Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Nippondenso Co., Ltd.

Yoshihiro Okuda

Jun Yamada

Hisashi Iida

Noboru Takagi

Kiyoshi Nagata

Masaei Nozawa

Akito Onishi

Toshihiro Suzumura

Tomomi Eino

Shuji Sakakibara

Masanori Kurosawa

Takatoshi Morimitsu

Yoshitaka Hada

Hachirou Sasakura

Shiyogo Nakamura

A telescopic device includes an expandable tubular structure and an inner-side guide member disposed inside the tubular structure. The tubular structure includes an outer belt and an inner belt. The outer belt and the inner belt each have a plurality of first protrusions and holes arranged in a row in the longitudinal direction. The inner-side guide member has a first spiral groove extending along the plurality of first protrusions. When the inner-side guide member rotates in one direction, the outer belt and the inner belt are sent out, so that they are spirally wound while being engaged with each other, and the tubular structure extends. The first spiral groove has a body and an end portion extending from the body toward the root of the inner-side guide member. The distance between the end portion of the first spiral groove and the main part of the first spiral groove is small.

Telescopic device

It is determined whether an engine operating state is within a specified operating range. When the engine operating state is within the specified operating range, the air-fuel ratio of an i-th cylinder is estimated based on the detection value of the air-fuel ratio sensor, and a cylinder deviation, which is the deviation of an estimated air-fuel ratio from a reference air-fuel ratio, is computed. When this cylinder deviation becomes larger than a specified determination value, the processing of incrementing the count value of an abnormality counter is started at a point in time when a specified delay time elapses after the cylinder deviation becomes larger than the specified determination value. At a point in time when the count value of the abnormality counter becomes larger than a specified abnormality determination value, it is determined that the air-fuel ratio of the i-th cylinder is abnormal.

Cylinder abnormality diagnosis unit of internal combustion engine and controller of internal combustion engine

A fuel vapor treatment system includes a three-position valve for switching between a first measuring state and a second measuring state, and a pressure sensor for measuring pressure produced by a restriction in a measurement line. In the first measuring state, air flows through the measurement line. In the second measuring state, air-fuel mixture flows through the measurement line. The behavior of change in a first pressure in the first measuring state and the behavior of change in a second pressure in the second measuring state are measured. When that the behaviors of change in the first and second pressures are substantially identical to each other, it is determined that an abnormality occurs in an operation of switching the three-position valve.

Fuel vapor treatment system for internal combustion engine

A throttle full-closure detecting apparatus for judging the full-closure state of a throttle valve uses the minimum value of a throttle sensor voltage so that the apparatus output is compensated for, in particular, a change in temperature. In a timer routine in the apparatus, first, the throttle sensor output is AD-converted and the thus AD-converted output is stored into a RAM and a general purpose register Ar. Next, a full-closure angle is stored in a compare register Cr and the contents of Ar and Cr are compared with each other so that when Cr&gt;Ar, the AD-converted throttle value is stored as a full-closure angle and first storage updating is performed with the minimum throttle opening as the angle. Further, second updating for adding a specified value to the stored value of the full-closure angle is performed at a period sufficiently larger than the period of the time routine, and the first updating is made ready after the second updating.

Throttle full-closure detecting apparatus

An apparatus for detecting an abnormality of a fuel transpiration prevention system which includes a canister with an absorbing device and a control valve provided in a passage between a fuel tank and an intake pipe of an internal combustion engine so that a fuel gas generated within the fuel tank is absorbed by the absorbing device of the canister and introduced into the intake pipe by opening and closing the control valve in accordance with an operating state of said internal combustion engine. The apparatus includes a pressure detecting device for detecting a pressure within the fuel tank and a deviation calculating unit responsive to the output of the pressure detecting device for calculating a deviation between the pressure detected when the control valve opens the passage and the pressure detected when the control valve closes the passage. The apparatus decides an abnormality of the fuel gas supply system on the basis of the deviation calculated by the deviation calculating unit. This arrangement allows accurate abnormality detection throughout the fuel transpiration prevention system.

Abnormality detecting apparatus for use in fuel transpiration prevention

Growing community of inventors

Kariya, Japan

Yoshihiro Okuda