WO1991004889A1

WO1991004889A1 - Electronic control system for automobile

Info

Publication number: WO1991004889A1
Application number: PCT/KR1990/000011
Authority: WO
Inventors: Jung Yong Ha
Original assignee: Kia Motors Corporation
Priority date: 1989-09-28
Filing date: 1990-09-28
Publication date: 1991-04-18
Also published as: EP0445282A1; CA2042356A1

Abstract

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

ELECTRONIC CONTROL SYSTEM FOR AUTOMOBILE

BACKGROUND OF THE INVENTION

Field of the invention The present invention relates to a control system for an autoβobile, more particulaly, to an electronic control systei for automobile to control an electronic valve, lamp and the like.

Description of the prior art In general, when a driver wants to stop the automobile in driving, the driver is bound to stop once the automobile by pressing the brake pedal and clutch pedal simultaneously, then positions the gear in the neutral and releases the clutch pedal. In this case, if the stop time is prolonged, the driver tends to be tired easily because the driver must devote energy to press the brake pedal. At the time, therefore, the driver operates the

parking brake, which causes the problem that the mobility is decreased because it is required a little time to operate the parking brake.

Furthermore, the gear transmission is also required when the autoβobile drives up the upward slope, so if the driver is un skilled the operation of the clutch pedal and acceleration pedal, the automobile will be slipped backwardly, thereby causing the danger of a contact accident or a rollover accident.

SUMMARY OF THE INVENTION

It is an object of this invention to overcome the above problems and provide an electronic control system for automobile in which the braking 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 during

the stop, the parking brake is operated in the braking and the key is

removed while the headlight is lighted on.

To accomplish the above mentioned object, the present invention is

comprising ; an electronic valve B for brake or release the automobile on the basis

of the operation cf brake solenoid SOI and release solenoid S02;

a brake circuit 22 for operating the brake solenoid SOI of said

electronic valve B;

a release circuit 20 for operating the release solenoid S02 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 Stf 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 8 for generating the alarm in the

case of the abnormal key off.

According to the present invention constructed as above mentioned, the

braking state, firstly, is maintained though the gear is placed in the neutral and the clutch pedal and brake pedal are released when the automobile is stopped by pressing the clutch pedal and brake pedal.

Secondly, the braking state is maintained though the brake pedal is released

in the state of a foward gear 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 is maintained though the brake pedal is released

in the state of a backward gear when the automobile is stopped by pressing

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 the headlight is lighted off in stopping. Fifthly, the alarm is generated for warning to release parking brake when a driver tends to start

the automobile while the parking brake is operated. Sixthly, the alarm is

generated to turn off the headlight and a side light if the key switch is turned off while the headlight a side light are turned on, and if a driver

operates the stolen preventing switch the robbery of the automobile can be

prevented because the brake release operation will not be performed.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig.l is a diagram showing electronic valve, lamp and switches connected

to the system according to an embodiment of this invention ;

Fig.2 is a circuit diagram according to an embodiment shown in Fig.l;

Fig.3 is a diagram showing the cross sectional construction of the

electronic valve.

Fig.4 is a diagram showing electronic valve, lamp and switches connected

to the system according to an another embodiment of this invention; Fig.5 is a circuit diagram according to an another embodiment shown in Fig. 4; and,

Fig.6 is a diagram showing the cross sectional construction of the

electronic valve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to the diagrams, thereafter, the preferred embodiment of the

invention will be described in detail. Fig. 1 shows the electronic valves and swithes connected to the system

of this invention. In Fig. 1, the reference number B is an electronic valve for braking a tire T, 5 is a speed senser for sensing whether the automobile

is running or not, M/C is a master cylinder, SW3 is a headlight switch, SW4

is an automatic headlight switch, SW5 is an automatic SW8 is a start switch,

SW9 is a key switch, SW10 is an acceleration pedal switch, SW11 is a clutch switch, SW13 is neutral switch, SW14 is a backward switch, S 15 is a brake

pedal switch, L2 is a brake indicating lamp, L3 is headlight, L5 is a stop

lamp, 1 is a battery and 2 is a ground.

