JPS6092151A - Electromagnetic servo brake device for automobile - Google Patents

Abstract

PURPOSE:To reduce the cost of a servo brake device and as well to miniaturize thereof, by providing a reaction disc of a vacuum booster in a reaction force device disposed between a plunger driven by an electromagnet and an input control rod, and the piston rod of a master cylinder. CONSTITUTION:A reaction disc 5 is disposed between a plunger 8 of an electromagnetic means 6 and an operating rod 3, and the piston rod 4 of a master cylinder 2. Further, a position sensor 9 is secured to the rear end part 6b of the above-mentioned plunger 8. When the rod 3 is operated, the disc 5 is contracted and the master cylinder 2 is operated. The plunger 8 and the rod 3 are relatively displaced, which is detected by the sensor 9 that delivers a signal to a controller 10. The controller 10 energizes a magnet 7 in accordance with this signal, and therefore, the plunger 8 is actuated. With this arrangement the peripheral section of the disc 5 is contracted and as well electromagnetic assist force acts upon the master cylinder 2. The energization of the electromagnet 7 is continued until the above-mentioned relative displacement becomes zero.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an electromagnetic servo brake system for automobiles, that is, a V-horn control system that adds assist force by electromagnetic means to the pedal force applied to the brake pedal. This article concerns a servo brake device designed to increase power.

(Prior art) As a 1-nervo brake system for automobiles, one that utilizes the engine's intake negative pressure is generally used (A).
, it is possible to obtain a large braking force by generating an assist force based on the intake negative pressure and applying it to the brake mask cylinder.However, this brake system has a Since it is difficult to adjust the intake negative pressure, for example, the boosting ratio of the braking force to the pedal force cannot be set arbitrarily and accurately to 1", and the optimum boosting characteristics cannot be obtained. In addition, if the engine stops while driving, the f8 force effect of braking force cannot be obtained, and it cannot be applied to cars equipped with supercharged engines or electric cars where there is no intake negative pressure. There are drawbacks.

Therefore, an electromagnetic servo brake device that uses an electromagnetic saw instead of the intake negative pressure to boost the force of the braking horn has been considered.

This energizes the electromagnet when the Play 4 pedal is pressed,
The assist force generated by the electromagnet is added to the pedal force and is applied to the mask cylinder. According to this, for example, by detecting the pedal force and the assist force or the pedal force and the braking force, and controlling the energization of the electromagnet so that the ratio of the two is set (il), the braking force with respect to the pedal force can be adjusted. It becomes possible to set the boost ratio arbitrarily and with high precision.

Furthermore, since the intake negative pressure of the engine is not used, a boosting effect can be obtained even when the engine is stopped, and it can also be applied to automobiles equipped with supercharged engines and electric automobiles. However, in this electromagnetic servo brake, at least two hinges are required to detect the pedal force and the braking force, or the pedal force and the assist force, respectively, and the energization of the electromagnet must be controlled while comparing the two. The problem is that the control system becomes complicated.

By the way, according to Japanese Unexamined Patent Publication No. 49-16128@, a brake device using an electromagnet has been proposed, but this is a brake system that avoids activation of the electromagnet in the event of a car collision. Since it is designed to avoid generating power, the purpose is different from the servo braking system, which doubles the braking horn during normal brake operation.

(Object of the Invention) The present invention is directed to controlling the energization of the electromagnet in order to increase the predetermined boost ratio by 1 in the electromagnetic 1-nervo brake equipment as described in Section I.
By using only one can, and by reusing the reactor disc used in conventional negative pressure servo brakes, the energization control system for the electromagnetic device can be simply configured, and this The purpose is to reduce the cost and size of various types of brake devices.

(Structure of the Invention) The electromagnetic servo brake device according to the present invention is structured as follows in order to achieve two objectives.

That is, a brake starter cylinder i equipped with a brake oil chamber,
an operating rod that is connected to the brake pedal and generates braking pressure in the brake oil chamber of the mask cylinder when the pedal is depressed; and an electromagnetic rod that applies an assist force to the mask cylinder to couple the braking pressure when energized. means, which is interposed between the master cylinder and the pelleting rod A, and is compressed in response to the pedaling force from the rod and the assist force from the plunger through the action of the electromagnetic means. The operating rod is connected to a binder that detects the relative displacement between the operating rod and the plunger caused by the difference in the compression amount of the disk, and the operating rod When a relative displacement occurs between the
The controller is provided with a controller that stops energizing the electromagnetic means at 114 when the ratio of the pedal force and the thrust force acting on the rear axicon disc becomes 1/J<setting 1 and the relative displacement amount becomes zero.

Note 1. [-Instead of applying an unstretching force to the action disc from the electromagnetic means, it is also possible to apply a pressing force based on the braking pressure generated by the mask cylinder. (1°) In that case, the pressing of the piston casing which receives the braking low and pushes the reactor disc will detect the amount of relative displacement between the member and the A verating rod.

