Anti-theft car protection system
First Claim
1. A method of operating an anti-theft car protection system for a motor vehicle powered by an engine, said system including a first control unit which controls the fuel injection to the engine and is capable of starting the engine responsive to an engine start instruction signal and of storing a first rolling code and a second control unit which is capable of storing a second rolling code, the method comprising the steps of:
- storing said first and said second rolling codes for said first and said second control units respectively;
issuing an "ON" signal when an ignition switch of the vehicle is turned from an "OFF" position to an "ON" position and issuing an "OFF" signal when the ignition switch is turned from the "ON" position to the "OFF" position;
providing said first control unit with said second rolling code responsive to the "ON" signal; and
comparing said first and said second rolling codes, and issuing an agreement signal if the first and the second rolling codes are in agreement and issuing a disagreement signal if the first and the second rolling codes are in disagreement;
feeding the engine start instruction signal to said first control unit responsive to said agreement signal, and preventing the feeding of the engine start instruction signal to said first control unit responsive to said disagreement signal;
setting a fail-safe flag responsive to issuance of said agreement signal;
clearing out said fail-safe flag responsive to said "OFF" signal; and
preventing suppression of the engine starting when said fail-safe flag is set.
1 Assignment
0 Petitions
Accused Products
Abstract
An anti-theft car protection system has a first control unit for controlling the fuel injection to an engine. The first control unit is capable of starting the engine upon receiving an engine start instruction signal and capable of storing a first rolling code. A second control unit is provided which is capable of storing a second rolling code. The system provides an interactive communication between the first and second control units when actuated and issues "ON" signal when an ignition key cylinder of an associated motor vehicle is turned from "OFF" position to "ON" position. The system, upon receiving the "ON" signal, feeds the first control unit with the engine start instruction signal and sends the second rolling code to the first control unit. The system then compares the first and second rolling codes and issues an agreement signal upon agreement of the first and second rolling signals and issues a disagreement signal upon disagreement of these signals. The system, upon receiving the agreement signal, permits continuation of the feeding of the engine start instruction signal to the first control unit, and which, upon receiving the disagreement signal, cancels the feeding of the engine start instruction signal to the first control unit.
16 Citations
38 Claims
-
1. A method of operating an anti-theft car protection system for a motor vehicle powered by an engine, said system including a first control unit which controls the fuel injection to the engine and is capable of starting the engine responsive to an engine start instruction signal and of storing a first rolling code and a second control unit which is capable of storing a second rolling code, the method comprising the steps of:
-
storing said first and said second rolling codes for said first and said second control units respectively; issuing an "ON" signal when an ignition switch of the vehicle is turned from an "OFF" position to an "ON" position and issuing an "OFF" signal when the ignition switch is turned from the "ON" position to the "OFF" position; providing said first control unit with said second rolling code responsive to the "ON" signal; and comparing said first and said second rolling codes, and issuing an agreement signal if the first and the second rolling codes are in agreement and issuing a disagreement signal if the first and the second rolling codes are in disagreement; feeding the engine start instruction signal to said first control unit responsive to said agreement signal, and preventing the feeding of the engine start instruction signal to said first control unit responsive to said disagreement signal; setting a fail-safe flag responsive to issuance of said agreement signal; clearing out said fail-safe flag responsive to said "OFF" signal; and preventing suppression of the engine starting when said fail-safe flag is set. - View Dependent Claims (2, 3)
-
-
4. A method of operating an anti-theft car protection system for a motor vehicle powered by an engine, said system including a first control unit which controls the fuel injection to the engine and is capable of starting the engine responsive to an engine start instruction signal and of storing a first rolling code and a second control unit which is capable of storing a second rolling code, the method comprising the steps of:
-
issuing an "ON" signal when an ignition key cylinder of the vehicle is turned from an "OFF" position to an "ON" position; issuing, to said first control unit, said engine start instruction signal and a new unit representing signal when one of said first and said second control units is new; and initializing said first and said second rolling codes responsive to said new unit representing signal.
