System Description

ENGINE HOOD / DOOR: LUGGAGE COMPARTMENT DOOR OPENER AND CLOSER SYSTEM: SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

1. LUGGAGE COMPARTMENT DOOR OPENER AND CLOSER SYSTEM DESCRIPTION
When the luggage compartment door opener inner switch ON signal is input to the main body ECU RH, the luggage compartment door activation signal is sent to the main body ECU RH through the multiplex communication line. A large amount of data are input to the main body ECU RH. Based on these data, the main body ECU RH judges if the luggage compartment door can be opened or not. When the ECU determines that the luggage compartment door can be opened, the main body ECU RH performs the following: 1) sends a luggage open request output signal, 2) activates the luggage compartment door closer motor, and 3) opens the luggage compartment door. The luggage compartment door closer includes the position detection switch, the courtesy switch and the open detection switch (on the striker side). These switches send signals to the main body ECU RH. Based on these signals, the main body ECU RH controls the luggage compartment door closer.
2. FUNCTION OF MAIN COMPONENTS
The luggage compartment door opener and closer system mainly consists of a luggage compartment door closer and the main body ECU LH. The luggage compartment door closer contains switches and a motor. The system has the functions listed below.






3. GENERAL

- A signal actuator performs both the opener and closer functions. It is located in the luggage compartment door closer. The closer function automatically closes the luggage compartment door entirely even if only a light pressure is applied to close the luggage compartment door.
- A jam protection function is used so that if the presence of a foreign object is detected between the luggage compartment door and the vehicle body while the system is in closer mode, the system changes to opener mode.
- While this system is in closer mode, if the trunk switch of the transmitter or the luggage compartment door opener inner switch is pressed, or if the luggage compartment door opener outer switch is pushed, the system cancels its operation and opens the luggage compartment door. This system is controlled by the main body ECU LH. In accordance with the signals received from the switches, the ECU controls the opener or closer function by actuating the closer motor to push and turn the latch. The multiplex network rear ECU transmits its signals via the Body Electronics Area Network (BEAN) and belongs to the steering column bus.

4. CONSTRUCTION AND OPERATION
(a) Luggage Compartment Door Closer:
- The luggage compartment door closer is mounted on the luggage compartment door and consists mainly of a link mechanism and a closer motor. It provides 2 functions: the closer function to automatically close the luggage compartment door, and the opener function to disengage the striker from the closer latch.
- The luggage compartment door closer contains 1 light switch and 2 position detection switches (open and closer) in the closer motor.





(b) Luggage Compartment Door Striker:
- The luggage compartment door striker is mounted on the vehicle body. The engagement of the portion of the striker with the latch of the luggage compartment door closer causes the luggage compartment door to lock.
- The luggage compartment door closer is used for detecting whether the luggage compartment door is open or closed.





(c) Main Body ECU LH:
(1) General

- When this system is in opener mode, it actuates the closer motor in order to free the latch by disengaging the latch from the link mechanism under one of the following conditions: 1) an open request signal from the wireless door lock remote control system or luggage compartment door opener inner switch is received by the ECU; or 2) a change in the courtesy switch signals from OFF to ON, which is caused by the operation of the luggage compartment door opener outer switch, is received by the ECU. At this time, because the hinges of the luggage compartment door apply tension to the door in the open direction, the pole portion of the striker disengages from the latch.
- In closer mode, this system operates as follows: when the state of the luggage compartment door changes from open to ajar, the signal from the courtesy light switch changes from ON to OFF. Upon receiving this signal, the ECU actuates the motor in order to push and turn the latch via the link mechanism. As a result, the latch engages with the pole portion of the striker in order to fully close the luggage compartment door.
- A jam protection function is used so that if the position detection switches cannot detect a close completion position after the system has started its closer function, the system determines that an abnormal condition has occurred (such as the detection of a jammed object) in the closer function. Then, the system stops the operation of the closer function and changes to the opener function.
(2) Operation

