CN103675657A

CN103675657A - Fault detection apparatus and fault detection method for switching elements

Info

Publication number: CN103675657A
Application number: CN201310211739.2A
Authority: CN
Inventors: 朴哉炫
Original assignee: Hyundai Mobis Co Ltd
Current assignee: Hyundai Mobis Co Ltd
Priority date: 2012-09-03
Filing date: 2013-05-31
Publication date: 2014-03-26
Anticipated expiration: 2033-05-31
Also published as: KR20140030598A; CN103675657B; KR101895866B1

Abstract

The invention relates to a fault detection apparatus and a fault detection method for switching elements, wherein according to different switching on/off time of each switching element, the voltage level difference is measured based on resistance values through changing the duty ratios (Duty) of pulse width modulation signals, so that the fault of the switching element can be detected. According to the preferred embodiment of the invention, by means of the fault detection apparatus for switching elements, most faults can be detected by means of the three-phase motor drive part of an intelligent booster adopted during the vehicle brake process. The fault detection apparatus comprises a switch control part used for controlling the on/off (ON/OFF) state of each switching element based on the diversity of the duty ratios, a resistor element part composed of resistor elements connected with all switching elements, a voltage measuring part used for measuring the voltage value of the mutually connected central part of three-phase motors, and a fault detecting part used for detecting whether a switching element is faulted or not based on the above measured voltage value.

Description

On-off element failure detector and detection method

Technical field

The present invention relates to fault detect and the detection method of on-off element.More particularly relate to dutycycle (DUTY) change of the open and close time pulse-width signal of each on-off element, according to resistance value, measure the grade difference of voltage levvl, the on-off element failure detector of detector switch element fault and method invention.

Background technology

The brake system of standard vehicle is to adopt driver to step on the resistance producing after foot brake to come car

The principle of braking.

Recently, intelligently voltage boosting machine has been loaded in the use based on motor booster in brake system, when car is braked again, can play the active brake system of assisting braking.

Intelligently voltage boosting machine brake system drives in row electrodynamic situation with motor, and the action of the reliability of motor is vital.But, because the control of micro-control unit (MCU, Micro Control Unit) is bad, it is bad to manufacture, high flow rate electric current causes heating time delay, the load of accumulation causes the multiple reasons such as semiconductor output is bad can cause the fault (Short) of motor coil to occur during because of rotation.The generation of motor coil fault can cause the large current flowing in brake system loop, cause on-off element fault or

The problems such as the scaling loss of electronic-controlled installation (ECU, Electronic Control Unit) occur.

Even if can produce such problem, the fault detection method for the identical on-off element fault of the field effect transistor (FET, Field Effect Transistor) of intelligently voltage boosting machine brake system does not occur yet now.

Therefore, in intelligently voltage boosting machine brake system, the detection scheme of the on-off element fault identical with field effect transistor needs.

Summary of the invention

(technical matters that will solve)

Its object of the problem that the present invention will solve is to provide failed equipment and the detection method of detector switch element, can answer in reciprocity measure in fault detect, fault notification, failure safe (Fail Safe), detect most on-off element faults of using the motor-drive circuit of intelligently voltage boosting machine in vehicle skidding process.

(means of dealing with problems)

For reaching described problem, in 3 phase motor braking portions of the intelligently voltage boosting machine using in vehicle brake braking procedure to most on-off element failure detectors, it comprises: switch control part, and with the described on-off element of the different control of dutycycle (Duty), each is opened (On) and closes (Off); Resistive element portion, the resistive element being connected with on-off element described in each forms; Voltage determination portion, measures magnitude of voltage at the interconnected core of 3 phase motor; And fault detect portion, utilize whether fault of the voltage detection switch element that determines in described voltage determination portion.

Can be preferably, described on-off element is field effect transistor, described resistive element can be connected with source electrode (Source) end or drain electrode (Drain) end of field effect transistor.

Can be preferably, described switch electronic element is distinguished by upper end on-off element and lower end on-off element two parts, described switch control part between described given zone in described upper end on-off element or described lower end on-off element any one for opening, or described upper end on-off element and described lower end on-off element are all to close, in described motor, exist between the dead space that electric current is not applied in, described variable duty ratio.

