CN209638386U - A kind of control switch circuit for automotive electronic parking system EPB - Google Patents

Abstract

The utility model discloses a kind of control switch circuits for automotive electronic parking system EPB.Control switch is mainly by backlight lighting circuit M1, EPB movement indicating circuit M2, automatic parking function open instruction circuit M3 and three independent double control switch circuits, three double control switch circuits are respectively pull-up double control switch circuit M4, release movement double control switch circuit M5, automatic parking function double control switch circuit M6 composition, and are connected with resistance R1~R9, triode Q1~Q3, diode D10~D30 in the master chip of electronic controller ECU.The utility model meets the requirement of EPB functional safety, meets the integrated wake-up of switch and the identification requirement of AUTOHOLD function signal under EPB functions expanding.

Description

A kind of control switch circuit for automotive electronic parking system EPB

Technical field

The utility model relates to a kind of control switch circuit for automotive electronic parking system EPB, this switch can be incited somebody to action The parking intention of driver is converted to electric signal and passes to EPB electronic control unit ECU, to control the execution of automobile parking actuator Parking movement.

Background technique

Raising with national standard to passenger car safety requirements, user propose the comfort and aesthetics that drive vehicle Higher demand, traditional mechanical parking brake is less to accord with the demands of the market.And the generation of EPB electronics parking brake control switch, centainly It is solved this problem in that in degree.

Traditional EPB switch is that single transmission a certain kind signal (analog or digital) is known to control unit signal Not.Same signal identification easily occur in use common cause failure (same signal type to the interference of certain environment all It is more sensitive), do not meet the requirement of functional safety.It is integrated to switch to wake up and AUTOHOLD simultaneously with the expansion of EPB function The identification of function signal has lacked independent control circuit measure and means.

Utility model content

In order to solve the technical problems in background technology, the utility model proposes one kind to be used for automotive electronic parking The control switch circuit of system EPB, can meet the requirement of EPB functional safety, and the switch met under the expansion of EPB function is integrated The identification of the function signal of wake-up and automatic parking solves and requests identification there are inaccuracy to driver switch and switch function Technical problem that can not be diversified.

By the redundancy check of digital signal and analog signal, the request of the Operation switch of user is identified, enhance identification Switch the functional safety of request.The signal identification of integrated switch wake-up and automatic parking function in switching, therefore more vehicles can be matched Carry the functional requirement of application.

The technical solution adopted in the utility model is as follows:

It include control switch and electronic controller ECU in the electronic parking system EPB of the utility model.

The control switch is mainly acted by backlight lighting circuit (Rearview Lightening) M1, EPB and is indicated The independent double control switch electricity of circuit (EPB LAMP) M2, M3 and three, automatic parking function open instruction circuit (AUTO LAMP) Road, three double control switch circuits are respectively pull-up double control switch circuit (Brake) M4, release movement double control switch circuit (Release) M5, automatic parking function double control switch circuit (Auto Hold) M6 are constituted, and in the master of electronic controller ECU Chip, which is added, is connected with resistance R1~R9, triode Q1~Q3, diode D10~D30.

Backlight lighting circuit M1 includes current-limiting resistance R10, light emitting diode D1 and decoupling capacitor C1, current-limiting resistance R10, Both ends after light emitting diode D1 and decoupling capacitor C1 is sequentially connected in series and connects are grounded, current-limiting resistance R10 and decoupling capacitor C1 Between midpoint draw connect+12V power supply.

It includes current-limiting resistance R11, light emitting diode D2 and decoupling capacitor C2, current-limiting resistance that EPB, which acts indicating circuit M2, R11, light emitting diode D2 and decoupling capacitor C2 are sequentially connected in series, the end ground connection of decoupling capacitor C2, current limliting electricity after series connection after series connection Hinder R11 end by foot 1 connect ECU inside triode Q1 collector, between current-limiting resistance R11 and decoupling capacitor C2 in Point draws and connects+12V power supply；The emitter of triode Q1 is grounded, and the base stage of triode Q1 connects the master chip of electronic controller ECU Enabled pin CTR1.

