CA2042356A1 - Electronic control system for automobile - Google Patents

Abstract

2042356 9104889 PCTABScor01 This invention provides an electronic control system for automobile in which the damping force is maintained without pressing the brake pedal continuously during the automobile stops, the automobile can be started easily after the automobile is stopped on the upward slope and the alarm is generated when braking is difficult during the stop, the parking brake is operated in the braking state and the key is removed while the headlight is turned on.
Furthermore, the braking force for the forward stop on the upward slope and the backward stop on the upward slope can be controlled with the inclination switches (17 and 17').

Description

WO 91/04889 ~ 2 ~ ~ ~ PC~r/K R90/00011 ( :

ELE~TP.O~IC CO~TROL SYSTEM~F~R~AUTOMOBILE

BACKGRDURD DF~THE INYENTION
Field~of~the ~in~vent;ion~
5 ~ :The:;presén ~ Invent~on ~relates - to a control syste- for an automoblle more~partlcul ~ an ~ele~tronlc~c;ontrol~sYsteD~;for`automo ile to co trol~
o c ~I p~a t 1 ke ~

o:~ Description of:the:prior art : : ~
lO~ In ~e al,~ when ~a~dr;ve~wants~to stop~the~autoRoblle~ in driving,~ the auto~obile~br~;~pres8in6~the br~ahe pèdal and~
:c ~ h ~ si~,u~1tan sly~- t ~ ~- p~osit:i~on~-the~ gèa~ n~t~e ne tral~ and~
al, ~ ~ s case, if the ~top imeils~prolon6ed, ~he~
s~to~be -~tired `~ea~s~lly~becaus~e~ the4driver~qust~d ~ At~ he~llmc~ the-efore,~th-~dr~ver opera ~es the~
whi~ch;-causes~ p oble ~ that~the~ ty i ~`rèquired;~a b ttle ti-e tc operate:th-~parkln6~brake.
re,~the:: gé~r transmisslon~is~also required~wh:en the auto~obil~e~
:drives up ~the-u~ rd`~lope.~;so,~i; the~!driver ~ un ~skilled the op ~ation o$
-? ~ ,~the::~lu~ch~ ped~ and~ acceleration:: pedal, tbe~automobi~l~e will be slipped ~dIy,' theYeb~causing~the~dang~r o~ a cortact accident or a rollover cldcnt.~

UM~A~Y~F THE INVENTION
It i~ an~abje~t:~o~ this ~nventian to: overcome the above probleos and ,provide,an ~electron~ic~ cantrol sYste3 ior auta~obilc in ~hich the braking W O 91/04889 PC~r/K R~0/OaO11 ~- 2 ~ 2 - .
force is maintained without pressing the brake pedal contineuosly during the '' stop of automobile, the automobile can be started easily after the stop on the upward slope and the alarm is generated when braking is difficult ~uring the stop, the parking brake is operated in the braking and the key is remoYed while the headlight is lighted on.
To accomplish the above mentioned object, the present inYention is comprisîng ; : ~ ' an electronic: ~alve B for brake or release the auto~obile on the basis .-of the operation of brake solenoid S01 and release solenoid S02;
a ~rake circuit 22 for operating the: brake solenoid S~1 of said :: :
~ ;~èlectronic valYe B;
.
a~rel,ease circuit 20 for ope~ating the release solen~id S02 of said electronic valve B~-~
a stop Iam~ circuit ~3 for turning on a stsp la~p L5 when the auto~obile ';
15; ~ is st~pped;a brake indicating lamp circuit ~ ~or -turning: off or on a brake ndicating la~p L~ to indicate the bra~e state according to the operation of : : ; the stnp lamp circuit 23J
~; a ~ultivibrator ll,,for gene~ating the pulse with a predeter~1ned ~re~uencY;
a bu~zer sound genera~ing circuit 12 ~or generating the alar~ fro~ a buzzer Buzz when the automabile is driven abnor~lly;
a ~peed sensor 5 for sensing whether the autooobile is runnin~ or not;
a runnin~ speed detec-tor 7 for reeeiving the signal ~ro~ khe speed ~5 sen~or 5, de~ectin~ the running speed of the auto~obile and outputting the , ~ !, ' ' W 0 9lJ04889 - ~ a 3~ 2 ~ PC~r/~R9~/Oool signal if the running speed exeeds the predetermined speed;
a charge circuit 26 for charging a condenser-C9 during the auto~obile is stoppe~ according to the signal from said running speed detectnr 7;
a discharging circuit 27 that operates until said con~enser C9 is discharged below the predetermined volta~e while the auto~obile is run according to the signal of said running speed dtetctor 7;
a inclination s~itch 17 that is truned on when the automobile is run on the ground or on the upward slope and turned off when the automobile is an the downward slope ;
a brake deter~inating control circuit 18 for controlling the braking operation of said electronic valYe B according to the signals from the inclinatlon switch 17 and a bra~e pedal switch SW 15 ;
an abnormal release preventing circuit 21 for preventin~ ~n abnor~sl release af the brake ;
~: 15 an OR circuit 24 ~or logic OR operatin~ according to the signals ~ro~
the brake determinating control circuit 18, the release circuit 20 and the abnor~al release preventing circuit 21 ;
a headlight control circuit 6 for turning on or of~ a headlight 13 autamatically according to the signal frsm the running speed detector 7 ;
~0 and~
an abno~al key of~ preventing circuit 8 ~or generating the alar~ in the ~ase of the abnarmal key aff.
hccardln~ to the present inYention canstructed as above ~en-tioned, the braking state, firstl~, is ~aint~ined thou~h the gear is placed in the ~3 neutr~] and the clutch pedal and brake pedal are released when the w 0 91/04889 2 ~ PC~r/K R90/OOOIl automobile is stopped by pressing the clutch pedal and brake pedal.
Secondly, the braking sta~e is maintained though the brake pcdal is released in the state of a foward gear state when the auto~obile is stopped by pressing the clutch pedal and the brake pedal in driving up the ~p~ard slope 5 Thirdly, the braking state is ~aintained though the brake pedal is released in the state of a bac~ward gear when the automobile is stopped by pressin~
the clutch pedal and the brake pedal during driving down the downward slope.
Fourthly, in the state that an automatic headlight switch is turned on, if the head light switch is truned on, the headlight is lighted on in driving, while ~he headlight is lighted off in stopping. ~ifthly, the alaro is ~enerated ~or warning to release parking brake when a driver tends to start ~he automobile while the parking brake is operated. Sixthly, the alar~ i~
generated to turn of~ the headlight and a side light if the key swi$ch is turned off while the headlight a side light a~e turned on, and if a driver operates the stolen preventing switch the robbery of the auto~obile can be pre~ented because the brake release operation will not be perfor~ed.

