Security detection system and method for gas supply system of dual-fuel automobile

The invention discloses a security detection system for a gas supply system of a dual-fuel automobile. The security detection system comprises a gas supply system state sensor, a diagnosis module, a leakage detection module and an alarm module. The signal output end of the gas supply system state sensor is connected with the signal input end of the diagnosis module. The gas supply system state sensor sends state data of a gas cylinder and a gas track of the gas supply system to the diagnosis module. The diagnosis module judges the state data of the gas supply system preliminarily. The data output end of the diagnosis module is connected with the data input end of the leakage detection module. The leakage detection module analyzes and judges the data judged by the diagnosis module preliminarily. The leakage detection module is also connected with an automobile rotational speed sensor and a power-on switch. Information of the automobile rotational speed sensor and the power-on switch is transmitted to the leakage detection module. The signal output end of the leakage detection module is connected with the alarm module. The alarm module gives an alarm.