Automatic parking function open instruction circuit M3 includes current-limiting resistance R12, light emitting diode D3 and decoupling capacitor C3, limit Leakage resistance R12, light emitting diode D3 and decoupling capacitor C3 are sequentially connected in series, the end ground connection of decoupling capacitor C3 after series connection, after series connection The end of current-limiting resistance R12 connects the collector of the triode Q2 inside ECU, current-limiting resistance R12 and decoupling capacitor C3 by foot 2 Between midpoint draw connect+12V power supply；The emitter of triode Q2 is grounded, and the base stage of triode Q2 meets the master of electronic controller ECU The enabled pin CTR2 of chip.

Pull-up double control switch circuit M4 includes switch S1, resistance R13~R15, and there are two common ends point for switch S1 tool Not Wei S11, S14, tool there are four terminals be respectively S12, S13, S15, S16；Terminals S12 ground connection, terminals S13 pass through electricity Resistance R14 is connected to+12V power supply, and terminals S15 is in vacant state, and terminals S16 is grounded by resistance R15；Common end S11 is logical One end that the series connection of foot 4 is connected to the current-limiting resistance R3 inside ECU is crossed, the current-limiting resistance R3 other end is connected to electronics control through diode D10 The inside of the master chip of device ECU processed wakes up mouth WAKE UP；Common end S14 by foot 3 be coupled with resistance R1 inside ECU and One end of resistance R2, the other end of resistance R1 are connected to the modulus acquisition switched pins ADC1 of the master chip of electronic controller ECU With general input/output port GPIO1, the another of resistance R2 terminates to+5V power supply.

Release movement double control switch circuit M5 includes switch S2, resistance R16~R18, and there are two common ends point for switch S2 tool Not Wei S21, S24, tool there are four terminals be respectively S22, S23, S25, S26；Terminals S22 ground connection, terminals S23 pass through electricity Resistance R17 is connected to+12V power supply, and terminals S25 is in vacant state, and terminals S26 is grounded by resistance R18；Common end S21 is logical One end that the series connection of foot 6 is connected to the current-limiting resistance R6 inside ECU is crossed, the current-limiting resistance R6 other end is connected to electronics control through diode D20 The inside of the master chip of device ECU processed wakes up mouth WAKE UP；Common end S24 by foot 5 be coupled with resistance R4 inside ECU and One end of resistance R5, the other end of resistance R4 are connected to the modulus acquisition switched pins ADC2 of the master chip of electronic controller ECU With general input/output port GPIO2, the another of resistance R5 terminates to+5V power supply.

Automatic parking function double control switch circuit M6 includes switch S3, resistance R19~R21, and there are two public for switch S3 tool End is respectively S31, S34, and tool is respectively S32, S33, S35, S36 there are four terminals；Terminals S32 ground connection, terminals S33 are logical It crosses resistance R20 and is connected to+12V power supply, terminals S35 is in vacant state, and terminals S36 is grounded by resistance R21；Common end S31 is connected to one end of the current-limiting resistance R9 inside ECU by the series connection of foot 8, and the current-limiting resistance R9 other end is connected to electricity through diode D30 The inside of the master chip of sub-controller ECU wakes up mouth WAKE UP；Common end S34 is coupled with the resistance inside ECU by foot 7 One end of R7 and resistance R8, the other end of resistance R7 are connected to the modulus acquisition switched pins of the master chip of electronic controller ECU The another of ADC3 and general input/output port GPIO3, resistance R8 terminates to+5V power supply.

Inside is provided in the master chip of the electronic controller ECU containing redundancy check module, inside contains redundancy check Mould acquires switched pins ADC foot by modulus and acquires pull-up double control switch circuit M4/ release movement double control switch circuit M5/ The digital trigger signal generated after switch S1/S2/S3 movement in three circuits of automatic parking function double control switch circuit M6, General input/output port GPIO acquires pull-up double control switch circuit M4/ release movement double control switch circuit M5/ automatic parking The simulation trigger signal generated after switch S1/S2/S3 movement in three circuits of function double control switch circuit M6, and then to mould Quasi- trigger signal and digital trigger signal carry out verification comparison, to accurately identify the state after obtaining switch motion.

