The invention discloses an electronic control device for
engineering machinery and a working method. A controller is connected with a
parking brake switch, a
handle meso-position switch, an accelerator idle switch, a starting switch, a starting
relay contact, an engine ECU (
electronic control unit) and a
flameout switch. The engine ECU is connected with an engine and a starting
relay coil, one endof the starting
relay contact is connected with the controller, the other end of the starting relay contact is connected with a
starter, and the controller is further connected with a
brake valve. The emergency
flameout switch and a power forced
recovery switch are further connected between the controller and the engine ECU, and an
emergency brake switch is further arranged to control a power supply of the whole electronic control device. Damage to the engine and a
pressurizer caused by improper operation in the starting and
flameout process of the engine can be avoided, damage to the starterand a storage battery caused by improper operation in the starting process is avoided,
emergency brake of the whole machinery can be realized, emergency flameout of the engine can be realized, poweris recovered in a forced manner under perilous working conditions, and safety and reliability of the whole machinery are greatly improved.