Toyota Jidosha Kabushiki Kaisha

Yuichiro Ido

Harufumi Muto

Naohide Fuwa

Kiyoo Hirose

Yuuji Miyanoo

Daisuke Kobayashi

Ippei Yamazaki

Eiji Kasai

Shuji Fujita

Yutaka Aoki

Kakuji Kagoshima

An abnormality determination apparatus for an intake amount control mechanism according to the invention includes a control portion which sets an allowable range of an opening amount of a throttle valve which provided in an intake passageway of an internal combustion engine based at least on an index value of an engine operation state, including an operation amount of accelerator, and on a lift working angle of an intake valve, and which determines that an abnormality is present in a state of driving of the throttle valve if an actual opening amount of the throttle valve is outside the allowable range set.

Abnormality determination apparatus for intake amount control mechanism

An electric power steering device, including an electric motor supplied with power from a power supply device to generate a predetermined steering assistance force for a steered wheel, and an assistance control device the controls the amount of electrical power supplied to the electric motor, according to the steering state of a steering wheel. The assistance control device detects the power supply voltage of the power supply device. The assistance control device controls the electrical current supplied to the electric motor, so as to maintain the power supply voltage greater than or equal to a set voltage which is set in advance.

Electric power steering device

A control device of an internal combustion engine determining a target throttle opening degree based on a target intake air amount which can simply and reliably detect any control abnormality is provided. The control device of an internal combustion engine determining a target throttle opening degree based on a target intake amount compares the target intake air amount and an intake air amount measured by an air flow meter to detect a control abnormality. By this control device, it is possible to simply and reliably detect a control abnormality in the process of determination of the target throttle opening degree or control of the throttle valve.

Control device of internal combustion engine

A control device of an internal combustion engine which determines a target throttle opening degree in accordance with a required intake pipe internal pressure and which suppresses the occurrence of hunting of the throttle opening degree is provided, wherein, when the required intake pipe internal pressure becomes a predetermined pressure or more, the target throttle opening degree is determined by adding an addition-corrected throttle opening degree calculated in accordance with a difference between the required intake pipe internal pressure and the predetermined pressure based on a predetermined equation to an opening degree of a throttle valve making the intake pipe internal pressure the predetermined pressure.

An intake amount control apparatus of an internal combustion engine in accordance with the invention includes a control portion that controls an opening amount of a throttle valve provided in an intake passageway of the internal combustion engine and operation of a lift amount changing mechanism capable of changing a lift amount of an intake valve. The control portion controls the operation of the lift amount changing mechanism so that, prior to execution of a fuel cut control at the time of an engine deceleration, the lift amount of in intake valve becomes smaller than at the time of a normal engine idle operation where the fuel cut control is not executed.

Intake amount control apparatus of internal combustion engine

An intake pipe downstream of a throttle valve is interconnected with an exhaust pipe via an EGR supply pipe and an EGR control valve is disposed in the EGR supply pipe. An engine load ratio (KLoff) in the engine steady operation with the EGR gas being not supplied, and another engine load ratio KLon in the engine steady operation with the EGR gas being supplied are expressed with respective linear functions of an intake pipe pressure (Pm) and stored in advance. The intake pipe pressure (Pm) is detected, KLoff and KLon are calculated from the detected intake pipe pressure (Pm) using the linear function expressions and, then, a difference between these values &#x394;KL (=KLoff&#x2212;KLon) is calculated. Based on the difference (&#x394;KL), the EGR control valve passing-through gas amount, which is an amount of the EGR gas passing through the EGR control valve, is calculated.

Apparatus for calculating amount of recirculated exhaust gas for internal combustion engine

A control system of an internal combustion engine provided with a throttle valve passage air flow calculation equation by which the throttle valve passage air flow mt is expressed as a function of the downstream side intake pipe pressure at the downstream side of the throttle valve and a cylinder intake air flow calculation equation by which the cylinder intake air flow mc is expressed as a function of the downstream side intake pipe pressure, where said downstream side intake pipe pressure Pm and cylinder intake air flow mc when the throttle valve passage air flow mt found from said throttle valve passage air flow calculation equation and the cylinder intake air flow mc found from said cylinder intake air flow calculation equation match are calculated as the downstream side intake pipe pressure Pmta and cylinder intake air flow mcta at the time of steady operation under the operating conditions at that time is provided.

Control system of internal combustion engine

A target value of an engine load ratio is calculated. A target throttle opening required for making the actual engine load ratio equal to the target engine load ratio is calculated on the basis of an intake pipe pressure which is a pressure in the intake passage downstream of the throttle valve. A convergent throttle opening, which is a throttle opening to which the actual throttle opening converges assuming that the target intake air amount is kept at the calculated target intake air amount, is calculated. A final target throttle opening is set to the target throttle opening when the engine transient operation is in process, and to the convergent throttle opening when the engine steady operation is in process. Then, the throttle valve is driven so that the actual throttle opening is made equal to the final target throttle valve.

Control device for internal combustion engine

A target value of an engine load ratio is calculated. A target throttle opening required for making the actual engine load ratio equal to the target engine load ratio is calculated on the basis of an intake pipe pressure which is a pressure in the intake passage downstream of the throttle valve. It is judged whether the target throttle opening can be realized by a step motor. A final target throttle opening is set to a maximum or minimum throttle opening which can be realized by the step motor when it is judged that the calculated target throttle opening cannot be realized by the step motor. The step motor drives the throttle valve so that the actual throttle opening is made equal to the final target throttle opening, and the intake pipe pressure is estimated on the basis of the final target throttle opening.

Growing community of inventors

Nishikamo-gun, Japan

Yuichiro Ido