In the pull-up double control switch circuit M4, common end S11 and terminals S12, S13 constitute first group of list Double-pole double throw switch, common end S14 and terminals S15, S16 constitute second group of single-pole double-throw switch (SPDT), two groups of single-pole double-throw switch (SPDT)s Constitute double-point double-throw switch；Common end S11 and common end S14 are moved synchronously, respectively by terminals S12 and terminals S15 Switch connection between the group of terminals of composition and the group of terminals being made of terminals S13 and terminals S16.

In order to meet EPB switch can wake up EPB control unit (wake up EPB refer to vehicle for power saving, so that EPB For power-down state, that is, suspend mode, when driver actions' switch EPB just restores normal operating conditions), the utility model switch designs One wakeUP circuit branch when the movement of switch is collected the variation of height point by this line by MCU, so that it may Triggering EPB ECU enters normal operating conditions (non-battery saving mode).

The beneficial effects of the utility model are:

It is total to also avoid same recognition methods bring while adding signal identification redundant module for the utility model Because of the risk (such as two channel signal recognition methods of redundancy is all number identification or two channels are all simulation identification) of failure, and make What is switched is full-featured, can fill up blank functionally.

The utility model passes through the redundancy check of digital signal and analog signal, identifies the request of the Operation switch of user, Enhance the functional safety of identification switch request.

The signal identification of integrated switch wake-up and AUTOHOLD (automatic parking) function in the switch of the utility model, therefore energy Match the functional requirement of more vehicular applications.

Detailed description of the invention

Fig. 1 is the circuit diagram of the utility model.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe.It should be noted that in the absence of conflict, the spy in embodiment and embodiment in the application Sign can be combined with each other.

As shown in Figure 1, including that control switch and electronic controller ECU, control switch are connected in electronic parking system EPB Electronic controller ECU, electronic controller ECU have a master chip, and control switch is mainly by backlight lighting circuit (Rearview Lightening) M1, EPB act indicating circuit (EPB LAMP) M2, automatic parking function open instruction circuit (AUTO LAMP) M3 and three independent double control switch circuit, three double control switch circuits are respectively pull-up double control switch Circuit (Brake) M4, release movement double control switch circuit (Release) M5, automatic parking function double control switch circuit (Auto Hold) M6 is constituted, and is added in the master chip of electronic controller ECU and be connected with resistance R1~R9, triode Q1~Q3, two poles Pipe D10~D30, resistance R1~R9, triode Q1~Q3 and diode D10~D30 are respectively positioned on inside automobile ECU.

As shown in Figure 1, backlight lighting circuit M1 includes current-limiting resistance R10, light emitting diode D1 and decoupling capacitor C1, limit Both ends after leakage resistance R10, light emitting diode D1 and decoupling capacitor C1 are sequentially connected in series and connect are grounded, current-limiting resistance R10 and Midpoint draws and connects+12V power supply between decoupling capacitor C1；Light emitting diode D1 maintains a normally open state as work master pilot lamp.

As shown in Figure 1, EPB movement indicating circuit M2 includes current-limiting resistance R11, light emitting diode D2 and decoupling capacitor C2, Current-limiting resistance R11, light emitting diode D2 and decoupling capacitor C2 are sequentially connected in series, the end ground connection of decoupling capacitor C2, series connection after series connection The end of current-limiting resistance R11 connects the collector of the triode Q1 inside ECU, current-limiting resistance R11 and decoupling capacitor by foot 1 afterwards Midpoint draws and connects+12V power supply between C2；The emitter of triode Q1 is grounded, and the base stage of triode Q1 connects electronic controller ECU's The enabled pin CTR1 of master chip；Light emitting diode D2 enables pin by internal control as EPB action indicator, ECU CTR1, control triode Q1 determine whether EPB action indicator is lighted.