Fig. 2 is a diagram showing a circuit concerned with the system of the invention in the Fig. 1. In Fig.2, the reference number 3 indicated with the

solid lines is a lighting warning circuit, 7 is a running speed detector, 11

is a multivibrator, 12 is a buzzer sound generating circuit, 17 is an

inclination switch, 18 is a brake determinating control circuit, RL1 is a headlight relay, RL2 is a stop lamp relay, RL3 is a release relay, RL4 is a

braking relay. First of all, as shown in Fig. 2 if the key is put in the automobile and truned to "on" , the key switch SW9 is truned on and the power voltage is

supplied as shown with the thick solid lines, and the power voltage is

supplied to each circuit, the multivibrator 11 oscillates the predetermined

frequency and outputs the oscillated signal through a resistor R25 to turn

on and off the transistor NT17 with the predetermined 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

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 voltage supplied to said buzzer Buzz is supplied through a

collector and an emitter of the transistor NT17 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 buzzer Buzz

sounds with the the predetermined frequnecy. Accordingly, the driver can

notice that the parking brake is operated and releases the parking breake

before being start the automobile.

Next, if the key of automobile is removed after turning to "start"

temporarily, the starte switch SW8 is turned on and then off and the

automobile is started at that time. On the other hand, the trigger signal

is supplied to the gate of SCR 13 through the diode D31 and the resistor R29

as soon as the start switch SW8 is turned on, thereby SCR 13 is turn on.

The current which passes between an anode and a cathode of SCR13, as SCR 13 is turned on, is determined by the transistor NT18, namely, as above mentioned, most of the current supplied to the base of the transistor NT18

when the parking brake is operated passes to the ground 2 through the

resistor R31, the diode D20 and parking brake switch SW2, so the transistor NT18 makes to pass the small current to SCR 13. While, if the parking brake

is not operated the transistor NT18 makes to pass the large current to SCR

13 because the current is not passed through said resistor R31, the diode 30

and the parking brake switch SW2.

Therefore, the current which is enough to operate the stop lamp relay

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

switch contact c of the lamp relay RL2 is connected with a contact a. In this case, the power voltage from the battery 1 is supplied to the anode of

the diode D42 in the Buzzer sound generating circuit 12 through the contacts

c and b of the release relay RL3 and the contacts c and a of the stop lamp

relay RL2 in the release circuit 20 and is supplied to the stop lamp L5 at the same time, and then the stop lamp L5 is turned on. The power voltage

is supplied to the condenser C15 through the diode D18, and the condenser

C15 is charged.

In addition, the voltage supplied to the anode of said diode D42 is supplied with the predetermined voltage to the base of transistor NT28

through the diode D42 and the resistor R45, so the transistor NT28 is turned

on and the voltage supplied to the base of the transistor NT27 is passed to

the ground 2 through the trasistor NT27. In this way, when the transistor NT28 is turned on, the transistor NT27 is turned off so that the current from 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 buzzer Buzz doesn't sound.

As above mentioned, if the power voltage is supplied to this system in

operating the parking brake, the buzzer Buzz sounds. Therefore, it is easy

to start because the driver hears the warning sound and then releases the parking brake before starting. Next, if the automobile is moved, the pulse

signal from the speed senser 5 is supplied to the running speed detector 7,

the timer IC(6) outputs the signal of high level(H) through the diode D3 and

this high level signal is supplied to the base of transistor NT2 through

doide D3 and resistor R7, so said transistor NT2 is turned on. In this way,

if the transistor NT2 is turned on, the transistor PT1 is turned on too. When the automobile doesn't move, the voltage charged in the condenser C9

(through the transistor NT3 and the diode D4) is supplied to the base of

transistor NT4 through resistor R9 and the transistor NT4 is turned on thereby the driving current which passes to the release relay RL3 through

said transistors PT1, NT4 and the release relay RL3 is operated.

