CN101718842A - Monitoring method and monitoring system for touch switch - Google Patents
Monitoring method and monitoring system for touch switch Download PDFInfo
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- CN101718842A CN101718842A CN200910241789A CN200910241789A CN101718842A CN 101718842 A CN101718842 A CN 101718842A CN 200910241789 A CN200910241789 A CN 200910241789A CN 200910241789 A CN200910241789 A CN 200910241789A CN 101718842 A CN101718842 A CN 101718842A
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Abstract
The invention provides a monitoring method and a monitoring system for a touch switch. The monitoring method comprises the following steps of: (1) during switching on the touch switch or switching off the touch switch, respectively measuring voltages of two ends of the touch switch relative to the same reference electrical level; (2) comparing the voltages of the two ends of the touch switch relative to the same reference electrical level; and (3) judging whether the touch switch is switched on or switched off normally or not according to a comparison result. By using the method and the device of the monitoring method and the monitoring system of the touch switch, the touch switch can be confirmed whether to be switched on normally or switched off normally through judging the voltages of the two ends of the touch switch relative to the same reference electrical level after the touch switch in a high voltage system of an elective vehicle receives a switching-on command or a switching-off command. The invention provides the effective and reliable monitoring method and the motoring system of the touch switch, thus the touch switch can be correctly judged whether to be switched on normally or switched off normally.
Description
Technical field
The present invention relates to a kind of monitoring method and system that is used for contact-making switch.
Background technology
Contact-making switch can be used for control circuit to switch on and off being connected between electrical load and the electrical source of power, is generally used for automation field, for example the electric automobile field.The block diagram of electric automobile high pressure using electricity system when Fig. 1 shows contact-making switch and is used for the electric automobile field.As shown in Figure 1, electric automobile high pressure using electricity system comprises high-tension battery bag 110 and consumer 120, is connected by contact-making switch between high-tension battery bag 110 and the consumer 120.
In use, when connecting contact-making switch,, then might cause the not normally closed situation of contact-making switch if correctly do not control contact-making switch.On the other hand, when disconnecting contact-making switch, high voltage direct current contact-making switch contact adhesion fault often takes place, the contact-making switch contact can't be disconnected.Especially if directly disconnect contact-making switch, then may produce the arcing phenomenon between two contacts of contact-making switch in charge and discharge mode following time when battery operated, cause high pressure contact-making switch on-load to disconnect, serious threat is to the safety of human pilot and overall vehicle.
The contact-making switch status monitoring of traditional electric automobile generally is to realize by the control signal of contact-making switch is monitored, specifically, (BMS) sends the contact-making switch control signal when battery management module, for example after close commands or the ON-and OFF-command, the control signal that contact-making switch receives is monitored, if the control signal that monitors is consistent with the control signal that BMS sends, thinks that then contact-making switch is normal, otherwise judge that then fault has appearred in contact-making switch.Yet this contact-making switch monitoring mode in particular cases can not correctly be monitored at some, for example, break down and cause contact-making switch can not responsive control signal the time when adhesion fault or contact-making switch connection line appear in the contact of contact-making switch, BMS can not correctly monitor the control signal that contact-making switch receives.
Summary of the invention
The objective of the invention is to solve in the present electric automobile can't to contact-making switch whether normally closed, disconnect the problem that makes accurate judgment, a kind of safe and reliable monitoring method that is used for contact-making switch and system are proposed.
The invention provides a kind of monitoring method that is used for contact-making switch, this method may further comprise the steps:
1) in the process of closed contact-making switch or disconnection contact-making switch, measures the voltage of described contact-making switch two ends respectively with respect to same datum;
2) more described contact-making switch two ends are with respect to the voltage of same datum;
3) judge described contact-making switch whether normally closed or disconnection according to comparative result.
The present invention also provides a kind of electric automobile contact-making switch monitoring system, and this system comprises R-T unit, measurement mechanism and control device, and described R-T unit is communicated by letter with described control device respectively with described measurement mechanism, wherein:
Described R-T unit is used to receive the close commands of contact-making switch or ON-and OFF-command and described close commands or ON-and OFF-command is sent to control device;
Described measurement mechanism is used for measuring respectively the voltage of described contact-making switch two ends with respect to same datum under the control of described control device; And
Described control device is used for controlling described measurement mechanism when receiving from the described close commands of described R-T unit or ON-and OFF-command to begin to measure, compare and measure described contact-making switch two ends that measurement device arrives voltage, and judge described contact-making switch whether normally closed or disconnection according to comparative result with respect to same datum.