As shown in Figure 1, automatic parking function open instruction circuit M3 includes current-limiting resistance R12, light emitting diode D3 and goes Coupling capacitor C3, current-limiting resistance R12, light emitting diode D3 and decoupling capacitor C3 are sequentially connected in series, the end of decoupling capacitor C3 after series connection Ground connection, the end of current-limiting resistance R12 connects the collector of the triode Q2 inside ECU, current-limiting resistance R12 by foot 2 after series connection Midpoint draws and connects+12V power supply between decoupling capacitor C3；The emitter of triode Q2 is grounded, and the base stage of triode Q2 connects electronics The enabled pin CTR2 of the master chip of controller ECU；Light emitting diode D3 passes through interior as automatic parking functional indicator light, ECU Portion controls enabled pin CTR2, and control triode Q2 determines whether automatic parking functional indicator light is lighted.

As shown in Figure 1, pull-up double control switch circuit M4 includes switch S1, resistance R13~R15, switch S1 has two A common end is respectively S11, S14, and tool is respectively S12, S13, S15, S16 there are four terminals；Common end S11 and terminals S12, S13 constitute single-pole double-throw switch (SPDT), and common end S14 and terminals S15, S16 constitute single-pole double-throw switch (SPDT)；Terminals S12 ground connection, terminals S13 are connected to+12V power supply by resistance R14, and terminals S15 is in vacant state, and terminals S16 passes through Resistance R15 ground connection；Common end S11 is connected to one end of the current-limiting resistance R3 inside ECU by the series connection of foot 4, and current-limiting resistance R3 is another The inside for the master chip that end is connected to electronic controller ECU through diode D10 wakes up mouth WAKE UP；Common end S14 is divided by foot 3 One end of the resistance R1 and resistance R2 that are not connected to inside ECU, another master chip for terminating to electronic controller ECU of resistance R1 Modulus acquires switched pins ADC1, general input/output port GPIO1, and the another of resistance R2 terminates to+5V power supply, and foot 3 leads to simultaneously Cross resistance R13 ground connection；Foot 3 become resistance R2 connect with resistance R13 divide midpoint, 3 voltage value of foot by ECU modulus acquisition Switched pins ADC1 is read.

As shown in Figure 1, release movement double control switch circuit M5 includes switch S2, resistance R16~R18, switch S2 has two A common end is respectively S21, S24, and tool is respectively S22, S23, S25, S26 there are four terminals；Common end S21 and terminals S22, S23 constitute single-pole double-throw switch (SPDT), and common end S24 and terminals S25, S26 constitute single-pole double-throw switch (SPDT)；Terminals S22 ground connection, terminals S23 are connected to+12V power supply by resistance R17, and terminals S25 is in vacant state, and terminals S26 passes through Resistance R18 ground connection；Common end S21 is connected to one end of the current-limiting resistance R6 inside ECU by the series connection of foot 6, and current-limiting resistance R6 is another The inside for the master chip that end is connected to electronic controller ECU through diode D20 wakes up mouth WAKE UP；Common end S24 is divided by foot 5 One end of the resistance R4 and resistance R5 that are not connected to inside ECU, another master chip for terminating to electronic controller ECU of resistance R4 Modulus acquires switched pins ADC2, general input/output port GPIO2, and the another of resistance R5 terminates to+5V power supply, and foot 5 leads to simultaneously Cross resistance R16 ground connection；Foot 5 become resistance R5 connect with resistance R16 divide midpoint, 5 voltage value of foot by ECU modulus acquisition Switched pins ADC2 is read.