BRIE~ DESCPvIPTION OF THE ~RAWINGS
Fig.1 is a dlagram showing electronic valve~ lamp and switches connected to ~he system according to an e~bodi~ent of this invention ;
~ig.2 is a circuit diagram accordin~ to an embodi~ent shown in ~ig.l;
Fi~,3 is a dia~ram showing the cross sectional construction of the electronic val~Je.
P1~,4 is a diagra~ showing electronic valve, la~p ~nd ~witches connected ~o th~ systk~ according to an anoth~r em~odiment o~ this invention;

~", ., " , .

W O 91/048~ P~r/~ /0 f~. `, 2 ~ 6 Fig.5 is a circuit diagram according to an another e~bodiment shown in Fig. 4; and, Fig.6 is a diagram shohing the cross sectional construction of the electronic Yalve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIHENTS

Keferring to the diagra~s, thereafter, the preferred ezbodiaent of the invention will be described in detail.
Fig. 1 shows the electronic valves and swithes connected to the syste~
of this invention. In Fig. l, the reference nu~ber B i~ an electronic valve for braking a tire T, 5 is a speed senser for sensing whether the auto~obile is running or not, ~/C is a ~aster cylinder, SW3 is a headli~ht switch, SW4 is an automatic headlight switch, S~5 is an au44~atic SW8 is a start switcb, SW9 is a key svitch, 5W10 is an acceleration pedal switch, SWll is a clutch switch, SW13 is neutral switch, SW14 is a backward switch, SW15 is a brake pedal switzh, L2 i5 a brake indicating la~p, L3 is headlight, L5 is a stop la~p, 1 is a batter~ and 2 is a ground.
Fig. 2 is a diagram showing a circuit concerned with the syste~ of the inven~ion in the Fig 1. In ~ig.2, the reference number 3 indicated with tbe soli~ lines is a li~hting warnin~ circuit, 7 is a running speed detector, ll is a ~ultivibrator, IZ is a buzzer sound generating circllit, 17 is an inclin~tion switch, 18 is a brake determinatin~ control circuit, RLl is a hea~light rela~, RL2 is a ~top lamp relay. RL3 is a re:lease relay, RL4 is a brakin~ relaY~

W 0 91/ M 889- PC~r/K R90/000l1 OJ s~ ~,~
~ 6 -First of all, as shown in Fig. 2 if the key is put in ~he automobile and truned to "onS' , the key switch SW9 is truned on and the power voltage is supplied as shown hith the thick solid lines, and the power voltage is supplied to each circuit, the multi-~ibrator 11 oscillates the predeter~ined frequency and outputs the oscillated sigr,al through a resistor ~25 to turn on and o~f the transistor NT17 with the predeter~ined fequency.
At this time, if the parking brake operates before the automobile is started, the parking brake switch SW2 is truned on and the current is passed througha emitter and a base of transistor PT2, resistor R27, diode D19 and lD parking brake switch SW2 in the braking warning sound generating circuit 19, so that the transistor PT2 is turned on and the voltage is supplied to one end of the buzzer Buzz through a collector of transistor PT2 and diode D45.
Therefore, the Yoltage supplied to said buz~er Buzz is supylied throu~h a collector and an emitter of the transistor N~17 which is turned on and off with~ a predetermined cycle and resistor R44 to a base of transister NT27, : and this transistor NT27 is tarned on and off, thereby said bu~zer Buzz :: ~ounds with the the predetermined frequnecy. Accordingly, the driver can notice that the parking brake is operated and releases the parking breake before bein~ start the automobile.