Use monitoring method and the system that is used for contact-making switch provided by the present invention, can receive behind close commands or the ON-and OFF-command contact-making switch two ends with respect to the voltage of same datum by judging contact-making switch in the electric automobile high-pressure system, determine contact-making switch whether normally closed or normal the disconnection, a kind of safe and reliable monitoring method that is used for contact-making switch and system are provided, thereby whether the contact-making switch that can judge rightly out by normally closed or disconnection, has avoided occurring that the contact-making switch on-load disconnects and driver and ignorant situation and the security threat of bringing for vehicle and human pilot thus.
Description of drawings
Fig. 1 is the connection block diagram of electric automobile high pressure using electricity system;
Fig. 2 A is the process flow diagram that is used for the monitoring method of contact-making switch according to provided by the invention;
Fig. 2 B is the process flow diagram according to a kind of preferred implementation of the monitoring method that is used for contact-making switch provided by the invention;
Fig. 3 is the functional block diagram that is used for the monitoring system of contact-making switch according to provided by the invention;
Fig. 4 is the circuit diagram according to first embodiment of the monitoring system that is used for contact-making switch provided by the invention;
Fig. 5 is the circuit diagram according to second embodiment of the monitoring system that is used for contact-making switch provided by the invention;
Fig. 6 A and Fig. 6 B are the circuit diagrams according to two kinds of implementations of the signal processing unit of the monitoring system that is used for contact-making switch provided by the invention;
Fig. 7 is the circuit diagram according to the 3rd embodiment of the monitoring system that is used for contact-making switch provided by the invention;
Fig. 8 is the circuit diagram according to the 4th embodiment of the monitoring system that is used for contact-making switch provided by the invention.
Embodiment
With reference now to accompanying drawing, embodiment is described in detail.
The present invention is based on electric automobile high pressure using electricity system shown in Figure 1, a kind of contact-making switch monitoring method is provided.As shown in Figure 1, described consumer 120 can be for the electricity consumption instrument that inserts electric automobile high pressure using electricity system by inverter, insert the electricity consumption instrument of electric automobile high pressure using electricity system, directly insert the electricity consumption instrument that electric automobile high pressure using electricity system uses, for example motor, electric air-conditioning etc. and onboard charger or the like by the DC-DC/ transducer.Usually, for the safety that ensures electric automobile high pressure using electricity system and the immediate current when preventing to insert onboard charger excessive, can insert an anode contact-making switch K11 at the anode of high-tension battery bag 110, and access pre-charge resistance R and precharge contact-making switch K12 in parallel with anode contact-making switch K11.Alternatively, the negative terminal at high-tension battery bag 110 can also insert negative terminal contact-making switch K13.Wherein, described contact-making switch can be relay, IGBT, MOSFET etc.
In electric automobile, closed or disconnect contact-making switch when being switched on or switched off being connected between consumer 120 and the high-tension battery bag 110 when needs, contact-making switch controller (for example battery management system BMS or other control devices, not shown among Fig. 1) can send the close commands or the ON-and OFF-command that are used for contact-making switch, at this moment contact-making switch will be carried out described close commands or ON-and OFF-command.Specifically, when needs were connected consumer 120, if inserted negative terminal contact-making switch K13 in the high pressure using electricity system, then the contact-making switch controller at first sent close commands with closed negative terminal contact-making switch K13 to negative terminal contact-making switch K13; Send close commands with closed precharge contact-making switch K12 to precharge contact-making switch K12 then, and begin to carry out pre-charge process, compare BD both end voltage and AC both end voltage then to judge whether to satisfy the condition that precharge is finished, for example pre-charge process is finished when the BD both end voltage has reached the predetermined ratio of AC both end voltage, and described predetermined ratio scope can be 90%-100%.When precharge condition was satisfied in judgement, the contact-making switch controller sent close commands to anode contact-making switch K11.Afterwards, the contact-making switch controller can also send ON-and OFF-command so that pre-charge circuit is disconnected to precharge contact-making switch K12, has so just realized that the safety of consumer is connected.When needs disconnect consumer 120, the contact-making switch controller can to anode contact-making switch K11, precharge contact-making switch K12, negative terminal contact-making switch K13 at the same time or separately (order in no particular order) send ON-and OFF-command, to disconnect contact-making switch.
According to the detection method that is used for contact-making switch provided by the invention, this method can comprise: in the process of closed contact-making switch or disconnection contact-making switch, measure the voltage of described contact-making switch two ends with respect to same datum respectively; More described contact-making switch two ends are with respect to the voltage of same datum; Judge described contact-making switch whether normally closed or disconnection according to comparative result.