As shown in Figure 1, automatic parking function double control switch circuit M6 includes switch S3, resistance R19~R21, switch S3 tool It is respectively S31, S34 there are two common end, tool is respectively S32, S33, S35, S36 there are four terminals；Common end S31 and wiring S32, S33 constitute single-pole double-throw switch (SPDT) at end, and common end S34 and terminals S35, S36 constitute single-pole double-throw switch (SPDT)；Terminals S32 ground connection, terminals S33 are connected to+12V power supply by resistance R20, and terminals S35 is in vacant state, and terminals S36 passes through Resistance R21 ground connection；Common end S31 is connected to one end of the current-limiting resistance R9 inside ECU by the series connection of foot 8, and current-limiting resistance R9 is another The inside for the master chip that end is connected to electronic controller ECU through diode D30 wakes up mouth WAKEUP；Common end S34 is distinguished by foot 7 One end of the resistance R7 and resistance R8 that are connected to inside ECU, another+5V power supply and electronic controller ECU of terminating to of resistance R7 The modulus of master chip acquires switched pins ADC3, general input/output port GPIO3, and the another of resistance R8 terminates to+5V power supply, foot 7 are grounded by resistance R19 simultaneously；Foot 7 become resistance R8 connect with resistance R19 divide midpoint, 7 voltage value of foot is by ECU's Modulus acquires switched pins ADC3 and reads.

In the utility model, light emitting diode D2, D3 are controlled by EPB ECU, and light emitting diode D1 is by other units of vehicle Control.

In pull-up double control switch circuit M4, common end S11 and terminals S12, S13 constitute first group of single-pole double throw Switch, common end S14 and terminals S15, S16 constitute second group of single-pole double-throw switch (SPDT), and two groups of single-pole double-throw switch (SPDT)s constitute Double-point double-throw switch；Common end S11 and common end S14 are moved synchronously, and are being made of respectively terminals S12 and terminals S15 Switch connection between group of terminals and the group of terminals being made of terminals S13 and terminals S16.

Parking switch in the control of electronic parking system EPB is distinguishingly divided into pull-up dual control and opened by the utility model Three functional switches of powered-down road M4, release movement double control switch circuit M5, automatic parking function double control switch circuit M6, pull-up Movement double control switch circuit M4, release movement double control switch circuit M5, automatic parking function double control switch circuit M6 are respectively used to The identification being intended to is operated to driver, the advantage of design is under the premise of meeting switch required function, and ensures three electricity Road is mutually indepedent, in the failure of some switching circuit, does not cause the signal identification of other switching circuits.

Indicating circuit is divided into three kinds by the utility model simultaneously, respectively backlight lighting circuit M1, EPB movement instruction electricity Road M2, automatic parking function open instruction circuit M3, can prompt which kind of work shape electronic parking system EPB is currently in this way State.

In specific implementation, the master chip of electronic controller ECU uses Freescale MS9S12P128MGK model.

The control switch control method process of the utility model is as follows:

State model 1:

System is under original state (switch is failure to actuate), is controlled triode Q1 by the enabled pin CTR1 of ECU and is closed, EPB action indicator D2 does not work.

Common end S11 is connect with terminals S12, and the one end common end S11 is grounded through terminals S12 at this time, and common end S11 is another One end connects the resistance R3 and diode D10 inside ECU by foot 1.

Common end S14 is connect with terminals S15, and the one end common end S14 is hanging through terminals S15 at this time, and common end S14 is another One end is connected to the midpoint of resistance R2 Yu resistance R13.3 electricity of foot that switched pins ADC1 is read is acquired by the modulus of ECU at this time Numerical value is pressed, the input of ECU identification signal is low.

1, it when driver requests parking, presses and opens switch S1, start electronic parking

It presses and opens switch S1, i.e., S11 becomes attached to the state of S13 from the state for being connected to S12, while by S14 The state of S16 is become attached to from the state for being connected to S15.

A. it controls triode Q1 by the enabled pin CTR1 of ECU to open, EPB action indicator D2 is bright, and display has at this time Parking request；

B.S11 is connected to S13, and the one end S11 is defeated by foot 4 by resistance R14 connection+12V, the S11 other end through S13 at this time Enter the resistance R3 and diode D10 to inside ECU.

While S11 connects S13, S14 connection S16, the 3 voltage number of foot that the switched pins ADC1 of modulus acquisition at this time is read Value reads acquisition ECU by general input/output port GPIO1 at this time and recognizes a trigger signal 1 from low to high.ECU is logical The variation for crossing comparison 3 voltage of foot, recognizes trigger signal 2.

