FI75767B - AUTOMATISKT BROMSKONTROLLSYSTEM. - Google Patents

Description

The present invention relates to an automatic accessory for a vehicle braking system for facilitating the stopping of a vehicle, which is practical when restarting after stopping. The system is specially adapted to avoid damage during hill starts. The system utilizes a hydraulic shut-off valve and an electronic circuit to control the fluid flow in the brake system.

When driving in the normal way, the brake pedal and clutch pedal must be depressed when stopping the car. When starting again after stopping, the brake pedal Jin must be released, depressing the accelerator pedal and at the same time slowly raising the clutch.

After parking the car, release the parking brake, then the brake pedal and at the same time depress the accelerator pedal and slowly raise the clutch.

When driving uphill after parking, select a low gear before releasing the parking brake, accelerate and raise the clutch. If the clutch pedal is raised too fast at this point, the car's engine will shut off. If the clutch is raised too slowly, the car will slide backwards, which could cause a collision with the car behind. Mastering this driving technique therefore requires a great deal of skill.

It should also be mentioned that the lights do not always have to be on when the car is stopped. However, the lights are usually constantly on, consuming the battery once they are turned on.

The object of the invention is to provide an automatic brake control system which opens and closes the flow of brake oil between the main brake cylinder and the brake drum. Such a system may include a shut-off valve that turns the solenoid coil on and off. The system controls the car properly in all conditions.

Another object of the invention is to provide an automatic brake control system which prevents the car from moving on hills after stopping when the brake and clutch pedal is depressed and then the brake is released. In this way, the car stopped is started again by depressing the accelerator pedal and at the same time slowly raising the clutch, which starts the car.

Yet another object of the invention is to provide an automatic brake control system that turns on the headlights when the car is moving at night and automatically turns off the lights when the car is stopped.

In view of the above objects, there is provided an accessory according to the invention comprising a jacket forming a brake oil passage; a valve device within said jacket for controlling the flow of brake oil, the valve device comprising a main shut-off valve and a backup shut-off valve for sealing said oil passage; first and second solenoid windings mounted at opposite ends of said jacket for selective use of said valve device; an electrical circuit for selectively activating said windings; a master brake cylinder in fluid communication with one end of said channel; and a braking device in fluid communication with the other end of said channel, characterized in that the first solenoid coil can be activated by successively depressing the vehicle clutch pedal and brake pedal and then releasing the brake pedal, the activated solenoid 3 75767 by releasing the clutch pedal and depressing the accelerator pedal, the second solenoid coil being activated and pulling the piston connected to the main shut-off valve towards the the braking force.

The main shut-off valve controlling the brake oil is connected to the main brake cylinder and the brake drum via plugs inserted at each end of the cylindrical shell. The main shut-off valve, the emergency shut-off valve and the piston are located inside the cylindrical shell. The backup shut-off valve and the piston are connected to each other by a threaded rod, the main shut-off valve being separated from them in a cylindrical shell. The main shut-off valve has an opening through which the oil in the cylindrical casing and brake drum can return to the master cylinder due to the magnetic properties of the solenoid windings. The plugs arranged at the ends of the cylindrical casing each have a brake oil channel, a connection for the master cylinder or brake caliper and a connection for a contact switch which operates under hydraulic pressure.

The electrical circuit connects the plug contact switches and the solenoid winding t to the battery via a relay and a microswitch connected to the switch pedal so that the microswitch directs the electrical current supplied from the battery to the input side or output side solenoid winding.

In addition, the electrical circuit is connected to a headlight line having a relay, a brake switch, a wheel speed sensor, and a second relay, and which headlight line is connected to a parking brake line including a parking brake switch and a relay.

In this case, by depressing the brake pedal connected to the master cylinder, the brake oil in the master cylinder flows through the oil passage of the brake plug inlet, the interior of the cylindrical casing and the oil passage of the exit plug. When the clutch pedal is depressed, which activates the microswitch connected to it, the solenoid coil at the inlet end of the cylindrical shell is switched on by the current supplied from the battery. The switched-on solenoid coil pulls the shut-off valve onto the support in the inlet plug, thus preventing the flow of oil and maintaining the pressure in the brake drum as long as the clutch pedal remains depressed.