Fig. 2 A is according to the process flow diagram that is used for the monitoring method of contact-making switch provided by the invention.As shown in Figure 2, this method comprises, in step 200, begins closure/disconnection contact-making switch; In step 210, in the process of closed contact-making switch or disconnection contact-making switch, measure the voltage of described contact-making switch two ends respectively with respect to same datum; In step 220, more described contact-making switch two ends are with respect to the voltage of same datum; In step 230, judge described contact-making switch whether normally closed or disconnection according to comparative result.Thereby whether can judge contact-making switch in time by normally closed or disconnection, avoid occurring that the contact-making switch on-load disconnects and driver and ignorant situation and the security threat of bringing for vehicle and human pilot thus.Wherein said predetermined sealing voltage threshold value and described predetermined sealing voltage threshold value can preestablish, and for example described predetermined sealing voltage threshold range is 0V-5V, is preferably 0V, and described predetermined off voltage threshold range is 100V-390V.
Wherein, described method can comprise, in step 230, in the process of closed contact-making switch, if described contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then judge described contact-making switch normally closed, if described contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then continue to measure the voltage at described contact-making switch two ends, till the absolute value of the difference of the voltage at described contact-making switch two ends is less than or equal to predetermined sealing voltage threshold value; And in the process that disconnects contact-making switch, if described contact-making switch two ends with respect to the difference of the voltage of same datum greater than predetermined off voltage threshold value, judge that then described contact-making switch normally disconnects, if described contact-making switch two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then continue to measure the voltage at described contact-making switch two ends, till the difference of the voltage at described contact-making switch two ends is greater than predetermined off voltage threshold value.
Specifically, when closed contact-making switch,, begin closed contact-making switch in step 200; In step 210, in the process of closed contact-making switch, measure the voltage of these contact-making switch two ends respectively with respect to same datum, wherein said datum can be A, B, C, D, the E point among Fig. 1 for the voltage of anode contact-making switch K11, precharge contact-making switch K12, negative terminal contact-making switch K13 one end, also can be ground voltage or other datum that can measure.In step 220, more measured contact-making switch two ends are with respect to the voltage of same datum, and promptly relatively whether the contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum; In step 230, judge whether normally closed of described contact-making switch according to comparative result.If wherein described contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then judge described contact-making switch normally closed, if described contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then turn back to step 210 and continue to measure the voltage of described contact-making switch two ends, till the contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum with respect to same datum.
On the other hand, when needs disconnect contact-making switch, for example automobile stops to travel when needing to disconnect high-tension apparatus 120, and the contact-making switch controller can send ON-and OFF-command to contact-making switch, at this moment can use above-mentioned similar mode to judge whether contact-making switch normally disconnects.Specifically, according to the detection method that is used for contact-making switch provided by the invention, in step 200, begin to disconnect contact-making switch, in step 210, in the process that disconnects contact-making switch, measure the voltage of these contact-making switch two ends respectively with respect to same datum, in step 220, more described contact-making switch two ends are with respect to the voltage of same datum, promptly determine the contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum whether greater than predetermined off voltage threshold value; In step 230, judge according to comparative result whether described contact-making switch normally disconnects, wherein, if the contact-making switch two ends are with respect to the absolute value of the difference of the voltage of same datum during greater than predetermined off voltage threshold value, represent that then contact-making switch disconnects, if the contact-making switch two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then judge the also abnormal disconnection of contact-making switch, in the disconnection process, then also need to return step 210 and continue to measure the voltage of contact-making switch two ends with respect to same datum, up to the contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined off voltage threshold value till.
Fig. 2 B is the process flow diagram of the preferred implementation of the detection method that is used for contact-making switch provided by the invention.Shown in Fig. 2 B, preferably, this method can also be included in step 240, is judging described contact-making switch normally closed or when normally disconnecting, can confirm or disconnect and confirming to the contact-making switch controller reporting is closed.Described thus contact-making switch controller can (having inserted under the situation of negative terminal contact-making switch) send close commands to the precharge contact-making switch after the closure that receives the negative terminal contact-making switch is confirmed report, confirm to send close commands to the anode contact-making switch again after the report in the closure that receives the precharge contact-making switch, and alternatively, confirm to send ON-and OFF-command to the precharge contact-making switch after the report in the closure that receives the anode contact-making switch.And described contact-making switch controller can know that described contact-making switch is normally disconnected when report is confirmed in the disconnection that receives contact-making switch.