C. the functional safety of switch is realized, ECU will carry out verification comparison to trigger signal 1 and trigger signal 2, when two When trigger signal is due signal under correct parking, then judges that driver there are pull-up EPB switching requirements, prevent single mould False triggering function caused by block fails.

State model 2:

System is under original state (switch is failure to actuate), is controlled triode Q1 by the enabled pin CTR1 of ECU and is closed, EPB action indicator D2 does not work.

Common end S21 is connect with terminals S22, and the one end common end S21 is grounded through terminals S22 at this time, and common end S21 is another One end connects the resistance R6 and diode D20 inside ECU by foot 6.

Common end S24 is connect with terminals S25, and the one end common end S24 is hanging through terminals S25 at this time, and common end S24 is another One end is connected to the midpoint of resistance R2 Yu resistance R16.5 electricity of foot that switched pins ADC2 is read is acquired by the modulus of ECU at this time Numerical value is pressed, the input of ECU identification signal is low.

1, it when driver requests starting vehicle, presses and opens switch S2, starting parking release

It presses and opens switch S2, i.e., S21 becomes attached to the state of S23 from the state for being connected to S22, while by S24 The state of S26 is become attached to from the state for being connected to S25.

A. it controls triode Q1 by the enabled pin CTR1 of ECU to open, EPB action indicator D2 is bright, and display has at this time Release request；

B.S21 is connected to S23, and through S23 by resistance R17 connection+12V, the other end is defeated by pin 6 for the one end S21 at this time Enter resistance R6 and diode D20 into ECU.

While S21 connects S23, S24 connection S26, the 5 voltage number of foot that the switched pins ADC2 of modulus acquisition at this time is read Value reads acquisition ECU by general input/output port GPIO2 at this time and recognizes a trigger signal 3 from low to high.ECU is logical The variation for crossing comparison 5 voltage of foot, recognizes trigger signal 4.

C. the functional safety of switch is realized, ECU will carry out verification comparison to trigger signal 3 and trigger signal 4, when two When trigger signal is due signal under correct parking release, then ECU judges that driver presses switching requirements, prevents single False triggering function caused by Module Fail.

State model 3:

System is under original state (switch is failure to actuate), is controlled triode Q2 by the enabled pin CTR2 of ECU and is closed, Automatic parking functional indicator light D3 does not work.

Common end S31 is connect with terminals S32, and the one end common end S31 is grounded through terminals S32 at this time, and common end S31 is another One end connects the resistance R9 and diode D30 inside ECU by foot 8.

Common end S34 is connect with terminals S35, and the one end common end S34 is hanging through terminals S35 at this time, and common end S34 is another One end is connected to the midpoint of resistance R8 Yu resistance R19.7 electricity of foot that switched pins ADC3 is read is acquired by the modulus of ECU at this time Numerical value is pressed, the input of ECU identification signal is low.

1, it when driver's request automatic parking function, presses and opens switch S3, start automatic parking function

It presses and opens switch S3, i.e., S31 becomes attached to the state of S33 from the state for being connected to S32, while by S34 The state of S36 is become attached to from the state for being connected to S35.

A. it controls triode Q2 by the enabled pin CTR2 of ECU to open, automatic parking functional indicator light D3 is bright, and display is opened Dynamic automatic parking function.

B.S31 is connected to S33, and through S33 by resistance R20 connection+12V, the other end is defeated by pin 8 for the one end S31 at this time Enter resistance R9 and diode D30 into ECU.

While S31 connects S33, S34 connection S36, the 7 voltage number of foot that the switched pins ADC3 of modulus acquisition at this time is read Value reads acquisition ECU by general input/output port GPIO3 at this time and recognizes a trigger signal 5 from low to high.ECU is logical The variation for crossing comparison 7 voltage of foot, recognizes trigger signal 6.

C. the functional safety of switch is realized, ECU will carry out verification comparison to trigger signal 5 and trigger signal 6, when two When trigger signal is due signal under correct starting automatic parking function, then judge that driver starts automatic parking function Can, false triggering function caused by preventing single module from failing.

