Abstract:
In an internal combustion engine, which is provided with a variable valve mechanism that varies an open/close characteristic of an intake valve, a target open/close characteristic of the intake valve is determined. Simultaneously, a control speed at a time when the intake valve is controlled to have the target open/close characteristic is determined. As a result, the variable valve mechanism is controlled according to the target open/close characteristic and the control speed.
Abstract:
When a variable valve mechanism which varies an opening characteristic of an engine valve is malfunctioned, the power supply to a drive circuit for the variable valve mechanism is stopped, and also a control signal to the drive circuit is cleared.
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:
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:
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. The injection quantity determination unit determines the injection quantity of the upstream injection valve on the basis of the injection rate and the total injection quantity, and determines the injection quantity of the downstream injection valve on the basis of the upstream injection quantity and the total injection quantity.
Abstract:
In a constitution to control a valve lift amount of an intake valve to achieve a target intake air amount, a target valve overlap amount is calculated based on an engine load and an engine rotation speed, and target valve timing is calculated based on a target valve lift amount and the target valve overlap amount, so that the valve overlap amount is maintained at a requested value corresponding to operating conditions.
Abstract:
In an internal combustion engine provided with a variable valve operating apparatus which variably changes a valve operating characteristic of at least one of intake and exhaust valves, a reference intake pipe pressure and a reference fresh air ratio corresponding to a reference operating condition of the variable valve operating apparatus are computed based on the detection value of the engine operating condition, a fresh air ratio correction amount corresponding to an operating condition of the variable valve operating apparatus is computed based on the detection value of the intake pipe pressure and the reference intake pipe pressure, the reference fresh air ratio is corrected based on the computed fresh air ratio correction amount to compute a final fresh air ratio, and an operating amount of the control object in the internal combustion engine is computed based on the final fresh air ratio to operate the control object.
Abstract:
A required fuel amount for an engine is calculated at a predetermined calculation cycle. A fuel injection amount to be injected from an upstream injection valve and a fuel injection amount to be injected from a downstream injection valve are then calculated. After fuel injection on the basis of the calculated fuel injection amounts, a lack of fuel delivered by the fuel injection amounts immediately before re-calculation of a required fuel amount at the calculation cycle until the end of an intake stroke (end of an intake valve opening period), is calculated by subtracting the fuel injection amounts from the re-calculated required fuel amount. The calculated lack of fuel amount is injected from the downstream injection valve during the intake stroke, e.g., in stages 6 and 7. A portion of a fuel injected from each of the fuel injection valves which has adhered on an inner wall of an intake pipe and subsequently released to be later supplied to the engine, is calculated in accordance with a predetermined adhesion ratio and a predetermined release ratio. The above lack of fuel amount is determined in consideration of the calculated portion of the fuel. The lack of fuel amount is additionally injected, e.g. a fuel correction amount, even during an engine transient state, and engine operability and fuel consumption are improved.
Abstract:
An engine with a charger, in which an intake passage is provided with a throttle valve which is electronically controlled to a target opening degree and the charger on the upstream side of the throttle valve, wherein a target supercharged pressure is corrected in a direction of eliminating a delay in the intake air amount based upon a difference between the target supercharged pressure of the charger and the supercharged pressure detected on the upstream side of the throttle valve, to thereby set a target supercharged pressure of the throttle valve based on the corrected target supercharged pressure. This suppresses a delay in the intake air amount caused by a delay in the change of the supercharged pressure during the transient period, makes it possible to accomplish acceleration/deceleration performance of good response, and suppresses a torque difference that occurs when the combustion system is changed over to the stratified charge combustion or to the homogeneous combustion.
Abstract:
Erroneous diagnosis caused by a case where hardware other than an ALU (arithmetical and logic unit) has a function to access a RAM directly due to the construction of a CPU is to be prevented. In order to do so, interrupt is prohibited at every predetermined diagnosis timing. Then, determination is made as to whether a start-up of a DMAC (direct memory access controller) is approved or not, and only when the start-up is not approved, the diagnosis is performed to a diagnosis object RAM by previously determined diagnosis unit bytes at a time through a read/write method. When failure of the RAM is determined, the diagnosis procedure is advanced to an NG process. When the start-up of the DMAC is approved, the diagnosis of the diagnosis object RAM is prohibited, and the address of the object RAM is stored in a memory so that the object RAM is diagnosed at a next diagnosis timing.