CN105137336A - Diagnostic circuit and diagnostic method for detecting electric vehicle high-voltage relay fault - Google Patents
Diagnostic circuit and diagnostic method for detecting electric vehicle high-voltage relay fault Download PDFInfo
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- CN105137336A CN105137336A CN201510456689.3A CN201510456689A CN105137336A CN 105137336 A CN105137336 A CN 105137336A CN 201510456689 A CN201510456689 A CN 201510456689A CN 105137336 A CN105137336 A CN 105137336A
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Abstract
The invention discloses a diagnostic circuit and a diagnostic method for detecting electric vehicle high-voltage relay fault. The circuit comprises a battery pack for providing power and a driving force for the electric vehicle and a controller for controlling on and off of an electric vehicle switch element. Two ends of the battery pack are connected with an overall electrical device; a main positive relay K+ is serially connected between the positive electrode of the battery pack and the overall electrical device; two ends of the main positive relay K+ are parallelly connected with a relay R and a pre-charging relay Kp; a main negative relay K- is serially connected between the negative electrode of the battery pack and the overall electrical device; both the battery pack and the overall electrical device are respectively connected with the controller; the controller is used for detecting voltage at two ends of the battery pack, voltage at two ends of the overall electrical device, and voltage at the negative end of the battery pack and the positive end of the overall electrical device. Thus, no peripheral circuit needs to be added, the state of the relay is judged only through carrying out cross detection on voltage at the relay end, whether the relay has a fault can be timely detected, remedial measures can be taken timely, the method is simple, convenient and feasible, and no detection risk is added.
Description
Technical field
The present invention relates to the diagnosis of electric automobile relay fault, particularly relate to the diagnostic circuit and diagnostic method that detect electric automobile high-voltage relay fault.
Background technology
Generally be divided into two kinds for the relay used in electric automobile high-voltage power-on and power-off at present, a kind of be self with feedback contact, another kind is without feedback contact.For band feedback contact is generally the virtual condition being judged relay by feedback signal, for the general virtual condition not judging relay not with feedback contact.And using the major defect of these relays and deficiency: the feedback signal of systems axiol-ogy relay is generally judged by the I/O port of CPU.And traditional testing circuit and method all need to detect electric current and voltage, comparatively complicated, and when adhesion fault being detected, possible accident has occurred, and cannot make remedial measures timely.
Summary of the invention
The object of the invention is to be to provide the diagnostic circuit and diagnostic method that detect electric automobile high-voltage relay fault, solve one or more in above-mentioned prior art problem.
According to an aspect of the present invention, the diagnostic circuit and diagnostic method that detect electric automobile high-voltage relay fault are provided, comprise for electric automobile provides the electric battery of power supply and power and the controller of control electric automobile on-off element break-make, electric battery is provided with positive pole and negative pole, the two ends of electric battery are connected with car load electrical equipment, to have connected between battery anode and car load electrical equipment main positive relay K+, main positive relay K+the in parallel series circuit in two ends, this series circuit has resistance R and pre-charge-relay Kp to be composed in series; The negative pole of electric battery and main negative relay K of having connected between car load electrical equipment-; Detect interface with the IO of controller at the two ends of electric battery respectively with the two ends of car load electrical equipment to be connected, controller is for detecting the voltage of the voltage at electric battery two ends, the voltage at car load electrical equipment two ends and battery pack negative terminal and car load electrical equipment anode.
In some embodiments: described controller is single-chip microcomputer.Thus can voltage on testing circuit.
Diagnostic method according to the diagnostic circuit detecting electric automobile high-voltage relay fault is provided in addition, comprises the following steps:
Step 1: check K+, the voltage that single-chip microcomputer records electric battery two ends is V1, and the voltage recording battery pack negative terminal and car load electrical equipment anode is V2, and the voltage recording car load electrical equipment two ends is V3, if V1-V2=0, then K+ is adhesion fault; If V1-V2 ≠ 0, then K+ adhesion;
Step 2: precharge, closed Kp, if V3 rises rapidly, side K-is adhesion fault; If V3 does not change, then K-adhesion, now closes K-again, carries out precharge.
Step 3: power on, when precharge completes, closed K+, disconnect Kp, complete and power on, electric battery can to car load power electrical apparatus.
Step 4: lower electricity, first disconnects K+, if now V2 ≠ 0 remaining unchanged, then Kp is adhesion fault; Otherwise Kp is adhesion, then disconnects K-, complete lower electricity.
The present invention does not need to add peripheral circuit, only judges relay status to the cross detection of relay end voltage, and relay whether fault can be detected in time, be convenient to adopt remedial measures in time, method is simple and feasible, does not increase detection risk again.
Accompanying drawing explanation
Fig. 1 is the diagnostic circuit schematic diagram that the present invention detects electric automobile high-voltage relay fault;
Fig. 2 is the process flow diagram that the present invention detects the diagnostic method of electric automobile relay fault.
Embodiment
Illustrate below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, detect the diagnostic circuit of electric automobile high-voltage relay fault, comprise for electric automobile provides the electric battery of power supply and power and the controller of control electric automobile relay on-off, electric battery is made up of multiple serial battery, electric battery is provided with positive pole and negative pole, the two ends of electric battery are connected with car load electrical equipment, and for car load electrical equipment provides power supply and kinetic energy, wherein car load electrical equipment comprises electric capacity and electrical equipment.