Can be preferably, the described fault detect stage is while being described 3 phase motor driving part regular event, the voltage range determining in described voltage determination portion presets, when the voltage of measuring in described voltage determination portion presets voltage range situation described in not being, described on-off element can detect as being out of order.

For reaching described object, in 3 phase motor braking portions of the intelligently voltage boosting machine that on-off element fault detection method is used in vehicle brake braking procedure to most on-off element fault detection methods, it comprises: switch is controlled the stage, and with the described on-off element of the different control of dutycycle (Duty), each is opened (On) or closes (Off); In the voltage determination stage, at the interconnected central part of described 3 phase motor, measure magnitude of voltage; In the fault detect stage, whether utilize the fault of on-off element described in the voltage detecting that described voltage determination determines.

Can be preferably, the resistive element that described on-off element can each connection.

Can be preferably, described on-off element is field effect transistor (FET, Field Effect Transistor), described resistive element is source electrode (Source) end or drain electrode (Drain) end that can be connected in field effect transistor.

Can be preferably, described switch electronic element is distinguished by upper end on-off element and lower end on-off element two parts, described switch control the stage between described given zone in described upper end on-off element or described lower end on-off element any one for opening (On), or described upper end on-off element and described lower end on-off element are all to close (Off), in described motor, exist between the dead space that electric current is not applied in, described variable duty ratio.

Can be preferably, the described fault detect stage is while being described 3 phase motor driving part abnormal operation, the voltage range determining in stage at described voltage determination presets, and when the voltage of measuring in described voltage determination portion presets voltage range situation described in being, described on-off element can be and is out of order.

Can be preferably, described in to preset voltage range be to set according to the variation of the resistive element value of described each connection of on-off element.

(effect of invention)

The present invention can detect the on-off element fault of the motor-drive circuit of intelligently voltage boosting machine.Particularly the present invention can detect the fault of the field effect transistor that 3 phase motor driving part places of intelligently voltage boosting machine brake system occur.

In addition, the present invention, by the fault detect of on-off element, can protect applying the electronic-controlled installation of power supply constraint on motor in advance, driver is carried out to the fault of prompt switch element, by emergency protection being accomplished to prevent the generation of traffic accident.

Accompanying drawing explanation

Fig. 1 is that the present invention is according to the on-off element failure detector figure of embodiment.

Fig. 2 a is that the present invention carries out pulse-width signal the 1st exemplary plot of on-off element control to the switch control part position of switch element fault pick-up unit.

Fig. 2 b is that the present invention carries out pulse-width signal the 2nd exemplary plot of on-off element control to the switch control part position of switch element fault pick-up unit.

Fig. 2 c is that the present invention carries out pulse-width signal the 3rd exemplary plot of on-off element control to the switch control part position of switch element fault pick-up unit.

Fig. 2 d is that the present invention carries out pulse-width signal the 4th exemplary plot of on-off element control to the switch control part position of switch element fault pick-up unit.

Fig. 3 a is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 a same pulse width modulated signal

with

between the current flowing figure that produces.

Fig. 3 b is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 a same pulse width modulated signal with

between the current flowing figure that produces.

Fig. 3 c is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 b same pulse width modulated signal

with

between the current flowing figure that produces

Fig. 3 d is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 c same pulse width modulated signal

with

between the current flowing figure that produces

Fig. 3 e is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 c same pulse width modulated signal

with between the current flowing figure that produces.

Fig. 3 f is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 d same pulse width modulated signal

with

between the current flowing figure that produces.

Fig. 3 g is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 a to Fig. 2 d same pulse width modulated signal

,

,

between the current flowing figure that produces.

Fig. 4 is the work exemplary plot of the fault detect portion detector switch element fault of on-off element failure detector of the present invention.

Fig. 5 is the on-off element detection method dependence diagram that the present invention does according to preferred embodiment.(sign flag explanation)

100: on-off element failure detector

110: switch control part 120: resistive element portion

130: voltage determination portion 40: fault detect portion

150: on-off element 152: upper end on-off element

154: lower end on-off element 160:3 phase motor

Embodiment

By the embodiment with reference to accompanying drawing and following detailed description, following description of contents and will carry out with reference to the corresponding symbol separately of same inscape in accompanying drawing that description thereof is omitted.The known function that the present invention mentions in instructions in addition and consisting of is not verbosely described in further detail.

