JPH029982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a rotation detector that detects the rotational speed of wheels on both sides of a vehicle, and a rotation detector that is connected to each of these rotation detectors and detects the deceleration of the wheels. a regulating circuit that processes the output signal of the rotation detector and generates a braking pressure adjustment signal when the limit value is exceeded, including a limit value circuit for slip and acceleration; and an output amplifier and a braking pressure regulator connected to these regulating circuits, respectively. The present invention relates to a circuit arrangement for anti-stick vehicle braking, comprising a solenoid valve and a braking circuit that respectively forms a braking pressure for both wheels in response to an output signal of a regulating circuit.

[Conventional technology]

In such a device, it is advantageous that short braking distances are obtained if the braking pressures of the two wheels are adjusted individually by means of regulating circuits belonging to each of these wheels (individual regulation). However, if the road friction coefficients of the wheels on both sides of the vehicle are different, this anti-sticking adjustment has the disadvantage that the yaw moment about the vertical axis of the vehicle increases and directional stability is lost.

It has also been proposed to jointly adjust the braking pressure of the brake circuits belonging to wheels that do not yet show a tendency to stick, with the adjustment circuits of wheels that show a tendency to stick earlier during braking. This is called low selection adjustment, and either one
If one wheel shows a tendency to stick, brake pressure is adjusted for all wheels.

Such low selection adjustment has the advantage of keeping the yaw moment small even if the road friction coefficients on both sides of the vehicle are different, but it also reduces the braking pressure to match the wheel that shows the earliest tendency to stick. This has the disadvantage that the braking distance becomes longer.

Now, in certain types of vehicles, such as semi-trailer or freight vehicles, directional stability may be lost if a yaw moment occurs when the tractor is traveling without a trailer or without a load (hereinafter referred to as unloaded travel). Or there is a risk of skidding. In these vehicles, most of the load is on the front axle, and the less loaded rear axle does not contribute much to directional stability.

[Problem to be solved by the invention]

An object of the present invention is to shorten the braking distance as much as possible in a semi-trailer or a freight vehicle when the trailer is towed by a tractor or when the freight vehicle is loaded with cargo, and to reduce the braking distance when traveling unloaded. The aim is to reduce the risk of loss of directional stability and skidding due to moments.

[Means to solve the problem]

In order to solve this problem, the present invention provides a discrimination circuit that compares the amount of electricity related to the load of the vehicle with the amount of electricity of a predetermined value and generates an output signal only when the load is less than or equal to the predetermined value; A joint connection device is provided which connects both regulating circuits together to one and the other braking circuit, respectively.

〔Effect of the invention〕

Thus, according to the invention, during braking when traveling without a load, large yaw moments are avoided by means of a low selective adjustment and directional stability is maintained, and when braking when traveling with a load, where only small yaw moments occur. braking distances can be shortened by individual adjustment.

〔Example〕

Rotation detector 120 for a semi-trailer or truck detects the rotational speed of the wheels on one side of the vehicle, and rotation detector 122 detects the rotational speed of the wheels on the other side. The output signals of detectors 120 and 122 are output to conditioning circuits 124 and 126, respectively.
In these regulating circuits, the output signals of the detectors are processed by limit value circuits for wheel deceleration, slip and acceleration to form a regulating signal for the braking pressure. The output signals of regulation circuits 124 and 126 are provided to brake circuits 136 and 138, respectively, which include a power amplifier and a brake pressure regulating solenoid valve.

According to the invention, the joint connection device which connects both regulating circuits 124, 126 together to one and the other braking circuit 138, 136 only at loads below a certain value of the vehicle comprises two logic coupling circuits 132,
Contains 134. Logic combination circuits 132, 13
4 are AND gates 14 each belonging to the adjustment circuit.
2,142', its two inputs are respectively connected to the regulating circuit 124 or 126 to which it belongs and the discriminating circuit 170, and its output provides the output signal of the respective regulating circuit to the braking circuit.
It is connected to the other input terminal of OR gates 143 and 143'.

