Measuring and testing – Speed – velocity – or acceleration – Centrifugal weight type
Patent
1988-03-31
1990-04-17
Williams, Hezron E.
Measuring and testing
Speed, velocity, or acceleration
Centrifugal weight type
73537, 73490, 340441, G01P 316, G01P 342
Patent
active
049169530
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for measuring a vehicle's movement.
Different devices exist for measurement of vehicle movements which can record the speed for a certain period of time and distance. Such devices have primarily aimed at informing the driver of a vehicle about this speed whilst in motion and registering the distance travelled. The latter is partly achieved by continuous measurement and partly by measuring from a starting point. This is known as a trip meter.
Speedometers are also found which record the speed of a vehicle and keep a record on a supporting medium. This enables the use of a vehicle to be checked retrospectively to determine whether the speed has exceeded specified limits. This method does not however provide an easy, accurate and secure way of knowing the speed in k.p.h. or how long the vehicle has exceeded a certain speed limit.
The development of faster vehicles, the increase in the traffic density and to some extent the change in driving attitudes regarding speed violations, have made it necessary to supervise speeding violations systematically and accurately in a way that can create a means of raising revenue from fines for the violations.
The main object of the invention is to create a device to measure the distance a vehicle has travelled at a certain, predetermined range of speed, particularly in excess of specified legal limits. The device should be able to register the total distance driven at different speed intervals, with the possibility of weighting the results according to a prespecified range of values. The device should be simple and robust so that the compulsory purchase price can be kept low.
Furthermore, it should be simple to install, reliable and maintenance free. It should be reliable in the sense that it is not possible to disconnect the registration function without leaving marks, such as breaking a seal for instance. The device should preferably be able to be used independently of external power supplies.
According to the invention this can be achieved by designing the device in accordance with the characterizing part of claim 1. The control signal can be an electronic signal or mechanical transmission of motion. Additional advantages of the invention are stated in the subsidiary claims.
Such a measuring device will make it possible to measure speeding violations so that they can create a means of raising revenue from fines. This assumes that such a measuring device is compulsory and is fitted in all the vehicles within specific categories, for example, passenger cars, delivery trucks, and motorcycles.
The invention can be constructed in different ways. In its simplest form, it can consist of a centrifugal gauge connected to a distance meter as described in the example below. It can also be supplied with its own power supply so that it can have an electronic measuring circuit. Furthermore, it is possible to combine mechanical and electronical-based methods of measurement. It is envisaged that a magnetic element could be employed to develop a satisfactory electromechanical gauge.
Example:
The invention will be described in more detail below with reference to the drawings where:
FIG. 1 is a block diagram illustrating the main elements in a design based on electronic elements, while
FIG. 2 is a schematic axial cross-section through a mechanical design based on a centrifugal measurement of the speed.
In FIG. 1, part of a motor vehicle A and a wheel B are indicated by broken lines. From the hub of wheel B, cables lead from a built-in tachometer 11 which emits a voltage which is proportional to the vehicle speed. The tachometer can also be connected to a drive head which rotates with a speed which is in a constant relation to the speed of the drive wheel, the transmission output axle for instance. An electrical cable 12 leads to a comparator 13 which compares the tachometer voltage with a reference voltage which equates to a certain speed, e.g. 90 k.p.h. The comparator 13, which can be built using existing design, will emit an output signal only when the
REFERENCES:
patent: 3860905 (1975-01-01), Guerini
patent: 4007438 (1977-02-01), Protonantis
patent: 4236142 (1980-11-01), Lindsey
patent: 4250487 (1981-02-01), Arnold
patent: 4608551 (1986-08-01), Takeo et al.
Bell Robert P.
Pittenger James E.
Williams Hezron E.
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