;
one end of the second processing circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the second processing circuit is connected with one end of the second main control circuit, and the other end of the second main control circuit is connected with one end of the CAN circuit 102;
the second processing circuit is used for receiving the first loop interlocking signal and the second loop interlocking signal, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, and outputting the first level signal and the second level signal to the second main control circuit;
the second main control circuit is configured to receive the first level signal and the second level signal output by the second processing circuit, determine the interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the CAN circuit 102.
Optionally, the second main control circuit includes a second logic signal processing unit and a main control unit;
one end of the second logic signal processing unit is connected with one end of the second processing circuit, the other end of the second logic signal processing unit is connected with one end of the main control unit, and the other end of the main control unit is connected with one end of the CAN circuit 102;
the second logic signal processing unit is used for receiving the first level signal and the second level signal output by the second processing circuit, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the main control unit;
the main control unit is configured to receive the interlock state output by the second logic signal processing unit, and output the interlock state to the CAN circuit 102.
In the embodiment of the invention, for each high-voltage component in the new energy automobile, the high-voltage component is connected with a high-voltage loop interlocking system in series, the interlocking state of the high-voltage component is detected through the high-voltage loop interlocking system, and whether the high-voltage component has a fault or not is determined according to the interlocking state; thereby improving the accuracy of detecting whether the high-voltage component is out of order.
Example 2
The embodiment of the invention provides a control method of a high-voltage loop interlocking system of a new energy automobile, and referring to fig. 2, the method comprises the following steps:
step 201: for each high-voltage component in the new energy automobile, a first loop interlocking signal output by an input end of the high-voltage component and a second loop interlocking signal output by an output end of the high-voltage component are received.
Step 202: the first loop interlock signal and the second loop interlock signal are converted into a first level signal and a second level signal, respectively.
Step 203: and determining the interlocking state of the high-voltage component according to the first level signal and the second level signal.
Optionally, determining the interlock state of the high-voltage component according to the first level signal and the second level signal includes:
determining whether the first level signal and the second level signal are the same, and if the first level signal and the second level signal are the same, determining that the interlocking state of the high-voltage component is a closed state; and if the first level signal and the second level signal are not the same, determining that the interlocking state of the high-voltage component is an open state.
Optionally, determining the interlock state of the high-voltage component according to the first level signal and the second level signal includes:
calculating a nand result between the first level signal and the second level signal by a nand algorithm;
if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state;
if the NAND result is a high level, the interlock state of the high-voltage component is determined to be an open state.
Optionally, the method further comprises:
if the interlocking state of the high-voltage component is in an open state, the output main relay of the high-voltage component is disconnected, and an alarm is given.
Optionally, the method further comprises:
and acquiring the component identifier of the high-voltage component, and establishing the corresponding relation between the component identifier and the interlocking state.
In the embodiment of the invention, for each high-voltage component in the new energy automobile, the high-voltage component is connected with a high-voltage loop interlocking system in series, the interlocking state of the high-voltage component is detected through the high-voltage loop interlocking system, and whether the high-voltage component has a fault or not is determined according to the interlocking state; thereby improving the accuracy of detecting whether the high-voltage component is out of order.
Example 3
The embodiment of the invention provides a high-voltage loop interlocking system of a new energy automobile, which comprises a detection circuit 101 and a CAN circuit 102.
The input end and the output end of a high-voltage component in the new energy automobile are respectively connected with one end of a detection circuit 101, the other end of the detection circuit 101 is connected with one end of a CAN circuit 102, and the other end of the CAN circuit 102 is connected with a CAN bus of the new energy automobile.
The detection circuit 101 is configured to receive a first loop interlock signal output by an input terminal of the high-voltage component and a second loop interlock signal output by an output terminal of the high-voltage component, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively, determine an interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the CAN circuit 102.
The detection circuit 101 determines whether the first level signal and the second level signal are the same; if the first level signal is the same as the second level signal, determining that the interlocking state of the high-voltage component is a closed state; and if the first level signal and the second level signal are not the same, determining that the interlocking state of the high-voltage component is an open state. Or,
the detection circuit 101 calculates a nand result between the first level signal and the second level signal by a nand algorithm; if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state; if the NAND result is a high level, the interlock state of the high-voltage component is determined to be an open state.
