Engine Control Module (ECM)

Courtesy of VOLVO CARS CORPORATION

Supplier is Denso. The control modules for the diesel engine and the petrol engines are identical in terms of:

• External geometry
  • The time critical signals regarding shift quality, torque limitation and drive mode, amongst other things, are sent via PT CAN.
  • Shift requests and transmission temperature, amongst other things, are sent via HS CAN.
• Connector
  • The time critical signals regarding shift quality, torque limitation and drive mode, amongst other things, are sent via PT CAN.
  • Shift requests and transmission temperature, amongst other things, are sent via HS CAN.
• Circuit board
  • The time critical signals regarding shift quality, torque limitation and drive mode, amongst other things, are sent via PT CAN.
  • Shift requests and transmission temperature, amongst other things, are sent via HS CAN.
• The communication with the transmission control module (TCM) takes place via PT (Power Train) CAN at a speed of 500 kBs and via HS CAN.
  • The time critical signals regarding shift quality, torque limitation and drive mode, amongst other things, are sent via PT CAN.
  • Shift requests and transmission temperature, amongst other things, are sent via HS CAN.
• the software that controls when the automatic transmission normal shifts should occur based on accelerator pedal position, drive mode, operating conditions etc. and when the lock-up function must be activated.
• integrated sensor that registers the air pressure.
• integrated temperature sensor.
• handling the refined wheel spin control at Launch Mode.

Example of components and functions with similar function principles are:

• DC/DC-converter that increases the battery voltage from approx. 12 V to approx. 40-50 V. A condenser stores the voltage required to control components that require voltage greater than 12 V. • Two High-side drivers that supply voltage to two injectors each.
• four low-side drivers that each close the circuit for an injector.
• H-bridges that are used to control current in two directions, i.e. change the polarity in a component. Used, amongst other things, to control electric motors such as the ETA (Electronic Throttle Actuator).

Data capacity

• CPU (Central Processing Unit) 200MHz, 32 bit
• RAM (Random Access Memory) 256kB
• EEPROM (Electrically Erasable Programmable Read-Only Memory) flash memory 128 kB