Toyota Jidosha Kabushiki Kaisha

Akihiro Yanai

Takashi Izuo

Yoshinori Kadowaki

Toshio Fuwa

Hiroyuki Hattori

Masahiko Asano

Tatsuo Iida

Iwao Maeda

Tatuo Iida

Keiji Yoeda

Isao Matsumoto

Mitsugu Makita

Kenji Tsubone

Shoji Katsumata

Yuichiro Hayase

Takuya Yamamoto

Yoh Satoh

A GNSS receiver includes: a first correlation peak detecting unit () that detects a peak of a correlation value between a positioning signal and a C/A code replica signal; a second correlation peak detecting unit () that detects a peak of the correlation value through a multipath error reduction technique; a signal intensity detecting unit () that detects a signal intensity of the positioning signal; a switching unit () that inputs the positioning signal to the second correlation peak detecting unit () when the signal intensity is higher than or equal to a threshold, and inputs the positioning signal to the first correlation peak detecting unit () when the signal intensity is lower than the threshold; a pseudo-range calculation unit () that calculates a pseudo-range based on the detected correlation peak; and a positioning calculation unit () that calculates a location of the GNSS receiver based on the pseudo-range.

GNSS receiver and positioning method

A main CPU determines whether or not there is a request for one valve driving based on an engine operating state such as an engine speed and a load factor, with reference to a control map. When it is determined that there is a request for one valve driving, it is determined whether or not there is an overlapping period between opening periods. When it is determined that there is no overlapping period, a high speed control is performed for controlling electromagnetically driven valves. When it is determined that there is no request for one valve driving, or when it is determined that there is the overlapping period, a low speed control is performed for controlling electromagnetically driven valves.

Electromagnetically driven valve control apparatus and electromagnetically driven valve control method for internal combustion engine

A valve is urged in the valve-opening direction by an upper spring and in the valve-closing direction by a lower spring. The valve is thus urged to a neutral position where the respective urging forces are balanced. The valve is controlled to be released from one of two terminal positions, that is, the full-open position or the full-closed position, and to be attracted to the position from which the valve has been released. The displacement pattern of the valve during this period is sensed by a displacement amount sensor, whereby the maximum displacement amount of the valve from that terminal position is measured. The change of the neutral position is detected based on the change of the measured maximum displacement amount with respect to a reference value.

Apparatus and method for detecting change of neutral position of valve of electromagnetic valve actuation system, and apparatus and method for controlling the valve

An electromagnetic valve drive apparatus of an internal combustion engine has a three-switching element in-series type drive circuit. Through switching operations of switching elements that are shared by eight electromagnetic coils consisting of upper coils and lower coils of four valves. The four valves include a first two valves that perform identical operations and a second two valves whose open period does not overlap the open period of the first two valves. The three-switching element in-series type drive circuit is able to supply current and to rapidly reduce, or discontinue, current through the electromagnetic coils. The electromagnetic valve drive apparatus is able to control the quantity of current through the electromagnetic coils while reducing the number of switching elements employed.

Electromagnetic valve drive apparatus of internal combustion engine

The invention relates to a control apparatus for controlling a solenoid valve that functions to displace one of an intake valve or an exhaust valve of an internal combustion engine. The object of the invention is to adjust, when a valve element connected to the solenoid valve is displaced between a valve-open position and a valve-closed position, the magnitude of an electromagnetic force displacing the valve element, to a controlled value based on a pressure acting on the valve element. The solenoid valve displaces the valve element ( ) by a cooperation of resilient forces of an upper spring ( ) and a lower spring ( ) and electromagnetic forces of an upper coil ( ) and a lower coil ( ). In the control apparatus, a pressure acting on the valve element ( ) is detected directly or indirectly. When the valve element is displaced from one of the valve-open position and the valve-closed position to the other position, the magnitude of an electromagnetic force to displace the valve element ( ) to the other position is adjusted to a controlled value based on the valve-element pressure detected.

Control device for solenoid driving valve

A solenoid valve actuating apparatus wherein an actuating circuit for controlling exciting currents to electromagnets for actuating a plurality of engine valves so that the engine valves will be opened and closed can be formed by a small number of switching means is provided. Two of the engine valves form one engine valve group, and the actuating circuit is provided for each of the engine valve groups. The actuating circuit includes three series circuits each having three switching means connected in series between a first line terminal on a high voltage side and a second line terminal on a low voltage side. Four of the electromagnets each corresponding to each of the engine valve groups connect connecting-in-series portions between the switching means between different series circuits.

Solenoid valve actuating apparatus

The present invention relates to an electromagnetically driven valve suited for use in an internal combustion engine and aims at achieving appropriate operating characteristics in accordance with operating conditions of the internal combustion engine at the time of opening or closing a valve body. An armature moving together with the valve body is provided and upper and lower cores are disposed on opposed sides of the armature. The upper core and the lower core accommodate upper and lower coils, respectively. An annular protrusion, formed not on the upper core but on the lower core only, has an inner diameter slightly larger than an outer diameter of the armature.

Electromagnetically driven valve for an internal combustion engine

An electromagnetic force generated in a valve driving apparatus is rapidly decreased when a valve body moves to a position close to the end of its stroke so that a shock generated when the valve body reaches the end of the stroke is reduced. The valve body is movable between opposite ends of its stroke so as to open and close a valve provided in an internal combustion engine. An electromagnetic coil generates an electromagnetic force exerted on the valve body. A current supplied to the electromagnetic coil is controlled in accordance with an operational condition of the internal combustion engine. The current flowing in the electromagnetic coil is rapidly decreased when the valve body approaches the end of its stroke.

Valve driving apparatus using an electromagnetic coil to move a valve

A method of detecting a fault of an electromagnetically-actuated intake/exhaust valve is disclosed. A valve body is supported in neutral position by the energizing force of an elastic member, and the electromagnetic force generated by supplying a current to the coils arranged on the two sides of a plunger is applied to the plunger thereby to operate the valve. A fault is detected based on a change of the current flowing in one coil attracting and holding the plunger with the inductance change of the same coil when the plunger is switched from the position of the same coil to the position of the other coil. This method improves the fault detection accuracy for the electromagnetically-actuated intake/exhaust valve over the prior art.

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Toyota, Japan

Akihiro Yanai