According to such a configuration, the energization control for the electromagnetic means to obtain a predetermined boost ratio is performed in accordance with the operating rod and the plunger or braking pressure that causes the assist force of the electromagnetic means to act on the reactor disc. The amount of relative displacement between the disk and a pressing part such as a piston that presses the disk is detected by one sensor. The configuration of the -C control system is greatly simplified compared to the case where the two are detected, amplified and compared, and the energization of the electromagnetic means is controlled according to the results.

(Example) Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG.
Between the brake mask cylinder 2 that generates dynamic pressure, there are an IC operator rod 3 connected to the brake pedal 1, and a screw 4 that presses a piston (not shown) in the mask cylinder 2. , these both rods 3
. here,
At the end of the piston rod 4, there is a disk holder 4.
ah<nQL, the above-mentioned reactor disc 5 is housed in the receiving part 4a, and when the operating rod 3 moves in the direction a by depressing the brake pedal 1, the end surface of the rod 3 3a presses the center portion 5a of the rear axicon disc 5, and the pedal force applied to the pedal 1 causes the piston rod 4 to generate braking pressure in the direction a, that is, against the mask cylinder 2 via the disc 5. At this time, the central portion 5a of the rear axicon disc 5 is compressed by H1 in response to the above-mentioned pedaling force.

On the other hand, an electromagnetic device 6 is provided around the operating rod 3.
is provided. This N magnetic device 6 is composed of an electromagnet 7 and a plunger 178 fitted to the operating rod 3. The front end of the plunger 8 has a peripheral portion of the reactor disk 5. -1bf: The disk portions 8a are formed so as to face each other, and when an electromagnetic force in the a direction acts on the blank 8 when the electromagnet 7 is energized,
The disk 61S 8a is the rear axicon disk)
The peripheral portion 51) of the mask cylinder 2 is pressed, and in conjunction with this, the piston rod 4 is also pushed in the direction a, that is, in the direction that generates braking pressure against the mask cylinder 2. In this case as well,
The peripheral portion 5b of the cushion disk 5 is compressed in response to the electromagnetic force.

Further, a position sensor 9 is provided at the rear end portion 8b of the plunger Y8.
is permanently installed. This position sensor 9 is
The position of the operating rod 3 with respect to As shown in the figure, a signal A having a voltage level corresponding to the amount of displacement is output. This signal Δ is input to a controller 10, and the controller 10 controls the current flowing through the electromagnet 7 based on this signal Δ.

Next, the configuration of the controller 10 will be explained as shown in FIG. DC voltage V1 output from .12
and a comparison circuit 13 to which the triangular wave voltage v2 is inputted to the + side and - side terminals, respectively. As shown in FIG. 4, this comparison circuit 13 compares the DC voltage v1 and the triangular wave voltage V2, and outputs a pulse signal B that periodically becomes high level when the DC voltage V1 is greater than the triangular wave voltage v2.

When the pulse signal 13 is at a high level, the power transistor 14 is turned on, so that the electromagnet 7
is set to be energized. In that case, the pulse width or conduction rate of the pulse signal B is DC Ti Ik V
1 level, that is, corresponds to the output 11i of the position sensor 9 J
Therefore, the average current value applied to the electromagnet 7 corresponds to the relative displacement between the operating rod 3 and the plunger t-8 in the direction of the axis 1.

Next, the operation of this embodiment will be explained.

Now, when a person depresses the brake pedal 1 to brake during automatic operation, the depressing force is input to the mask cylinder 2 via the operating rod 3, the rear axicon disc 5, and the piston rod 4. At this time, as shown in an enlarged view in FIG. 5, the center portion 5a of the rear axicon disc 5 is pressed against the end surface 3a of the operating rod 3, and only the center portion 5a responds to the pedal force. compressed by the amount. Therefore, a relative displacement ff1X in the axial direction occurs between the operating rod 3 and the plunger 8, which corresponds to the pedaling force. This is detected by the position sensor 9 and sent as a signal A to the controller 10.

On the other hand, in the controller 10, based on the signal Δ, the DC voltage v1 corresponding to the relative displacement amount
As a result, the comparator circuit 13 outputs a pulse signal B (when the level of the DC voltage V1 is greater than the peak value of the triangular wave voltage V2, a DC signal with a conduction rate of 100%). Therefore, the power transistor 14 is ignited and the electromagnet 7 is energized. In that case, the magnitude of the applied current corresponds to the above-mentioned relative displacement amount X or pedal force.

When the electromagnet 7 is energized in this way, an N magnetic force corresponding to the current value acts on the plunger 8 in the electromagnet @6, and this force is applied to the master cylinder via the reactor disc 5 and the piston rod 4. 2 will be input. Therefore, in the mask cylinder 2, a braking pressure corresponding to the sum of the two blades is generated by inputting the above-mentioned road and the electromagnetic assist force I~ caused by the energization of the N magnet 7.