Preferably, this method also comprises, pick up counting at the closed contact-making switch of beginning or when beginning to disconnect contact-making switch, if and begin contact-making switch two ends measured in first schedule time behind the closed contact-making switch with respect to the absolute value of the difference of the voltage of same datum always greater than predetermined sealing voltage threshold value, then carry out fault alarm; Be less than or equal to predetermined off voltage threshold value if begin to disconnect contact-making switch two ends measured in second schedule time behind the contact-making switch with respect to the absolute value of the difference of the voltage of same datum always, then carry out fault alarm, so that human pilot or maintenance personal handle.Wherein said first schedule time and described second schedule time can preestablish, and for example described first schedule time scope can be 0.5 second-3 seconds, and described second schedule time scope can be 0.5 second-10 seconds.
Specifically, shown in Fig. 2 B, described method also comprises, when closed contact-making switch, behind the closed contact-making switch of step 200 beginning, can pick up counting in the closed contact-making switch of beginning in step 250; And if after step 220, if the contact-making switch two ends are not to be less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, judge then whether timing arrived for first schedule time, if also do not arrive, then returning step 210 proceeds to measure, if arrived for first schedule time, promptly in first schedule time of beginning behind the closed contact-making switch measured contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum always greater than predetermined sealing voltage threshold value, then, carry out fault alarm in step 260.Correspondingly, when disconnecting contact-making switch, after step 200 begins to disconnect contact-making switch, can when beginning to disconnect contact-making switch, pick up counting in step 250; And if after step 220, if the contact-making switch two ends are not greater than predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, judge then whether timing arrived for second schedule time, if also do not arrive, then returning step 210 proceeds to measure, if arrived for second schedule time, measured contact-making switch two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum always in i.e. second schedule time after beginning to disconnect contact-making switch, then, carry out fault alarm in step 260.
The present invention also provides a kind of monitoring system that is used for contact-making switch, as shown in Figure 3, this system comprises R-T unit 31, measurement mechanism 32 and control device 33, described R-T unit 31 is communicated by letter with described control device 33 respectively with described measurement mechanism 32, wherein: described R-T unit 31 be used to receive the close commands or the ON-and OFF-command of contact-making switch and send described close commands or ON-and OFF-command to control device 33; Described measurement mechanism 32 is used for measuring respectively the voltage of described contact-making switch two ends with respect to same datum under the control of described control device 33; And described control device 33 is used for controlling described measurement mechanism 32 when receiving from the described close commands of described R-T unit 31 or ON-and OFF-command to begin to measure, compare and measure described contact-making switch two ends that device 32 measures voltage, and judge described contact-making switch whether normally closed or disconnection according to comparative result with respect to same datum.
Wherein said R-T unit 31 can receive the close commands or the ON-and OFF-command of contact-making switch, and after close commands that receives contact-making switch or ON-and OFF-command, send it to control device 33, perhaps notify control device 33 R-T units 31 to receive described close commands or ON-and OFF-command, so that control device 33 control survey devices 32 begin to measure, described R-T unit 31 can comprise Receiver And Transmitter, it can be a transmission circuit, transceivers etc. have the device of reception and sending function, and can adopt wired or wireless mode to send and receive.
Described measurement mechanism 32 can realize by switches set, for example shown in the first switches set K1 shown in Fig. 4, and can insert corresponding signal process unit and resistance, for example first signal processing unit 421 among Fig. 4 and resistance R 1, R2; As shown in Figure 4, described measurement mechanism 32 comprises: the first switches set K1, resistance R 1 with at least two switches, three K switch 100, K101, K102 have wherein been comprised among the switches set K1 shown in Fig. 4, the common node of three switches among the described first switches set K1 is connected with an end of described resistance R 1, one end of described resistance R 1 is connected with the first input end Vin1 of described controller 410, the other end ground connection of described resistance R 1, the other end of at least two switches among the described first switches set K1 is connected contact-making switch to be measured two ends.With reference to figure 1 and Fig. 4, when measuring, three K switch 100, K101 and K102 respectively with the high pressure using electricity system shown in Fig. 1 in E, the A at contact-making switch two ends be connected with the B end.Replacedly, described measurement mechanism 32 also comprises five switches, is connected with E, A, B, C and the D end at contact-making switch two ends in the high pressure using electricity system shown in Fig. 1 respectively.