When the car is parked in the press brake * · and clutch pedal in a certain order and connected to the parking brake, engages the parking brake pipe relay on and opens the electrical circuit connecting the battery input side of the solenoid coil via a con-taktikytkimen and clutch micro switch so that the input side of the solenoid coil is switched off a check valve closes the oil passage. When the clutch pedal is released, the braking force is maintained because the hydraulic pressure on the master cylinder side is lower than on the brake drum. Thus, the shut-off valve is pushed toward the entrance side of the plug support, so that the oil passage is closed tightly.

Then, when the clutch pedal is released, the controls also mikrokyt-current output side of the solenoid coil, which is switched on. This attracts the piston and the spare shut-off valve, but not the main shut-off valve. The oil inside the cylindrical casing and in the brake drum returns to the master cylinder through the opening of the main shut-off valve.

When the car's headlights are switched on, the revolution sensor detects the car's movement. When the car is moving, the revolution sensor connects the headlight wire. With the car stationary, open the RPM circuit.

Finally, if the braking power of the automatic brake control system is insufficient, the braking power can be increased by manually depressing the brake pedal, whereby the oil is fed to the brake drum under higher pressure.

Other preferred embodiments of the invention are characterized by what is set out in the claims below.

5,75767

In the following, the invention will be explained with reference to the accompanying drawings, in which

Fig. 1 shows a cross-section of an automatic brake control system according to the invention in the normal state, in which both the clutch and the brake pedal are active and when the headlamps are on.

Fig. 2 shows a cross-section of a brake control system according to the invention in a situation where only the brake pedal is released after both the clutch and brake pedals have been depressed and when the headlights are on.

Fig. 3 shows a cross-section of the system according to the invention when the clutch pedal is released, whereby the oil channel opens to release the brake drum.

Figure 1-3 shows an automatic brake control system generally comprising a control valve 1 and an electrical circuit.

The valve 1 comprises two solenoid coils 3,4 located at each end of the cylindrical jacket 5 outside it, two plugs 6,7 partially inserted at each end of the cylindrical jacket 5 and a sealing rod 8 placed inside the cylindrical jacket 5 by the plugs 6,7 between.

The inlet plug has a longitudinal oil passage 10, a connection opening 11 for the main brake cylinder 12 and a clutch opening 13 for the inlet connection 14. The outlet plug 7 has a longitudinal oil channel 10 ', a connection opening 15 of the brake drum 16 and a clutch opening 17 for the outlet connection 18.

The connecting opening 11 of the plug 6 for the cylinder is connected to the main brake cylinder 12 via a pipe 19. The inlet connection port 13 supports a connector 14 which operates at the hydraulic pressure of the oil passage 10. The master cylinder 12 stores the oil and is actuated by the brake pedal 20. The connection opening 15 for the drum of the plug 7 is connected to the brake drum 16 and 6 75767 The output connection opening 17 supports the brake connector 18, which also operates under the hydraulic pressure of the oil channel 10 '.

Inside the valve body there is a sealing element 8, which includes a main shut-off valve 21 and a spare shut-off valve 22, which is connected to the piston 23 by means of a threaded connecting rod 24. At the other end of the main shut-off valve 21 a sealing part 25 is arranged. A sealing part 26 is also arranged in the central part of the backup shut-off valve 22. The main shut-off valve 21 has an opening 27 extending axially from one end of said valve 21. At the inner end of the plug 6 there is a seat 28 suitable for tightly connecting the end of the main shut-off valve 21 to the oil passage by a sealing part 25.

A spring 29 is arranged between the outlet plug 7 and the piston 23. Openings 30 for springs 29 are formed in the inner end of the plug 7 and in the outer end of the piston. The length of the sealing rod 8 can be adjusted by means of nuts 31 located in the threaded connecting rod 24.

The electrical circuit 2 comprises several electric power lines. The common line "A" includes a battery 40, a connector 18 and a limit switch 41 which operates by a switch pedal 42. The first line "B" is for switching on the input solenoid coil 3 and includes a terminal switch 41, a switch 43, an input terminal 14, a first relay 44 and a lamp 45, forming a series circuit from the battery 40 to the input winding 3. The second line "C" is for switching on the output winding 4 and includes a second relay 46 forming a series circuit from the battery 40 to the output solenoid winding 4. The third line "D" is for conducting current to the lantern 47 and includes switch 39, a third relay 49 which can be operated manually, a fourth relay 50 connected to line "B" and a revolution sensor 51 for detecting the movement of the car 7 75767. The third line "D" forms a series circuit from the battery 40 to the front lamp 47 and is connected to the line "A" by means of the third and fourth relays 49,50 and the speed sensor 51. Finally, the fourth line "E" consists of a parking brake switch 52 operated by the parking brake and a fifth relay 53 connected to the line "A". Line "E" operates on the current supplied by line "A".