When mentioning that " connection " or " continuing " situation appears in certain inscape and another kind of inscape, although can directly connect or continue by its inscape, need clear and definite its middle possibility that also has other inscapes to exist.On the contrary, also should be clearly when mentioning that " connection " or " continuing " situation appears in certain inscape and another kind of inscape, in the middle of it, also there is the non-existent possibility of other inscapes.

The singulative of mentioning in instructions, in the situation that being not particularly limited, comprises plural form." the comprising (comprises) " of using in instructions or " (comprising) that comprise " do not get rid of is, mentioning inscape, step, move and/or be beyond element, exist or add more than one other inscapes, step beyond it, move and/or be element.

When on-off element failure detector 100 according to the present invention is the normal running of intelligently voltage boosting machine, detect motor driven switch element fault, strengthen failure safe (Fail Safe) thereby the intelligently voltage boosting machine security of system of raising vehicle.On-off element has field effect transistor (FET, Field Effect Transistor) etc.

According to the present invention, on-off element failure detector 100 is applicable to intelligently voltage boosting machine system the inside brushless AC motor (Brushless AC Motor) or the 3 phase motor driving parts of vehicle.As follows accompanying drawing describes switch element fault pick-up unit together according to the preferred embodiment.

Fig. 1 is on-off element failure detector drawing according to an embodiment of the invention.

With reference to Fig. 1, on-off element failure detector 100 comprises switch control part 110, resistive element portion 120, voltage determination portion 130 and fault detect portion 140.

3 phase motors 160 of intelligently voltage boosting machine drive loop to have 6 on-off elements 150, and 3 phase motors 160 of general intelligence booster drive loop to have 6 on-off elements 150, but are not absolute numbers.On-off element 150 is used FET to realize.In order to help to understand the present invention, will drive the on-off element pick-up unit in loop to describe to the 3 phase motors 160 of being realized by 6 FET.

6 on-off elements 150 are respectively S1, S2, S3, S4, S5 and S6, as Fig. 1 connects.S1, S2 and S3 are upper end on-off element 152, and S4, S5 and S6 are lower end on-off element 154.Lower end on-off element 154 is circular..

The present invention is to be that the 130 li of detected voltages of normal voltage table and voltage determination portion when the regular event are compared with 3 phase motor 160 drive divisions of having set according to on-off element failure detector 100, and the detection that judges on-off element 150 whether.Therefore, to first carrying out the regular event explanation of 3 phase motors 160 under the prerequisite of on-off element failure detector 100 explanations of the present invention.

The actions that in regular event situation, 6 of switch control part 110 on-off elements 150 are controlled separately, both, switch control part 110 had utilized pulse-width signal opening (On) or closing (Off) and control on-off element 150.

Preferably, switch control part 110 controls between given zone to each on-off element 150 so that signal dutyfactor (Duty) is different that in upper end on-off element 152 or lower end on-off element 154, any one is all to close for opening state or upper end on-off element 152 and lower end on-off

element

154, and 160 li, 3 phase motor exists between the dead space that electric current is not applied in so.Fig. 2 a be according to the present invention in the switch control part of on-off element failure detector, be the legend of the pulse-width signal of gauge tap element.Fig. 2 b be the present invention in the switch control part of on-off element failure detector, be another exemplary plot of pulse-width signal of gauge tap element.Fig. 2 c be the present invention in the switch control part of on-off element failure detector, be the another exemplary plot of pulse-width signal of gauge tap element.

with

between the current flowing figure that produces.Fig. 3 b is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 a same pulse width modulated signal

with

between the current flowing figure that produces.Fig. 3 c is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 b same pulse width modulated signal

with

between the current flowing figure that produces.Fig. 3 d is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 c same pulse width modulated signal

with

between the current flowing figure that produces.Fig. 3 e is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 c same pulse width modulated signal

with

between the current flowing figure that produces.Fig. 3 f is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 d same pulse width modulated signal

with

between the current flowing figure that produces.Fig. 3 g is when to be the present invention apply the switch control part position of switch element fault pick-up unit and Fig. 2 a, Fig. 2 b or Fig. 2 c same pulse width modulated signal

,

,, between the current flowing figure that produces.