Alternatively, described measurement mechanism 32 can also comprise resistance R 2, is connected between the common node of an end of the common node of the switch among the described first switches set K1 and described resistance R 1 and three switches among the first switches set K1.Alternatively, described measurement mechanism 32 can also comprise first signal processing unit 421, this first signal processing unit 421 is connected between the first input end Vin1 of end of described resistance R 1 and described controller 410, is used for that voltage signal to the contact switch ends amplifies, level conversion or filtering.The exemplary circuit of this signal processing unit 421 be can be shown in Fig. 6 A and Fig. 6 B circuit, wherein having adopted model is the integrated circuit of LM324.This signal processing unit 421 also can be according to concrete needs, and employing can be amplified voltage, other any circuit of level conversion or filtering, does not enumerate one by one at this.
Fig. 7 is the circuit diagram according to the 3rd embodiment of the monitoring system that is used for contact-making switch provided by the invention.Compare with the embodiment among Fig. 5 with Fig. 4, measurement mechanism 32 among Fig. 7 also comprises second switch group K2 and the corresponding resistance R 4 with at least two K switch 103 and K104, the common node of one end of at least two switches among the wherein said second switch group K2 links to each other the other end ground connection of described resistance R 4 with the second input end Vin2 of an end of described resistance R 4 and described controller 410.When measuring, the other end of at least two switches among the described second switch group K2 is connected to the two ends of contact-making switch.Alternatively, measurement mechanism 32 can also comprise resistance R 5, be connected K switch 103 among the second switch group K2, K104 common node, and resistance R 4 between.Alternatively, the described measurement mechanism 32 that connects can also comprise secondary signal processing unit 422, this secondary signal processing unit 422 be connected resistance R 4 and R5 common node, and the second input end Vin2 of described controller 410 between, be used for to voltage signal amplify, level conversion or filtering.
Wherein said control device 33 can be used for: receiving under the situation of close commands, if described contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then judge described contact-making switch normally closed, if described contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then control described measurement mechanism 32 and continue to measure the voltage of described contact-making switch two ends, till described contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum with respect to same datum; Receiving under the situation of ON-and OFF-command, if described contact-making switch two ends with respect to the difference of the voltage of same datum greater than predetermined off voltage threshold value, then described control device judges that described contact-making switch normally disconnects, if described contact-making switch two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then control described measurement mechanism 32 and continue to measure the voltage of described contact-making switch two ends with respect to same datum, up to described contact-making switch two ends with respect to the difference of the voltage of same datum greater than predetermined off voltage threshold value till.Wherein said predetermined sealing voltage threshold value and described predetermined off voltage threshold value can be predefined, and for example described predetermined sealing voltage threshold range is 0V-5V, and described predetermined off voltage threshold range is 100V-390V.
Preferably, described control device 33 can also be used for: when the described contact-making switch of judgement normally closed, generate the closed report of confirming, and send this closure affirmation report via described R-T unit 31; When judging that described contact-making switch normally disconnects, generate to disconnect and confirm report, and send this disconnection via described R-T unit 31 and confirm report.
Preferably, described detection system can also comprise time set 34, this time set 34 is communicated by letter with described control device 33, described control device 33 is controlled described time set 34 and is picked up counting after receiving close commands or ON-and OFF-command, and: if 34 timing of described time set reach described contact-making switch two ends in first schedule time with respect to the absolute value of the difference of the voltage of same datum always greater than predetermined sealing voltage threshold value, then described R-T unit 31 issues the report of being out of order in the control of described control device 33; Be less than or equal to predetermined off voltage threshold value if described time set 34 timing reach described contact-making switch two ends in second schedule time with respect to the absolute value of the difference of the voltage of same datum, then described R-T unit 31 issues the report of being out of order in the control of described control device 33 always.Thereby make human pilot in time learn fault has appearred in the contact-making switch, so that handle.Wherein said first schedule time and described second schedule time can be predefined, and for example described first schedule time scope is 0.5 second-3 seconds, and described second schedule time scope is 0.5 second-10 seconds.
R-T unit 31 and control device 33, and alternatively, time set 34 can merge in as shown in Figure 4 the controller 410 together.Described controller 410 can for single-chip microcomputer, DSP or can for AD converter in conjunction with suitable control device or the like, and can be configured to receive close commands that is used for contact-making switch or ON-and OFF-command from the contact-making switch controller, when receiving close commands or ON-and OFF-command, begin to measure contact-making switch two ends E, A and B with respect to the voltage of same datum and measured voltage is compared, judge described contact-making switch whether normally closed or disconnection according to comparative result then.