The first loop interlock signal may be a 12V level signal or a 12V pulse width modulated signal. It should be noted that, the first loop interlock signal is a pulse width modulation signal, the pulse width modulation signal is a square wave signal, and compared with a high level signal or a low level signal in the prior art, the pulse width modulation signal has the advantages that the short circuit of the pulse width modulation signal to the new energy vehicle ground or the high power supply can be effectively diagnosed by detecting the voltage and the frequency of the pulse width modulation signal, and the situation that the interlock function of the detection circuit 101 is falsely triggered due to the misjudgment of the signal abnormality is avoided.
The high-voltage component is connected with the detection circuit 101 through an interlocking terminal and is connected with a whole vehicle control circuit of the new energy vehicle through a low-voltage plug-in. That is, one end of the interlock terminal of the high-voltage component is connected to the input terminal (HVIL _ IN) of the low-voltage package and one end of the detection circuit 101, respectively, and the other end of the interlock terminal of the high-voltage component is connected to the output terminal (HVIL _ OUT) of the low-voltage package and one end of the detection circuit 101, respectively.
The CAN circuit 102 is configured to receive the interlock state output by the detection circuit 101 and output the interlock state to the CAN bus.
The whole vehicle control circuit sends a first loop interlocking signal, and the first loop interlocking signal passes through the input ends of the interlocking terminals of the low-voltage plug-in and the high-voltage component and is output to the detection circuit 101.
The CAN circuit 102 is formed of a CAN signal level conversion circuit, and transmits the interlock state output from the detection circuit 101 to the CAN bus.
In the embodiment of the invention, the CAN circuit outputs the interlocking state of the high-voltage component to the CAN bus, thereby realizing the purpose of real-time monitoring.
Referring to fig. 3, the detection circuit 101 includes a first processing circuit 1011 and a first master control circuit 1012.
One end of the first processing circuit 1011 is connected to the input end and the output end of the high-voltage component, respectively, the other end of the first processing circuit 1011 is connected to one end of the first main control circuit 1012, and the other end of the first main control circuit 1012 is connected to one end of the CAN circuit 102;
the first processing circuit 1011 is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively, determine the interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the first main control circuit 1012;
the first master control circuit 1012 is configured to receive the interlock status output by the first processing circuit 1011 and output an interlock signal to the CAN circuit 102.
The first main control circuit 1012 may be a main control chip; the main control chip CAN be composed of an MCU (micro controller Unit) operation chip, and CAN also be composed of a DSP (digital signal Processing) operation chip, and CAN monitor and identify the interlocking state and output the interlocking state to the CAN bus through the CAN interface.
Referring to fig. 4, the first processing circuit 1011 includes an interlock signal processing unit 10111 and a first logic signal processing unit 10112;
one end of the interlocking signal processing unit 10111 is connected to the input end and the output end of the high voltage component, respectively, the other end of the interlocking signal processing unit 10111 is connected to one end of the first logic signal processing unit 10112, and the other end of the first logic signal processing unit 10112 is connected to one end of the first main control circuit 1012;
the interlock signal processing unit 10111 is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively, and output the first level signal and the second level signal to the first logic signal processing unit 10112;
the first logic signal processing unit 10112 is configured to receive the first level signal and the second level signal output by the interlock signal unit, determine the interlock status of the high-voltage component according to the first level signal and the second level signal, and output the interlock status to the first main control circuit 1012.
The interlocking signal processing unit 10111 comprises a resistance voltage division circuit, a filter capacitor and an operational amplifier; one end of the resistance voltage division circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the resistance voltage division circuit is connected with one end of the filter capacitor, the other end of the filter capacitor is connected with one end of the operational amplifier, and the other end of the operational amplifier is connected with one end of the first logic signal processing unit 10112. The first logic signal processing unit 10112 may be constituted by a nand logic gate circuit.
Referring to fig. 5, the detection circuit 101 includes a second processing circuit 1013 and a second master control circuit 1014;
one end of the second processing circuit 1013 is connected to the input end and the output end of the high-voltage component, the other end of the second processing circuit 1013 is connected to one end of the second main control circuit 1014, and the other end of the second main control circuit 1014 is connected to one end of the CAN circuit 102;
the second processing circuit 1013 is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively, and output the first level signal and the second level signal to the second main control circuit 1014;
the second master control circuit 1014 is configured to receive the first level signal and the second level signal output by the second processing circuit 1013, determine the interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the CAN circuit 102.
