The present invention relates to apparatus for the simulation of a ride on a curved road using a screen for the picture of the road observed in perspective by the driver as well as using a program for the generation of the road picture as well as using controldevices such as an accelerator pedal, a brake pedal, a clutch_ pedal, a gear shift lever and a ruler which are devices that influence the road picture, as well as using computing devices for the computation of the speed signal, the rotation signal, the acceleration signal and the signal for the centrifugal acceleration, according to U.S. Pat. No. 4,077,138,-Foerst, issued Mar. 7, 1978.
Simulators are known with which the monitor picture reacts optically and the loudspeakeracoustically on activation of the control devices, but withtwhich no mechanical reactions on the driver occur._The disadvantage of such simulators is, that the driver regretfully lacks any simulation of the missing acceleration forces of real driving. The illusion of a real car ride consequently is imperfect.
Such simulators are described specifically in U.S. Pat. No. 4,077,138-Foerst, in U.S. Pat. No. 4,196,528-Foerst issued Apr. 8, 1980 and in copending U.S. patent application Ser. No. 165,408-Foerst filed July 2, 1980.
Therefore, it is an object of the present invention, to economically extend and improve the already‘ known simulators by such devices which create for the driver the bodily perceptible feeling of the centrifugal acceleration at the time of travelling in a curve while driving, of the acceleration and the slowing down upon activation of the accelerator and brake pedals, and of the vibration of the vehicle encountered with a rotating engine. '
Now, before the solution of this object is set forth, there can be explained briefly which forces dominantly affect the driver during .a real car ride:
At the time of travelling in a curve while driving, the centrifugal acceleration is effectively encountered. Direction of the centrifugal acceleration is horizontal and perpendicular to the track or direction of movement of the vehicle and is proportional to the product of track curvature and speed. During changes of the speed, the acceleration or the retardation occurs in track direction. During running or operation of an engine -there are effectively encountered periodical forces having frequencies which depend upon the rotation of the engine and such forces are effective in several directions.
This object, and other objects and advantages of the present invention will appear more clearly from the following specification in connection with the accompanying drawings, in which; r
FIG. 1 is a diagrammatic perspective view of the driving simulator apparatus of the present invention;
FIG. 2 is a block diagram of an embodiment of circuitry according to the present, invention; _ "
FIG. 3 is a block diagram of another embodiment of
FIG. 8 shows an example of an embodiment of a driving simulator apparatus according to the present invention;
FIG. 9 shows an example of another embodiment of a driving simulator apparatus according to the present invention; ' ' _
FIG. 10 shows an exampleof a further embodiment of a driving simulator apparatus according to the present invention. , I I
Referring now to the drawings in detail, FIG. 1 shows a cabin or cab 248 which includes therewith a screen 1, control devices comprising a steering wheel 8, an accelerator pedal 11, a brake pedal 12, a clutch pedal 13 and a gear shift lever 14 and the driver's seat 254 from where the road picture can be observed and controlled; the cabin 248 is capable of being swivelled around an axis which is parallel to the viewing direction and above the center of gravity of the driver. The cabin 248 is driven by a power drive 250 dependent upon a single bpof centrifugal acceleration via a control amplifier 249 and by use of a measuring device 251 as well as a tipable back 253 which is driven by a power drive 256 dependent upon the acceleration signal b via a control amplifier 255 as well as elastic buffers bottom supports 262 which support the driver’s seat 254 and a vibrator 259 which is intermittingly switched on dependent upon a rotational signal n via a frequency divider 260 and a‘ control amplifier 261. ' '
One advantage of this embodiment is the economy thereof. The centrifugal acceleration which is effective horizontally, in reality is composed of factors in the simulation represented by the sum of a real horizontal acceleration and the horizontal component of the gravity in a sloping position. The sloping position, unwanted in principle, does not influence-the simulation effect too much since the monitor picture if also sloping, so that there is -noichange in the angle relatively between the horizon and the driver’s seat. The acceleration in longitudinal direction of the road is less relevant for the feeling of drivingthan the centrifugal acceleration-and therefore is simulated only by the pressure of the seal back against the driver’s back. Power drives 250 and 256 may be provided in the form of gear motors, rota