Hitachi, Ltd.

Shinsuke Takahashi

Teruji Sekozawa

Makoto Shioya

Motohisa Funabashi

Toshio Manaka

Tohru Watanabe

Seiji Asano

Masami Shida

Mikihiko Onari

Gohki Okazaki

In a vehicle equipped with an engine and a regenerative system, the quantity of energy storage by the regenerative system is scheduled, and fuel efficiency and driving ease are controlled. If the destination of a vehicle and a route to reach it are not indicated, automatic scheduling is performed. Vehicle scheduling is performed by predicting the distribution of height positions the vehicle is predicted to reach at future points of time and using the representative value of the height at each point of time.

Method for controlling a hybrid vehicle

To improve a control characteristic of an air/fuel ratio during not only a normal driving operation, but also a transition driving operation,

Method for calculating air flow rate at cylinder port and throttle valve

A learning control method for an electronic engine control system in which a variable concerning the adhesion of injected fuel onto a wall surface of an intake manifold, the evaporation of adhered fuel or the runaway of fuel to a cylinder is determined on the basis of a detection value of the operating state of an engine in accordance with a predetermined relational expression and the quantity of fuel injection is controlled on the basis of the determined value of the variable so that a target air/fuel ratio is realized, comprises the steps of determining the degree of deviation of an air/fuel ratio from the target value after the engine has been turned from a steady operating state into a transient operating state, determining a range in which the detection value of the engine operating state as the base of determination of the variable has changed upon occurrence of a fuel injection quantity control error which causes the deviation of the air/fuel ratio from the target value, and correcting a corresponding relationship between the engine operating state and the variable in the determined range of change on the basis of at least the degree of deviation of the air/fuel ratio from the target value by use of a rule-based inference.

Learning control method for fuel injection control system of engine

To ensure a high-precision simultaneous control of the enginegenerated torque, air fuel ratio of the automobile engine and related factor, the present invention calculates the target air mass flow rate as the air mass flow rate at the inlet port which achieves the target torque, estimates the air flow condition inside the intake manifold, supplies the result to the fuel injection control system and the throttle control system, and determines the fuel injection pulse width which achieves the target air fuel ratio according to the estimated air mass flow rate at the inlet port for the fuel injection control system, while determining the throttle angle which achieves the target torque according to the estimated condition and the target air mass flow rate for the throttle control system.

Method and system for engine control

A method and an apparatus for control of engine fuel injection are characterized by detecting the state of the acceleration of the engine and also judging whether or not the engine is in a specific acceleration state, by, when the engine is judged to be in a specific state of acceleration, using such a value as a crank shaft angle obtained in advance in order to predict the air mass flow rate of the air flowing into a specific cylinder having undergone a fuel injection, by using the predicted air mass flow rate or the crank shaft angle to determine a proper asynchronous fuel injection quantity for the above-mentioned acceleration state for the specific cylinder, and then by performing an asynchronous injection. In this way, it is possible to calculate the shortage of fuel occurring with the synchronous injection even at the early stage of acceleration by using various variables so as to determine a proper supplemental fuel supply quantity (asynchronous injection quantity) for achieving a desired air fuel ratio in various drive modes.

Method and apparatus for control of engine fuel injection

A future value is predicted based on time-serial data of measurement data heretofore available to attain high precision control of fuel injection of an engine, by providing: (1) an unit for determining an acceleration/deceleration level representing a magnitude of acceleration/deceleration of a vehicle based on a displacement of a throttle opening degree in a predetermined time, (2) an unit for predicting the future value by a digital advancing filter based on measurement data heretofore available, and (3) a correction unit for calculating a measurement amount which is under or over when the predicting process is conducted, in accordance with the acceleration/deceleration level, and adding the calculated measurement value to said predicted value to calculate the future value of the measurement data. Where a table for converting outputs of various sensors arranged around the engine etc. to physical amounts such as suction air amount, an unit for increasing the search speed for the table is provided.

Method for predicting a future value of measurement data and for

A method for controlling an internal combustion engine employing an exhaust gas recirculation system wherein a fuel injection amount is controlled corresponding to a calculated cylinder air mass flow rate and the method comprises the steps of: deriving a flow rate of a recirculated exhaust gas flowing into an induction passage of the engine; predicting a partial pressure of the exhaust gas within the induction passage on the basis of the flow rate of the recirculated exhaust gas; and deriving the cylinder air mass flow rate on the basis of the predicted value of the partial pressure of the recirculated exhaust gas. The method can also be applied to a system employing a parameter representative of fuel transfer characteristics derived by using measured values of parameters including an internal pressure in an induction passage of the engine, and the fuel injection amount is controlled depending upon the parameter representative of the fuel transfer characteristics, with the method comprising the steps of: deriving flow rates of the intake air and the recirculated exhaust gas introduced into the induction passage; predicting a total pressure in the induction passage on the basis of the intake air mass flow rate and the recirculated exhaust gas flow rae flowing in the induction passage; and deriving a parameter representative of fuel transfer characteristics in the induction passage on the basis of predetermined parameters including the total pressure.

Method for detecting cylinder air amount introduced into cylinder of

In order to make the quantity of fuel in a cylinder approach a requested value with high accuracy, the characteristic of fuel transport is employed by use of a model in which all injected fuel adheres onto walls of the intake manifold and then a part of the fuel adhering to the walls is sucked off into the cylinder. By use of a respective model for each cylinder, the quantity of fuel injected into each cylinder is independently controlled so that the quantity of fuel in the cylinder is established to be a requested value.

Fuel injection control method in an engine

The disclosure concerns the control of fuel injection for automatic control of engines simulating the accuracy of fuel injection control that would be obtained with flow sensors and pressure sensors, without actually employing such sensors. This is true because the theoretical model used for estimating the flow is matched with actual system performance. Maching is obtained by estimating a level of the atmospheric pressure, a flow of air passing through a throttle valve and a flow of air flowing into the cylinder, and controlling the fuel injection based upon the flow of air flowing into the cylinder. The result is a highly accurate estimation of the valves.

Controlling engine fuel injection

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

In an engine control apparatus for controlling the amount of fuel to be supplied by calculating the amount of liquid film or fuel adhered to an intake pipe of an engine, the adhesion rate of fuel and the time constant of evaporation of fuel in a preestimating manner, the time constant of evaporation is determined on the basis of the determined amount of liquid film, the amount of suction air and an air-to-fuel ratio upon fuel cut and the adhesion rate is determined on the basis of the amount of supply of fuel, the amount of suction air and an air-to-fuel ratio upon fuel recovery.

Engine control apparatus

A novel engine control method is disclosed in which in order to dampen the longitudinal oscillation of a vehicle such as an automobile and to prevent the deterioration of the exhaust gas purification performance thereof, the longitudinal acceleration or the engine speed of the vehicle is detected, and the detected vehicle acceleration or engine speed, as the case may be, is differentiated. A signal with the phase of the differentiated value advanced by a specific value is produced and used to compensate for the fuel injection time or a target value of throttle opening degree.

Growing community of inventors

Yokohama, Japan

Shinsuke Takahashi