On-off element control part 110 is controlled each on-off element signal dutyfactor

different, between given zone, can exist the example between dead space to come with reference to explanation with Fig. 2 a～2d and 3a～3g.

Fig. 2 a～Fig. 2 d is the signal diagram that S1～S3 applies, and the pulse-width signal that S4～S6 applies is the anti-phase of each signal of applying of S1～S3.That is, the signal that S1 applies is for on-off element 150S1 is opened, and the signal that S4 applies is for on-off element 150S4 is opened.The anti-phase that S2 and S5 match, after S3～S6 coupling, the signal of anti-phase is applied in mutually.

The signal that switch control part 110 applies is as wide in the signal of Fig. 2 a to Fig. 2 d, i.e. wide axle or time shaft.Observe each signal of Fig. 2 a to Fig. 2 d, the dutycycle that S1, S2 and S3 apply is different.

Dutycycle is different, in Jian Li upper end, given zone on-off element 152 or lower end on-off element 154, any one is all to close for opening state or upper end on-off element 152 and lower end on-off

element

154, and 160 li, 3 phase motor exists between the dead space that electric current is not applied in so.

Particularly, at switch control part 110 and Fig. 2 a same signal, in on-off element 150S1, S2 and S3, apply, the inverse phase signal of Fig. 2 a exists as the words that apply in on-off element 150S4, S5 and S6

with

in interval, on-off element 150S3, S4 and S5 are for opening, and on-off element 150S1, S2 and S6 are for closing.When now, 160 li, 3 phase motor applies electric current, generation current identical with Fig. 3 a flows.

At switch control part 110 and Fig. 2 a same signal, in on-off element 150S1, S2 and S3, apply, the inverse phase signal of Fig. 2 a exists as the words that apply in on-off element 150S4, S5 and S6

with

in interval, on-off element 150S2, S3 and S4 are for opening, and on-off element 150S1, S5 and S6 are for closing.When now, 160 li, 3 phase motor applies electric current, generation current identical with Fig. 3 b flows.

At switch control part 110 and Fig. 2 b same signal, in on-off element 150S1, S2 and S3, apply, the inverse phase signal of Fig. 2 b exists as the words that apply in on-off element 150S4, S5 and S6

with

in interval, on-off element 150S1, S4 and S5 are for opening, and on-off element 150S2, S3 and S6 are for closing.When now, 160 li, 3 phase motor applies electric current, generation current identical with Fig. 3 c flows.

At switch control part 110 and Fig. 2 c same signal, in on-off element 150S1, S2 and S3, apply, the inverse phase signal of Fig. 2 c exists as the words that apply in on-off element 150S4, S5 and S6

with

in interval, on-off element 150S1, S2 and S6 are for opening, and on-off element 150S3, S4 and S5 are for closing.When now, 160 li, 3 phase motor applies electric current, generation current identical with Fig. 3 d flows.

with

in interval, on-off element 150S2, S4 and S6 are for opening, and on-off element 150S1, S3 and S5 are for closing.When now, 160 li, 3 phase motor applies electric current, generation current identical with Fig. 3 e flows.

At switch control part 110 and Fig. 2 d same signal, in on-off element 150S1, S2 and S3, apply, the inverse phase signal of Fig. 2 c exists as the words that apply in on-off element 150S4, S5 and S6

with

in interval, on-off element 150S1, S3 and S5 are for opening, and on-off element 150S2, S4 and S6 are for closing.When now, 160 li, 3 phase motor applies electric current, generation current identical with Fig. 3 f flows.

The current trend occurring in Fig. 3 a～3f can be seen current trend in 160 li, 3 phase motor.

But, the situation of Fig. 3 g, when 110 li of Fig. 2 a～Fig. 2 c of switch control part signal identical with its inverse phase signal applied by switch separately,

with

in interval, on-off element 150 is all closed,

in interval, on-off element 150 is all out, and these 3 phase motor, 160 electric currents is not flowed.That is, in Fig. 2 a～2c ,

and

interval is idle space.