In specific implementation, each switch contains arousal function, when electronic controller ECU is in suspend mode, by opening The movement of pass exports a pulse triggering signal and is acquired through modulus acquisition switched pins ADC foot by ECU, so that ECU is from suspend mode mould Formula enters normal mode of operation.

A, electronic controller ECU when not working in a dormant state, to reduce itself power consumption, when driver has pull-up When switch S1, trigger signal 1 will be inputted as wake-up signal, so that electronic parking system EPB enters normal operating conditions.

B, electronic controller ECU when not working in a dormant state, to reduce itself power consumption, when under driver by opening When closing S2, trigger signal 3 will be inputted as wake-up signal, so that electronic parking system EPB is in normal operating conditions.

C, electronic controller ECU when not working in a dormant state, to reduce itself power consumption, driver presses lower switch When S3, trigger signal 5 will be inputted as wake-up signal, so that electronic parking system EPB is in normal operating conditions.

With the expansion of EPB function, the generation of automatic parking function needs to switch the corresponding interface of offer.This is practical new The trigger circuit of automatic parking function signal is added in the control switch structure design of type, so that the function of switch is more comprehensively, The blank of automatic parking functionally is filled up.

The design of the control switch of the utility model to the pull-up switch of EPB (electronic parking system), pulls down switch and all adopts With the commutator of independent control.Do not use the movement of a switch that identification is gone to pull up and pull down.Avoid the mistake of a switch Effect causes two signals (pull-up and drop-down) that can not all identify, the safety of user can be more protected under certain operating conditions.

In order to meet EPB switch can wake up EPB controller (wake up EPB refer to vehicle for power saving, so that EPB goes out In power-down state, that is, suspend mode, when driver actions' switch EPB just restores normal operating conditions), the control switch of the utility model A wakeUP line is devised, when the movement of switch, is collected the variation of height point by MCU by this line, so that it may touch Hair EPB ECU enters normal operating conditions (non-battery saving mode).

In addition to above preferred embodiment, for the utility model there are also other embodiments, those skilled in the art can root It is made various changes and modifications according to the utility model, without departing from the spirit of the utility model, should belong to the utility model Range defined in claims.

Obviously, the described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.With Under be to the description only actually of at least one exemplary embodiment it is illustrative, never as to the utility model and its answering With or any restrictions that use.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creation Property labour under the premise of every other embodiment obtained, fall within the protection scope of the utility model.

Claims (2)

1. It include control switch in electronic parking system EPB 1. a kind of control switch circuit for automotive electronic parking system EPB With electronic controller ECU, it is characterised in that:

   The control switch is mainly referred to by backlight lighting circuit M1, EPB movement indicating circuit M2, the unlatching of automatic parking function Show that circuit M3 and three independent double control switch circuits, three double control switch circuits are respectively pull-up double control switch circuit M4, release movement double control switch circuit M5, automatic parking function double control switch circuit M6 are constituted, and in electronic controller ECU Master chip add and be connected with resistance R1~R9, triode Q1~Q3, diode D10~D30；

   Backlight lighting circuit M1 includes current-limiting resistance R10, light emitting diode D1 and decoupling capacitor C1, current-limiting resistance R10, is shone Both ends after diode D1 and decoupling capacitor C1 is sequentially connected in series and connects are grounded, between current-limiting resistance R10 and decoupling capacitor C1 It draws and connects+12V power supply in midpoint；

   EPB movement indicating circuit M2 includes current-limiting resistance R11, light emitting diode D2 and decoupling capacitor C2, current-limiting resistance R11, hair Optical diode D2 and decoupling capacitor C2 are sequentially connected in series, the end ground connection of decoupling capacitor C2, current-limiting resistance R11 after series connection after series connection End connects the collector of the triode Q1 inside ECU by foot 1, and midpoint is drawn between current-limiting resistance R11 and decoupling capacitor C2 Connect+12V power supply；The emitter of triode Q1 is grounded, and the base stage of triode Q1 connects the enabled of the master chip of electronic controller ECU and draws Foot CTR1；