The second processing circuit 1013 is generally formed of a resistor and a capacitor, and is extremely low in cost. The second master control circuit 1014 may be a master control chip; the main control chip CAN be composed of an MCU (micro controller Unit) operation chip, and CAN also be composed of a DSP (Digital Signal Processing) operation chip, and CAN monitor and identify the interlocking state and output the interlocking state to the CAN bus through the CAN interface.
Referring to fig. 6, the second main control circuit 1014 includes a second logic signal processing unit 10141 and a main control unit 10142;
one end of the second logic signal processing unit 10141 is connected to one end of the second processing circuit 1013, the other end of the second logic signal processing unit 10141 is connected to one end of the main control unit 10142, and the other end of the main control unit 10142 is connected to one end of the CAN circuit 102;
the second logic signal processing unit 10141 is configured to receive the first level signal and the second level signal output by the second processing circuit 1013, determine the interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the main control unit 10142;
the main control unit 10142 is configured to receive the interlock status output by the second logic signal processing unit 10141, and output the interlock status to the CAN circuit 102.
The second logic signal processing unit 10141 may be formed by a nand logic gate circuit, or may be processed and operated by a main control chip.
In the embodiment of the present invention, the second logic signal processing unit 10141 is integrated into the second main control circuit 1014, that is, the second logic signal processing circuit can be replaced by the main control circuit, so that the new cost is very low.
Similarly, the second processing circuit 1013 is generally formed of a resistor and a capacitor, and is extremely low in cost.
In the embodiment of the invention, for each high-voltage component in the new energy automobile, the high-voltage component is connected with a high-voltage loop interlocking system in series, the interlocking state of the high-voltage component is detected through the high-voltage loop interlocking system, and whether the high-voltage component has a fault or not is determined according to the interlocking state; thereby improving the accuracy of detecting whether the high-voltage component is out of order.
Example 4
The embodiment of the invention provides a control method of a high-voltage loop interlocking system of a new energy automobile, and the control method is shown in fig. 7; the method comprises the following steps:
step 301: for each high-voltage component in the new energy automobile, the detection circuit receives a first loop interlocking signal output by the input end of the high-voltage component and a second loop interlocking signal output by the output end of the high-voltage component.
Step 302: the detection circuit converts the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively.
The detection circuit converts the first loop interlock signal into a first level signal and converts the second loop interlock signal into a second level signal.
Step 303: the detection circuit determines the interlock state of the high-voltage component based on the first level signal and the second level signal.
This step can be implemented in the following first manner or second manner; for the first implementation, the step may be:
the detection circuit determines whether the first level signal and the second level signal are the same; if the first level signal is the same as the second level signal, determining that the interlocking state of the high-voltage component is a closed state; and if the first level signal and the second level signal are not the same, determining that the interlocking state of the high-voltage component is an open state.
For the second implementation, the step may be:
the detection circuit calculates a NAND result between the first level signal and the second level signal through a NAND algorithm; if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state; if the NAND result is a high level, the interlock state of the high-voltage component is determined to be an open state.
The detection circuit outputs the interlocking state of the high-voltage component to the CAN circuit; the CAN circuit receives the interlock status output by the detection circuit and executes step 304.
Step 304: if the interlocking state of the high-voltage component is an open state, the CAN circuit opens the output main relay of the high-voltage component and gives an alarm.
The CAN circuit CAN alarm by sending alarm information, playing voice information or lighting a fault lamp and the like. For example, the process of the CAN circuit lighting the fault lamp to alarm may be: the CAN circuit informs the new energy automobile controller through a CAN bus of the new energy automobile, and the new energy automobile controller lights a fault lamp corresponding to the high-voltage component. Therefore, when the driver sees that the fault lamp corresponding to the high-voltage component is lighted, the driver overhauls the high-voltage component.
Step 305: the CAN circuit acquires the component identification of the high-voltage component, and establishes the corresponding relation between the component identification and the interlocking state.
The CAN circuit establishes the corresponding relation between the component identification and the interlocking state so as to carry out quality evaluation on the high-voltage component subsequently.