Accordingly, the contact c of the release relay RL3 contacts to the contact a so that the supply voltage is supplied to the release solenoid S02 of the

electronic valve B. On the other hand, as above mentined if the contact c

of the release relay RL3 contacts to the contact a, the signal being

suppplied to the base of the transistor NT18 through the resistor R32 is cut

off, thereby the transistor NT18 is turned off and SCR 13 and the stop lamp

relay RL2 are turned off to be light out the stop lamp L5. Herein, the driving current which passes to said release relay RL3 is cut off if the

condenser C9 of the charge circuit 26 is discharged less than the predetermined voltage.

Fig. 3 is a diagram 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 diagrams, the reference number VI

is the outlet plug, V2 is a small spring, V3 is a body of the valve, V4 is a

plunger, V5 is an insulator, V6 is a small valve stopper, V7 is a large

valve, V8 is a small valve passage, V9 is a large valve rubber, V10 is a lagre spring, Vll is an inlet plug, SOI and S02 are brake solenoid and

release solenoid as shown in Fig. 2.

The inlet plug Vll is connected the brake master cylinder through a pipe

and the outlet plug VI is connected through the pipe to the wheel cylinder on the tire. In this case the electronic valve cuts off or flows the

fluid between said brake master cylinder and the wheel cylinder so that the

braking and releasing operation can be performed. That is to say, as shown

in Fig. 3 (b) if the current passes to the braking solenoid SOI to brake the

automobile, the large valve V7 moves to the right by the electroβagetic

force and the path is cut off to perform the brake. When the current

passes to the release solenoid S02 for releasing the brake as shown in Fig.

3 (a), the plunger V4 is drawn, up to the left by the electromagnetic force so that the small valve stopper connected with the plange is drawn, the

small valve passage V8 opens first. Accordingly, the large valve V7 moves

to the left and the passage opens to release the brake. In this way, the braking state is maintained though the clutch pedal and

brake pedal are released after the brake pedal and the clutch pedal are

pressed simultaneously 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 SW15 and the clutch switch SW11 are turned

on so that the volage is supplied to the stop lamp L5 through the braking

pedal switch SW15 and the stop lamp L5 is lighted out. Furthermore, the

predetermined voltage is supplied to the base of transistor NT26 through the

braking pedal switch SW15 and the resistor R42 to trun on the transistor

NT26.

Meanwhile, when the automobile is stopped as above mentioned, 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 automatic

braking switch SW5, an emitter and a base of transistor PT3, resistor R33, diode D34 and clutch switch SW11 and transistor PT3 is turned on. As the

neutral switch SW13 is turned on, the current passed through transistor PT3, brake relay RL4, transistor NT26, transistor PT4 and diode, so the brake

relay is operated.

If the brake relay RL4 is operated as above mentioned, the contact c is

connected with the contact a of the brake relay RL4, the power voltage is

supplied to the brake solenoid SOI of the valve B through the contacts c and

b of the release relay RL3 and the contacts c and a of the brake relay RL4

to be accomplished the braking operation.

Furthermore, the voltage passed through the contacts c and a of the

brake relay RL4 makes to be turned on the SCR 13 through the diode D21 and - li ¬

the resistor R26 so that the stop lamp relay RL2 is operated with the current which passes through the transistor NT18. Accordingly, the contact

c of the stop lamp relay RL2 is connected with the contact a, the power

voltage is supplied to the condenser C15 through the contacts c and b of the

release relay RL3, the contacts c and a of the stop lamp relay RL2 and the diode 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

doesn't flow 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 position, the release relay RL3 does't operate. Furthermore, if the brake pedal is released, the current which flows to the brake relay

RL4 is cut off, but the braking force can be maintained as it was. That is, if the current once flows and is cut off to any one side of the brake

solenoid SOI and the release solenoid S02, the state as above mentioned can be maintained until the current flows to the other side of the solenoid.

As above mentioned, according to the system 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 automobile.

