JPS6288605A - Method and device for adaptation-adjusting or controlling parameter of chassis device for surface travelling car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention 8A relates to the production of electricity by carrying out the method and seven methods described in the generic concept described in item 1 of the scope of the B# discussion.

PRIOR ART Chassis mounting parameters, i.e., splash stiffness and damping. In modern road vehicles, comfort and damping parameters are important only if they are constant and vary over time depending on the unevenness of the road being traveled. It is possible to optimize driving safety. Since it is difficult to directly detect road surface irregularities with a corresponding technical and economic burden, the method according to the generic concept of claim 1 or the apparatus for implementing this method (e.g. U.S. Patent No. 3,606,365, B.
2O317104) is known. In these methods and devices, signals are formed from the vertical acceleration of the vehicle 1d4 through bandpass filters in a delimited frequency range, and these signals When this occurs, a switching action occurs in the area of the hydraulic chassis suspension that maintains the vehicle structure in a predetermined horizontal plane.

In other words, these known methods ultimately take into account the fact that the unevenness of the road surface includes a so-called frequency spectrum l, and the frequency Ω (unit: Horse-1) is used. Road surface unevenness χ
Defined by the following formula.

In the formula, the coefficient Ao (Ω) is the reference frequency Ωo wm 1rI
It is a measure of the unevenness component in L″″λ, that is, the output density component, and is complementary to the unevenness of the road surface. The index W is determined based on the dependence of the unevenness density on the frequency according to the above formula. That is, when the value of W is high, the uneven component of long waves (low frequency) is high and the value of W is small, the uneven component of short waves (high frequency I!) is relatively high.The letter W indicates the uneven waveform YE' of the road surface. Ao(Ω)
is obtained by multiplying the degree of unevenness Ao (Ωo) by a value that changes with frequency and depends on the waveform according to the formula.

In the prior art, the degree of roughness is detected in an indirect manner, although a bandpass filter is used to select a predetermined frequency range via the detection of the vertical acceleration of the vehicle structure. As a result of research conducted in accordance with the present invention, it has been found that such a method does not detect road surface characteristics that cause movements of the vehicle structure.

Problems to be Solved by the InventionThe fundamental problem of the present invention is that the individual flatness of each surface can be solved by simple means such as the convenience of a computer installed in a vehicle. allows to detect
The object of the present invention is to provide a method having the paulownia W described in the generic concept of claim 1, and a circuit arrangement for implementing the seventh method.

Means for Solving the Problem The above problem is solved by the features described in the first and fourth claims.

Preferred embodiments of the method according to the invention are set out in the claims 1 and 2.

The acceleration sensor can optionally be designed as a speed measuring device, which is downstream connected to a differential circuit membrane.

The method by Akira Shimoto, which is different from known methods and devices, does not detect the degree of unevenness in the sense of the above definition, but rather detects the relative m-composition of the unevenness density between the long wave component and the short wave component of the frequency. To detect. Furthermore, by detecting the vertical acceleration at the wheel, the uneven waveform W in the meaning of the above definition of i[li body is detected. The filter output signals B1 and B2 indicate an output density Z which is the second-order time derivative of the change in road surface roughness at both (temporal) frequencies 1 and 2. The purpose is to detect vibrations of the wheels. For example, I Hg
The vibration of the wheel in the vehicle-dependent frequency range between BHIl and BHIl is proportional to the unevenness of the road surface on which it is biased.

Example: Output signal of a sensor that detects vertical single wheel acceleration caused by unevenness on a running road! ``Represented by I-(t).

This signal depends on time t. This signal is fed to both narrowband filters 1 and 2. These narrow band filters 1 and 2 are connected in parallel and the filter 2 is tuned to a frequency of 2. The components of the sensor output signal at both these frequencies are obtained in the output signals B1 and B2 of both narrowband filters 1 and 2. They are set to the effective value "off" by the effective value forming circuits 3 and 4.
1 and X. Processed to 2,2. The effective value is logarithmized by logarithm forming circuits 5 and 6. Both logarithm forming circuits 5 and 6
Since the output 913 of is connected to the input side of the subtraction circuit 70, a signal proportional to the value in parentheses in the following equation is supplied to the input side of the addition circuit 8.

−[1og x, t t (f 2 ) −Lo g
x8tt (f 1 ) ] ·k + 4 where k is a constant.

A constant value ("4") is added to this value in the adder circuit 8, so that on the output side, a signal for waveformity is used to control or adjust traveling gear parameters such as spring stiffness and damping degree. is taken out ゐ0

[Brief explanation of drawings]

The figure is a circuit diagram illustrating an embodiment of a calculation circuit for implementing the method of the invention. 1.2... Narrow band filter, 3.4... Effective value forming circuit, 5.6... Logarithm forming circuit, 7... Differential amplifier, 8... Adding circuit.

Claims (1)

[Scope of Claims] 1. A method for adaptively adjusting or controlling chassis device parameters of a road vehicle depending on road surface irregularities, the method comprising: adjusting or controlling an adjustment signal or a control signal from the output of at least one vertical acceleration sensor in the vehicle; A method for adaptively regulating or controlling chassis system parameters of a road vehicle as a function of road surface irregularities, which is formed by frequency-dependent filtering of a signal. Determine the dependent vertical acceleration (■(t)) and convert the output signal to different passing frequencies (
Two narrowband filters (1, f2) tuned to f1, f2)
2) and combines the filter output signals (B1, B2) to form an adjustment or control signal determined by the components of the filter output signals (B1, B2) and thus by the longwave and shortwave components of the road surface unevenness spectrum. A method for adaptively adjusting or controlling chassis parameters of a road vehicle, characterized in that: 2. Effective value (X_e) of filter output signal (B1, B2)
_f_f1,
]/[log(f(1)/f(2))]+4=[2lo
g(X_e_f_f(f2)/X_e_f_f(f1)
]/[log(f1/f2)]+4=[logx_e_
f_f(f2)-logx_e_f_f(f1)]・k
+4, where k is combined according to a constant. Adaptive adjustment or control method for chassis device parameters of a road vehicle according to claim 1, wherein the passing frequency (f1, f2) is between 1 Hz and 8 Hz. A method for adaptively adjusting or controlling chassis parameters of a road vehicle according to claim 1 or 2. 4. A device for adaptively adjusting or controlling chassis system parameters of a road vehicle depending on road surface irregularities, comprising first and second narrow band filters (1, 2) respectively of at least one vertical acceleration sensor of the vehicle; one effective value forming circuit (3
, 4) and one logarithm forming circuit (5, 6) are connected,
The effective value forming circuit (3, 4) and the logarithm forming circuit (5, 6)
) is connected to the input side of a subtraction circuit (7), and an addition circuit (8) for an addition constant (“4”) is connected downstream to the subtraction circuit (7). Adaptive adjustment or control device for chassis equipment parameters of road vehicles