摘要:
A fuel injection apparatus including a controller to output an injection time command signal and an opening movement time command signal to command an opening movement time from a closed state to an open state of an electromagnetic fuel injection valve and a control circuit, coupled to the controller, to change an electric current flowing in a coil of the electromagnetic fuel injection valve between when the electromagnetic fuel injection valve is closed and opened. The controller sends both the injection time command signal and the opening movement time command signal through the same signal line to the control circuit.
摘要:
An electromagnetic fuel injection valve in an engine injects fuel by opening/closing a fuel flowing path with a valve element. A controller controls opening/closing of the fuel flowing path and changes magnetic force generated by a control coil driving the valve element so that the magnetic force is less during a valve open state-holding period than at an initial valve-opening time. The controller detects the voltage of a battery and applies the voltage fed from the battery to the control coil, while changing a time interval (Tc), for which current is passed through the control coil, based on the detected voltage, in order to change the magnetic force, without raising the voltage from the battery. The controller also detects increase/decrease of a pressing force on the valve element caused by fuel pressure and changes the time interval (Tc) accordingly.
摘要:
In an electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flowing path, including a valve seat, a valve element for opening/closing the fuel flowing path formed between the valve seat and the valve element, and a drive unit having at least one coil, for driving the valve element. The drive unit includes a first magnetomotive force generating device using the at least one coil and a second magnetomotive force generating device, the first magnetomotive force generating device and the second magnetomotive force generating device being composed so that the first magnetomotive force generating device generates and raises magnetomotive force at a larger rate of change in time in comparison with the second magnetomotive force generating device. A valve opening hold state is held by the second magnetomotive force generating device which uses a smaller current flow in comparison with the first magnetomotive force generating device.
摘要:
An electromagnetic fuel injection valve for injecting fuel by opening/closing a fuel flow path, includes a valve seat, a valve element for opening/closing the fuel flow path formed between the valve seat and the valve element, and a drive unit having at least one coil for driving the valve element. The drive unit includes a first magnetomotive force generating device using the at least one coil and a second magnetomotive force generating device, the first magnetomotive force generating device and the second magnetomotive force generating device being composed so that the first magnetomotive force generating device generates and raises its magnetomotive force at a larger rate of change in time in comparison with the second magnetomotive force generating device. A valve open state is held by the second magnetomotive force generating device which uses a smaller current flow in comparison with the first magnetomotive force generating device.
摘要:
An electromagnetic fuel injector is provided with a first coil having a large rate of change in time of magnetomotive force and a second coil having a smaller rate of change in time of magnetomotive force than the first coil. During a valve opening operation at the time of opening the valve, current is passed through at least the first coil, and then current of a smaller current value than in the opening operation is caused to flow so as to hold the valve open, using the first and second coils.
摘要:
The target peak current value, where a current value is reduced in conformity to a drop in the voltage of a battery 18 is stored in target peak current storage unit 68. ON-signals are sent from current control circuit 56 to power transistor 50 in response to the injection command pulse coming from engine controller 58 so that current is applied to coil 20. Then, the current flowing to coil 20 is detected by the current detecting resistor 52. Comparator 62 compares this detected current and the target peak current value read from the target peak current storage unit 68 conforming to the voltage of battery 18. If agreement is found between these two values, OFF-signals are sent to power transistor 50 from current control circuit 56 in response to the switching command coming from comparator 62. Then, On/Off signals to effect holding of the coil 20 are sent from current control circuit 56 to power transistor 50. The linearity of the injection volume despite changes in battery voltage can be maintained.
摘要:
Using a control coil having a high response characteristic suited to the valve opening and a hold coil suited to a hold to be held a large force by a small large current, during the valve opening time a high voltage is applied to the control coil suited to the valve opening and during a valve opening hold time a low and stabilized voltage is applied to the hold coil suite to the holding, and then a valve body driven. In a fuel injection apparatus, a drive manner during a valve opening time and a hold time is optimized.
摘要:
Using a control coil having a high response characteristic suited to valve opening and a hold coil suited to a hold to valve open during fuel injection using a small current, during the valve opening time, a high voltage is applied to the control coil suited to the valve opening operation and, during the time the valve is to be held open a low and stabilized voltage is applied to the hold coil. In a fuel injection apparatus, drive manner employed during a valve opening time and a valve hold time is optimized.
摘要:
A fuel-injection valve includes a fuel-injection hole, a valve element and a valve seat for opening and closing the fuel-injection hole, a force-applying member for applying force to the valve element in a direction of motion of the valve element, and a drive unit for applying force to the valve element in the direction opposite to that of the force applied by the force-applying member; wherein a secondary oscillation system, which interacts with a primary oscillation system including the valve element and the force-applying member, is added to the primary oscillation system, and the phase angle of force applied to the primary oscillation system by the secondary oscillation system is also staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system, whereby the bouncing of the valve element during opening and closing of the valve is reduced, which in turn makes it possible to achieve very accurate fuel-injection control.
摘要:
A fuel-injection valve includes a fuel-injection hole, a valve element and a valve seat for opening and closing the fuel-injection hole, a force-applying member for applying force to the valve element in a direction of motion of the valve element, and a drive unit for applying force to the valve element in the direction opposite to that of the force applied by the force-applying member; wherein a secondary oscillation system, which interacts with a primary oscillation system including the valve element and the force-applying member, is added to the primary oscillation system, and the phase angle of force applied to the primary oscillation system by the secondary oscillation system is also staggered from that of force applied to the primary oscillation system, which is other than the force applied to the primary oscillation system by the secondary oscillation system, whereby the bouncing of the valve element during opening and closing of the valve is reduced, which in turn makes it possible to achieve very accurate fuel-injection control.