Device for verifying disturbances in signal transmission in motor vehicles

• US 5,463,373 A
• Filed: 01/26/1993
• Issued: 10/31/1995
• Est. Priority Date: 01/30/1992
• Status: Expired due to Fees

• Current Assignee: Mannesmann Kienzle GmbH
• Original Assignee: Mannesmann Kienzle GmbH
• Inventors: Widl, Gerhard, Fichter, Manfred
• Primary Examiner(s): Swarthout, Brent
• Application Number:
  US08/008,916
• Time in Patent Office: 1,008 Days
• Field of Search: 340/466, 340/441, 340/439, 340/444, 340/434, 364/424.01, 364/424.03, 364/424.04, 364/426.02, 364/426.03, 364/426.04, 364/431.07, 364/565, 377/28, 324/161, 324/172, 324/166
• US Class Current: 340/441
• CPC Class Codes: G01P 13/00 Indicating or recording presence, absence, or direction, of movement electric switches H01H; counting moving objects G06M7/00
• CPC Class Codes: G07B 13/02 Details; Accessories
• CPC Class Codes: G07C 5/0841 Registering performance data recording measured values G01D; information storage G11B

Abstract

A device is disclosed which can detect and document tampering in the signal transmission path between speed measurement and/or mileage counting devices and the speed transmitters which are associated with these devices using the simplest possible means and so as to be suitable for large-scale series manufacture. The device provides that at least one movement transmitter, which senses forces which are typical of driving, is arranged inside the respective measurement device, and that an evaluating circuit is also provided, which delivers a signal which controls a recording arrangement when signals of a speed transmitter do not correspond with those of the movement transmitter.

Claims

1. A device for verifying disturbances in signal transmission in motor vehicles, particularly the signal transmission between speed measurement and/or mileage counter devices and speed transmitters which are arranged external to said devices, which comprises:

a speed transmitter;

at least one movement transmitter;

a recording arrangement;

a measurement device associated with said at least one movement transmitter; and

an evaluating circuit,

wherein said at least one movement transmitter senses forces which are typical of driving, and further wherein said at least one movement transmitter is arranged inside said measurement device associated therewith, and further wherein said evaluating circuit supplies a disturbance signal which controls said recording arrangement when signals of said speed transmitter do not correspond with signals of said movement transmitter, wherein said evaluating circuit supplies a disturbance signal when a pulse of said at least one movement transmitter, which is stored in said evaluating circuit, is not canceled by a pulse of said speed transmitter after a determined period of time so as to verify a disruption of signals from said speed transmitter, wherein said evalating circuit further comprises;

a flip-flop stage the set input of which is associated with said at least one movement transmitter and the reset input of which is connected with a signal input of said speed transmitter,

wherein a timer is provided which is controllable by pulses of said movement transmitter, and further wherein an output of said movement transmitter is linked with an output of said flip-flop stage via an AND operation, wherein said device further comprises;

a frequency transformer, wherein said frequency transformer is connected to said reset input of said flip-flop stage, and further wherein said frequency transformer has a pitch ratio such that pulse pauses associated therewith are shorter than a switching period of said timer at an output of said frequency transformer at a low driving speed.

2. A device for verifying disturbances in signal transmission in motor vehicles, particularly the signal transmission between speed measurement and/or mileage counter devices and speed transmitters which are arranged external to said devices, which comprises:

a speed transmitter;

at least one movement transmitter;

a recording arrangement;

a measurement device associated with said at least one movement transmitter; and

an evaluating circuit,

wherein said at least one movement transmitter senses forces which are typical of driving and further wherein said at least one movement transmitter is arranged inside said measurement device associated therewith, and further wherein said evaluating circuit supplies a disturbance signal which controls said recording arrangement when signals of said speed transmitter do not correspond with signals of said movement transmitter,

wherein said evaluating circuit determines, with the aid of signals from said speed transmitter and said at least one movement transmitter, whether a change in speed of said vehicle was effected at least one of during and after an acceleration phase in order to verify a simulated speed profile.