Fuel injection valve for internal-combustion engine, has control valve to control fuel pressure and transfer control valve-thrust force on piezoelement that works as force sensor and operating condition detection sensor

摘要

The valve (1) has a control valve (4) to control fuel pressure in a control area (21), where the fuel pressure produces a valve needle-thrust force on a control surface (22) of a valve needle (5), in the control area. The control area is connected with a control valve area (16) by a throttle-free connection channel (20), to allow the valve needle-thrust force to correspond to a control valve-thrust force in a delay-free manner. The control valve transfers the latter force to a piezoelement (29) that works as a force sensor and an operating condition detection sensor.