IMS Tilt & Telescope Control

Description

Driver may choose and store the best steering column position at the tilt & telescope unit using the memory switch and the position sensor, in order to restore the steering column position at once.
There are CAN communication for data transmission and reception between the memory power seat unit and the driver side door module. The operation is inhibited for safety during driving.

Feature
1. Manual operation of the tilt & telescope by the manual switch. (Manual operation)
2. Memory and regeneration operation of the tilt & telescope by memory switch. (Memory and replay operation): for 2 persons.
3. Auto memory upon the keyless LOCK and regeneration upon the UNLOCK. (Keyless memory and regeneration operation): for 2 persons.

Operation

Manual Operation
1. Motor operation by the manual switch (Tilt & telescope steering column tilt up & down, telescope forward & backward)
2. Manual switch operation auto stop by limit switch OFF.

Memory Registration
1. Data related to the registration are received through the CAN communication from DDM.
2. If any of the following conditions is met, memory permit status is released.
When the ignition is OFF.
When the manual switch is ON.
3. If 2 position switches are pressed ON simultaneously (within time interval of 50 ms) in memory registration, none of the switches are valid, and the first pressed switch is valid if the time interval is greater than 50 ms.
4. If the vehicle speed is over the limit speed of 3km/h or shift lever is at the position other than P, registration cannot be performed.
5. Registration can be revised without any limitation.
6. Memory will be cleared if the battery is removed.
7. If the memory registration is permitted (memory switch is ON), it sounds the buzzer.

Memory Replay Operation
1. Data related to the memory replay are received through the CAN communication from DDM.
2. Memory replay will not be performed unless it is registered.
3. If the position switch is pressed while the memory replay is in operation, the final switch is effective. Though, if the switches are pressed within the time interval of 50 ms, replay will not be performed.
4. When the replay is in operation (position switch is ON), buzzer will sounds once.
5. If any of the following conditions is met, replay is prohibited and operation will stop if it is in replay.
When the ignition is OFF.
When the "P" position switch is OFF (when the shift lever is at the position other than "P")
When the vehicle speed is over 3 km/h (when it last more than 2 or 3 seconds)
When the manual switch in relation to the tilt & telescope is in operation. (Tilt & telescope related replay operation stops)
When the stop switch is ON.




6. Determining operational priority
In order to prevent overlapping of rushing current when the motor starts up, motor start-up is delayed for 100 ± 10 ms respectively and its operational priority is as follows.
Tilt>Telescope

Buzzer Output
1. In case of memory permit status (memory switch is ON) : once
2. When memory registration is complete (position switch is ON) : twice
3. When the memory replay is in operation (position switch is ON) : once
4. When error is detected due to the sensor failure : 10 times

Error Detection
1. If the sensor fluctuations of tilt & telescope for one second after motor start-up are less than 4 pulses respectively ( Limit switch ON/CLOSE), the harness is short or sensor is fail.
2. Countermeasure when error is detected.
Stop the operation if it is in auto replay. Though, it should be operable manually. When the failure is completely repaired, it can be automatically adjusted from the stop of auto replay. If the position sensor senses the pulse from the position sensor by the manual operation (in case of sensor fluctuation for 1 seconds is greater than 4 pulses), we judge it is complete. This is called stop release of automatic operation.