EP0068437B1
Expired / Lapsed
EP
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Keyless entry system for an automotive vehicle
Assignee: Nissan Motor Co Ltd
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Filing: 1982-06-23
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Granted: 1986-10-08
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Expires: 2002-06-23
Abstract
No abstract record available.
Inventors
- 👤 Haruo Mochida
- 👤 Hiroshi Nakakooji
- 👤 Hirotoshi Namazue
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 00:38
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00658; G07C9/00674; G07C9/0069
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
234 words
A keyless entry system for unlocking an automotive door lock, said system including - an input unit (10) for inputting a multi-digit input code, - first memory (14) storing a first preset code, -a first comparator means (12) electrically connected to compare the first preset code with the input code and to produce a first output signal when said input code matches with said first preset code, - a second memory (15) storing a second preset code, - second comparator means (13) electrically connected to compare the second preset code with the input code to produce a second output signal when said input code matches with said second preset code, - a door unlocking actuator (17) for operating said door lock to the unlocked position in response to said second output signal, and - means for allowing change of said second preset code with a combination of code elements inputted subsequently to the entry of said input code matching with said first preset code, characterized in that - only the output of said second comparator means (13) from both comparator means (12, 13) is connected to the door unlocking actuator (17), and in that - the output of the first comparator (12) is connected to a gate means (16) through which the input code is to be written into said second memory (15) after supplying said first output signal to the gate means (16).
Claim 2
Dependent Claim
234 words
A keyless entry system for unlocking an automotive door lock, said system including - an input unit (10) for inputting a multi-digit input code, - first memory (14) storing a first preset code, -a first comparator means (12) electrically connected to compare the first preset code with the input code and to produce a first output signal when said input code matches with said first preset code, - a second memory (15) storing a second preset code, - second comparator means (13) electrically connected to compare the second preset code with the input code to produce a second output signal when said input code matches with said second preset code, - a door unlocking actuator (17) for operating said door lock to the unlocked position in response to said second output signal, and - means for allowing change of said second preset code with a combination of code elements inputted subsequently to the entry of said input code matching with said first preset code, characterized in that - only the output of said second comparator means (13) from both comparator means (12, 13) is connected to the door unlocking actuator (17), and in that - the output of the first comparator (12) is connected to a gate means (16) through which the input code is to be written into said second memory (15) after supplying said first output signal to the gate means (16).
Claim 3
Dependent Claim
44 words
The keyless entry system as set forth in claim 1, characterized by a third means (19) for counting and recording the number of code elements constituting the second preset code, said means (19) updating said recorded value everytime said second preset code is changed.
Claim 4
Dependent Claim
44 words
The keyless entry system as set forth in claim 2, characterized in that the third means (19) for counting and- recording the number of code elements constituting the second preset code is responsive to said first output signal for resetting the recorded value therein.
Claim 5
Dependent Claim
73 words
The keyless entry system as set forth in claim 3, characterized in that the third means (19) for counting and recording the number of code elements constituting the second preset code produces a third output signal representative of the recorded number of code elements stored in said second memory (15), said second memory (15) being responsive to said third output signal in a mode for permitting read out of the second preset code.
Claim 6
Dependent Claim
53 words
The keyless entry system as set forth in any one of claims 1 to 4, characterized by an address signal generator (11) responsive to signals fed from said input unit (10) and producing address signals to access said first and second memories (14, 15) for reading out stored first and second preset codes.
Claim 7
Dependent Claim
54 words
The keyless entry system as set forth in claim 5, characterized in that said address signal generator (11) includes a counter (27) for counting up the number of signals inputted from said input unit (10) and said address signal produced therein represents the order of access in said first and second memories (14, 15).
Claim 8
Dependent Claim
57 words
The keyless entry system as set forth in claim 6, characterized by a reset signal generator (18) for producing a counter reset signal for resetting said counter (27) in said address signal generator (10), said reset signal generator (18) being responsive to said first output signal to produce said counter reset signal with a given delay time.
Claim 9
Dependent Claim
39 words
The keyless entry system as set forth in claim 7, characterized in that said third means (19) is responsive to said counter reset signal for starting the counting up of the inputted code elements after said counter reset signal.
Claim 10
Dependent Claim
48 words
The keyless entry system as set forth in claim 8, characterized in that said second memory (15) is placed in a write mode for writing therein the second preset code in response to said counter reset signal, said second preset code being inputted after said counter reset signal.
Claim 11
Dependent Claim
40 words
The keyless entry system as set forth in claim 9, characterized by a theft preventing circuit (13, 20, 21, 22) which inhibits input of said input code when the time between occurrence of said input codes exceeds a predetermined time.
Claim 12
Dependent Claim
117 words
The keyless entry system as setforth in claim 10 characterized in that said theft preventing circuit comprises fourth means incorporated with said second comparator means (13) for producing a fourth signal indicating that said input code is different from said second preset code, a counter (21) for counting up said fourth signal and for producing a fifth signal when the counter value exceeds a given value, a timer (22) responsive to said fifth signal for producing a timersignal having a given duration, and a gate (20) associated with said input unit (10) and responsive to said timer signal to close the gate for inhibiting input of said input code as long as said timer signal is present.
References Cited (Backward Citations)
No citation records indexed.
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