2~ Nex~, if the key o~ automobile is removed a~ter turning to "start"
te~pararily~ the starte switeh SW8 is turned on and then off and the ~utomobil2 is started a-t that ti~e. On the other hand, the trigger signal i~ supplied to the gate of S~R 13 thrnugh the diode D31 ~nd the resistor R29 as saorl as the start switch ~W8 ia turned on, thereby SCR 13 is turn on.
~5 The current ~hieh passes between an anode and a cathode oP SCRI3, a~ SCR l3 W O 91/04889 PC~r/K R90/00011 ~= 2~ 33 ~

is turned on, is determined by the transistor NT18, na~ely, as above mentioned, most of the current supplied to the base of the transistor NT18 wher, the parking brake is operated passes to the ~round 2 through the resistor ~31, the diode D20 and parking brake switch SW2, so the transistor A'T18 makes to pass the small current to SCR 13. While, i~ the parking brake is not operated the transistor NT18 makes to pass the large current to sca 13 because the current is not passed through said resistor R31, the diode 30 and the parklng brake switeh SW2.
Therefore, the current which is enough to operate the stop la~p relay ID RL2 of the stop light circuit 23 when the automobile is started and the parking brake operation is released passes through said SCR 13, so that the sw~1tch contac~t c of the la~p relay RL2 is connected with a contact a. In this case, the power volta~e from the battery 1 lS supplied to the anode of the diode D42 in :the Buzzer sound generating c~rcuit 12 through the contacts ~: 15c and: b of the release relay RL3 and the contacts c and a of the stop la~p , relay RL2 in the release circuit 20 and is supplied to the stop la~p L5 at he sa~e t1~e, and then the stop la~p L5 is turned on. The power volta~e ~: : is supplied to the condenser C15 through the diode D18, and the condenser C13 is charged.
~0In addition, the voltage supplied to the anode of said dîcde D42 îs : supplied with the predeter~ined volt~ge to the base oi transistor NT28 throu8h the diode D42 and the resistor R4~ so the transistor NT28 is turned ~n and th~ Yol~a~e supplied to the base o~ the ~ransistor NT27 is passed to th~ ~raund 2 throu~h the trasistor NT27. In this ~ay, ~hen the tran~istor ~5 ~T28 is turned on, the transistor NT27 is -~urned o~f s~ that ~he current , .. . . . . . . . . . . .

WO 91iO4889 PCI/KR90/00011 2~,~"æ~

fro~ the emitter of transistor NT17 passes to the ground 2 through the resistor R44 and the transistor NT28. At this time, the resistor R44 has a relatively large resistance value so that small current passed throuh the buzzer Buzz, thereby the bu~er Buzz doesn't sound.
As above mentioned, If the power voltage is supplied to this syste~ in operating the parklng brake, the buzzer BU2Z sounds. Therefore, it is eas~
LO start because the driver hears the warning sound and then releases the parking brake before starting. Next, if the auto~obile is ~oved, the pulse aignal from the speed senser 5 is supplied to the running speed detector 7, the ti~er IC~6) outputs the signal o~ high level(H) through the diode D3 and : this high level signal is supplied to the base of transistor NT2 thr~ugh :: doide D3 and resistor R7, so said transistor NT2 is turned on. In this way, ;if tha transistor NT2 is turned on, the transistor PT1 i3 turned on too.
- When the automobile doesn't move, the Yolta~e char~ed in the condenser C9 1~ ~through the transistor NT3 and the diode D4) is sup~lied to the base of transistor ~T4 through resistor R9 and the transistor NT4 is turned on thereb~ the dri~ing current which passes to the release relay RL3 through s~id transistors PTl, NT4 and the release relay RL3 is operated.
: Accordingly, the contaçt c of the release relay RL3 contacts to the eontact a so that the supply voltage is supplied to the release sulenoid S0~ of the electronic valve B. On the other hand, as aboYe mentin~d ii the contact c o~ the rel~ase relay RL3 conta~ts to the contact a, the slgnal being s~ppplied to the b~e oi the transistor NT18 throu~h the resistor R32 is cut of~, thereby th~ transistor NT18 is turned o~ and SCR 13 and ~he stop lasp 25 rel~ P~LZ ar~ turned O~e to be ligh~ out the stop la~p ~S. Herein, the W O 91/04B89 PC~r/K R9O~OOOll ,~

