JP2523941Y2 - Brake switch circuit for motorcycle anti-lock brake control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a brake switch circuit which can independently take brake switch signals of front and rear wheels and a joint portion into a control circuit of a motorcycle anti-lock control device.

[Conventional technology]

As shown in FIG. 3 (a), a conventional brake switch circuit for sending brake signals of the front and rear wheels to the motorcycle anti-lock control circuit 1 includes two brake switches 11, 11 'provided in parallel for the front and rear wheels. One of the signals is sent from the joint section 12 to the antilock control circuit 1, and the parallel brake lamps 13, 13 'connected to the joint section 12 are provided.
Is turned on.

[Problems to be solved by the invention]

However, in the above-described conventional brake switch circuit, the brake switch signals of both the front and rear wheels are sent to the anti-lock brake control circuit via the joint 12. For this reason, it is not possible to distinguish whether the brake signal is for the front wheel brake or for the rear wheel brake.

When calculating a reference wheel speed (estimated vehicle speed) or the like in the antilock control circuit, the antilock brake control device of the motorcycle inputs a brake switch signal of the front wheel in order to use the wheel speed signal of the front wheel as a reference. Is important.

Therefore, in order to distinguish the brake switch signals of the front and rear wheels, a method shown in FIG.

In this brake switch circuit, the common terminal of the switch is connected to the power supply B, and the normally open terminal is connected to the brake lamps 13 and 1.
3 ', two three-contact brake switches 21 and 21' for the front and rear wheels, which are connected in parallel to each other and connect the normally closed terminal to the antilock control circuit 1, and the normally open terminals of the two brake switches. The brake switch signals are connected to one anti-lock control circuit 1 independently from one or more brake lamps connected to the joint portion and the normally closed terminals of the two three-contact brake switches. It comprises output lines 22, 22 '.

However, in the above-described brake switch circuit, detection at the time of failure when the brake switch signals of the front and rear wheels are taken in is not performed at all locations. For example, if a disconnection occurs at point A in the figure (b), the brake input will be Lo regardless of the ON / OFF state of the brake switch 21.
Because of w (hereinafter referred to as L), the control circuit determines that the brake switch 21 is always ON, and cannot determine that a failure has occurred. In addition, there is a possibility that ride comfort and control performance may be reduced due to this.

This invention has been made in view of the current state of the above-mentioned conventional brake switch circuit for motorcycle anti-lock control, and its purpose is to provide not only two brake switch signals for the front and rear wheels but also a joint portion of the brake switch circuit. An object of the present invention is to provide a brake switch circuit for a two-wheeled vehicle anti-lock control device capable of extracting a brake signal and detecting all failures.

[Means for solving the problem]

Therefore, in this invention, the common terminal of the brake switch is connected to the power supply as an output to solve the above problem,
The normally open terminal is connected to a brake lamp, the normally closed terminal is connected to an antilock control circuit, and two three-contact brake switches for front and rear wheels are provided in parallel with each other, and are connected to the normally open terminals of the two brake switches. A brake switch circuit comprising one or more brake lights, a normally closed terminal of the brake switch, and an output signal line respectively connected to a joint connecting the normally open terminals of the brake switches for the front and rear wheels and the brake lights. This is the structure adopted.

[Operation] In the brake switch circuit configured as described above, when the normally-closed terminals of the three-contact switches provided in parallel with each other are switched on, the brake switch signal is output from each terminal to the output line independently. Accordingly, the brake switch signal for the front wheels and the switch signal for the rear wheels are discriminated and sent to the antilock control circuit.

In the anti-lock control circuit, a signal representing the wheel speed is sent from a sensor, and based on these signals, a wheel speed, a reference wheel speed (estimated vehicle speed), a vehicle acceleration, a slip ratio, and the like are calculated, and based on the calculation result, pressure is applied. , And outputs a control signal such as pressure reduction. In this case, in a two-wheeled vehicle, the front wheels are generally non-driving wheels and the rear wheels are driving wheels. Therefore, the reference wheel speed is estimated and controlled using the wheel speed of the front wheel that is unlikely to cause wheel slip or the like. Therefore, the brake switch signal for the front wheels is particularly important. For example, when the front wheel brake is ON, it is difficult to accurately detect the reference wheel speed, so special measures are required.

Therefore, if it becomes possible to output the brake switch signals of the front and rear wheels separately as described above, the calculation in the antilock control circuit is performed based on more accurate information.

In addition, in the present invention, in addition to the brake signal from the two three-contact brake switches, an output line from the joint is provided, so that a failure such as disconnection occurs in any of the output lines from the two three-contact brake switches. However, since the failure can be detected by the output line from the joint, all the failures can be detected more accurately, and a safe operation can be obtained.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of an entire circuit in which a brake switch circuit according to the present invention is added to a motorcycle antilock control circuit 1. The antilock control circuit 1 for a motorcycle according to this embodiment is obtained by adding an interface circuit 9 "to the conventional example.