Further, the CAN circuit counts the fault frequency of the high-voltage component within a preset time length nearest to the current time, and the reliability of the high-voltage component is evaluated according to the fault frequency.
When the CAN circuit determines that the fault frequency is greater than the preset frequency, the reliability of the high-voltage component is determined to be poor; and when the failure frequency is determined to be not more than the preset frequency, determining that the reliability of the high-voltage component is strong.
The component identification of the high voltage component may be the name of the high voltage component or the like. The preset time length and the preset times can be set and changed according to needs, and in the embodiment of the invention, the preset time length and the preset times are not specifically limited; for example, the preset time period may be 1 month, 2 months, or the like; the preset number of times may be 10 times, etc.
In the embodiment of the invention, for each high-voltage component in the new energy automobile, the high-voltage component is connected with a high-voltage loop interlocking system in series, the interlocking state of the high-voltage component is detected through the high-voltage loop interlocking system, and whether the high-voltage component has a fault or not is determined according to the interlocking state; thereby improving the accuracy of detecting whether the high-voltage component is out of order.
It should be noted that: in the high-voltage loop interlocking system of the new energy vehicle provided in the above embodiment, when the high-voltage loops of the new energy vehicle are interlocked, only the division of the above functional modules is used for illustration, and in practical application, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the above described functions. In addition, the control method embodiment of the high-voltage loop interlocking system of the new energy vehicle and the control method embodiment of the high-voltage loop interlocking system of the new energy vehicle provided by the embodiment belong to the same concept, and the specific implementation process is described in the method embodiment and is not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A high-voltage loop interlocking system of a new energy automobile is characterized by comprising: the detection circuit and the controller area network CAN circuit;
for each high-voltage component in the new energy automobile, the input end and the output end of the high-voltage component are respectively connected with one end of the detection circuit, the other end of the detection circuit is connected with one end of the CAN circuit, and the other end of the CAN circuit is connected with a CAN bus of the new energy automobile;
the detection circuit is used for receiving a first loop interlocking signal output by an input end of the high-voltage component and a second loop interlocking signal output by an output end of the high-voltage component, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, determining an interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the CAN circuit;
the detection circuit calculates a NAND result between the first level signal and the second level signal through a NAND algorithm; if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state; if the NAND result is high level, determining that the interlocking state of the high-voltage component is an open state;
the CAN circuit is used for receiving the interlocking state output by the detection circuit and outputting the interlocking state to the CAN bus,
the first loop interlock signal is a pulse width modulation signal;
the detection circuit comprises a first processing circuit and a first main control circuit;
one end of the first processing circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the first processing circuit is connected with one end of the first main control circuit, and the other end of the first main control circuit is connected with one end of the CAN circuit;
the first processing circuit is used for receiving the first loop interlocking signal and the second loop interlocking signal, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the first main control circuit;
the first master control circuit is used for receiving the interlocking state output by the first processing circuit and outputting the interlocking state to the CAN circuit;
the first main control circuit is a main control chip, and the main control chip is a DSP operation chip;
the first processing circuit comprises an interlocking signal processing unit and a first logic signal processing unit;
one end of the interlocking signal processing unit is connected with the input end and the output end of the high-voltage component respectively, the other end of the interlocking signal processing unit is connected with one end of the first logic signal processing unit, and the other end of the first logic signal processing unit is connected with one end of the first main control circuit;
the interlock signal processing unit is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into the first level signal and the second level signal, respectively, and output the first level signal and the second level signal to the first logic signal processing unit;
the first logic signal processing unit is used for receiving the first level signal and the second level signal output by the interlocking signal processing unit, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the first main control circuit;
the interlocking signal processing unit comprises a resistance voltage division circuit, a filter capacitor and an operational amplifier; one end of the resistance voltage division circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the resistance voltage division circuit is connected with one end of the filter capacitor, the other end of the filter capacitor is connected with one end of the operational amplifier, and the other end of the operational amplifier is connected with one end of the first logic signal processing unit;
the first logic signal processing unit is composed of a NAND logic gate circuit.