- In the luggage compartment door opener and closer system, after the motor rotates the gears approximately 180° from its initial position (open completion position) to change the state of the luggage compartment door from ajar to fully closed, the motor stops. Then, the motor rotates the gears from the close completion position (open starting position) to the release position in order to free the latch (by disengaging the latch) from the link mechanism. After disengaging the pole portion of the striker from the latch, the motor stops in this position. In this manner, the motor stops before reaching the initial position (open completion position) for the time being. Because the switches are not in their initial state, the system is prevented from executing the closer function, such as when prompted by the sluggishness of the luggage compartment door. Thereafter, when the system detects that the state of the door unlock switch has changed from OFF to ON (because the door has opened), it actuates the motor to rotate the gears to the initial position (open completion position) and stops the motor. The switches will then return to their initial state.
- In the jam protection function, if the system detects a jammed object, it reverses the motor just before it reaches the full lock position and actuates the motor until the close completion position (open starting position) has been reached. At this time, the latch becomes free by disengaging from the link mechanism. As a result, the pole portion of the striker disengages from the latch. Then the system actuates the motor in the forward direction to return to its initial position (open completion position).
- While the system is operating in the closer mode, if a signal that indicates that the luggage compartment door has been opened (such as by the trunk switch, luggage compartment door opener inner switch, luggage compartment door opener outer switch, or the courtesy switch through the operation of the luggage compartment door key cylinder), the system stops the closer function. Then it reverses the motor, just as in the jam protection function. In this manner, the system cancels its operation and opens the luggage compartment door regardless of its condition.





- The timing chart below shows the basic operation of the luggage compartment door opener and closer system.




(3) Fail-safe
If a system malfunction is detected by the main body ECU LH, the ECU stops the system. However, even if the system is deactivated, the luggage compartment door can be opened and closed manually.
5. STANDARD LUGGAGE COMPARTMENT DOOR OPERATION
(a) During standard luggage compartment door operation, the closer motor rotates counterclockwise and changes between positions in the following order: 1) open completion position, 2) close completion position, and 3) open standby position. The closer motor then returns to the open completion position. When luggage compartment door operation is abnormal, the closer motor rotates clockwise.
(b) The position detection switches and the closer motor positions are described in the table below.






(c) Closer Operation
(1) Normal Motor Operation
When the closer motor is at the open completion position (position detection switches: LOPN ON, LCLS OFF) and the door unlock switch (BDCY) is OFF, if the luggage door courtesy switch (LCTY) is turned from ON to OFF, the closer motor rotates counterclockwise and stops at the close completion position (position detection switches: LOPN OFF, LCLS OFF).
(2) Motor Operation Under Abnormal Condition (Jammed object is present)
If the close completion position (position detection switches: LOPN OFF, LCLS OFF) cannot be detected within 3 seconds after closer operation was activated, an error occurs and a jammed object is assumed to be present. As a result, the closer operation is canceled and, once motor stoppage of 100 +-20 milliseconds is confirmed, the closer motor rotates clockwise to the open completion position (position detection switches: LOPN ON, LCLS OFF).
(3) Opener Operation Demand During Closer Operation
If any of the following conditions are met during the closer operation, the opener operation is conducted.

- The transmitter's trunk switch or the luggage compartment door opener inner switch has been pressed.
- The main body ECU LH receives a luggage door OPEN signal from the main body ECU RH.
- The luggage door courtesy switch (LCTY) is ON.
HINT: The luggage door key cylinder and the luggage door courtesy switch (LTCY) are mechanically connected. When the key cylinder switch signal indicates that the luggage compartment door has been opened, the luggage door courtesy switch is turned ON.

(d) Opener Operation
(1) Normal Motor Operation
When the closer motor is at the close completion position (position detection switches: LOPN OFF, LCLS OFF), if a luggage compartment door OPEN signal is received, the closer motor rotates counterclockwise and the opener operation is conducted. The motor will stop at the open standby position (position detection switches: LOPN OFF, LCLS ON). If the luggage door lock switch signal changes from OFF to ON (luggage compartment door has opened), the closer motor rotates counterclockwise, stopping at the open completion position (position detection switches: LOPN ON, LCLS OFF).
(2) Motor Operation Under Abnormal Condition
Even though the closer motor is not at the close completion position (position detection switches: LOPN OFF, LCLS OFF), the luggage door courtesy switch (LCTY) sends an ON signal (through operation of the luggage door key cylinder) or a luggage door OPEN signal is received. This is determined as an error and the closer motor rotates clockwise to the open completion position (position detection switches: LOPN ON, LCLS OFF).