During the stop like the avove, if the driver draws the parking brake

for parking, the parking brake switch SW2 becomes on state and the signal which 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 switch SW2 so that the transistor NT28 is turned off and

the buzzer Buzz sounds. Accordingly, the driver doesn't have to draw the

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 driving up the automobile to the upward slope, will be descrived. In the Fig. 2 the inclination switch 17 is operated depending on the

inclination of the front and the rear of the automobile. At this time the

steelball 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 of the downward inclination. That is,

when the automobile is driven up the inclination, the steelball 15 is placed on the position shown with the dotted lines so that the light from 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 transmission in

driving up the inclination(the forward gear), the clutch pedal and brake

pedal are pressed si ultaneouly. At that time 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 from 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 relay RL4 of the brake circuit 22 is operated.

Therefore, as the power voltage is supplied to the brake solenoid SOI of

the valve B through 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 performed

and the SCR 13 is turned on at the same time then the stop lamp relay RL2 is operated. Thus, the stop lamp L5 is turned on the the condenser C15 of 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 SW11.

As above menioned, when the automobile is stopped by pressing the clutch

pedal and brake pedal in driving up the upward slop, the braking force is

maintained so far as the clutch pedal is not to be released though the brake pedal is released without placing the gear in the neutral position. In

this way, as the driver transmits the gear, releases the clutch pedal to

start and presses the acceleration pedal, the clutch switch SW11 is turned off, thereby the current doesn't flow through the diode D25 of abnormal release preventing circuit 21, while the voltage charged in the condenser

C15 is supplied to the base of the transistor NT19 through the resistor R30

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 S02 of the valve B through the contacts c and a of the release relay RL3 so that

the braked state is released and the automobiles con be started at once.

On the other hand, when the clutch pedal and the brake pedal are pressed

simultaneously on upward inclination like the above, the gear is placed in the backward and the brake pedal and clutch pedal are released, the automobile is moved to backward because the brake operation in not to be

performed. That is, if the gear is placed in the backward, the backward

switch SW14 is turned on and the predetermined voltage is supplied to the

base of the transistor NT24 through the switch SW14 and the resistor R39 to

be turned on the transistor NT24.

Accordingly, most of the currents which are supplied to the base of

transistor NT25 through the phototransistor 16 and resistor 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 formed

and the brake operation can't be performed.

Next, the operation of the system according to this invention, when the

automobile is drived on the downward slope, whill be described. In that case, as the steelball 15 of the inclination switch 17 is placed in the

position shown with the solid lines, the light from the LED 14 can't be received in the photodiode 16 so that this phtodiode 16 is turned off.

Under such a condition, if the clutch pedal and the brake pedal are

pressed simultaneously to stop the automobile for a while driving the

downward slope, the clutch switch SW11 and the brake pdeal switch SW15 are

turned on. At that time, if the gear is pleaced in the backward and the

brake pedal and the clutch pedal are released, the braked state can be

maintained. That is to say, if the gear is placed in the backward, the

backward switch SW14 is turned on and the backward lamp L4 is turned on and at the same time the power voltage is supplied to the base of transistor NT22 through the resistor R38 as a predetermined signal, 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 switch SW15 and the resistor R42 and the transistor NT26 is

turned on. Accordingly, the power voltage is supplied to the brake soleniod SOI 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 pedal and the brake pedal in downward inclination as above mentioned and if

the gear is placed in the forward, the brake operation can't be performed

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 lamp

L5 is turned on and the transistor NT26 is turned on. However, because all

of the transistors (NT25, NT24, NT22, PT4) are off, the brake relay RL4

can't be operated. Furthermore, because the clutch switch SW11 becomes "on" in the braked state like the above, the voltage charged in the condenser C15 is grounded through resistor R30, diode D25, resistor R34,

transistor NT20, diode 33 and clutch switch SW11 so that the release relay

RL3 don't be operated. Therefore, in this condition if the release pedal

and the clutch pedal are released, the automobile can be started at once.