The signal that switch control part 110 applies is not defined in Fig. 2 a～2d, exists duty ratio modulation between dead space can apply various signal, and the current flowing of Fig. 3 a～3g changes according to the signal applying.

According to the present invention, on-off element failure detector 100 can be connected the resistive element of 150 li of on-off elements separately.When on-off element 150 is field effect transistor, resistive element is as connected in Fig. 1.That is, resistive element can be connected separately with field effect transistor source, upper end (Source) end or the drain electrode (Drain) of the lower end field effect transistor of lower end on-off element 154 end of upper end on-off element 152.With reference to Fig. 1, the source S ource of S1, S2 and S3) end is connected with each R1, R2 and R3, and the drain electrode end of S4, S5 and S6 is connected with each R4, R5 and R6.S1～S6 is on-off element 150, and R1～R6 is the resistive element of resistive element portion 120.

The resistive element portion 120 being connected to form by resistive element can identify the variation of voltage under the state being applied at 130 li of fixed voltages of voltage determination portion as each field effect transistor.

; according to the present invention, on-off element failure detector 100 is that resistive element separately as upper end on-off element 152 and lower end on-off element 154 is connected; according to illustrated before, under 6 kinds of current forms of Fig. 2 and Fig. 3, according to resistance value, can produce electric pressure difference, fault that can detector switch element 150 according to difference.

The words that describe in detail with reference to Fig. 1, the existence that matches of 3 phase motor 160u, v and w and separately upper end field effect transistor and lower end field effect transistor, resistance because connecting between the upper end field effect transistor after coupling and lower end field effect transistor, can produce electric pressure difference according to resistance value while being applied by 6 kinds of current forms.Fault detect portion 140 utilizes this electric pressure difference can detect the fault of the field effect transistor of 3 phase motors 160.

Voltage detection department is identical with Fig. 1, and the central point of 3 phase motors 160 is preferably the mensuration of voltage.

Because of on-off element 150 open circuit or when the failure cause such as short circuit causes 3 phase motors 160 that abnormal operation occurs, the magnitude of voltage of voltage detection department and the magnitude of voltage of regular event are not inconsistent.

Therefore, fault detect portion 140 130 li of magnitudes of voltage that determine of voltage detection department and the voltage range that presets regular event state compare can draw on-off element 150 fault whether.There is the problems such as short circuit of opening circuit of on-off element 150 or on-off element 150 in the fault of on-off element 150.

When out of order situation detects in fault detect portion 140, the action of 3 phase motors 160 can be interrupted in fault detect portion 140, and opens failure safe (Fail Safe) pattern.

Failure safe pattern refers to that working pressure amplification carries out other brake system modes of use of mechanical brake mode of braking etc. and carry out car brakeing pattern.

The default voltage range that is decided to be regular event state can be along with kind, the performance of on-off element 150, the changes such as performance of the size of resistance, the quantity of on-off element 150, the size of input power, 3 phase motors 160 of on-off element 150.

Or whether fault detect portion 140 can arrange fault at voltage detection department 130 in advance according to the magnitude of voltage determining.That is, fault detect portion 140 judges according to the grade of the magnitude of voltage determining whether on-off element 150 breaks down at voltage detection department 130, can be set in advance on-off element 150 in what kind of grade and can detect fault.

Each resistance value that forms resistive element portion 120 mutually can be different, and therefore, fault detect portion 140 can detect concrete which on-off element 150 breaks down.

Fig. 4 is the fail operation exemplary plot of the fault detect portion detector switch element of on-off element failure detector of the present invention.

With reference to Fig. 4, the words that the fault illustration of fault detect portion 140 detector switch elements 150 is described, the field effect transistor of the on-off element 150 of Fig. 4 a to f S1, S5 and S6 is when opening (ON), and in 6 field effect transistors one of them for opening circuit or during short circuit, setting with regard to the magnitude of voltage determining from voltage determination portion 130.

