Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1996-10-07
1998-04-14
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
731181, 25112904, F02D 1110, G01B 730
Patent
active
057380724
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for actuating a control member, particularly a throttle valve in a gas conduit, such as for example an intake of an internal-combustion engine, which valve is pivotable into operating positions by means of a valve shaft, an actuator being provided, which actuator consists of a rotor body, serving as an actuator body and arranged on the valve shaft, and of an electrically energizable excitation section, which cooperates with said rotor body, and a position sensor detecting angular positions of the valve shaft, which sensor comprises an angular-position generator and an angular-position detector, which are associated with one another and of which one of the two is mounted so as to be rotatable.
2. Description of the Related Art
EP 0,375,050 B1 describes a device for actuating a control member, which can be controlled by an electrical controller. The control member is, for example, a throttle valve of the internal-combustion engine of a motor vehicle, which valve is mounted on a valve shaft. The valve shaft carries an actuator body in the form of a magnetized rotor body having two poles. The permanent-magnetic rotor body is cylindrical and cooperates with an excitation section having three pole shoes which surround the rotor body so as to form an air gap. The pole shoes carry windings by which they are energized and which are each powered and controlled separately.
The valve shaft carries a position sensor, which detects the angular positions of the throttle valve by means of an angular-position generator and an angular-position detector and which transfers electric signals marking the throttle-valve positions to the controller. The controller, in its turn, adjusts the desired valve position.
The separate mounting of the position sensor leads to a critical construction because the coupling imposes tight tolerances. The outgoing load-carrying shaft end with the position sensor coupled to it is unfavourable and is liable to cause problems under heavy operating conditions.
SUMMARY OF THE INVENTION
It is an object of the invention to make the use of the position sensor technically and constructionally simpler and more reliable.
According to the invention this object is ed in that the valve shaft itself is constructed to carry the angular-position generator or angular-position detector, and the associated part of the position sensor is stationarily mounted on the housing of the device.
Thus, a position sensor to be installed separately is no longer required and the shaft construction is simplified. Additional assembly and adjustment operations in connection with the mounting of a position sensor are not necessary either. Altogether, the construction is more economical and more reliable.
In a further embodiment of the invention means have been provided to guarantee that the associated parts of the position sensor operate within the required tolerance range under any operating conditions. The means which should guarantee that the associated parts of the position sensor operate within the required tolerance range under any operating conditions first of all include an accurate bearing arrangement of the shaft, so as to minimise radial and axial displacements of the shaft. The shaft should have an adequate resistance to bending.
In a further embodiment of the invention the rotatably mounted part of the position sensor is disposed on the valve shaft at the end which also carries the rotor body. Thus, the position sensor and the actuator, which consists of the excitation section and the rotor body, are disposed at the same side of the actuating device. This is constructionally advantageous and it reduces disturbing influences.
In a further embodiment of the invention the rotatably mounted part of the position sensor is a permanent-magnet body. This is constructionally simple.
In another embodiment of the invention the rotatably mounted part of the position sensor is the permanent-magnet rotor body itself. Thus, the separate magnet
REFERENCES:
patent: 4392375 (1983-07-01), Eguchi et al.
patent: 4601271 (1986-07-01), Ejiri et al.
patent: 4809742 (1989-03-01), Grau
patent: 5257014 (1993-10-01), Zimmermann
patent: 5513611 (1996-05-01), Ricouard
patent: 5544000 (1996-08-01), Suzuki et al.
Bertram Leo
Bolte Ekkehard
Wendt Matthias
McDermott Robert M.
U.S. Philips Corporation
Vo Hieu T.
Wolfe Willis R.
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