The smart wiper controller is a high-performance intelligent rain-sensing solution built around the design principles of automotive intelligence and comfort, combined with the latest optoelectronic signal processing technology. The controller uses an ELMOS rain sensor whose optoelectronic signal processing outperforms every comparable solution on the market today, greatly simplifying product development while delivering better value for money.
Key Points
- Rain detection: a complete algorithm accurately and reliably identifies the real-time rainfall state
- Ambient light detection: the solution supports up to 4 independent channels plus 1 multiplexed channel of ambient light detection
- Glass adaptation: an algorithmic approach for adapting to different windshield glass
- A reference mechanism for wiper action decision-making
Solution Overview
The smart wiper functional block diagram uses an automotive-grade MCU as the main controller, communicating with the E527.05 over SPI. The E527.05 is an infrared rain and ambient light sensor from ELMOS that integrates a LIN transceiver (V2.1, SAEJ2602, ISO9141), allowing it to communicate with the BCM over LIN.
Core Components
- MCU: NXP, GD and others; full part number available on request
- Sensor: E527.05 (ELMOS)
Applications
Passenger car front/rear wipers, bus front wipers
Reference Design E52705-Car demo
- Uses a 6-emitter, 1-receiver configuration to meet automotive rain detection requirements
- Uses 1 independent ambient light detection channel, which can be multiplexed when required
- Accurate, stable and fast identification of the real-time rainfall state
- Adjustable detection sensitivity, immune to interference from sunlight, dust, leaves and the like
- Supports a low-power sleep state, safeguarded by an internal watchdog
- Reserved CAN/LIN/UART interfaces for easy debugging and testing
Functional Block Diagram
