Engine Immobiliser System (w/ Smart Key System)

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): SYSTEM DIAGRAM

SYSTEM DIAGRAM






SYSTEM DESCRIPTION

1. ENGINE IMMOBILISER SYSTEM DESCRIPTION
(a) The immobiliser system is a theft deterrent system that determines whether or not to disable starting of the hybrid control system depending on a comparison of the key's ID code and the vehicle's pre-registered code.
The immobiliser system compares the vehicle transponder key ECU's pre-registered ID code with the key-embedded transponder chip's ID code. If the ID codes do not match, the immobiliser system activates and the hybrid control system cannot be started. The transponder key ECU manages communication with the hybrid vehicle control ECU and power source control ECU. When the ID codes of the transponder chip and transponder key ECU match, the transponder key ECU authorizes the starting of the hybrid control system.
2. FUNCTION OF MAIN COMPONENTS






3. SYSTEM FUNCTION
(a) Starting hybrid control system with key inserted into the key slot:
When the transponder key ECU detects that the halfway switch is ON, the ECU provides current to the transponder key coil and produces a faint electric wave. A transponder chip in the key receives the faint electric wave. Upon receiving the faint electric wave, the transponder chip outputs a key ID code signal. The transponder key coil receives this signal, the transponder key amplifier amplifies it, and then the signal is transmitted to the transponder key ECU. The transponder key ECU matches the key's ID code with the vehicle's ID code, which was previously registered in the ECU. If the ID codes match, the transponder key ECU turns off the security indicator. Then when the power switch is pushed, the code match results are sent through the transponder key ECU to the power source control ECU, which authorizes the transition of the power switch's power modes. The ACC, IG1 and IG2 relays are turned ON, supplying power to the power switch ON (ACC) and ON (IG) power modes. Also, the power source control ECU changes the power switch's indicator to amber, informing the driver that the power mode is set to ON (IG). Then, the power source control ECU sends a system start signal to the hybrid vehicle control ECU. The hybrid vehicle control ECU confirms that the key ID code has been verified. If the ID code has been verified, the hybrid vehicle control ECU bypasses the immobiliser system and starts the hybrid control system.
(b) Starting hybrid control system without inserting the key into key slot:
If a user operates the power switch while the key is in the user's possession, the certification ECU outputs a request signal to the room oscillator. The room oscillator emits signals in order to form a key detection area in the vehicle interior. The key then sends its ID code signal to the certification ECU via the door control receiver. The certification ECU matches the key's ID code with the vehicle's ID code, which was previously registered in the transponder key ECU. If the ID codes match, the transponder key ECU turns off the security indicator. Then when the power switch is pushed, the code match results are sent through the transponder key ECU to the power source control ECU, which authorizes the transition of the power switch's power modes. The ACC, IG1 and IG2 relays are turned ON, supplying power to the power switch ON (ACC) and ON (IG) power modes. Also, the power source control ECU changes the power switch's indicator to amber, informing the driver that the power mode is set to ON (IG). Then, the power source control ECU sends a system start signal to the hybrid vehicle control ECU. The hybrid vehicle control ECU confirms that the key ID code has been verified. If the ID code has been verified, the hybrid vehicle control ECU bypasses the immobiliser system and starts the hybrid control system.