Hitachi, Ltd.

Jatco Corporation

Xanavi Informatics Corporation

Mikihiko Onari

Motohisa Funabashi

Teruji Sekozawa

Makoto Shioya

Takeshi Atago

Hiroshi Kuroda

Masatoshi Hoshino

Yasuo Morooka

Ryoichi Sasaki

Yasuhiro Gunji

Masami Shida

Shigeru Oho

Hiroatsu Tokuda

Shinichiro Miyaoka

Kuniaki Matsumoto

Shinsuke Takahashi

Fumio Wakamori

Akihiro Aoyama

Yoshio Matsuoka

Gohki Okazaki

Hidehiro Kitanosono

Nihei Tachi

Takazo Hirano

Mamoru Kata

Kenji Takano

Masasumi Kokawa

Yoshimasa Nagashima

To perform the proper control conforming to the intent of a driver of an automotive vehicle under any condition which is encountered by the vehicle, optimum control methods are preliminarily classified in accordance with categories relating to conditions of the vehicle and categories relating to intents of the driver and the classified optimum control methods are stored in a memory, thereby selecting one of the control methods corresponding to the combination of the categories to which the vehicle condition and the driver's intent detected during the running of the vehicle belong.

Condition adaptive-type control method for internal combustion engines

A portable position detector and a position management system that are capable of accurately detecting the direction of a walking body even when GPS signals cannot be received (or without reception) and thereby enhancing the accuracy of the dead reckoned position of the walking body. The portable position detector is equipped with a pedometer and a geomagnetic sensor. With the pedometer, the moved distance of a walker is detected by a calculation of 'the number of steps.times.the length of a step'. The moved direction is detected with the geomagnetic sensor. With this, the moved position of the walker is accurately detected by the self-contained navigation system. Particularly, even in the case where the position detector is located in a forest or between buildings where a signal cannot be received from a global positioning system (GPS) due to high buildings, banks, and forests, the position detector with a portable size and weight applicable to a walker can know with a practically sufficient degree of accuracy the position of a person carrying this portable detector by the self-contained navigation system.

Portable position detector and position management system

A navigation system which can enhance the position determining accuracy of a mobile object without employing any high precision measuring instrument. The navigation system comprises a GPS range measuring device, an angular velocity measuring device, a velocity measuring device and an azimuth measuring device, which measure the motion of the mobile object; a GPS range error estimating device, an angular velocity error estimating device, a velocity error estimating device and an azimuth error estimating device, which estimate errors involved in the respectively corresponding measuring devices; and a position calculating device which calculates the position of the mobile object from the outputs of the error estimating devices. The error estimating devices are implemented by Kalman filters and averaging processes. The factors of the errors of the individual measuring devices are assumed, and the outputs thereof are corrected, so that the position of the mobile object can always be determined at a high accuracy without employing any high precision sensor.

Navigation system furnished with means for estimating error of mounted

An electronic engine control apparatus includes: a plurality of first sensors for detecting the driving action taken in accordance with a driver's intent; a plurality of second sensors for detecting the operating conditions of a vehicle and an engine; a plurality of actuators for controlling the engine; a unit for discriminating the driver's intent of how to drive the vehicle based on output signals from the first and second sensors; and a unit for controlling the engine to match the driver's intent by selectively adjusting at least one of the actuators, in accordance with the discriminated driver's intent.

Electronic engine control apparatus

An adaptive control system for categorized engine conditions is disclosed in which the engine conditions to be controlled are discriminated and classified in accordance with the driver's intent and the vehicle operating conditions. It is decided that a given engine control condition is continued or the transition is under way between different control conditions as a history judgement, and a vehicle operation parameter is determined in accordance with the determined history. At the same time, in accordance with the control condition decided and classified, an operating signal is applied to the engine with an operating parameter thus determined and the result of engine control response is observed to update the adaptive parameter.