Therefore, similarly to the conventional example, the antilock control circuit 1 sends the wheel speed signals of the wheel speed sensors S ₁ and S ₂ to the central processing unit 4 (hereinafter referred to as CPU) via the interface circuits 2 and 3. Performs various calculations such as wheel speeds, reference wheel speeds (estimated vehicle speeds), vehicle accelerations, slip ratios, etc., and provides output signals such as pressurization and decompression to the drive circuits 5 and 6 based on the calculation results. The electromagnetic valves 7, 8 are opened and closed to control the brake device. 9, 9 'are interface circuits, and 10 is a power supply circuit.

In this control circuit, when the brake is braked during traveling, the vehicle speed is also reduced by the pressurization command, but if the wheel speed decreases below the reference wheel speed, the slip ratio increases if the difference speed is more than a certain value. Therefore, in this case, a pressure reduction command is temporarily sent for a short period of time irrespective of the brake braking, and the solenoid valve 8 is opened to reduce the pressure. As a result, when the slip ratio approaches a predetermined value, a pressurization command is sent again, and the brake braking is most efficiently performed by repeating this command.

The brake switch circuit of this embodiment, which sends a brake signal to the above-described antilock control circuit 1, has two brake switch circuits for front and rear wheels connected in parallel to each other by connecting a common terminal of the brake switch to a power supply as shown in the figure. Contact brake switches 21, 21 'and two brake lamps 13, each having one of the parallel contacts of the brake switch connected to a joint 12 connected thereto and provided in parallel with each other;
13 '. The normally closed terminals and joints of the brake switches are provided with output lines 22, 22 ', 22 "for independently sending switch signals. These output lines 22, 22', 22" are connected to an antilock control circuit. 1
Are connected via interface circuits 9, 9 ', 9 ". The interface circuit 9" is connected at an intermediate point 12' of the joint portion 12.

In the interface circuits 9, 9 ', 9 ", the resistor A is grounded to the ground (pull-down resistor) B
To the power supply A of the control circuit through the resistor (pull-up resistor)
It is connected to the power supply of the control circuit through the resistance of C (pull-up resistance), thereby driving the transistors of the interface circuit.

In the brake switch circuit of this embodiment, not only can the brake switch signals of the front and rear wheels be independently taken into the antilock control circuit, but also the detection at the time of disconnection can be performed.
A more accurate antilock control operation can be expected.

The brake switch circuit configured as described above takes out the output line from the joint portion 12 in addition to the output line connected to the normally closed end of the front and rear wheel brake switches provided in parallel with each other. In the case of the disconnection at point A, the ON / OFF of the rear wheel brake switch can be determined from the brake signal from the joint unit 12 in the state where the front wheel brake switch is OFF.

The disconnection detection at other points can also be detected based on the brake switch states of the front and rear wheels and the input state of the antilock control circuit.

Specifically, considering the brake signal of the control circuit at the failure location of the disconnection and the ground short as shown in FIG. 2, the following table is obtained.

If you look at the above table, for example, if it is a place, 21 = ON,
Since the pattern other than the normal pattern is obtained when 21 '= OFF, disconnection can be detected. It is clear from this table that other parts can be detected. That is, one of the four combinations of the switches is the same as that of the switch having the normal pattern.
If there is a case that does not match all of the patterns occurring in the combination, the failure can be detected.

Is a disconnection fault (open), and is a ground short fault. The failure of the output line 22 'can be detected in the same manner as the output line 22.

Can be easily detected by the driver because the lamp does not turn on, and the other lamp operates normally in terms of function.

〔effect〕

As described above in detail, in the brake switch circuit according to the present invention, the output line of the brake switch signal is connected to the normally closed terminals of the front and rear wheel brake switches and the joint portion connecting the normally open terminals of the two brake switches and the brake lamp. By taking out from three points,
In addition to being able to output the brake switch signals of the front and rear wheels independently and detecting failures such as ground shorts and disconnections in all parts of the brake switch circuit, anti-lock control is immediately performed when a failure is detected. There is an advantage that it is possible to stop and switch to the normal foot brake control state.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of an antilock control circuit provided with a brake switch circuit according to the present invention, FIG. 2 is a diagram showing the possibility of a break in the control circuit, and FIG. 3 is a conventional antilock control. FIG. 3 is a schematic diagram showing a method of taking a brake switch signal into a circuit, and FIG.
(B) is an example of the device. 1 ... Anti-lock control circuit, 9, 9 ', 9 "... Interface circuit, 12 ... Joint, 12' ... Midpoint, 13, 13 '... Brake lamp, 21, 21' ... 3 contacts Brake switch lamp, 22, 22 ', 22 "... Output line.

Claims (1)

(57) [Scope of request for utility model registration] A common terminal of a brake switch is connected to a power supply, a normally open terminal is connected to a brake lamp, and a normally closed terminal is connected to an anti-lock control circuit. Switch and this 2
One or more brake lights connected to the normally open terminals of the two brake switches, the normally closed terminals of the brake switches, and the joints connecting the normally open terminals of the brake switches for the front and rear wheels and the brake lights, respectively. A brake switch circuit for a motorcycle anti-lock brake control device, comprising: