Abstract: A fuel injection control apparatus is capable of supplying a proper amount of fuel by improving response when the throttle position is abruptly changed. The fuel injection control apparatus includes an electronic control unit for determining a fuel injection time period for a fuel injection system, based on the engine speed and the throttle position. The electronic control unit is operable to determine a base fuel injection time period based on engine speed and throttle position to start fuel injection, and adjusts the initial fuel injection time period thereafter, based on changes in the engine speed and the throttle position.

Abstract: A photochemical hole burning medium is composed of a material in which a rare earth complex and a reducing agent is dispersed in a solid matrix. The rare earth complex may be at least one complex selected from the group consisting of a europium (III) crown ether complex, a europium (III) polyether complex, and a europium (III) cryptand complex.

Abstract: An engine control unit diagnoses whether or not a unit that controls a variable valve apparatus is failed, and when it is diagnosed that the unit is failed, the engine control unit shuts off the power supply to a drive circuit for an actuator of the variable valve apparatus.

Abstract: A plurality of reference signals output from a controller which computes an operation amount of an electric actuator is subjected to the logical operation, and the power supply to a drive circuit for the electric actuator is shut off based on an output by the logical operation.

Abstract: A fuel injection valve control to correctingly increase the fuel amount appropriately for realizing a favorable acceleration performance at the time of accelerating after a throttle full closure period is finished.

Abstract: A steering damper is provided coaxially with a steering shaft, and a handlebar load is provided by causing a variable valve to generate damping force, using rotation of the steering shaft. The damping force is variably controlled in response to vehicle speed. The damping force is fixed to a minimum value C1 for vehicle speeds equal to or below first reference speed V1, fixed to a maximum value C2 for vehicle speeds equal to or above second reference speed V2, and variably controlled in response to vehicle speed and acceleration in an intermediate speed range. Fine maneuverability of a vehicle body is achieved by reducing a load on a handlebar at low vehicle speeds, and a stable movement of the vehicle body is maintained at high vehicle speed by increasing the load on the handlebar and thereby suppressing deflection of the handlebar.

Abstract: In a control apparatus for controlling an intake air amount of an engine by variably controlling a lift amount of an intake valve, when a variable valve lift mechanism is failed, the control is switched to a control of the intake air amount based on an opening degree of a throttle valve, and also the opening degree of the throttle valve is restricted within an upper limit value in order to ensure a negative pressure utilized by a brake booster.

Abstract: The present invention is constructed such that there is provided a variable valve opening mechanism which varies an opening of an engine valve continuously, the opening of the engine valve is feedback controlled to a target opening and at the same time, at least the opening of the engine valve relative to controlled variable of a first reference opening is detected to be learned at an initial time, and after the initial learning, the opening of the engine valve relative to controlled variable of a second reference opening different from the first reference opening is detected to be learned, and based on the initial learning result and a newest learning result of the second reference opening, an opening detection characteristic of an opening sensor is learned.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a lift amount of an intake valve, when a target lift amount of the intake valve is a predetermined value or less, the target lift amount of the intake valve is limited to the predetermined value or above when the combustion variation reaches an allowable value or above.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies at least a valve operating characteristic (valve lift amount and the like) of an intake valve, a target intake air amount equivalent to a target torque is set based on operating conditions of the engine, to calculate a target volume flow ratio by dividing the target intake air amount by an engine rotation speed and total cylinder volume. The target volume flow ratio is corrected according to closing timing of the intake valve. If the valve lift amount of the intake valve is in a low valve lift region, the target volume flow ratio is further corrected according to the valve lift amount, and the post corrected target volume flow ratio is converted into a valve opening area of the intake valve to be set as a target valve opening area. Then, based on the target valve opening area, a target valve operating characteristic of the intake valve is set.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies at least a valve operating characteristic (valve lift amount, valve operating angle and the like) of an intake valve, a target volume flow ratio equivalent to a target torque of the engine is obtained to be converted into a valve opening area, and a target valve operating characteristic of the variable valve mechanism is set based on the converted valve opening area, to control the variable valve mechanism so that an actual valve operating characteristic reaches a target valve operating angle, thereby executing with high accuracy an intake air amount control mainly by the variable valve mechanism.