Preferably, described monitoring system can also comprise self-diagnostic circuit, fault whether to have occurred by the controller in the self-diagnostic circuit diagnostic detection system 410.This self-diagnostic circuit is connected the input end of controller 410, be used to measure the voltage or the electric current of described input end, and when the voltage of measured input end in the expection voltage range or the electric current of measured input end judge in the controller 410 not in the prospective current scope time and fault occurred, alternatively, this self-diagnostic circuit can send the controller failure report, so that the maintenance personal handles.Expect that wherein voltage range and prospective current scope are predefined, for example expect that voltage range can be 0V-5V, the expection magnitude of voltage can be certain value in this scope; The prospective current scope can be 0mA-20mA, and the prospective current value can be certain value in this scope.
As shown in Figure 4 and Figure 5, this self-diagnostic circuit can comprise resistance R 3 and K switch 3 and reference source, and K switch 3 and resistance R 3 are connected in series in the common node of first signal processing unit 421 and controller 410.Described reference source can be voltage source V ref or current source Iref.Circuit diagram when described reference source being shown among Fig. 4 being voltage source V ref, wherein resistance R 3 is connected with voltage source V ref with K switch 3 series connection backs.Circuit diagram when described reference source being shown among Fig. 5 being current source Iref, wherein current source Iref is connected the common node between the end of end of resistance R 3 and K switch 3, the other end ground connection of resistance R 3, the other end of switch are connected the first input end Vin1 of controller 410.Under the situation that switch in the first switches set K1 all disconnects, Closing Switch K3, measure the voltage or the electric current at controller 410 input end Vin1 places, and compare, just can diagnose whether breaking down in the controller 410 with expection voltage range or prospective current scope.The value of described expection voltage can be the magnitude of voltage of reference voltage source Vref, and the value of described prospective current can be the current value of reference current source Iref.
This self-diagnostic circuit can also comprise K switch 4, and as shown in Figure 7, when reference source was voltage source V ref, an end of K switch 4 was connected the common node of K switch 3 and resistance R 3, and the other end of K switch 4 is connected to the second input end Vin2 of controller 410; Fig. 8 shows the circuit connection diagram when reference source is current source Iref, and wherein an end of K switch 4 is connected with current source Iref, and the other end is connected to the second input end Vin2 of controller 410.Under the situation that switch in first switches set and second switch group all disconnects, closed K3 or K4 or closed simultaneously both, measure the voltage at the controller 410 first input end Vin1 and/or the second input end Vin2 place, and with the expection voltage range compare, perhaps measure the electric current at the first input end Vin1 and/or the second input end Vin2 place, and compare, thereby can judge whether controller 410 fault occurred with the prospective current scope.
Below in conjunction with Fig. 1, Fig. 3 and Fig. 7, specifically describe the specific operation process that is used for the monitoring system of contact-making switch provided by the invention.
When the closed contact-making switch of needs when connecting consumer 120, at first send the close commands that is used for negative terminal contact-making switch K13 by contact-making switch controller (for example battery management system BMS or other control devices) to negative terminal contact-making switch K13 and monitoring system, with closed negative terminal contact-making switch K13, at this moment K switch 103 and the K switch 104 in the controller 410 closed measurement mechanisms 32 is to measure the voltage of negative terminal contact-making switch K13 two ends with respect to same datum.Then, control device 33 in the controller 410 compares the voltage of measured negative terminal contact-making switch K13 two ends with respect to same datum, if the absolute value of the difference of the voltage of negative terminal contact-making switch K13 is less than or equal to predetermined sealing voltage threshold value, then represent negative terminal contact-making switch K13 normally closed, if negative terminal contact-making switch K13 two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then express possibility negative terminal contact-making switch K13 just in closing course, also need to proceed to measure, till negative terminal contact-making switch K13 two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum.After judging negative terminal contact-making switch K13 closure, control device 33 in the controller 410 in the described monitoring system can be controlled R-T unit 31 and confirm report to the closure that the contact-making switch controller sends negative terminal contact-making switch K13, and the contact-making switch controller can also send the close commands that is used for closed precharge contact-making switch K12 to precharge contact-making switch K12 and monitoring system.Preferably, time set 34 picks up counting after described R-T unit 31 receives ON-and OFF-command, if and measured negative terminal contact-making switch K13 two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum in the schedule time after receiving described ON-and OFF-command, then send Trouble Report to the contact-making switch controller always.
