Disclosed is a throttle device for an internal-combustion engine, in which, on one side of the side wall of a throttle body, there are formed a space for mounting a reduction gear mechanism which transmits the power from a motor to a throttle valve shaft and a default opening setting mechanism for holding a throttle valve opening at a specific opening (default opening) when the ignition switch is in off position, and a gear cover mounting frame which edges the mounting space. The frame is formed lower than the mounting level of the reduction gear mechanism. A gear cover for covering the gear mounting space is attached on the frame. A stopper for defining the default opening and a stopper for defining the full-closed position of the throttle valve are juxtaposed so as to enable position adjustments in the same direction. These stoppers serve to stop a default lever and a throttle gear, thereby enabling downsizing, weight reduction, and rationalization of fabrication and adjustments of an electronically controlled throttle device.

Throttle device for internal-combustion engine

An engine control device can include a throttle valve for adjusting an amount of air supplied to an engine, operation amount detecting sensors for detecting an operation amount of a throttle lever, a motor for driving the throttle valve between open and closed positions according to detection values of the operation amount detecting sensor 21 a or the like, and throttle opening detecting sensors for detecting an opening of the throttle valve is provided with a limp-home mechanism for keeping the throttle valve in a mechanically neutral position when an abnormality occurs When the throttle valve is in the mechanically neutral position, an ignition timing control can be switched in a stepwise manner over a predetermined time period from a regular ignition timing control to a limp-home ignition timing control

Engine control device

A fail-safe throttle positioning device is disclosed for an engine induction system. A throttle body is provided having a fluid passage. A movable throttle valve is disposed within the fluid passage for at least idle speed control. An actuator mechanism is connected to the throttle valve for operably moving the throttle valve between a minimum fluid flow position and a maximum fluid flow position. A fail-safe mechanism urges the throttle valve toward an intermediate position between the minimum and maximum fluid flow positions to prevent inoperability of the engine during failure of the actuator mechanism.

Fail safe throttle positioning system

A throttle device of internal combustion engine, wherein a speed reduction gear mechanism for transmitting the power of a motor to a throttle valve stem, an installation space for a default opening setting mechanism which holds the opening of a throttle valve to a specified opening (default opening) when an engine key switch is turned off, and a gear cover mounting frame for bordering the installation space are formed on one of the side wall surfaces of a throttle body, the height of the frame is made lower than the installation height of the speed reduction gear mechanism, a gear cover for covering a gear installation space is installed on the frame, a stopper for limiting the default opening and a stopper for limiting the fully closed position of the throttle valve are disposed adjacent to each other so that their positions can be adjusted from the same direction, and the stopper receives a default lever and the stopper receives a throttle gear so as to reduce the size and weight of an electrically controlled throttle device and also streamline the manufacture and adjustment operation of that device.

Throttle device of internal combustion engine

A throttle device for an internal combustion engine is provided which comprises an electric drive actuator (5) for opening and closing a throttle valve (2) based on a signal controlling an intake air flow rate of the internal combustion engine A gap between a throttle valve shaft (3) driven to open and close the throttle valve (2) by said electric drive actuator (5) and a shaft inserting through hole for guiding said throttle valve shaft (3) to a bearing (20) provided in a wall portion of a throttle body (100) is filled with an air leak preventing

Throttle apparatus for an internal combustion engine

The system described enables, in the event of failure of the electric actuator (13) on the throttle (11) or of the control or power supply to said actuator, operation in the emergency mode and prevents in a reliable manner the blocking of the throttle (11) in a rest position. A return spring (15) is provided which is permanently meshed with the shaft (12) of the throttle and a preloaded opposing spring (21) with partial meshing with said shaft (12), said springs co-operating with an electromotive actuator (13).

System for regulated dosing of combustion air into an internal combustion engine

A method and apparatus for detecting when the internal resistance of an oxygen sensor is too high for useful signal processing. A reference voltage is applied to the sensor signal to generate a test voltage which is compared with two different threshold voltages. The three possible magnitude states of the test voltage with respect to the thresholds cause the comparator output signals to define logical conditions which are processed by logical gating circuitry to inhibit a timing circuit which otherwise would switch fuel mixture preparation from sensor-controlled operation to open-loop, direct control after a period of time.

Method and apparatus for monitoring the operation of an oxygen sensor

Einrichtung zur gesteuerten zumessung von verbrennungsluft in eine brennkraftmaschine

Verfahren und vorrichtung zur ueberwachung der betriebsbereitschaft einer lambda-sonde

An arrangement for regulating the idling rotational speed of an internal combustion engine includes a comparison stage which compares the actual and the desired rotational speed, an idling operation filling regulation device connected to the output of the comparison stage, including at least a proportional region, and controlling an electrically manipulated adjustment member for the adjustment of the amount of intake air in the idling operation position of the throttling damper, as well as an arrangement for the recognition of a jerky operation of the engine. The recognition arrangement is so constructed that it concludes from the frequency and intensity of periodically occurring rotational speed oscillations that a tendency to operate in a jerky manner is present and issues a signal which so influences the amplification degree of the proportional region of the regulating device for the idling operation regulation that a manipulated variable from the proportional region is maintained during the increasing rotational speed and asymetrically substantially at the maximum achieved value or preferably is caused to gradually decrease with a selectable time constant, while being caused to decrease more rapidly after the detection of the decay of the jerky operation oscillations.

Method of and arrangement for regulating the idling rotational speed of an internal combustion engine

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