In every condition as mentioned above, if the automobile is started and

is moved with the predetermined speed, the transistor NT2 of the running

speed detctor 7 is turned on and the transistor NT3 is turned off. In this way, if the transistor PT1 is turned on and the voltage charged in the

condenser C9 is supplied to the base of transistor NT4 through the resistor

R9 as a predetermined signal, then the transistor NT4 is turned on and the power voltage is supplied to the release relay RL3 so that this release

relay RL3 is operated. Therefore, the release operation is performed as

the pwer voltage is supplied to the release solenoid S02 of the valve B.

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 conforming the brake release

during the automobile's running.

Next, in Fig. 2, it will be described that the brake operation is

performed by pressing the one-toutch switch SW7 during runnig the automobile

in state "off" the automatic brake switch SW5. The one-toutch switch

SW7 is tc supply the signal to perfor e the brake operation when the speed

senser 5 or the running speed detector 7 is out of order and in an emergency.

The driver is try to stop the automobile by pressing the clutch pedal and

the brake pedal when the conditions like the above occur. At this time, if the one-toutch switch SW7 is pressed, when the transistors NT26 and, NT25

are state "on" in the way of driving up the upward slope like the above,

the voltage is supplied to the brake relay RL4 so that the brake relay RL4

is operated and the brake operation is performed.

And, if the brake relay RL4 is operated, a predeter ind signal is

supplied to the base of transistor NT29 through resistor R46 of the brake

indicating lamp circuit 9 to turn on the transistor NT29. Furthenore, the

stop lamp relay RL2 is operated when the brake relay RL4 is operated and the

predetermined signal is supplied to the base of the transistor NT5 through

the contacts c and a of the stop lamp relay RL2 and the transistor NT5 is

operated. Therefore, the transistor NT12 and the transistor NT13 are turned on and the brake indicating lamp L2 is lighted on. Because the transistor

NT14 is turned on and off with predetermined frequency according to the signal of the multivibrator 11, the signal supplied to the base of

transistor NT13 is grounded periodically through diode D4, transistor NT14

and transistor NT29 so that the brake indicating lamp L2 flickers with the predetermined period. Accordingly, the driver can notice that the current

flows in the brake solenoid SOI.

According to the system of this invention, if the headlight switch SW3

is turned on during running the automobile, the transistor NT6 is turned on,

the transistor NT2 of the running speed detector 7 is turned on and the transistor NT3 is turned off. Therefore, as the voltage don't be supplied

to the headlight relay RL1 through the transistor NT3 and the automatic

headlight switch SW4, the headlight relay RL1 can't be operated so that

headlight L3 is lighted on. Furthermore, in case of the automobile stops, the transistor NT2 of the running speed detector 7 is turned off and the

transistor NT3 is turned on. Accordingly, if the power voltage is supplied

to the headlight relay RL1 through the transistor NT3 and the automatic

headlight switch SW4, 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,

when the automatic headlight switch SW4 is turned on and the headlight

switch SW3 is turned on also, if the automobile is stopped the headlight L3

is light out, and if the automobile is runed the headlingh L3 is lighted on.

In addition, according to the system of this invention, if the key is

removed when the side light switch SW1 becomes on(the state of the side

light is lighted), the warning sound is generated. That is, because the predetermined voltage is supplied to the base of the transistor NT10 in the abormal key off preventing circuit 8 through the resistor R13 when the key

switch SW9 is turned on and the transistor NT10 is turned on, the signal

which is supplied to the base of the transistor NT9 is grounded through

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 transistor NT10 is turned off so that the transistor NT9 is turned

on, with result that the transistor NTH is turned on. In this way, a

samll currents from the emitter of said transistor NTH makes the transistor

turned on through the resistor R15, most of the currents flows the diode D13

and the transistor NTH and the buzzer Buzz generates the sound.

