Seat belt minder will potentially becoming a requirement in future vehicles. The current seat belt minder used on front seats can be easily adopted for most cases. However for removable rear seats there are challenges for connector integrity during removal and re-attachment.
The requirement for the 3rd row seats in vans to have belt minder signal so the driver can be warned if seat belts are not buckled, especially with kids in the 3rd row seats.
However the 3rd row seats are also designed to be removable – either automatically sliding into the floor well or removed from the van to create additional cargo space.
Pogo Pin Connectors, Wireless Data & Power Transfer, Energy Harvesting Technology and Wireless Coin Cell Technology was investigated. For the belt minder hall affect sensor is common to all designs and is taken as a noise factor in the design.
Coin Cell Wireless RF Data Transfer was identified as the best fast to production and application solution. It is solution that meets program reliability, cost and timing targets.
Battery life assumption would be targeted at 10 years.
There are two potential solutions:
- Only with Transmitter: Use Energy saving chip (CBC348XX) to extend the battery life. (Power Savings Ratio shows battery extension of up to 11 times). Design uses MCU to detect the switchers and control the RF transmitter chip. System work in low power mode, only works when receive the Buckle or Occupied signal.
- With Transmitter and receiver: This solution has both receiver and transmitter module. MCU works when receive the Buckle or the occupied signal. Energy saving chip to extend the battery life.
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