Connected between battery anode and car load electrical equipment a positive relay K of the master for control circuit break-make+, simultaneously main positive relay K+two ends one group of series circuit in parallel, this series electrical routing resistance R and being composed in series for the pre-charge-relay Kp of control circuit break-make.Negative pole and the master that connected between car load electrical equipment of electric battery bear relay K-.
Detect interface with the IO of controller at the two ends of the positive and negative electrode of electric battery respectively with the two ends of car load electrical equipment to be connected, controller detects electric battery both end voltage, the car load electricity voltage at equipment two ends and the voltage of battery pack negative terminal and car load electrical equipment anode by CAN real-time reception, and makes corresponding operational order according to the magnitude of voltage detected.
Wherein, controller is single-chip microcomputer.The voltage that controller detects electric battery two ends is V1, and the voltage that controller detects battery pack negative terminal and car load electrical equipment anode is V2, and the voltage that controller detects car load electrical equipment two ends is V3.
In addition, as shown in Figure 2, based on the diagnostic method of the diagnostic circuit of detection electric automobile high-voltage relay fault, comprise the following steps,
Step 1: check K+, the voltage that single-chip microcomputer records electric battery two ends is V1, and the voltage recording battery pack negative terminal and car load electrical equipment anode is V2, and the voltage recording car load electrical equipment two ends is V3.If now V1-V2=0, then K+ is adhesion fault.If V1-V2 ≠ 0, then K+ adhesion.
Thus, before powering on, K+, K-can be investigated one by one and whether be in adhesion fault, if break down, can place under repair in time, dangerous generation can not be caused.
Step 2: precharge, closed Kp, if V3 rises rapidly, side K-is adhesion fault.If V3 does not change, that is V3=0, or the electric capacity in car load electrical equipment has electric power to remain, and V3 keeps certain magnitude of voltage constant, then K-adhesion, and now close K-again, carry out precharge, when pre-charge voltage reaches the ratio of regulation, precharge completes.
Step 3: power on, closed K+, disconnect Kp, complete and power on, electric battery can to car load power electrical apparatus.
Step 4: lower electricity, first disconnects K+, if now V2 ≠ 0 remaining unchanged, then Kp is adhesion fault; Otherwise Kp is adhesion, now V2=0, then disconnects K-, complete lower electricity.。
In sum, the present invention does not need to add peripheral circuit, only judges relay status to the cross detection of relay end voltage, and relay whether fault can be detected in time, be convenient to adopt remedial measures in time, method is simple and feasible, does not increase detection risk again.
The above is only one embodiment of the present invention; it should be pointed out that to those skilled in the art, without departing from the concept of the premise of the invention; can also make some similar distortion and improvement, these also should be considered as within protection scope of the present invention.
Claims (3)
1. detect the diagnostic circuit of electric automobile high-voltage relay fault, it is characterized in that: comprise for electric automobile provides the electric battery of power supply and power and the controller of control electric automobile on-off element break-make, electric battery is provided with positive pole and negative pole, the two ends of electric battery are connected with car load electrical equipment, to have connected between battery anode and car load electrical equipment main positive relay K+, main positive relay K+the in parallel series circuit in two ends, this series circuit has resistance R and pre-charge-relay Kp to be composed in series; The negative pole of electric battery and main negative relay K of having connected between car load electrical equipment-; Detect interface with the IO of controller at the two ends of electric battery respectively with the two ends of car load electrical equipment to be connected, described controller is for detecting the voltage of the voltage at electric battery two ends, the voltage at car load electrical equipment two ends and battery pack negative terminal and car load electrical equipment anode.
2. the diagnostic circuit detecting electric automobile high-voltage relay fault as claimed in claim 1, is characterized in that: described controller is single-chip microcomputer.
3. use the diagnostic method of the diagnostic circuit of the detection electric automobile high-voltage relay fault described in claim 1 or 2, it is characterized in that: comprise the following steps,
Step 1: check K+, the voltage that single-chip microcomputer records electric battery two ends is V1, and the voltage recording battery pack negative terminal and car load electrical equipment anode is V2, and the voltage recording car load electrical equipment two ends is V3, if V1-V2=0, then K+ is adhesion fault; If V1-V2 ≠ 0, then K+ adhesion;
Step 2: precharge, closed Kp, if V3 rises rapidly, side K-is adhesion fault; If V3 does not change, then K-adhesion, now closes K-again, carries out precharge;
Step 3: power on, when precharge completes, closed K+, disconnect Kp, complete and power on, electric battery can to car load power electrical apparatus;
Step 4: lower electricity, first disconnects K+, if now V2 ≠ 0 remaining unchanged, then Kp is adhesion fault; Otherwise Kp is adhesion, then disconnects K-, complete lower electricity.
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| CN201510456689.3A CN105137336B (en) | 2015-07-29 | 2015-07-29 | Detect the diagnostic method of electric automobile high-voltage relay failure |
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Effective date of registration: 20201117 Address after: 226300 west side of Dalian Road, Nantong high tech Zone, Nantong, Jiangsu Patentee after: Jiangsu Bo Wo automobile electronic system Co.,Ltd. Address before: 226000 Jiangsu Province, Nantong City Chongchuan District sik Road No. 9 Patentee before: NANTONG University |