g _ driving current which passes to said release relay ~L3 is cut o~f if the condenser C9 of the charge circult 26 is discharged less than the predetermined voltage.
Fig. 3 is a diagra~ showing the cross sectional construction of the electronic valve, B in which Fig. 3 (a) shows the cross sectional view at the time of the brake release state and the Fig. 3 (b) shows the cross sectional view in braked state. In the diagra~s, the relerence nuober Y1 ia the outlet plug, V2 is a small spring, Y3 is a body of the valve, Y4 is a plunger, V5 is an insulator, V6 is a s~all ~alve stopper, V7 is a large valve, V8 lS a small valve passage, V9 is a large valve rubber, Y10 is a lagre spring, Vll Is an inlet plug, SD1 and S02 are brake snlensid and release solenoi~ as shown in Fl~. 2.
The inlet plug Y11 is connected the brake ~aster cylinder throu~h a pipe ~ and the outlet plug Y1 is connected through ~he pipe to the wheel cylinder :: 15 on the tire. In this case the electronic valve cuts off or flo~s the fluid bet~een said brake master cylinder and the wheel cylinder so that the braking and r~leasing operation can be perfor~ed. That is to say, as sh~n in Fig. 3 ~b) if the current passes to the braking solenoid SD1 to brake the auto~obile, the large valve Y7 ~oves to the right by the electro~a~etic "
Z0 ~orce and the path îs cut o~f to perfor~ the brake. When the current p~se~ to ~h~ release solenoid S02 ~or releasing the brake a~ sho~n in Fig.

3 (a), th~ plunger V4 is drawn, up to the left by the electro~agnetic ~orce so that the s~ull valve stopper connected ~ith -the plange is dra~n, the smal~ val~e passage Y~ opens firs~. AccordinglY, the lar~e valve Y7 ~oves 25 to the le~t and th~ p~ss,age opens to release the brake.

s, .. .
: , w o 91~04889 PC~rtK R90/V0011 æ3~ r~
- 10 - :
In this wa~, the braking state is maintained though the clutch pedal and brake pedal are released after the brake pedal and the clutch pedal are pressed simultaneollsl~ and the gear is placed in the neutral because of the stop in driving. That is, if the brake pedal and the clutch pedal are pressed, the braking pedal switch S~15 and the clutch switch SWll are turned on so that the volage is supplied to the stop la~p L5 throu~h the braking pedal switch SW15 and the stop lamp L5 is lighted out. Further~ore, the predetermined voltage is supplied to the base of transistor NT26 through the brakin~ pedal shitch SW15 and the resistor R42 to trun on the tr~nsistor ~T26.
Meanwhile, when the automobile lS stopped as abave ~entioned, the transistor NT2 of the running speed detector 7 is turned off and the transistor NT3 is turned on, thereby the current passes to an auto~atic braking switch SN5, an emitter and a base of ~ransistor PT3, resistor R33, diode D34 and clutch switch SW11 and transistor PT3 is turned on. As the neutral shitch SW13 is turned on, the~current passed through trans}stor PT3, brake rela~ RL4, transistor NT26, transistor PT4 and diode, so the brake :~- relay is operated.
If the brake relay,RL4,is oper,ated as above mentioned, the contact c is connected with the contact a of the brake relay RL4, the po~er voltage is supplied to the brake solenoid S01 o~ the valve B through the contacts c and b of the release relay RL3 and the contacts c and a of the brake relay eL4 to be a~complished the braking operation.
Furthermore, the voltage passed throulh the contacts c and a of the brake rela~- RL4 makes to be turned on the SCR 13 through the diode D21 and WO 91/04889 2 ~ ~ 2 3 ~ ~ Pcr/KR90/oool 1 ~