The input solenoid coil 3 and the output solenoid coil 4 are connected directly to the battery via relays 44 and 46. The relays are turned on to close a circuit to connect one solenoid coil to the battery with an electrical signal supplied from the battery via line "B" or "C".

The operation of the preferred embodiment of the invention will be explained below. Assume that the sealing rod 8 is initially detached from the inlet plug seat 28, separate from the inlet plug 6 and the outlet plug 7, as in Figure 1. With the sealing rod in this position, oil flows freely from the master cylinder 12 to the brake drum 16 because the oil duct is open. Solenoid windings 3 and 4 are not switched on. This sealing rod position is normal. If the brake pedal 20 is depressed, the oil in the master cylinder 12 flows into the brake drum 16 through the interior 9 of the cylindrical shell 5. the oil fills the hydraulic cylinder 32 of the brake drum 16, which causes the shoe 33 to be pressed against the inner wall of the brake drum 16 so that the wheel can stop in a known manner. As a result of depressing the brake pedal 20, the pressurized oil in the channels 10 and 10 'pushes the plates 34 to the contact points of the terminals 14 and 18, whereby the electrical circuit closes. The brake oil in the master cylinder 12 flows into the brake drum 16 through the oil passage 10 of the inlet plug 6, the interior of the cylindrical shell 5 and the oil passage 10 'of the outlet plug 7.

When the clutch pedal 42 is depressed, thus activating the microswitch 75767 8 kin 41 / connects the microswitch 41 to the line "A" to the line "B". Electric current can be supplied from the battery 40 to the input solenoid winding 3 / when electricity through the output terminal 18, microswitch 41, fourth relay 50 or switch 43, input terminal 14 and first relay 44 closes the relay 44. The solenoid winding 3 at the input end of the cylindrical housing 5 on with an electric current supplied directly from the battery 40 via the first relay 44. A working solenoid coil 3 pulls the inlet plug 6 of the sealing rod 8 into the seat 28 to stop the flow of oil, as in Fig. 2, so that the braking force is maintained in the brake drum 16 as long as the clutch pedal 42 is depressed.

For example, if the car is on a hill and the automatic braking power is insufficient, the braking power can be improved by additionally depressing the brake pedal 20 manually.

When the car is parked, first depressing the brake pedal 20 and the clutch pedal 42 in a certain order, the parking brake is then engaged, which engages the clutch 52 on line "E". The fifth relay 53 of the parking brake line "E" is switched on, opening the line "A". the seat of the push-in inlet plug 6 due to the high hydraulic pressure of the naked brake drum and the spring 29. The flow of oil thus remains tightly closed.

On the other hand, if starting again after a short stop by lifting the switch, the microswitch 41 opens the line "B" and closes the line "C". The electric current coming from the battery 40 via line "C" connects the second relay 46 and closes the circuit through the solenoid coil 4. The solenoid coil 4 is thus switched on by means of an electric current supplied directly from the battery.

The switched-on solenoid coil 4 attracts a piston 23 which is connected to the emergency shut-off valve 22 via a threaded rod 24, but not to the main shut-off valve 21. Since the hydraulic pressure acting on the plug 6, i. the seat of the plug 6 between the sealing part 25 mounted on the main shut-off valve 21 is relatively large, the relatively small electromagnetic force of the solenoid coil 4 cannot attract the entire sealing rod 8. But since the diameter of the opening and the force acting between the sealing part 26 mounted on the emergency shut-off valve 22 is very small. The operating solenoid coil 4 can thus pull the piston 23 and separate the backup shut-off valve 22 from the main shut-off valve 21, allowing the oil inside the cylindrical shell 5 and the oil in the brake drum 16 to return to the master cylinder 12 through the opening 27 and oil passage 10.

When the brake pedal 20 is depressed again, the main shut-off valve 21 separates from the support 28 by the oil supplied from the master cylinder 12.