According to the system of this invention, if the parking brake switch

SW2 is turned on, after making the key switch SW9 be turned on or off, the current flows through the release solenoid S02 and the brake operation is

released. That is, if the key switch SW9 is turned off while th parking

brake switch SW2 is turned on, the transistor NT7 of the brake release circuit 10 for releasing the braked state is turned off and the transistor

NT3 turned on. Thus, the voltage charged in condenser C15 is supplied to

the base of the transistor NT19 through the resistor R30 as a predetermined

signal. Accordingly, as the release solenoid S02 of the valve B is operated

when the current flows through it, the current which passed through the

release soleniod S02 is cut off if the condenser C15 becomes below

predetermined voltage.

Furthermore, in the system according to this invention has the stolen

preventing switches SW6 and SW12. If the switches Sw6 and SW12 are turned on in the parking state, the current flows through the brake solenoid SOI

for the predetermined time so that the brake operation is performed and the release operation is cut off.

Referring to Fig. 4 to Fig. 6, now, the control system according to an another embodiment for this invention will be described. The difference of an embodiment shown in Fig. 4 to Fig. 6 comparing with the aforementioned embodiment are that the inclination switch 17 shown in Fig. 2 is divided into the first inclination switch 17' and the second inclination switch

17(see to Fig. 5), and that a cut off circuit 51 is coaresed additionally. That is, in Fig 5, the inclination switch 17 and 17' operate according to the foreward and backward inclination degree of the automobile and a steel balls 15 and 15 move to transfer or cut off the light as the automobile is running on the ground, upward slop or downward slop and the circuit performs a given function. Herein, the inclination switch 17 uses to operate the circuits in running the auto bile backwardly and upwardly, while inclination swtch 17' uses to operate the circuits in running the autombile forewardly and upwardly. The description in detail of present embodiment based on this operation is omitted because it is similar to that of said embodiment. Also, this invention can be modified varously not defined to aforementioned embodiments if it isn't derive from the conception of the invention. For example, although the circuit of this invenion is composed of the elements such as transistor, resistor and condenser, it may composed with using the logic circuit of the low consumption power or the custom IC.

According to the invention as above mentioned, the braking state, firstly, is maintained though the gear is placed in the neutral and the clutch pedal and brake pedal are released when the automobile is stopped by

pressing the clutch pedal and brake pedal. Secondly, the braking state is maintained though the brake pedal is released in the state of a foward gear

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 is

maintained though the brake pedal is released in the state of a backward

gear when the automobile is stopped by pressing 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 the headlight is

lighted off in stopping. Fifthly, the alarm is generated for warming to

be release parking brake when a driver tends to start the automobile while

the parking brake is operated. Sixthly, the alarm is generated to turn off

the headlight a side light if the key switch is turned off while the headlight a side light are turned on, and if a driver operates the stolen preventing switches the robbery of the automobile can be prevented because

the brake release operation will not be performed. Also if a driver

operates the stolen preventing switch the robbery of the automobile can be

prevented because the brake release operation will not be performed, and if

the stolen preventing circuit is operated, the brake release operation can't

be performed after the brake operation was performed thereby resulting the

advantages that the automobile can be prevented from being stolen and

convenient driving can be possible are acquired.

Claims

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 SQ1 and release solenoid S02; a brake circuit 22 for operating the brake solenoid SOI of said electronic valve B; a release circuit 20 for operating the release solenoid S02 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

automatically 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 16.

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 autoβobile.

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 SOI and release solenoid S02;

a brake circuit 22 for operating the brake solenoid SOI of said

electronic valve B; a release circuit 20 for operating the release solenoid S02 of said electronic valve B;

a stop lamp circuit 23 for turning on a stop lamp L5 when the autoβobile

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 froa 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 froa 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 of 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 froβ

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 8 for generating the alarm in the

case of the abnormal key off.

5. A control system for automobile according to chaiβ 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 autombile is

running downwardly and unwardly a steel ball 15 moves according to the inclination degree so that a phototransistor 16 can receive the light from a

LED 14 and the phototransistor 16 is turned on.