.. ~

the resistor R26 so that the stop la~p relay RL2 is operated with the current hhich passes through the transistor NT18. Accordingly, the contact C of the stcp lamp relay RL2 is connected with the contact a, the po~er voltage is supplied to the condenser C15 through the oontacts c and b of the release relay RL3, the contacts c and a o~ the stop la-p relay RL~ and the dlode D18, and then the condenser C15 is charged. However, because the voltage charged in the condenser C15 is grounded through the resistor R30, the doide D25, the resistor R34, the transistor NT20~ the diode D33 or D32 and the clutch switch SW11 or the neutral switch SW13, thereby the current 19 doesn't flo~ through the release relay RL3 and the braked state can be maintained.
In this way, though the clutch pedal is released on placing the gear in the neutral posltion, the release relay RL~ does't operate. ~urther-ore, if the ~rake pedal is released, the current ~hich flows to the brake relay -15 P,L4 is cut off, but the braking force can be maintained as it was. That is, f the current once flows and is cut o~f to any one sid~ of the brake solenoid S01 and tùe release solenoid S02, the state as above ~entioned can be maintained until the current flows to the other side of the solenoid.
~ As above entioned, according, to the syste~ of this invention, the braking state is maintained though the clutch pedal and brake pedal are ;~ released after the clutch pedal and brake pedal is pressed and the gear are placed In the neutral position, so the driver doesn't have to devote unnecessary energy to brake the auto~obile.
During the stop like the avove, if the driver draws the parking brake ; 25 for parkin~, the parking brake switch SW2 beco2es on state and the signal w o gl/04889 pr~r/K RgO~oool 2 ~ 2 3 ^~ 12 -~hich is supplied to the base of the transistor NT28 in the Buzzer sound generating circuit 12 is supplied to the ground 2 through the diode D43 and the parking brake shitch SW2 so that the transistor NT28 is turned off and the buzzer Buzz sounds. Accordingl~, the driver doesn't have to draw the 5 parking brake even when the driver wants to park because can notice that the brake operation has been performed already.
Next, the operation of the system according to this invention, in case of dri-ing up the automobile to the upward slope, will be descrived. In the ~ig. 2 the inclination switch 17 is operated depending on the inclination of the front and the rear of the auto~obile. At this ti~e the steelbail 15 is placed on the position shown with the dotted lines in the case of the ground or the upward inclination and placed on the position shown with the solid lines in the case o~ the downward inclination. That is, when the automobile is driven up the inclinatio~, the steelball lS is placed on the position shown with the dotted lines so that the light ~roo the LED
14 is received in the phototransistor 16 and this phototransistor 16 is turned on.
In this way, under the inclinaion switch 17 is turned on and when the automobile is stopped for a while because of the gear transnission in driving up the inclination(the ~orward gear), the clutch pedal and brake pedal are pressed sinultaneouly. At that tioe if the brake pedal switch SW15 is turned on and predetermined signal is supplied to the base of transistor NT26 is turned on, and then the voltage froo the phtotransistor 16 of said inclinaion switch 17 is supplied to the base of transistor NT25 through the resistor R41 and the transistor NT25 is turned on so that brake W O 91/04889 PC~r/K R90/00011 ~ 13 ~ 3 6 relay RL4 of the brake circuit 22 is operated.
Therefore, as the power voltage is supplied to the brake solenoid S01 of the valve B throu~h the contacts c and b of the release relay RL3 and the contacts c and a of the brake relay RL4, the brake operation is perfor~ed and the SCR 13 is turned on at the same time then the stop la~p relay RL2 is operated. Thus, the stop lamp L5 is turned on the the condenser C15 ~f the release circuit 20 is charged. Alternatively, the release operation can't be performed because the voltage charged in the condenser C15 is discharged through resistor R30, diode D25, resistor R34, transistor NT20, diode D33 and clutch switch SWI1.
As above ~enioned, when the automobile is stopped by pressing the clutch pedal and brake pedal in driving up the upward slop, the braking ~orce is ~aintained so far as the clutch pedal is not to be relea~ed thou~h the brake pedal is released without placing the gear in ~he neutral position. In ~his way, as the driver transmits the gear, releases the clutch pedal to start ~nd presses the acceleration pedal, the clutch switch SWll is turned o~f, thereby the current doesn't ~low through the diode D25 of abnor~al release preventin~ cireuit 21, while the volta~e charged in the condenser C15 is supplied to the base of the transistor NT19 through the resisto~ R30 2~ so that the transistor NT19 is turned on. Therefore, the release relay RL3 is operated and the power voltage is supplied to the release solenoid sn~ of ~he Yalve æ through the contac~s c and a of the release relay RL3 so that the braked state is released and the autooobiles con be started at once.
On the o~her h~nd, when the clutch pedal and the brake pedal are pre3sed ~5 si~ult~neou~ly on upward inclination like the aboYe, the gear is placed in W O 911048B9 PC~r/K R90/00011 ,~
~ 3~6 - 14 -~:
the backward and the brake pedal and clutch pedal are released, the automobile is moved to backward because the brake operation in not ~o be performed. That is, if the gear is Placed in the backward, the backward switch S~14 is turned on and the predetermined voltage is supplied to the base of the transistor NT24 through the switch SWl4 and the resistor R39 to be turned on the transistor NT24.
According1J, most of the currents which are supplied to the base of :transistor NT25 throogh the phototransistor 16 and reslstor R41 pass to the ground 2 through the diode D40 ~ and the transistor NT24 and then the transistor NT25 is turned off, thereby the current path being drived the . .
brake:relay RL4 by :the transistor NT26 and the transistor NT25 isn't ~or~ed and the brake operation can1t be per~or~ed.
extJ the ~operatlon of the system according to:this Invention, when the : automobile is:drived on the downward slope, whi~l be~ described. In that ~-15 ~ :case,~as the steelball 15 of the inclination switch 17 1S placed in the posltion shohn with the solid lines, the light frc~ the LED 14 can't be ~ :
recéived-in thé photodiode l6 so that this phtodiode 16 is turned o~f.
nder such a condition, if the clutch pedal and the brake pedal are -: pressed si~ultaneously to stop the auto~obile ior a while driving the ~0 downward slope, the clutch sw~tch SWll and the brake pdeal switch S~15 are turn2d an, At that time, ii the ~ear is pleaced in the backward and the brake pedal and the clutch pedal are released, the br~ked state can be ~alntalned. That is to say~ ii the ~ear is placed in the b~ckw~rd, the ~ack~ard switrh SWl4 is turned on and the backward la~p L4 is turned on and a~ the sa~e ~i~e the power vol~aBe is supplied to the base o~ transistor w o 91/04889 Pc~r/~90/~OOll . 2 ..~ - ~
..

