TCU - Transmission Control Unit


Ecotron Transmission Control Unit (TCU) is the controller for 2-speed, 3-speed, or 4-speed transmission for electric vehicles. This kind of transmissions work with the electric motor and maximize the efficiency of the motors. The transmission control unit can read the motor speed, the vehicle speed, and other inputs, decides the best gear ratio for the operation conditions, therefore can optimize the overall motor efficiency and increase the performance of the electric vehicles. One version of our TCUs can control the automatic transmission. We have some unique control strategies to realize the fast gear shifting and compensate the power interrupt during the shifting. Our TCU can be combined with the vehicle control unit and make a 2-in-1 controller to simplify the system, and reduce cost. Similar to our VCUs, our TCUs come with the complete tool chain for model based design and auto code generation.


  • Ecotron TCU is designed with ISO26262 functional safety in mind, and comes with a main chip and a monitor chip built-in, for safety monitoring.
  • Ecotron TCU comes with the basic software, or BSW, supports all typical input / output drivers for vehicle controls. The BSW is encapsulated in the MATLAB/Simulink environment, and the user can develop the control system with 100% model-based-design methods.
  • The TCU hardware is abstracted from the application software and relieves the controls engineer from the challenge of the microprocessor configuration and embedded real-time software.
  • Ecotron TCU comes with a CAN bus based reprogramming tool, supported by our boot loader which is pre-programmed into the microprocessor.
  • Ecotron TCU supports the CCP/XCP based calibration tools, like INCA, CANape, as well as the cost effective EcoCAL, developed by Ecotron.

Functions ET22377A
Main chip 32-bit SAK-TC377TP-96F300S AA: 300MHz, Flash 6MB, SRAM 1.1M, Floating Point Capability
Monitor chip /
Supply voltage DC 12V/24V (9-32V)
Peak voltage DC 36V
Reprogramming Bootloader, CCP Protocols
CAN Bus 3 channels, CANA supports any frame wake up
LIN Bus /
Sensor supply output 4 Channels, 5V
Analog Input 8 Channels
Digital Input 8 channels
Frequency signal input 4 channels
Low-side driver /
High-side driver 2 channels @ Max current 10A,
4 channels @ Max current 2A,
2 could be configured as PWM outputs
Peak and Hold /
H bridge 2 channels @ Max current 20A
Operating temperature -40℃ ~ +85℃
Storage Temperature -40℃ ~ +85℃
Working humidity Satisfying 0 ~ 95%, noncondensing
Protection category IP67
Pin number 121 Pin
Dimensions 207x148x41mm
Housing Material Die-casting Aluminum
Weight ≤1500g
Mechanical characteristics Vibration, shock, drop test done as in ISO16750