System for failure safety control between controllers of hybrid vehicle

A system for failure safety control between controllers connected to an Hybrid vehicle Control Unit (HCU) via Controller Area Network (CAN) communication, comprising:

• an Engine Control Unit (ECU) connected to the HCU via CAN communication, and configured to output a ready signal to the HCU and control operation of an engine;
• an Motor Control Unit (MCU) connected to the HCU via CAN communication, and configured to output a ready signal to the HCU and control operation of a motor;
• a Transmission Control Unit (TCU) connected to the HCU, and configured to output a ready signal to the HCU and control operation of a transmission;
• a Battery Management System (BMS) connected to the HCU via CAN communication, and configured to output a ready signal to the HCU and manage a state of a battery;
• and
• the HCU configured to output ready signals to the ECU, the MCU, the TCU and the BMS to control operation of the controllers, control a hybrid operation mode, and have CAN communication line signal detection terminals for detecting states of CAN communication connections to the controllers and ready signal detection terminals for detecting ready signals input from the respective controllers,
• wherein, when CAN communication between the HCU and the MCU is impossible, the HCU performs motor use prohibition, replaces a motor RPM signal with an engine RPM signal applied from the ECU, and performs alarm light control, and
• wherein, when CAN communication between the HCU and the BMS is impossible, the HCU performs motor torque limitation and alarm light control.