~T22 through the resistor R~8 as a predetermined si~nal, so that the transistor NT22 is turned on and the brake relay RL4 is operated as a predetermined signal is supplied to the base of transistor NT26 through the brake pedal sh~itch SW15 and the resistor R42 and the transistor NT26 is turned on. Accordlngly, the power voltage is supplied to the brake soleniod SO1 of the valve B so as to perform the brake operation.
On the other hand, in case of stop the automobile by pressing the clutch pedai and ~the brake;pedal ln downward inclination as above ~entioned and if the gear is placed in the forward, the brake operation can't be perforoed though the clutch pedal and the brake pedal are released. That is, if the brake pedal is pressed, the brake swich SW15 is turned on, and the sop la~p .
L5 ls turned on and the transistor NT26 is turned on. Ho~ever, because &11 of the transistsrs (NT25, NT24, NT22, PT4) are off, the brake relay RL4 can't be operated. Further~ore, because t~e clutch switch SW11 becooes ~"onJ' i n the braked state like the above, the voltage charged in the condenser C15 is grounded through resistor R30, diode D25, resistor R34, transistor ~T20, diode 33 and clutch switch SW11 so that the release relay P.L3 don~t be operated, Therefore, in this condition i~ the release pedal and the clutch pedal are released, the automobil~ can be started at once.
In every condition as mentioned above, if the autooobile is started and is m~oved with the predetermined speed, the transistor ~T2 o~ the running speed de~ctor 7 is turned un and the transistor NT3 is turned off. In thls way~ if the transistor PT1 is turned on and the voltage charged in the c~ndenser C~ is supplied to the base o~ transistor NT4 through the resistor R0 as ~ prede~ermin~d signal, then the transistor NT4 is turned on and the W O 91/04889 PC~r/KRgO/ooOl ~ Sd ~ 16 -po~er voltage is supplied to the release relay RL3 so that this release relay EL3 is operated. Therefore, the release operation is per~orDed as the pher voltage is supplied to the release solenoid sn2 of the valve Meanwhile the time required for being supplied the voltage to the release solenoid S02 is continued until the condenser C9 is discharged with a predetermined voltage. This operation is for confor~ing the brake release during the automobile's running.
Nex~t, in Fig 2, it will be described that the brake operation is .
performed by pressing the one-toutch switch S~7 during runnig the automoblle in state "off" the auto~atio brake switch SW5. The one-toutch switch Sh'7 is tc supply the signal to performe the brake operation when the speed senser 5 or the running speed detector 7 is out of order and in an e~ergency.
The driver is try to stop the automobile Dy pressing the clutch pedal and the brake pedal when the conditions like the abpve occur. At this tioe, if 15~ ~thé~ one-toutch switch SW7 is pr ssed, when the transistors NT28 and, NT25 are state "on" in the way of driving up the upward slope like the aboYe, the v~ltage is supplied to the brake relay RL4 so that the brake rel~y eL4 is operated and the brake operation is performed.
And, i~ the brake relay RL4 is operated, a predeter~ind signal is ,, , !
2~ supplied to the ~ase o~ transistor NT29 through resistor R46 of the brake indicating lamp circuit ~ to turn on the transistor NT29. Further~ore, the stop lamp relay RL2 is aperated when the brake relay RL4 is operated and the pr~determined si~nal ls supplied to the base o~ the transistor NT5 ~hrough the con~acts c and a o~ the stop la~p relay RL2 and the transistor NTS is opera~ed. There~ore, the transistor NT12 and the transistor NT13 are turned W O 91/04889 P(~r/KR90/000 17 ~ ~ ~ 3~