   Automatic parking function open instruction circuit M3 includes current-limiting resistance R12, light emitting diode D3 and decoupling capacitor C3, current limliting electricity Resistance R12, light emitting diode D3 and decoupling capacitor C3 are sequentially connected in series, the end ground connection of decoupling capacitor C3, current limliting after series connection after series connection The end of resistance R12 connects the collector of the triode Q2 inside ECU by foot 2, between current-limiting resistance R12 and decoupling capacitor C3 It draws and connects+12V power supply in midpoint；The emitter of triode Q2 is grounded, and the base stage of triode Q2 connects the master chip of electronic controller ECU Enabled pin CTR2；

   Pull-up double control switch circuit M4 includes switch S1, resistance R13~R15, and switch S1 tool is respectively there are two common end S11, S14, tool are respectively S12, S13, S15, S16 there are four terminals；Terminals S12 ground connection, terminals S13 pass through resistance R14 is connected to+12V power supply, and terminals S15 is in vacant state, and terminals S16 is grounded by resistance R15；Common end S11 passes through The series connection of foot 4 is connected to one end of the current-limiting resistance R3 inside ECU, and the current-limiting resistance R3 other end is connected to electronic control through diode D10 The inside of the master chip of device ECU wakes up mouth WAKE UP；Common end S14 is coupled with resistance R1 and electricity inside ECU by foot 3 Hinder R2 one end, the other end of resistance R1 be connected to the master chip of electronic controller ECU modulus acquisition switched pins ADC1 and The another of general input/output port GPIO1, resistance R2 terminates to+5V power supply；

   Release movement double control switch circuit M5 includes switch S2, resistance R16~R18, and switch S2 tool is respectively there are two common end S21, S24, tool are respectively S22, S23, S25, S26 there are four terminals；Terminals S22 ground connection, terminals S23 pass through resistance R17 is connected to+12V power supply, and terminals S25 is in vacant state, and terminals S26 is grounded by resistance R18；Common end S21 passes through The series connection of foot 6 is connected to one end of the current-limiting resistance R6 inside ECU, and the current-limiting resistance R6 other end is connected to electronic control through diode D20 The inside of the master chip of device ECU wakes up mouth WAKE UP；Common end S24 is coupled with resistance R4 and electricity inside ECU by foot 5 Hinder R5 one end, the other end of resistance R4 be connected to the master chip of electronic controller ECU modulus acquisition switched pins ADC2 and The another of general input/output port GPIO2, resistance R5 terminates to+5V power supply；

   Automatic parking function double control switch circuit M6 includes switch S3, resistance R19~R21, and there are two common ends point for switch S3 tool Not Wei S31, S34, tool there are four terminals be respectively S32, S33, S35, S36；Terminals S32 ground connection, terminals S33 pass through electricity Resistance R20 is connected to+12V power supply, and terminals S35 is in vacant state, and terminals S36 is grounded by resistance R21；Common end S31 is logical One end that the series connection of foot 8 is connected to the current-limiting resistance R9 inside ECU is crossed, the current-limiting resistance R9 other end is connected to electronics control through diode D30 The inside of the master chip of device ECU processed wakes up mouth WAKE UP；Common end S34 by foot 7 be coupled with resistance R7 inside ECU and One end of resistance R8, the other end of resistance R7 are connected to the modulus acquisition switched pins ADC3 of the master chip of electronic controller ECU With general input/output port GPIO3, the another of resistance R8 terminates to+5V power supply.
2. 2. a kind of control switch circuit for automotive electronic parking system EPB according to claim 1, feature exist In: in the pull-up double control switch circuit M4, common end S11 and terminals S12, S13 constitute first group of hilted broadsword pair Throw switch, common end S14 and terminals S15, S16 constitute second group of single-pole double-throw switch (SPDT), and two groups of single-pole double-throw switch (SPDT)s are constituted Double-point double-throw switch；Common end S11 and common end S14 are moved synchronously, and are constituted respectively by terminals S12 and terminals S15 Group of terminals and the group of terminals that is made of terminals S13 and terminals S16 between switch and connect.