The discrimination circuit 170 that discriminates the load state of the vehicle includes a potentiometer 171, and detects the deflection of the suspension spring related to the load of the vehicle, the lever position of the brake force regulator (ALB) related to the load, or the pressure before and after the ALB. Depending on the difference, a variable voltage related to the load is taken from the movable tap of this potentiometer 171 and compared with a reference voltage corresponding to the predetermined load. When the load of the vehicle is less than a predetermined value and, for example, a semi-trailer tractor or a truck is running unloaded as described above, the voltage taken out from the movable tap exceeds the reference voltage, so the discrimination circuit 170 outputs Generate a signal. Thereby
AND gates 142 and 142' are enabled to conduct and control circuits 124, 122 during the braking process.
A signal generated from one of the brake circuits 136 and 138 is applied to both brake circuits 136 and 138 to effect brake pressure adjustment. That is, when driving without a load, the adjustment circuit 124 or 126 belongs to the wheel that tends to stick earlier during braking, and therefore has a lower coefficient of road friction.
signal causes both braking circuits 136 and 13
8 will be adjusted together (low selection adjustment).

On the other hand, when traveling with a load, the determination circuit 170 does not generate an output signal, so that individual adjustments are made as described above.

[Brief explanation of drawings]

The figure is a configuration diagram of an embodiment of the present invention. 120, 122... Rotation detector, 124, 12
6... Adjustment circuit, 132, 134... Co-connection device, 136, 138... Braking circuit, 170... Discrimination circuit.

Claims (1)

[Scope of Claims] 1. A rotation detection device that includes rotation detectors that detect the rotational speeds of wheels on both sides of the vehicle, and limit value circuits for wheel deceleration, slippage, and acceleration that are connected to these rotation detectors, respectively. a control circuit that processes the output signal of the controller and generates a brake pressure control signal when a limit value is exceeded; and an output amplifier and a brake pressure control solenoid valve connected to these control circuits, respectively. and a braking circuit that respectively forms braking pressures for both wheels accordingly, compares the amount of electricity related to the load of the vehicle with the amount of electricity of a predetermined value, and outputs an output signal only when the load is less than or equal to the predetermined value. A discriminator circuit 170 generates the output signal, and both adjustment circuits 124, 12 depending on this output signal.
6 together with one and the other braking circuit 136,1
Co-connecting devices 132, 1 respectively connected to 38
34. A circuit device for anti-sticking vehicle braking, characterized in that it is provided with: 34. 2. The joint connection device connects one logic coupling circuit 132 connecting one regulating circuit 124 to another braking circuit 138 and the other logic coupling circuit 134 coupling one regulating circuit 126 to one braking circuit 138.
and these logic coupling circuits 132, 134.
are AND gates 142, 142' and
It includes OR gates 143 and 143', and the two input terminals of the AND gate 142 of one logical combination circuit 132 are connected to the adjustment circuit 126 and the discrimination circuit 1 of the other.
The output terminal of this AND gate 142 and the output terminal of one of the adjustment circuits 124 are respectively connected to the two input terminals of the OR gate 143 of this logic combination circuit 132, 2 of AND gate 142' of coupling circuit 134
The two input terminals are connected to the output terminals of one of the adjustment circuits 124 and the discrimination circuit 170, respectively.
The output terminal of AND gate 142' and the other adjustment circuit 1
26 is connected to the output terminal of this logic coupling circuit 134.
Device according to claim 1, characterized in that it is connected respectively to two inputs of an OR gate 143'. 3. The discrimination circuit 170 determines whether or not the determination circuit 170 responds to the deflection of the suspension leaf spring of the vehicle, which changes depending on the load state of the vehicle, the lever position of the braking force regulator, which changes depending on the load, or the pressure difference between the front and rear of the braking force regulator. Claim 1, characterized in that the potentiometer includes a potentiometer having a movable tap that is moved by a potentiometer, and a comparator circuit that compares the voltage drawn from the movable tap with a predetermined reference voltage. The device described.