Abstract: When any one of a plurality of variable valve characteristic mechanisms which vary different operating characteristics of an intake valve is failed, a limit which is capable of satisfying predetermined conditions for a change in opening timing of the intake valve at the time when the other operating characteristic is varied by the normally operating variable valve characteristic mechanism, is set and the operating characteristics of the intake valve are controlled while limiting the intake valve opening timing by the limit, by the normally operating variable valve characteristic mechanism.

Abstract: The present invention is constructed such that there is provided a variable valve opening mechanism which varies an opening of an engine valve continuously, the opening of the engine valve is feedback controlled to a target opening and at the same time, at least the opening of the engine valve relative to controlled variable of a first reference opening is detected to be learned at an initial time, and after the initial learning, the opening of the engine valve relative to controlled variable of a second reference opening different from the first reference opening is detected to be learned, and based on the initial learning result and a newest learning result of the second reference opening, an opening detection characteristic of an opening sensor is learned.

Abstract: In an internal combustion engine in which fuel injection valves are arranged upstream from and downstream from the throttle valve, respectively, the response of the accelerated increase in quantity and correction will be improved. The total injection quantity determination unit determines a total quantity of fuel to be injected from each fuel injection valve. The injection rate determination unit determines an injection rate of the upstream injection valve. The injection quantity correction unit includes an accelerated increase in quantity and correction unit, and during acceleration, increases and corrects only the injection quantity of the downstream injection valve during acceleration.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a valve operating characteristic (valve lift amount and valve operating angle) of an intake valve, the valve operating characteristic of the intake valve is detected and an intake air amount controlled by the intake valve is calculated based on the detected valve operating characteristic. Then, a change (change rate, change amount) between the newest intake air amount calculation value and a past intake air amount calculation value is calculated, and the newest engine controlled variable is calculated based on the change and engine controlled variable (basic fuel injection quantity and the like) set in the past, and then the calculated newest engine controlled variable is output for executing an engine control.

Abstract: When it is detected that any one of a plurality of variable valve characteristic mechanisms disposed for every cylinder groups is failed, an effective opening degree (valve lift amount, valve operating angle or the like) in a valve characteristic in the failed state, is obtained. When the effective opening degree is judged to be a predetermined value or above, the valve characteristic of the normal variable valve characteristic mechanism is controlled to be coincident with the valve characteristic in the failed state. When the effective opening degree is judged to be less than the predetermined value, there is performed a control for limiting the control to coincide the valve characteristic of the normal variable valve characteristic mechanism with the valve characteristic in the failed state.

Abstract: In an internal combustion engine equipped with a variable valve operating mechanism that performs a valve timing control and a valve lift amount control of at least one of an intake valve and an exhaust valve, target values of the valve timing and the valve lift amount set based on an engine operating condition are limited by a limit value to limit a control range of one of the valve timing and the valve lift amount in accordance with a control state of the other of the valve timing and the valve lift amount, so that the valve timing and the valve lift amount are controlled based on the respective target values one of which has been limited as above.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a lift amount of an intake valve, when a target lift amount of the intake valve is a predetermined value or less, the target lift amount of the intake valve is limited to the predetermined value or above when the combustion variation reaches an allowable value or above.

Abstract: A rotation phase of a camshaft relative to a crankshaft is detected based on a crank angle signal and a cam angle signal, and also the currents or voltages of electromagnetic brakes constituting a variable valve timing mechanism are converted into the rotation phase, to estimate a change in the rotation phase during the rotation phase is detected, based on the rotation phase obtained by converting the currents or voltages.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies a valve operating characteristic (valve lift amount and valve operating angle) of an intake valve, the valve operating characteristic of the intake valve is detected and an intake air amount controlled by the intake valve is calculated based on the detected valve operating characteristic. Then, a change (change rate, change amount) between the newest intake air amount calculation value and a past intake air amount calculation value is calculated, and the newest engine controlled variable is calculated based on the change and engine controlled variable (basic fuel injection quantity and the like) set in the past, and then the calculated newest engine controlled variable is output for executing an engine control.