Fuel injection valve with cylinder internal pressure sensor
View Patent ↗In the interior of a resin mold portion that constitutes a fuel injection valve, an amplifying member to which a power source terminal and a signal terminal are connected, is provided. A signal transmitting unit, which outputs a detection signal from a sensor, is connected electrically to a substrate of the amplifying member. Further, the amplifying member is molded integrally when the resin mold portion is formed. In addition, a pressure inside a combustion chamber of an internal combustion engine, which is detected by the sensor, is output through the signal transmitting unit to the amplifying member, is amplified by the amplifying member, and is output externally from the signal terminal.
1. A fuel injection valve equipped with a cylinder internal pressure sensor, the fuel injection valve being configured to directly inject fuel into a combustion chamber of an internal combustion engine, the sensor being provided at an end of the fuel injection valve, the sensor being configured to detect a cylinder internal pressure in an interior of the combustion chamber, the fuel injection valve comprising:
a solenoid unit;
a resin sealing portion molding a portion of the solenoid unit;
a signal transmitting unit disposed in an interior of the fuel injection valve and configured to transmit a detection signal based on the cylinder internal pressure;
wherein the solenoid unit includes a coil and a pair of drive terminals connected to the coil,
wherein the signal transmitting unit comprises:
a first transmitting member connected to the sensor;
a second transmitting member connected to the first transmitting member and configured to externally output the detection signal; and
an amplifying unit disposed on the first transmitting member and configured to amplify the detection signal,
wherein the amplifying unit is constituted as a circuit body in which a substrate is molded by a resin material,
wherein the circuit body is connected to the second transmitting member and a power source terminal configured to supply electric current, and
the circuit body and the drive terminals are incorporated in the resin sealing portion.
2. The fuel injection valve equipped with the cylinder internal pressure sensor according to claim 1 , further comprising:
a housing having a fixed core, and a holder, the holder being disposed on an outer circumferential side of the fixed core and constituting a magnetic path;
wherein grooves are formed respectively in the fixed core and the holder, the grooves being configured to be engaged with the resin sealing portion, and the circuit body is disposed between one of the grooves and another of the grooves.