With reference to Fig. 4 a figure, S1 is situation about breaking down.When the measured value of voltage determination portion 130 is OV, fault detect portion 140 can judge that S1 switch, for opening circuit, can detect the fault of on-off element 150 or open circuit.And, when the voltage determination portion measured value of fault detect portion 140 is 9.17V, can detect the short circuit of on-off element 150.

With reference to Fig. 4 b figure, if during the situation that S2 is fault, voltage determination portion 130 values of fault detect portion 140 are D.C., at this moment can detect on-off element 150 for opening circuit, and are 13V, and at this moment can detect on-off element 150 is short circuit.

With reference to Fig. 4 c figure, if during the situation that S3 is fault, voltage determination portion 130 values of fault detect portion 140 are D.C., at this moment can detect on-off element 150 for opening circuit, and are 9.17V～13V, and at this moment can detect on-off element 150 is short circuit.

With reference to Fig. 4 d figure, if during the situation that S4 is fault, voltage determination portion 130 values of fault detect portion 140 are D.C., at this moment can detect on-off element 150 for opening circuit, and are OV, and at this moment can detect on-off element 150 is short circuit.

With reference to Fig. 4 e figure, if during the situation that S5 is fault, voltage determination portion 130 values of fault detect portion 140 are OV～9.17V, at this moment can detect on-off element 150 for opening circuit, and are D.C., and at this moment can detect on-off element 150 is short circuit.

With reference to Fig. 4 f figure, if during the situation that S6 is fault, voltage determination portion 130 values of fault detect portion 140 are OV～9.17V, at this moment can detect on-off element 150 for opening circuit, and are D.C., and at this moment can detect on-off element 150 is short circuit.

The magnitude of voltage numerical value exemplifying in Fig. 4, can carry out different settings along with forming the resistance value of these resistive elements of resistive element portion, also can dissimilate along with the kind of on-off element 150,3 phase motor 160 grades.Under normal condition, the voltage of voltage determination portion 130 interior mensuration also can dissimilate along with each resistive element resistance value of resistive element portion 120.

According to the present invention, the resistive element of on-off element failure detector 100 resistive element portions 120 resistance value is separately all different, can judge the detection of particular switch element, which when the out of order words of on-off element also can cause traffic hazard, because also can detect concrete on-off element in most on-off element 150, go wrong.

Whether, when fault detect portion 140 detects the fault of on-off element 150, fault detect portion 140 will give the alarm to point out driver, can remind intelligently voltage boosting machine to break down or whether on-off element 150 breaks down with sound or vibration mode.

Fig. 5 is that the present invention is preferably embodiment of basis, about the process flow diagram of on-off element detection method.

With reference to Fig. 5, be according to can preferred embodiment, switch element testing method is described, switch control part 110 dutycycles (Duty) are different to be left (On) or closes (Off) each and control (S510 stage).

Resistive element portion allows the voltage generation grade difference determining be connected (S520 stage) with the resistive element of 150 li of on-off elements.Voltage determination portion 130 carries out voltage determination (S530 stage) in 3 phase motor center.

Fault detect portion 140 is used and has measured the fault that voltage carries out detector switch element 150, fault detect portion 140, when on-off element 150 detects fault, starts failure safe pattern (S550 stage) and in modes such as sound, vibration, light, warns the fault of reminding driver's on-off element 150.

According to the present invention, on-off element pick-up unit 100 and detection method can detect on-off element 150 faults of the driving circuit of intelligently voltage boosting machine, field effect transistor (FET, the Field Effect Transistor) fault that the special 3 phase motors 160 that can detect intelligently voltage boosting machine brake system in the present invention produce in drive division.

And the fault that on-off element pick-up unit and detection method can detector switch elements according to the present invention, limits in advance the power supply applying in 3 phase motors and protects electronic-controlled installation.Therefore report to driver and can install trouble-saving generation by automatically anti-about the fault of on-off element 150.

The present invention is that the drawing of on-off element failure detector 100 is interpreted as the principle of this invention and sets forth viewpoint with concrete examples of implementation in embodiment preferably.Be similar to, whether all process flow diagram available computers read-write media have been implemented, no matter computing machine or processor illustrate expressly, illustrate, can be regarded as by computing machine or processor and carry out various program.Can provide comprise can the drawing by the functional block of processor or representation of concept similarly on, illustrated various element, the function of these elements not only can be used on special-purpose hardware, also can be provided on suitable software or relevant software.When processor is provided, can divides other processor by the single application specific processor of described performance, single common processor or majority, or share a part wherein.