After receiving the close commands that is used for closed precharge contact-making switch K12 at R-T unit 31, controller 410 Closing Switch K100 and K101, to measure the voltage of precharge contact-making switch K12 two ends with respect to same datum, then the precharge contact-making switch K12 two ends that the measure voltage with respect to same datum is compared, if precharge contact-making switch K12 two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then represent precharge contact-making switch K12 normally closed, if contact-making switch K12 two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then express possibility precharge contact-making switch K12 just in closing course, also need to proceed to measure.After judging contact-making switch precharge contact-making switch K12 closure, the controller 410 in the monitoring system sends the closed affirmation report of precharge contact-making switch.Preferably, after receiving close commands, R-T unit 31 in described controller 410 picks up counting, if and in the schedule time after receiving described close commands measured contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum always greater than predetermined sealing voltage threshold value, then send Trouble Report to the contact-making switch controller.
Behind precharge contact-making switch K12 normally closed, begin to carry out pre-charge process, this moment controller 410 or other independent controller Closing Switch K102 and K104, measure B, the D two ends are with respect to the voltage of same datum, both differences are the voltage between the BD, cut-off switch K102 and K104 and Closing Switch K101 and K103 then, measure A, the C two ends are with respect to the voltage of same datum, thereby obtain the voltage of AC, judge B by controller 410 then, whether the D both end voltage has reached the predetermined ratio of high-tension battery bag 110 both end voltage, for example the BD both end voltage has reached 90% of AC both end voltage, if reach described predetermined ratio, then the condition that precharge is finished has been satisfied in expression, and this moment, the contact-making switch controller sent the close commands that is used for closed anode contact-making switch K11 to anode contact-making switch K11 and monitoring system.
When needs disconnected contact-making switch, described monitoring system also can use similar mode, by measurement anode contact-making switch K11, precharge contact-making switch K12, the negative terminal contact-making switch K13 two ends voltage with respect to same datum; And more described contact-making switch two ends judge according to comparative result whether described contact-making switch normally disconnects with respect to the voltage of same datum.
Above-mentioned embodiment is the monitoring of carrying out the contact-making switch state by direct relatively contact-making switch two ends with respect to the voltage of same datum.Replacedly, also can pass through relatively A, C, B, C or A, D, whether the voltage between B, D point equates to judge the state of contact-making switch.As implied above, what A, C both end voltage were A, C two ends to the voltage of same datum is poor, and B, C or A, D, the voltage at B, D two ends also can obtain with same account form.
Contact-making switch monitoring method and system according to the invention described above, can receive the voltage at contact-making switch two ends after the control command by the contact-making switch in the electric automobile high-pressure system relatively, determine whether normally closed or disconnect of contact-making switch, and human pilot is in time learnt, thereby provide effectively a kind of and be used for the monitoring method and the monitoring system of contact-making switch reliably, avoided occurring that the contact-making switch on-load disconnects and driver and ignorant situation and the security threat of bringing for vehicle and human pilot thus.
It will be appreciated that top description is just made explanations to the present invention rather than limited of the present inventionly, modification and variation that any those skilled in that art make without creative work according to the present invention are included within protection scope of the present invention.
Claims (15)
1. monitoring method that is used for contact-making switch, this method may further comprise the steps:
1) in the process of closed contact-making switch or disconnection contact-making switch, measures the voltage of described contact-making switch two ends respectively with respect to same datum;
2) more described contact-making switch two ends are with respect to the voltage of same datum;
3) judge described contact-making switch whether normally closed or disconnection according to comparative result.
2. method according to claim 1, wherein step 3) comprises:
In the process of closed contact-making switch,
If described contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then judge described contact-making switch normally closed,
If described contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then continue to measure the voltage at described contact-making switch two ends, till the absolute value of the difference of the voltage at described contact-making switch two ends is less than or equal to predetermined sealing voltage threshold value; And
In the process that disconnects contact-making switch,
If described contact-making switch two ends greater than predetermined off voltage threshold value, judge then that described contact-making switch normally disconnects with respect to the difference of the voltage of same datum,
If described contact-making switch two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then continue to measure the voltage at described contact-making switch two ends, till the difference of the voltage at described contact-making switch two ends is greater than predetermined off voltage threshold value.
3. method according to claim 1 and 2, this method also comprises: when the described contact-making switch of judgement normally closed, report is closed to be confirmed; When judging that described contact-making switch normally disconnects, report disconnects to be confirmed.
4. method according to claim 1, this method also are included in the closed contact-making switch of beginning or pick up counting when beginning to disconnect contact-making switch, and
If begin contact-making switch two ends measured in first schedule time behind the closed contact-making switch with respect to the absolute value of the difference of the voltage of same datum always greater than predetermined sealing voltage threshold value, then carry out fault alarm;
Be less than or equal to predetermined off voltage threshold value if begin to disconnect contact-making switch two ends measured in second schedule time behind the contact-making switch with respect to the absolute value of the difference of the voltage of same datum always, then carry out fault alarm.