The speed sensor 51 detects the rotational movement of the car wheel. When the car wheel stops, open the sensor switch wire "F", and when the car is moving, close the sensor switch wire "F". Thus, when the car is moving, the line "F" connects to the fourth relay 50 connected to the line "B" and opens said line. Thus, if the brake pedal 20 and the clutch pedal 42 are depressed while the car is moving, the solenoid coil 3 is not engaged and no automatic braking effect is applied to the brake drum 16. To selectively activate automatic braking while the car is moving, the "B" switch 75767 10 can be operated manually.

Also when the car is moving and the sensor switch closes the wire "F", relay 50 is switched on and relay 49 is thus switched off. Thus, line "D" remains closed using the headlamps 47. But when the car is stopped, the sensor switch opens line "F", the fourth relay 50 turns off and the third relay 49 turns on and the headlamp line "D" opens, switching off the lights. Alternatively, the third relay 49 may be operated manually to avoid automatic switching off of the lights, if necessary.

As described above, the system according to the invention can brake the car effectively in all conditions and is specially adapted to facilitate the movement of a stopped car, especially when it is stopped or parked on a hill. All you have to do is depress the brake pedal and the clutch pedal as usual when stopping the car to make the system work. When the brake pedal and clutch pedal are depressed, then the released brake pedal by depressing only the clutch pedal, the braking effect is maintained thanks to the system. The braking system according to the invention is easy to use and enables even a beginner to stop the car and start again, even on a steep hill.

When the headlights are on and the car is moving, the lights automatically stay on. When the car is stopped, the headlights are automatically switched off. However, manual operation allows the lights to be kept on even when stopped, if desired.

It will be clear to a person skilled in the art that the invention is not limited to the above-mentioned exemplary embodiment, but can be modified within the scope of the appended claims.

Claims (6)

75767 An automatic vehicle braking system accessory for facilitating vehicle stopping, the accessory comprising a sheath (5) forming a brake oil passage (10); a valve device within said jacket (5) for controlling the flow of brake oil, the valve device comprising a main shut-off valve (21) and a backup shut-off valve (22) for sealing said oil passage; first and second solenoid windings (3,4) mounted at opposite ends of said jacket (5) for selective use of said valve device; an electrical circuit for selectively activating said windings; a master brake cylinder (12) in fluid communication with one end of said channel (10); and a braking device in fluid communication with one end of said channel (10), characterized in that the first solenoid coil (3) can be activated by successively depressing the vehicle clutch pedal (42) and the brake pedal (20) and then releasing the brake pedal, the activated solenoid coil (3) pulls the main shut-off valve (21,22) towards itself along the jacket (5), whereby this. : closes the oil channel (10) for maintaining the braking force in the brake drum (16) known per se, so that e.g. a vehicle on a hill or similarly inclined plane can be moved upwards without slipping back by releasing the clutch pedal; and depressing the accelerator pedal, whereby the second solenoid coil (4) is activated and pulls the piston (23) connected to the main shut-off valve (21, 22) with the rod (24) towards itself along the casing (5), opening and releasing the oil channel (10) in the brake cylinder (16). ). Auxiliary device according to claim 1, characterized in that the main shut-off valve (21) and the backup shut-off valve (22) are freely movable relative to each other, said main shut-off valve being located generally adjacent to the first: said coils (3) subjected to valve traction when the first coil (3) is turned on and 75767 that the piston (23) connected to the backup shut-off valve (22) is generally arranged adjacent to one of said coils (4) which is subjected to traction when the second coil (4) is turned on . Auxiliary device according to claim 2, characterized in that said main shut-off valve (21) has an opening (27) extending therethrough for the flow of liquid through said valve. Auxiliary device according to claim 2, characterized in that said piston (23) is connected to said adjustable emergency shut-off valve (22). Auxiliary device according to claim 1, characterized in that the electrical circuit comprises a common power supply line (A) to which the first and second solenoid windings (3,4) are connected, a first and a second solenoid winding (3,4). a switch (41) common to the wires (B, C), a headlight wire (D), a motion detector connected to the headlight wire (D) to turn off the headlights when the car is stopped, which wire (D) is also connected to the first solenoid wire (B) to remove the automatic brake system accessory and a parking brake line (E) comprising a parking brake switch (52) that controls a relay (53) to maintain an automatic braking system in the operating state when the vehicle is parked. Auxiliary device according to claim 5, characterized in that said switch (41) is connected to a vehicle switch device (42) and is activated to selectively produce energy in said - first or second solenoid line (B, C) depending on the operation of the switch (42). 75767