Device for monitoring the closure of the opening points of a motor vehicle

• US 5,250,849 A
• Filed: 06/04/1991
• Issued: 10/05/1993
• Est. Priority Date: 06/05/1990
• Status: Expired due to Fees

• Current Assignee: Rockwell Automotive Body Systems - France
• Original Assignee: Rockwell Automotive Body Systems - France
• Inventors: Periou, Pierre
• Primary Examiner(s): Gaffin, Jeffrey A.
• Application Number:
  US07/709,938
• Time in Patent Office: 854 Days
• Field of Search: 307/10.1-10.5, 307/116, 307/130, 340/426-430, 340/825.31, 340/825.32, 340/825.34, 340/438, 340/457, 340/644, 340/686, 116/12, 116/28 R, 116/86, 180/286, 180/287, 180/289, 361/171, 361/172, 361/187, 70/237, 70/256, 70/257, 70/264
• US Class Current: 307/10.1
• CPC Class Codes: E05B 77/48 by electrical means
• CPC Class Codes: Y10T 70/5978 With switch
• CPC Class Codes: Y10T 70/65 Central control

Abstract

The invention relates to a device for monitoring the closure of the opening points of a motor vehicle, in which each opening point is equipped with a closure contact which is connected to a central unit. It is characterized in that the central unit is connected to all the opening points by a single common line (8) with two conductors (31, 32), in that the central unit comprises at least one periodic-signal generator (28) connected to the said two conductors, in that each opening point comprises a passive receiver circuit tuned to the frequency of the periodic signal supplied by the said generator (28) of the central unit, the said passive circuit being connected in series with the closure contact of the said opening point, and in that the said device comprises, furthermore, indicia of a closure fault in response to the variations of the signal generated by the generator in response to the actuation of the corresponding closure contact.

Claims

1. Device for the centralized control and monitoring of opening points (2, 3, 4) of a motor vehicle in which the opening points have electrical motors (M1, M2) and a closure contact which are connected by means of a single common line (8) having three conductors (31, 32, 33) to a central control unit, the central control unit (1) comprises at least one periodic signal generator connected to conductors (31, 32) and each opening point (2 through 4) comprises a passive receiver in unit (17, 18) tuned to the frequency of the periodic signal supplied by the generator (28) of the central unit (1), the passive circuit being connected in series with the closure contact (19) of the opening point, the device comprises means for signaling a closure fault which is sensitive to the variations of the signal generated by the generator in response to the actuation of the corresponding closure contact (19) and first motor (M1) connected between two conductors (12, 13) of the line (8) and a second motor (M2) connected directly to one of said two conductors (12, 13) and connected to the other of these conductors through a first diode (D1), the cathode of which is connected to the said second motor, and a second diode (D2) is connected between the terminal of the second motor (M2) and said third conductor (11) of the line (8), the anode of this second diode being connected to the second motor (M2).