-
-
5. A method for operating an anti-theft car protection system for a motor vehicle powered by an engine, the system including a first control unit capable of storing a first identification code and a second control unit capable of storing a second identification code, said second and said first control units being connected through an interactive communication line, the method comprising the steps of:
-
issuing an "ON" signal when an ignition switch of the vehicle is turned from an "OFF" position to an "ON" position for instructing starting of the engine and issuing an "OFF" signal when the ignition switch is turned from the "ON" position to the "OFF" position; responsive to said "ON" signal, comparing said first and said second identification codes, and issuing a disagreement signal if said first and said second identification codes disagree and an agreement signal if said first and said second identification codes agree; setting a fail-safe flag responsive to issuance of said agreement signal; clearing out said fail-safe flag responsive to said "OFF" signal; preventing suppression of the engine starting when said fail-safe flag is set; suppressing starting of the engine responsive to issuance of said disagreement signal only if said fail-safe flag is cleared; and changing said first and said second identification codes after starting of said engine. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. An anti-theft protection system for a motor vehicle powered by an engine comprising:
-
an ignition switch for issuing an "ON" signal responsive to being turned from an "OFF" to an "ON" position and for issuing an "OFF" signal responsive to being turned from the "ON" to the "OFF" position; an engine start inhibiting unit having a first rolling code stored therein for transmitting said first rolling code responsive the issuance of said "ON" signal and operative to transmit an engine start instruction signal; a central control unit, operative to control fuel injection to the vehicle engine and to set a fail-safe flag to prevent suppression of said fuel injection and to clear said fail-safe flag, having a second rolling code stored therein, for comparing said transmitted first rolling code with said second rolling code, and transmitting either a first comparison signal if said first rolling code agrees with said second rolling code or a second comparison signal if said first rolling code does not agree with said second rolling code; and a communications link connecting said engine start inhibiting unit and said central control unit for communicating said transmitted first rolling code from said engine start inhibiting unit to said central control unit, said transmitted comparison signal from said central control unit to said engine start inhibiting unit and said transmitted engine start instruction signal from said engine start inhibiting unit to said central control unit; wherein said engine start inhibiting unit is operated to transmit said engine start instruction signal only if the transmitted comparison signal is said first comparison signal and responsive thereto, and said central control unit is operated to allow fuel injection to the vehicle engine responsive to said transmitted engine start instruction signal and to set said fail-safe flag only if said transmitted comparison signal is the first comparison signal and to clear said fail-safe flag responsive only to issuance of said "OFF" signal. - View Dependent Claims (22, 23, 24, 25, 26)
-
-
27. A method of operating an anti-theft car protection system for a motor vehicle powered by an engine, comprising the steps of:
-
storing a first rolling code; storing a second rolling code; issuing an "ON" signal when an ignition switch of the vehicle is turned from an "OFF" position to an "ON" position and an "OFF" signal when the ignition switch is turned from the "ON" position to the "OFF" position; comparing said first rolling code to said second rolling code responsive to the "ON" signal; and issuing an agreement signal if the first and the second rolling codes are in agreement and issuing a disagreement signal if the first and the second rolling codes are in disagreement; setting a fail-safe flag responsive to issuance of said agreement signal; clearing out said fail-safe flag responsive to said "OFF" signal; and issuing an engine start instruction signal responsive to said agreement signal and preventing the issuance of the engine start instruction signal responsive to said disagreement signal; controlling the fuel injection to the engine such that fuel is injected to the engine responsive to the engine start instruction signal; and preventing suppression of fuel injection to the engine when said fail-safe flag is set. - View Dependent Claims (28, 29, 30)
-
-
31. A method of operating an anti-theft car protection system for a motor vehicle powered by an engine, comprising the steps of:
-
issuing an "ON" signal when an ignition switch of the vehicle is turned from an "OFF" position to an "ON" position; issuing a new code representing signal when one of a first rolling code and a second rolling code requires initializing; initializing said first and said second rolling codes responsive to said new code representing signal; storing said first rolling code; storing said second rolling code; issuing an engine start instruction signal if said stored first rolling code and said stored second rolling code are in agreement; and controlling the fuel injection to the engine to start the engine responsive to said engine start instruction signal.
-
-
32. A method of operating an anti-theft car protection system for a motor vehicle powered by an engine, comprising the steps of:
-
storing a first identification code; storing a second identification code; issuing an "ON" signal when an ignition switch of the vehicle is turned from an "OFF" position to an "ON" position for instructing starting of the engine and an "OFF" signal when the ignition switch is turned from the "ON" position to the "OFF" position; comparing said first and said second identification codes responsive to said "ON" signal; issuing a disagreement signal if said first and said second identification codes disagree and issuing an agreement signal if said first and said second identification codes agree; setting a fail-safe flag responsive to issuance of said agreement signal; clearing out said fail-safe flag responsive to said "OFF" signal; suppressing starting of the engine responsive to issuance of said disagreement signal only if said fail-safe flag is cleared and starting the engine responsive to issuance of said agreement signal; and changing said first and said second identification codes after starting of said engine. - View Dependent Claims (33, 34, 35, 36, 37, 38)
-
Specification