5. method according to claim 4, wherein said first schedule time scope are 0.5 second-3 seconds, and described second schedule time scope is 0.5 second-10 seconds.
6. according to the described method of each claim among claim 2 and the 4-5, wherein said predetermined sealing voltage threshold range is 0V-5V, and described predetermined off voltage threshold range is 100V-390V.
7. monitoring system that is used for contact-making switch, this system comprises R-T unit (31), measurement mechanism (32) and control device (33), described R-T unit (31) is communicated by letter with described control device (33) respectively with described measurement mechanism (32), wherein:
Described R-T unit (31) is used to receive the close commands of contact-making switch or ON-and OFF-command and described close commands or ON-and OFF-command is sent to control device (33);
Described measurement mechanism (32) is used for measuring respectively the voltage of described contact-making switch two ends with respect to same datum under the control of described control device (33); And
Described control device (33) is used for controlling described measurement mechanism (32) when receiving from the described close commands of described R-T unit (31) or ON-and OFF-command to begin to measure, compare and measure described contact-making switch two ends that device (32) measures voltage, and judge described contact-making switch whether normally closed or disconnection according to comparative result with respect to same datum.
8. system according to claim 7, wherein said control device (33) is used for receiving under the situation of close commands,
If described contact-making switch two ends are less than or equal to predetermined sealing voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then judge described contact-making switch normally closed,
If described contact-making switch two ends with respect to the absolute value of the difference of the voltage of same datum greater than predetermined sealing voltage threshold value, then control described measurement mechanism (32) and continue to measure the voltage at described contact-making switch two ends, till the absolute value of the difference of the voltage at described contact-making switch two ends is less than or equal to predetermined sealing voltage threshold value;
Receiving under the situation of ON-and OFF-command,
If greater than predetermined off voltage threshold value, then described control device judges that described contact-making switch normally disconnects with respect to the difference of the voltage of same datum at described contact-making switch two ends,
If described contact-making switch two ends are less than or equal to predetermined off voltage threshold value with respect to the absolute value of the difference of the voltage of same datum, then control described measurement mechanism (32) and continue to measure the voltage at described contact-making switch two ends, till the difference of the voltage at described contact-making switch two ends is greater than predetermined off voltage threshold value.
9. according to claim 7 or 8 described systems, wherein, described control device (33) also is used for: when the described contact-making switch of judgement normally closed, generate the closed report of confirming, and send this closure affirmation report via described R-T unit (31); When judging that described contact-making switch normally disconnects, generate to disconnect and confirm report, and send this disconnection via described R-T unit (31) and confirm report.
10. system according to claim 8, this system also comprises time set (34), this time set (34) is communicated by letter with described control device (33), and described control device (33) is controlled described time set (34) and picked up counting after receiving close commands or ON-and OFF-command, and
If described time set (34) timing reach described contact-making switch two ends in first schedule time with respect to the absolute value of the difference of the voltage of same datum always greater than predetermined sealing voltage threshold value, then described R-T unit (31) issues the report of being out of order in the control of described control device (33);
Be less than or equal to predetermined off voltage threshold value if described time set (34) timing reaches described contact-making switch two ends in second schedule time with respect to the absolute value of the difference of the voltage of same datum, then described R-T unit (31) issues the report of being out of order in the control of described control device (33) always.
11. method according to claim 10, wherein said first schedule time scope are 0.5 second-3 seconds, described second schedule time scope is 0.5 second-10 seconds.
12. the described system of arbitrary claim according to Claim 8 and among the 10-11, wherein said predetermined sealing voltage threshold range is 0V-5V, and described predetermined off voltage threshold range is 100V-390V.
13. system according to claim 10, wherein said R-T unit (31), described control device (33) and described time set (34) are integrated in the controller (410).
14. system according to claim 13, this system also comprises self-diagnostic circuit, this self-diagnostic circuit is connected the input end of controller (410), be used to measure the voltage or the electric current of described input end, and when the voltage of measured input end in the expection voltage range or the electric current of measured input end send the controller failure report not in the prospective current scope time.
15. system according to claim 13, wherein said expection voltage range is 0V-5V, and described prospective current scope is 0mA-20mA.
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| CN2009102417899A CN101718842B (en) | 2009-12-11 | 2009-12-11 | Monitoring method and monitoring system for touch switch |
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| CN2009102417899A CN101718842B (en) | 2009-12-11 | 2009-12-11 | Monitoring method and monitoring system for touch switch |
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| CN101718842B CN101718842B (en) | 2012-03-14 |
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