Engine speed control system for testing automobile exhaust

The utility model discloses an engine speed control system for testing automobile exhaust. The system comprises a controller, a speed sensor and an oil temperature sensor, wherein the controller is connected with an engine electronic control unit (ECU); the speed sensor is connected with the controller, and is used for acquiring an engine speed signal in real time; the oil temperature sensor is connected with the controller, and is used for acquiring an engine oil temperature signal in real time; and the controller comprises a signal processing module and a human-computer interface connected with the signal processing module. According to the system, the speed and oil temperature of an engine are acquired in real time, and the engine ECU is automatically controlled to keep the engine at high/low idle speed, so that a worker is not required to manually operate an accelerator pedal when testing components of the automobile exhaust; and compared with the conventional system adopting manual operation, the system