2. A high-voltage loop interlocking system of a new energy automobile is characterized by comprising: the detection circuit and the controller area network CAN circuit;
for each high-voltage component in the new energy automobile, the input end and the output end of the high-voltage component are respectively connected with one end of the detection circuit, the other end of the detection circuit is connected with one end of the CAN circuit, and the other end of the CAN circuit is connected with a CAN bus of the new energy automobile;
the detection circuit is used for receiving a first loop interlocking signal output by an input end of the high-voltage component and a second loop interlocking signal output by an output end of the high-voltage component, respectively converting the first loop interlocking signal and the second loop interlocking signal into a first level signal and a second level signal, determining an interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the CAN circuit;
the detection circuit calculates a NAND result between the first level signal and the second level signal through a NAND algorithm; if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state; if the NAND result is high level, determining that the interlocking state of the high-voltage component is an open state;
the CAN circuit is used for receiving the interlocking state output by the detection circuit and outputting the interlocking state to the CAN bus;
the first loop interlock signal is a pulse width modulation signal;
the detection circuit comprises a second processing circuit and a second main control circuit;
one end of the second processing circuit is connected with the input end and the output end of the high-voltage component respectively, the other end of the second processing circuit is connected with one end of the second main control circuit, and the other end of the second main control circuit is connected with one end of the CAN circuit;
the second processing circuit is configured to receive the first loop interlock signal and the second loop interlock signal, convert the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, and output the first level signal and the second level signal to the second master control circuit;
the second main control circuit is used for receiving the first level signal and the second level signal output by the second processing circuit, determining the interlocking state of the high-voltage component according to the first level signal and the second level signal, and outputting the interlocking state to the CAN circuit;
the second main control circuit comprises a second logic signal processing unit and a main control unit;
one end of the second logic signal processing unit is connected with one end of the second processing circuit, the other end of the second logic signal processing unit is connected with one end of the main control unit, and the other end of the main control unit is connected with one end of the CAN circuit;
the second logic signal processing unit is configured to receive the first level signal and the second level signal output by the second processing circuit, determine an interlock state of the high-voltage component according to the first level signal and the second level signal, and output the interlock state to the main control unit; the second logic signal processing unit is integrated in the second master control circuit;
the main control unit is used for receiving the interlocking state output by the second logic signal processing unit and outputting the interlocking state to the CAN circuit;
the second main control circuit is a main control chip, and the main control chip is a DSP operation chip.
3. A method of controlling a high voltage loop interlock system according to claim 1 or 2, comprising:
for each high-voltage component in a new energy automobile, receiving a first loop interlocking signal output by an input end of the high-voltage component and a second loop interlocking signal output by an output end of the high-voltage component, wherein the first loop interlocking signal is a pulse width modulation signal;
converting the first loop interlock signal and the second loop interlock signal into a first level signal and a second level signal, respectively;
determining an interlock state of the high voltage component based on the first level signal and the second level signal,
the determining the interlock state of the high-voltage component according to the first level signal and the second level signal comprises:
calculating a NAND result between the first level signal and the second level signal by a NAND algorithm;
if the NAND result is low level, determining that the interlocking state of the high-voltage component is a closed state;
if the NAND result is high level, determining that the interlocking state of the high-voltage component is an open state;
the method further comprises the following steps: and acquiring a component identifier of the high-voltage component, and establishing a corresponding relation between the component identifier and the interlocking state.
4. The method of claim 3, wherein determining the interlock status of the high voltage component based on the first level signal and the second level signal comprises:
determining whether the first level signal and the second level signal are the same, and if the first level signal and the second level signal are the same, determining that the interlocking state of the high-voltage component is a closed state; and if the first level signal and the second level signal are not the same, determining that the interlocking state of the high-voltage component is an open state.
5. The method of claim 3, further comprising:
and if the interlocking state of the high-voltage component is in an open state, the output main relay of the high-voltage component is disconnected, and an alarm is given.
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| CN109100597A (en) * | 2018-10-18 | 2018-12-28 | 奇瑞新能源汽车技术有限公司 | A kind of high-pressure-loop interlock fault positioning circuit and localization method |
| CN111650541B (en) * | 2019-09-12 | 2022-08-26 | 摩登汽车有限公司 | Electric automobile high pressure interlocking detecting system and electric automobile |
| CN111038265A (en) * | 2019-12-30 | 2020-04-21 | 联合汽车电子有限公司 | High-voltage interlocking signal detection circuit and method and motor controller |
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