on and the brake indicating lamp L2 is lighted on. Because the transistor ~T14 is turned on an~ off with predeter~ined frequency according to the signal of the multivibrator 11, the signal supplied to the ~ase of transistor ~T13 is grounded periodicallY through diode D4, transistor NT14 and transistor NT29 so that the brake indicating la~p L2 flickers with the predetermined period. Accordingly, the driver can notice that the current flo~s in the brake solenoid S01.
According to the syste~ of this inYention, if the headlight switch SW3 is turned on during running the ~utomobile, the transistor NT6 is turned on, the transistor NT2 of the running speed detector 7 is turned on and the transistor ~T3 is turned off. Therefare, as the voltage don't be supplied to the~ head1ight relay RL1 through the transistor NT3 and the auto~atic ~ headlight shitch SW4, the headlight relay RL1 can't be operated so that : headlight L3 is lighted on. Further~ore, in ~ase of the auto~obile stops, the transistor NT2 Q~ the running speed detector 7 is turned off and the ~: transistor ~T3 is turned on. AccordinglY. if the power voltage is supplied to the headlight relay RL1 through the transistor NT3 and the ~uto~atic -~ headlight switch S~4, the contact c of the headlight relay RL1 is connected with the contact a so that the headlight L3 is lighted out. In this way, 2~ when the automatic headli~ht switch SW4 is turned on an~ the headlight switch SW3 is turned on alsa, ii the auto~obile is stopped the headlight L3 is li~ht out, and i~ ~he automnbile is runed the headlingh L3 is lighted on In addition, a~cordin~ to the system of this invention, if the key is removed when the side light switch SWl beco~es on(the state o~ the side Z~ ht is lighted), the warnin~ saund is generated. That is, because the 4~89 ~ PCI/KR90/00011 ~-predeter~ined voltage is supplied to the base of the ~rans1star HT10 in the abormal key off preYenting circuit 8 through the resistor R13 when the key sh~itch SW9 is turned on and the transistor NT10 is turned on, the si~nal ;
which is supplied to the base of the transistor NT9 is grounded through 5 diode Dll and transistor NT10, and then the transistor NT10 turned off.
However, if the automobile key is taken off, the key switch SW9 is turned off and trans1stor NT10 is turned off so th~t the transistor NT9 is turned on, with result that the transistor NTll is turned on. In this way, a samll currents from the e~itter of said transistor NTll ~akes the transistcr turned on through the resistor R15, ~ost of the currents flows the diode D13 and the transistor NTll and the buz~er Bu~ generates the sound.
~:Accord1ng to the syste~ of this invention, if the parking brake switch SW~;is turned on, aiter ~aking the key switch SW9 be turned on or o~ the-curren~t flows through the release solenoid sq~ and the brake operation is ::released, That is, ii the key switch SWg is turned off while th parking brahe switch SW2 is turned an, the transistor NT7 of the brake release :circuit 10 ior releasin~ the braked state is turned oif and the transistor T3 turned on. Thus, the voltage ch~rged in condenser C15 is supplied to the base of ~he transistor NTl9 through the resistor R30 as a predeter~ined si~nal, Accordingly, as the release solenoid S02 of the valve B is operated when the curr~nt ilows throu~h it, the current which passed throu~h the release soleniod S02 is cut oI~ ii the condenser C15 b~co~cs b~low :predeter~ined volta~e.
Purthermore, in the syste~ according to this invention has the stolen 2s preYenting swit~hes SWB and SW12. I~ the switches S~ and SWl~ are turned i ~, , i . , W O 91/04889 PC~r/K ~90/00011 t',"`, ~323~ :
- 19 - ~"
on in the parking state, the current flows through the brake solenoid S01 for the predetermined time so that the brake operation is per~or~ed and the release operation is cut off.
Referring to Fig. 4 to Fig. 6, now, the control syste~ according to an another embodiment for this invention will be described. The difference of an embodiment shown In Fig. 4 to Fig. 6 co~paring with the aforeQentioned embodiment are that the inclination sw~tch 17 shown in Fig. 2 is divided into the first inclination switch 17' and the second inclination switch 17(see to Flg. 5), and that a cut off circuit 51 is comr~sed additionally.
: That is, in Fig 5, the inclination switch 17 and 17' operate according to the~ foreward and backward inclination degree of the autooobile and a steel ba11s 15 and 15 move to trans~er or cut off the light as the ~automobl:le ~is running on~ the ground, upward slop or down~ard ~lop ~nd the ~ , .
: ~ : circui:t per~orms a given ~unction. Herein, the ~nclination s~itch 17 uses to ; 15 operate the circuits in running the auto~ile backwardly and upwardly, ~hile : - .
inclination swtch 17' uses to cpe~ate the circuits in running the auto~bile ~orewardly and upwardly. The description in detail of present embodi~ent based on this operation is o~itted because it is si~ilar to that of said embodi~ent, ~ 2~ Also, this inYention can be ~odi~ied varously not defined to :~ a~ore~entioned embodi3ents if it isn'~ derive ~ro~ the conception o~ the fnven~ion~ For example, although the circuit o~ this invenion is coaposed a~ the eleoents such as transistcr, resistor and condenser, it ~ay cooposed ~lth using the lo~ic circuit oi the low con~u~ption po~er or the custoo IC.
Accordin~ to the inv~ntion as ~bove oentioned, the br~king state, ,., ,,, ,, ,,, ~,,~ . , , ~

W O 91~04889 PC~/K R90/00011 s~ d S - 2~

firstly, is maintained thou~h the gear is placed in the neutral an~ the olutch pedal and brake pedal are released when the automobile is stopped by pressing the clotch pedal and brake pedal. Secondly, the braking state is maintained though the brake pedal is released in the state of a foward ~ear state when the automobile is stopped by pressing the clutch pedal and the brake pedal in driving up the upward slope. Thirdly, the braking state i~
~aintained though the brake pedal is released in the state o~ a backward gear when the autoDobile is stopped by pressing the clutch pedal and the brake pedal during driving down the downward slope. Fourthly, in the state lD that an auto~atic headl1ght switch is turned on, if the head ligh$ ~witch is ; truned ooj the headlight is lighted on in driYing, ~hile the headlight is lighted off in stopping. Fifthly? the alaro is generated for warrning to : be release parking brake when a driver tends to start the auto~obile ~thile , the parking brake is ope~ated. Sixthly, the ~lar~ is generated to turn o~i : 15: the headlight a side light if the key switch is turned o~f while the : headlight a ~ side ll~ht are turned on, and if a driver operates the stolen ;~

p~eventin~ swltches the robbery of the automobile can be prevented be~ause ~ : ~
~ : ~ the brake release operation will not be perfor~ed. Also i~ a driYer :~ ~ operates the stalen preYenting switch the robbery of the auto~obile can be : 20 preYented because the brake release operation will not be perfor~ed~ a~d if :: the stolen preventing circuit is cperated, the brake release operation can't be ~er~or~ed a~$er the brake operation was per~or~ed therehy resultin~ the :~ ~dvanta~es that the automobile can be prevented ~roo being stolen and convenient drivi~ can be possible are acquired.
2g ~,i. -,, , . . , , ~ ,

