Pioneer Electronic Corporation

Honda Giken Kogyo Kabushiki Kaisha

Masaya Adachi

Hitoshi Ando

Hayato Yoshida

Tsutomu Honda

Masashi Shimakata

Shinichi Takemura

Shigeru Tsujimura

Tohru Yoshihara

Isao Endo

Yoshiaki Hirakata

Shinji Saito

Shozaburo Sakaguchi

Junichi Shibata

Akihiko Hamazaki

Norimasa Hattori

An apparatus for controlling an ignition timing of an engine is capable of reducing or preventing occurrences of backfires. The apparatus includes a no-load deceleration state detector for detecting that an engine is in a no-load deceleration state. An engine speed detector detects an engine speed. An advanced timing setting unit sets an advanced ignition timing (retard amount) in situations where the occurrence of backfires are likely, such as during the no-load deceleration state. A converter determines an ignition angle &thgr; on the basis of an output pulse of a pulse generator and an advance amount provided by the advanced ignition timing setting unit.

Apparatus for controlling ignition timing of engine

A stroke judgment device includes a gear having a portion with no teeth, a pulse generator, an intake pipe internal pressure detecting device and an ECU. The ECU controls an injector(s) and the ignition timing of a spark plug(s). The ECU mainly includes a phase detecting device for detecting the phase of the crankshaft, a first stroke judging device for judging stroke based on detected phase and intake pipe internal pressure, a rotational cycle detection device for detecting rotational cycle of the crankshaft, a comparison device for comparing two rotation cycles of specified phase, a second stroke judging device for judging stroke based on results of comparison, and selection device for selecting one of the first stroke judging device or the second stroke judging device.

Stroke judging device for a 4-cycle engine

A navigation apparatus for a vehicle using a GPS (Global Positioning System) as sensing means in which information on the basis of sensing results, such as a present position, a running locus and the like are displayed in a predetermined form of display on a display section is disclosed. In cases where the GPS receiver cannot receive radio waves from artificial satellites, and sensing thus becomes disabled, a sensed final present position is displayed with an altered form of display.

Navigation apparatus for vehicles

A navigation apparatus for a vehicle using a GPS (Global Positioning System) as sensing means in which information on the basis of sensed results, such as a present position, a running locus and the like are displayed in a predetermined form of display on a display section is disclosed. In cases where the GPS receiver cannot receive radio waves from artificial satellites, and sensing thus becomes disabled, a sensed final present position is displayed with an altered form of display.

A navigation system for a vehicle which does not bewilder a driver of the vehicle with heading indication also when the driving speed of the vehicle is low. The navigation system comprises a GPS receiver, a display unit, a map memory in which a map is stored, a detecting section for detecting a driving position and a driving direction of the vehicle from information received from the GPS receiver, and a controller. The controller receives information of a driving speed of the vehicle from the vehicle and controls, when the driving speed is equal to or higher than a preset speed, the display unit to indicate on a display screen thereof the driving position and driving direction of the vehicle received from the detecting section together with the map received from the map memory, but controls, when the driving speed is lower than the preset speed, the display unit to indicate only the driving position of the vehicle received from the detecting section together with the map received from the map memory.

Navigation system for vehicle

A satellite signal tracking system for a GPS receiver, wherein a GPS satellite is recaptured within a very short period of time, after the interruption of reception is cleared as by passing through a tunnel and the like, by widening a band width of the PLL search frequency gradually every after repeating the search for the satellite signal, performing a narrow-band search repeatedly as varying its center frequency along the Doppler shift curve, performing a narrow-band search for a specific period of time which is given by dividing the capture range of the PLL circuit by the Doppler shift rate and a wide-band search with use of an estimated satellite signal receiving frequency which is given by recalculating the Doppler frequency of the GPS satellite at the very moment according to the almanac data of the GPS satellite and is assigned as the center frequency, and, still further, performing the search for GPS satellites repeatedly with the estimated satellite signal receiving frequency in the center for recovering the function to perform the positional reckoning which is the primary function of the GPS receiver.

Growing community of inventors

Saitama, Japan

Masaya Adachi