At this time, in the reactor disk 5, the fifth
As shown by the chain line in the figure, the peripheral portion 5b of the disk 5 is pressed and compressed by the disk portion 8a of the plunger 8, and as a result, the amount of relative displacement in the axial direction between the operating rod 3 and the plunger 8. X decreases. Then, when the amount of compression m of the reactor disk 5 by the operating rod 3 and the amount of compression of the disk 5 by the plunger 8 become equal, the relative displacement fiX becomes zero. As a result, the sending of signals from the controller 19 to the controller 10 is stopped, and as a result, the controller 10 stops sending signals to the controller 10. - In the roller 10, the output of the signal B from the comparator circuit 13 is stopped and the power transistor 14 is turned off, and as a result, ? The power supply to the Iim stone 7 is stopped. Here, since the amount of compression of the reactor disk 5 is proportional to J1 acting on it, the area of the end surface 3a of the operating rod 3 is 81, and the area of the disk portion 8 at the tip of the plunger is 81.
If the area of a is multiplied by S2, the amount of compression in the central part 5a and the peripheral part 5b of the rear axicon disc will be equal when the ratio of the pedal force to the electromagnetic assist force becomes Sr:82, and at this point the amount of compression to the electromagnet 7 will be equal. Power is cut off.

In this way, when the electromagnet 7 is de-energized, the electromagnetic assist force disappears and the braking force decreases, but at the same time, the axicon disc 1,1-
Since only the plunger ν8 is moved to the right in the drawing, that is, in the direction opposite to a, due to the zero elastic restoring force, a relative displacement amount in the axial direction occurs again between the plunger 8 and the operating rod 3. Therefore, the position sensor 9 outputs a signal corresponding to this amount of displacement to the controller 10, and accordingly, the controller 10 energizes the electromagnet 7 again.
Generates electromagnetic assist force.

As a result of repeating the above operation in an extremely short period, the central part 5a and the peripheral part 5 of the reactor disk 5 are
1) The relationship between the amount of compression, in other words, the end surface 3a of the operating rod 3 and the disk portion 8a at the tip of the plunger 8.
An assist force corresponding to the area ratio is obtained, and this assist force increases the braking force by a predetermined ratio.

In this embodiment, the step saw from the operating rod 3 and the electromagnetic assist force from the electric insulator H6 are applied to the reaction disc 5. A force based on the applied braking pressure may be applied to the rear axicon disc 5. In that case, the magnetic force is applied directly to the piston rod 4 of the mask cylinder 2, and the pressure of a piston or the like that presses the reactor disk 5 with the operating rod 3 and the braking arm is determined by the amount of relative displacement with the member. will be detected.

(Effects of the Invention) As described above, according to the present invention, in an electromagnetic servo brake device for an automobile that doubles the braking force by the assist force of the iK magnetic flat means, the predetermined boosting ratio is increased. an A-verating rod that presses a reactor disc in response to pedal force;
Plunge jt that presses the disk according to the assist force
Alternatively, the pressing of the piston plate that presses the disk in accordance with the braking pressure is performed simply by detecting the relative positional relationship of the members. Therefore, when controlling the energization of the electromagnetic means by detecting the pedal force and the assist horn or the pedal force and the braking force, amplifying both, and comparing them, only one sensor is required. etc., the configuration of the control system is simplified, thereby realizing miniaturization and cost reduction of this type of brake device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a schematic sectional view, FIG. 2 is an output signal level-displacement characteristic diagram of the position sensor used in this embodiment, and FIG. 3 is an electric circuit of the controller. 4 is a waveform diagram of an input/output signal showing the operation of the comparator circuit in the controller, and FIG. 5 is an enlarged sectional view of a main part showing the operation of this embodiment. 1... Brake pedal, 2... Mask cylinder, 3
... A plying [1, 5... Reactor disc, 6... Electromagnetic means (electromagnetic device), 9...
Rensa (ffff't?n→)), 10... Control applicant Toyo Kogyo Co., Ltd. Figure 2 Rod and Aimura's strength Figure 4

Claims (1)

[Claims] (1) Brake mask cylinder with boiled brake oil chamber,
An operating rod that is connected to the brake pedal and generates braking pressure in the brake oil chamber of the master cylinder when the pedal is depressed, and an assist force that acts on the mask cylinder to double the braking pressure when energized. an electromagnetic means that is interposed between the mask cylinder and the operating rod, and that is configured to press the pedal with the force of the rod (=
The pressing force based on the above-mentioned azimuth stalk or braking pressure is received through the J-shaped member, and the operating rod and the pressing force caused by the difference in the amount of compression of the reactor disc, which is compressed according to these forces, are is a sensor that detects the amount of relative displacement with the member, and in response to a signal from the sensor, the operator ``When a relative displacement occurs between the jig rod and the member, the pressure is passed through the electromagnetic means''. The power supply to the electromagnetic means is stopped when the ratio between the pedal force and unstruck force acting on the rear axicon disc and the push-in distance (l horn) reaches the set value and the relative displacement amount becomes zero. An electromagnetic brake system for an automobile, comprising a controller 1 and a roller.