Patent application number | Description | Published |
20090078898 | VALVE OPENING AND CLOSING CONTROL APPARATUS - When a control unit variably controls an electric power supplied to an electric motor to repeat a valve opening and closing movement of a valve between a first intermediate position and a second intermediate position through a neutral position, the control unit initially sets the neutral position as a control target value until a valve position, which is sensed with a valve opening degree sensor, is located immediately before the neutral position. The control unit thereafter changes the control target value to the first intermediate position or the second intermediate position when the control unit determines that the valve position, which is sensed with the valve opening degree sensor, reaches the neutral position. | 03-26-2009 |
20090235654 | EXHAUST GAS SWITCHING VALVE - A partition wall partitioning a cooler inlet port and a cooler outlet port extends from a cooler connecting surface of a connecting portion to a vicinity of a shaft supporting a four-way butterfly valve. An EGR gas leakage around a first valve plate can be restricted. Thus, an increase in temperature of EGR gas flowing through an EGR gas outlet port can be restricted at a cooled mode. A deterioration of emission reducing performance can be avoided. | 09-24-2009 |
20100089370 | EXHAUST GAS RECIRCULATION SYSTEM - An actuator includes an electric motor and a drive force transmitting mechanism. The drive force transmitting mechanism includes a rotary gear and a rotary cam. The rotary gear transmits a drive force of the electric motor to an EGR valve to drive the same. The rotary cam transmits the drive force of the electric motor to a mode change valve to drive the same. The rotary cam is releasably linkable to the rotary gear to receive the drive force of the electric motor through the rotary gear. | 04-15-2010 |
20100199957 | HIGH-PRESSURE EGR APPARATUS - An EGR control valve is driven by an actuator so as to control EGR amount by changing its opening degree. An EGR cooling device is provided in an EGR passage for cooling down EGR gas. A bypass passage is provided to the EGR passage, so that EGR gas may bypass the EGR cooling device. A switching valve is provided in the EGR passage for switching EGR mode from a hot EGR mode in which the EGR gas flows through the bypass passage to a cold EGR mode in which the EGR gas flows through the EGR cooling device, or vice versa. A converting mechanism is provided between the EGR control valve and the switching valve, so that the switching valve is driven by the actuator from its hot to cold switching position (or vice versa) when the EGR control valve is driven by the same actuator in a small angular range. | 08-12-2010 |
20100206274 | LOW PRESSURE EGR APPARATUS - A converting mechanism is provided between an EGR control valve driven by an actuator and an intake-air valve for generating negative pressure, so that the intake-air valve is also driven by the actuator. The converting mechanism has a cam plate rotated together with the EGR control valve and an arm rotated together with the intake-air valve. A cam groove formed in the cam plate is engaged with a driving pin of the arm. The intake-air valve is held at its maximum valve opening position, when the EGR control valve is rotated in a first angular range, while the intake-air valve is rotated from the valve opening position to a maximum valve closing position when the EGR control valve is rotated in a second angular range. | 08-19-2010 |
20100237269 | VALVE DEVICE - An object of the invention for a valve device having an inclined valve body is to suppress pressure loss at a valve opened condition to a smaller amount. The valve body is composed of a disc shaped valve member for closing a fluid passage, a first supporting portion provided at an outer periphery of the valve member and connected to a first shaft member, and a second supporting portion provided at another outer periphery of the valve member and connected to a second shaft member. The valve body is formed of a press-molded metal plate and forms a Z-shape when viewed in a direction parallel to a surface of the valve member. | 09-23-2010 |
20110023846 | LOW PRESSURE EXHAUST GAS RECIRCULATION APPARATUS - A low pressure EGR regulating valve is driven by an electric actuator, and an output of the electric actuator is transmitted to an intake air throttle valve through a link device. An ECU executes a failure determination to determine presence of a failure in a case where a sensed opening degree, which is sensed with a low pressure EGR opening degree sensor, is other than an opening degree that corresponds to a maximum opening degree of the throttle valve limited by a mechanical stopper. The ECU executes the failure determination after the energization of the electric actuator is stopped in response to stopping of the engine. | 02-03-2011 |
20110042599 | FLUID CONTROL VALVE - A fluid control valve includes a housing having a seat ring and a plate spring, a butterfly valve, and a valve shaft. The valve shaft has a plane-surface portion and a cam portion, which are arranged adjacent to each other. The fluid control valve is configured such that when an opening degree of the butterfly valve is a first valve opening degree or more, the cam portion is brought into sliding contact with the seat ring and the seat ring is pushed to a location radially outward of a moving path of the butterfly valve against elastic force of the plate spring. Thus, occurrence of uneven wear on a seat surface of the seat ring can be suppressed. | 02-24-2011 |
20130140477 | ELECTRIC ACTUATOR AND CONTROL VALVE INCLUDING THE ELECTRIC ACTUATOR - An electric actuator includes a direct current (DC) motor, a deceleration mechanism having an input gear, an intermediate gear, an output gear, and an output shaft, and a return mechanism. The return mechanism includes a first resilient member and a second resilient member. The first resilient member is configured to apply resilient force, which urges a movable body in a direction to return the movable body from its displacement position to initial position, to the output shaft or the output gear. The second resilient member is configured to apply resilient force, which urges the movable body in the direction to return the movable body from its displacement position to initial position, to a motor shaft, the input gear, or the intermediate gear. | 06-06-2013 |
20140116526 | VALVE DEVICE AND MANUFACTURING METHOD FOR THE SAME - A control unit generates a control signal for controlling an actuator to manipulate a valve element and to control a quantity of flow in a passage according to both an opening position of the valve element and a predetermined correlation between the opening position and the quantity of flow. The control unit includes a storage unit storing an error-characteristic function and a compensation unit to compensate the control signal according to the error-characteristic function. An actual correlation between the opening position and the quantity of flow is actually measured separately from the predetermined correlation. The error-characteristic function is an approximation of a relation between an opening position x in the predetermined correlation and an opening position y in the actual correlation at a same quantity of flow, which are calculated beforehand with reference to the actual correlation and the predetermined correlation. | 05-01-2014 |
20140283798 | EXHAUST GAS RECIRCULATION DEVICE - An EGR passage recirculates a part of exhaust gas from an exhaust passage to an intake passage. An EGR valve opens and closes the EGR passage. An exhaust cooling passage includes an EGR cooler closer to the exhaust passage than the EGR valve. A bypass passage branches at an upstream of the exhaust cooling passage to bypass the EGR cooler and to extend toward a downstream of the exhaust cooling passage. In a bypass open mode, a bypass switching valve opens both the exhaust cooling passage and the bypass passage. In a bypass close mode, the bypass switching valve opens the exhaust cooling passage and closes the bypass passage. In a cooler close mode, the bypass switching valve closes the exhaust cooling passage and opens the bypass passage. The bypass switching valve is set at the bypass open mode when the EGR valve is closed. | 09-25-2014 |