Claims (6)

WHAT IS CLAIMED IS :

1. An electronic control system for automobile is comprising an electronic valve B for brake or release the automobile on the basis of the operation of brake solenoid SO1 and release solenoid SO2;
a brake circuit 22 far operating the brake solenoid SO1 of said electronic valve B;
a release circuit 20 for operating the release solenoid SO2 of said electronic valve B;
a stop lamp circuit 23 for turning on a stop lamp L5 when the automobile is stopped;
a brake indicating lamp circuit 9 for turning off or on a brake indicating lamp L2 to indicate the brake state according to the operation of the stop lamp circuit 23;
a multivibrator 11 for generating the pulse with a predetermined frequency;
a buzzer sound generating circuit 12 for generating the alarm from a buzzer Buzz when the automobile is driven abnormally;
a speed sensor 5 for sensing whether the automobile is running or not;
a running speed detector 7 for receiving the signal from the speed sensor 5, detecting the running speed of the automobile and outputting the signal if the running speed exeeds the predetermined speed;
a charge circuit 26 for charging a condenser C9 during the automobile is stopped according to the signal from said running speed detector 7;
a discharging circuit 27 that operates until said condenser C9 is discharged below the predetermined voltage while the automobile is run according to the signal of said running speed dtetctor 7;
a inclination switch 17 that is truned on when the automobile is run on the ground or on the upward slope and turned off when the automobile is on the downward slope ;
a brake determinating control circuit 18 for controlling the braking operation of said electronic valve B according to the signals from the inclination switch 17 and a brake pedal switch SW 15 ;
an abnormal release preventing circuit 21 for preventing an abnormal release of the brake ;
an OR circuit 24 for logic OR operating according to the signals from the brake determinating control circuit 18, the release circuit 20 and the abnormal release preventing circuit 21 ;
a headlight control circuit 6 for turning on or off a headlight 13 automaticlaly according to the signal from the running speed detector 7 ;
and, an abnormal key off preventing circuit 8 for generating the alarm in the case of the abnormal key off.

2. A control system for automobile according to claim 1, wherein said inclination switch 17 comprising a LED 14, a steel ball 15 and a phototransistor 18.

3. A control system for automobile according to claim 2, wherein said steel ball 15 is arranged between the LED 14 and the phototransistor 16 and transfers or cuts off the light of the LED 14 to the phototransistor 16 by moving according to the inclination degree in the running of automobile.

4. An electronic control system for automobile is comprising an electronic valve B for brake or release the automobile on the basis of the operation of brake solenoid SO1 and release solenoid SO2;
a brake circuit 22 for operating the brake solenoid SO1 of said electronic valve B;
a release circuit 20 for operating the release solenoid SO2 of said electronic valve B;
a stop lamp circuit 23 for turning on a stop lamp 15 when the automobile is stopped;
a brake indicating lamp circuit 9 for turning off or on a brake indicating lamp L2 to indicate the brake state according to the operation of the stop lamp circuit 23;
a multivibrator 11 for generating the pulse with a predetermined frequency;
a buzzer sound generating circuit 12 for generating the alarm from a buzzer Buzz when the automobile is driven abnormally;
a speed sensor 5 for sensing whether the automobile is running or not;
a running speed detector 7 for receiving the signal from the speed sensor 5, detecting the running speed of the automobile and outputting the signal if the running speed exeeds the predetermined speed;
a charge circuit 26 for charging a condenser C9 during the automobile is stopped according to the signal from said running speed detector 7;
a discharging circuit 27 that operates until said condenser C9 is discharged below the predetermined voltage while the automobile is run according to the signal of said running speed dtetctor 7;
the first inclinaiton switch 17' operating by cutting off of the light when the automobile is running on the slop forewardly and upwardly ;
the second inclination switch 17 operating by transmitting at the light when the automobile is running on the slop backwardly and upwardly ;
a brake determinating control circuit 18 for controlling the braking operation of said electronic valve B according to the signals from the inclination switch 17 and a brake pedal switch SW 15 ;
an abnormal release preventing circuit 21 for preventing an abnormal release of the brake ;
an OR circuit 24 for logic OR operating according to the signals from the brake determinating control circuit 18, the release circuit 20 and the abnormal release preventing circuit 21 ;
a headlight control circuit 6 for turning on or off a headlight 13 automatically according to the signal from the running speed detector 7 ;
and, an abnormal key off preventing circuit B for generating the alarm in the case of the abnormal key of.

5. A control system for automobile according to chaim 1, wherein said first inclination switch 17' is comprised in which when the automobile is running forewardly and upwardly a steel ball 15 moves according to the inlination degree so that a phototransistor 16 can't receive the light from a LED 14 and the phototransistor 16 is turned off.

6. A control system for automobile according to claim 1, wherein said second inclination switch 17 comprises in which when the automobile is running downwardly and unwardly a steel ball 15 moves according to the inclination degree 90 that a phototransistor 16 can receive the light from a LED 14 and the phototransistor 16 is turned on.