JPH037655A - Brake aid device for vehicle - Google Patents

Abstract

PURPOSE:To prevent issue of unnecessary warning by forming a brake aid device for car which holds the brake in applied condition through encapsulation of the braking pressure, and therein actuating a warning means only when the encapsulated pressure in a valve is below a certain specified level and no foot of the driver is put on the brake pedal. CONSTITUTION:When a brake pedal is being stamped more than one second after the car is stopped, a judging circuit 1 actuates a solenoid valve and encapsulates the brake pressure in it, and thus the car is kept at a standstill. After judging from an encapsulate signal 3 whether or not the brake pressure is being encapsulated, the judging circuit 1 judges whether or not the braking pressure in the valve is sunk. From a brake signal 4 thereafter, it is judged whether or not the driver's foot is put on the brake pedal: If yes, no output command is given to the warning means 2 even though the braking pressure has been sunk, and if no, output command is given to the warning means 2 about the sink of the braking pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a braking auxiliary device for a vehicle, and particularly to a technique that can reduce unnecessary warnings due to insufficient pressure in a brake valve.

[Traditional technique]

As this type of braking auxiliary device, an electromagnetic valve is installed between the master cylinder and the wheel brake, and the brake fluid pressure is contained within the valve when the brake pedal is depressed, and when the brake pedal is released. A system that can maintain a braking state has been proposed.

For example, in order to maintain the braking state of a private medium-sized vehicle on a gentle downhill slope, it was necessary for the hydraulic pressure to be continuously contained within the valve at a certain level or higher. The above-mentioned braking auxiliary device prevents the creep phenomenon (
In order to prevent so-called sluggish starts, it is necessary to constantly detect the pressure contained within the valve, and if the pressure is less than the required braking pressure, a warning such as a buzzer or lamp is used to prompt the driver to press the brake pedal. there were.

[Problem to be solved by the invention]

However, since the above-mentioned conventional technology detects only the confinement pressure inside the valve, a warning is issued frequently even when the driver's foot is on the brake pedal, which may actually cause problems in driving. There were concerns that this could distract people and lead to a decline in safety.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a vehicle braking auxiliary device that maintains a braking state by sealing the braking pressure generated by pressing the brake after the vehicle is stopped in a valve, and employs the following means.

That is, the judgment circuit 1 includes a judgment circuit 1 and a warning means 2 connected to the judgment circuit 1, and the judgment circuit 1 receives a confinement signal 3 for detecting the containment pressure in the valve, and a signal 5 for detecting the containment pressure in the valve when the driver's foot is placed on the brake pedal. A vehicle that manually operates a brake signal 4 that detects that the vehicle is running, and activates the warning means 2 only when the containment pressure in the valve is below a certain value and the driver's foot is not placed on the brake pedal. A braking aid and a brake aid.

[Effect]

=3 According to the above-mentioned method, even if the containment pressure inside the valve is low, if the driver's foot is on the brake pedal and the driver is conscious of depressing the brake pedal, No warning will be issued. therefore,
Unnecessary warnings can be prevented and the driver's attention can be focused on driving.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing a braking auxiliary device for a vehicle which is an embodiment of the present invention, and FIG. 2 is a flow diagram showing a determination procedure in the determination circuit of FIG.

In FIG. 1, the judgment circuit 1 is, for example, a unit type ECU (Electronic Control
ROM (Read 0nl) as part of
y Memory), and outputs a signal when certain conditions are met based on two systems of human input signals.

The warning means 2 is, for example, a buzzer, a lamp, or an LED.
(Light Emitting Diode) etc., which give an auditory and visual warning.

1 in the same figure, the judgment circuit 1 has a human input signal and (J
The containment signal 3 and brake signal 4 are manually operated. For example, this containment signal 3 becomes 1 when the hydraulic pressure in the valve is below the required braking pressure, and in other cases,
This is a binary signal that becomes "0".

On the other hand, the brake signal 4 is a 2fi signal that detects the position of the brake pedal and becomes "1" when the driver's foot is placed on the brake pedal, and becomes '0' in other cases. Note that the containment signal 3 may be an analog value from a pressure sensor (not shown). In this case, it is necessary to provide an A/D conversion circuit, an amplifier circuit, etc. in the judgment circuit 1.

Prior to the operating procedure shown in Figure 2, the ECU detects that the vehicle has stopped, and if the brake pedal is depressed for more than 1 second after the vehicle has stopped, it activates the electromagnetic valve to release water into the valve. Contain brake pressure. As a result, the vehicle remains stopped even if the driver takes his or her foot off the brake pedal.

In this state, the determination circuit 1 starts the process shown in FIG. 2 (step 201). The judgment circuit 1 first judges whether the electromagnetic valve is in an operating state, that is, whether brake pressure is contained (202), and if it is contained, whether the brake pressure in the valve is decreasing or not. (203). Next, based on the brake signal 4, it is determined whether the brake pedal is at a position moved from the neutral position, that is, whether the driver's foot is on the brake pedal (204). does not issue an output instruction to the warning means 2. At this time, if the warning means 2 is already warning, the warning is stopped (206).

Further, in step 204, if the driver's foot is not on the brake pedal, the driver is not conscious of pressing the brake pedal, so the warning means 2
Give output instructions to lamp 1, LED, buzzer,
5-6 (205) which issues a warning such as a voice.

As a result, in this embodiment, if the driver's foot is on the brake pedal and the driver is conscious of depressing the brake pedal, no warning is given, so unnecessary warnings can be prevented.

〔Effect of the invention〕

According to the present invention, unnecessary warnings can be prevented in a vehicle, and the driver's attention can be focused on driving.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a braking auxiliary device for a vehicle which is an embodiment of the present invention, and FIG. 2 is a flow diagram showing the top of the judgment hand 11 in the judgment circuit of FIG. 1... Judgment circuit, 2... Warning means, 3... Containment signal, 4... Brake signal.

Claims (1)

[Claims] (1) A braking auxiliary device for a vehicle that maintains a braking state by containing the braking pressure generated by pressing the brake after the vehicle has stopped in a valve, comprising a judgment circuit 1 and a warning means 2 connected to the judgment circuit 1, Circuit 1 inputs a containment signal 3 that detects the containment pressure inside the valve and a brake signal 4 that means that the driver's foot is placed on the brake pedal, and when the containment pressure inside the valve is below a certain value. A braking auxiliary device for a vehicle, characterized in that the warning means 2 is activated only when the driver's foot is not placed on the brake pedal.