Adaptive system for controlling an engine according to conditions

An electronic control system for an internal combustion engine includes a plurality of first sensors for measuring a drive action taken in accordance with a driver's intent, a plurality of second sensors for measuring operating conditions of an engine, a plurality of actuators for controlling the engine, a unit for setting a target reference by selecting one among a plurality of target references for engine control, and a unit for manipulating the actuators responsive to the established target reference to control the engine.

Electronic engine control method and system for internal combustion

An electronic control system for an internal combustion engine includes a plurality of first sensors for measuring a driver action taken in accordance with a driver's intent, a plurality of second sensors for measuring operating conditions of an engine, a plurality of actuators for controlling the engine, a unit for setting a target reference by selecting one among a plurality of target references for engine control, and a unit for manipulating the actuators responsive to the established target reference to control the engine.

In a fuel supply control method of an automobile engine wherein a plurality of parameters representing an operating condition of the engine are measured, and a fuel supply quantity is determined based on the measured values so as to attain a target air-fuel ratio, an amount of air flowing into each cylinder in an n-th stroke (n is an arbitrary integer) is calculated for prediction by using the measured parameters in a stroke preceding the n-th stroke, and the fuel supply quantity is determined by the predicted value of the amount of air in the n-th stroke and a target value of the air-fuel ratio in the n-th stroke.

Method of controlling fuel supply to engine by prediction calculation

A system for electronically controlling an engine for a vehicle is disclosed which is of the kind electrically controlling the opening of a throttle valve controlling the quantity of intake air supplied to the engine. The electronic engine control includes setting a target acceleration of the vehicle according to an amount of depression of an accelerator pedal by the driver, comparing the target acceleration with an actual acceleration of the vehicle to find an error therebetween, setting a target value of the throttle valve opening on the basis of the acceleration error, and controlling the throttle valve opening until it attains the target value.

System and method for electronic control of internal combustion engine

The fuel injection quantity required for maintaining the air-fuel ratio of the mixture supplied to each cylinder of an engine at a desired value is determined by a deposition rate X at which injected fuel deposits and forms a film mass on an intake manifold wall of the engine and a vaporization rate 1/.tau. at which the film mass vaporizes from the manifold wall, a current film mass quantity M.sub.f determined from the calculated X and l/.tau. and the fuel quantity by the preceding injection, a desired fuel quantity Q.sub.a /(A/F) to be supplied air-fuel ratio A/F in accordance with the following equation ##EQU1## an air-fuel ratio feedback correction factor .gamma. aiming at a stoichiometric air-fuel ratio based on a signal generated by an O.sub.2 sensor is calculated and an actual quantity of fuel corresponding to G.sub.f .multidot..gamma. is injected. A film mass quantity in a current computing cycle is based on the film mass quantity calculated during the previous computing cycle.

Control method for a fuel injection engine

A method of controlling the quantity of fuel to be injected into an intake manifold for an engine by a fuel injection unit comprising the steps of identifying parameters indicative of a change in the dynamic characteristic of the fuel supply system due to changes in the environmental conditions including the atmospheric pressure and engine temperature, estimating the quantity of fuel to be supplied to the engine cylinder on the basis of the identified parameters, and controlling the quantity of fuel to be injected so that the ratio between the measured quantity of air supplied to the engine cylinder and the estimated quantity of fuel supplied to the engine cylinder attains the desired air-fuel ratio.

Method of fuel injection control in engine

An analogical inference apparatus for control system is disclosed in which, in order to be able to generate a control signal to a system, which is to be controlled, even when conditions to be premised are unknown, the degree of similarity between the detected control signal from a sensor incorporated in the system and one of the predetermined control conditions stored in a memory is estimated by estimation means, and then a control value is inferred in accordance with the result of the estimation.

Analogical inference method and apparatus for a control system

A water level control system for a reservoir includes steps of detecting water level, outflow rate and inflow rate of the reservoir detecting modified water level corresponding to the reservoir's content depending on the actual water level, the outflow rate and the inflow rate, and controlling the outflow rate of the reservoir in response to a deviation value between a set reference and the modified water level, thereby reducing the influence of undesirable water level fluctuation.

Growing community of inventors

Kokubunji, Japan

Mikihiko Onari