And when processor, control or similarly concept term propose, correct use should be to have the hardware of executive software ability need not illustrate and be cited as exclusiveness, unrestricted signal processor (DSP) be storage hardware, software, need to understand imply comprise ROM (read-only memory) (ROM), random access memory (RAM) and non-volatility memorizer.Also can comprise known other habitual hardware.

Above-mentioned explanation only as technological thought illustration of the present invention, the personnel of the technical field of the invention knowledge can carry out various correction, change and displacement not departing within the scope of essential characteristic of the present invention.Therefore; the example that the present invention launches and the drawing of reference are to be not defined in this in order to describe in detail; according to above-described embodiment and with reference to drawing technological thought scope of the present invention, be not limited to this; protection scope of the present invention is understood by following claim, and all technological thoughts in scope equal with it are contained in scope of authority of the present invention.

Claims

1. on-off element failure detector is used the 3 phase motor driving parts at intelligently voltage boosting machine can detect most on-off element faults when vehicle brake is braked, and it comprises:

Switch control part, with the Push And Release of each on-off element described in the different control of dutycycle (Duty);

Resistive element portion, the resistive element that each is connected with described on-off element forms;

Voltage determination portion, measures magnitude of voltage at the interconnective central part of described 3 phase motor; And

Fault detect portion, utilizes the voltage determining in described voltage determination portion whether to detect described on-off element fault.

2. on-off element failure detector according to claim 1, is characterized in that,

Described on-off element is field effect transistor (FET, Field Effect Transistor),

Described resistive element is connected with source electrode (Source) end or drain electrode (Drain) end of field effect transistor.

3. on-off element failure detector according to claim 1, is characterized in that,

Described on-off element can be divided into upper end on-off element and lower end on-off element,

Described switch control part, no matter arbitrary for opening or described upper end on-off element and described lower end on-off element are all pass in described upper end on-off element or described lower end on-off element between described given zone, in described motor, exist and do not apply between the dead space of electric current, described variable duty ratio.

4. on-off element failure detector according to claim 1, is characterized in that,

Described fault detect portion, the voltage range that described 3 phase motor driving parts are measured in voltage determination portion described in when regular event presets,

When described voltage determination portion has measured voltage and presets voltage range described in not being, described on-off element detects fault.

5. on-off element fault detection method, in 3 phase drive divisions of the intelligently voltage boosting machine using while braking according to vehicle brake, the fault detection method of a plurality of on-off elements, is characterized in that, comprises

Switch is controlled the stage, with each open or close of the described on-off element of the different control of dutycycle (Duty);

In the voltage determination stage, described mensuration 3 phase motors are interconnected on the magnitude of voltage of core;

In the fault detect stage, utilize the voltage detection switch element fault that determines in described voltage determination portion.

6. on-off element fault detection method according to claim 5, is characterized in that,

Described on-off element is connected with each resistive element.

7. on-off element fault detection method according to claim 5, is characterized in that,

Described resistive element is that source electrode (Source) end drain electrode (Drain) end of field effect transistor is connected.

8. on-off element fault detection method according to claim 5, is characterized in that,

Described on-off element is divided into upper end on-off element and lower end on-off element,

Described switch is controlled the stage, arbitrary for opening or when described upper end on-off element and described lower end on-off element are all pass in described upper end on-off element or described lower end on-off element between described given zone, in described motor, exist and do not apply between the dead space of electric current, described variable duty ratio.

9. on-off element fault detection method according to claim 1, is characterized in that,

The voltage range of measuring in the voltage determination stage described in during the abnormal operation of described 3 phase motor driving parts presets,

When described voltage determination has been measured voltage and presetted voltage range described in being in the stage, described on-off element detects fault.

10. on-off element fault detection method according to claim 9, is characterized in that,

The described voltage range that presets is along with the resistive element value of described each connection of on-off element is carried out different set.