Communication Sensor-ECU

Each connected sensor is able to send one or more signals to the ECU in a defined timeslot.

The communication from sensor to the control unit ECU is realized by current modulation.

Thereby a "logical 1" is represented by a falling edge and a "logical 0" is represented as a rising edge.

For data transmission the manchester code is used.

The sensor data are sent periodically to the ECU.

Between two data packages a time gap occurs, which has to be longer than the bit transmission time.

Each data package includes n data bits, consist of:

• 2 start bits

• Number of data bit between k=10-28 bits

• 1 parity or 3 CRC bits

Framing of the data package:

The data package is divided in the following data sections:

• Data section A
  Signal data of the sensors with 10 to 24 bits length
  Mandatory data section, which have to exist.
  Described of A0 ... A[n-1], at which n can varied between 10 to 24.
  

• Data section B
  Further signal data of the senors with 10 to 24 bits length.
  Optional data section
  Described of B0 ... B[m-1], at which m can varied between 1 to 12.
  

• Sensor Satus
  Section of the status information with 1 or 2 bits length.
  Optional data section
  Described of E0 ... E[r-1], at which m can varied between 1 to 2.
  

• Frame control
  Frame control information of the sensors with 1 to 4 bit-length.
  Optional data section
  Described of F0 ... F[q-1], at which q can varied between 1 to 4.
  

• Serieller Message Channel
  Optional message section for additional serial data transmission.
  Described of M0 and M1 with 2 bit.

The length of a data package results from:

by parity error detection:

n=k+3 (minimal 13 and maximal 31 bits)

by CRC error detection:

n=k+5  (minimal 15 and maximal 33 bits).

Detailed description of Simulyzer settings.