A gas concentration detector prevents deviation in output due to a difference in oxygen reactivity between electrode materials to accurately detect a specific gas component in a gas to be measured, such as NOx in an exhaust gas. A sensor element in an NOx sensor has a pump cell in a first chamber and a sensor cell for decomposing NOx and any remaining oxygen and a monitor cell for decomposing only remaining oxygen in a second chamber. An NOx concentration is detected based on a difference in current output between the sensor cell and the monitor cell. Since the sensor cell and the monitor cell have different oxygen reactivities, an output of the monitor cell is smoothed through a band-pass filter or the like so that output responses of the sensor cell and the monitor cell are made to substantially match each other, thereby eliminating any deviation in output.

Gas concentration detector

A valve opening/closing timing controller capable of suppressing the entry of foreign matter into the sliding parts of a lock member by suppressing the deposition of foreign matter in an engagement recessed part and having a lock mechanism capable of reducing the sliding resistance of the lock member. The lock mechanism (5) comprises a sliding groove (52) formed in an outer rotor (2), the lock member (53) slidable along the sliding groove (52), and the engagement recessed part (51) formed in an inner rotor (3), formed so that the lock member (53) can be engaged therewith in the locked state of a relative rotation phase, and having an inflow port (58) allowing a working fluid to flow therein. A working fluid flow passage (57) formed along the sliding direction of the lock member (53) and communicating with the engagement recessed part (51) is formed in at least one of the sliding groove (52) and the lock member (53).

Valve opening/closing timing controller

Provided is a control device for an internal-combustion engine provided with a throttle valve installed in an intake path. A full intake air amount, which is the intake air amount corresponding to when the throttle valve is fully open, is calculated in accordance with engine revolution speed, and a theoretical intake air amount, which corresponds to when engine exhaust gas does not recirculate to a combustion chamber, is calculated in accordance with the full intake air amount and an intake pressure. An actual intake air amount of the engine is detected or estimated, and an exhaust gas recirculation rate is calculated using the theoretical intake air amount and the actual intake air amount. The engine is controlled using the calculated exhaust gas recirculation rate.

Control device for internal combustion engine

The differential limiting control apparatus having a clutch unit interposed between one rotational shaft and the other rotational shaft for variably transmitting a driving force between the one rotational shaft and the other rotational shaft, having: a feedback control unit for computing the clutch torque on basis of vehicle behaviors through a feedback control, a feed forward control unit for computing the clutch torque based on the behaviors through feed forward control, a tire diameter difference computing unit for computing a diameter difference of a tire, and a clutch torque computing unit for computing a final clutch torque by changing a ratio of the clutch torque obtained through the feedback control and a clutch torque obtained through the feed forward control so as to appropriately decide the feed forward control by effectively suppressing the tire slip while avoiding the occurrence of the internal circulation of the torque.

Differential limiting control apparatus for a vehicle and the method thereof

A fuel injector (5) injects fuel to generate an air-fuel mixture that is burnt in the engine (1), and a sensor (16) detects an air-fuel ratio of the air-fuel mixture from an exhaust gas composition of the engine (1). A controller (11) calculates a dead time representing a lag between the air-fuel ratio variation of the air-fuel mixture and the air-fuel ratio variation detected by the sensor (16), and calculates an estimated state quantity by applying a dead time compensation according to Smith method and a disturbance compensation to the air-fuel ratio detected by the sensor (16). By determining an air-fuel ratio feedback correction amount based on the estimated state quantity applying a sliding mode control process, the response and stability of air-fuel ratio control is improved.

Engine air-fuel ratio control

PURPOSE: To provide leanness of air-fuel ratio to a maximum limit in a surge limit by calculating a rotation or torque fluctuation amount and its mean value in an internal combustion engine, and providing the leanness of the air-fuel ratio of a mixture sucked into the internal combustion engine, in a range of this mean value not exceeding a reference level. CONSTITUTION: A fluctuation amount of rotation or torque of an internal combustion engine is calculated by a fluctuation amount calculating means A. A mean value in a predetermined period in an absolute value of the calculated fluctuation amount is calculated by a fluctuation mean value calculating means B. Further, the calculated mean value is compared with a reference level by a comparing means C. In a range of the mean value not exceeding the reference level, air-fuel ratio of a mixture sucked into the internal combustion engine is controlled so as to change lean by an air-fuel ratio control means D. That is, a lean limit changed by an environmental condition is detected, to perform air-fuel ratio control of promoting leanness as much as possible while suppressing a surge to a permissible level. In this way, exhaust purifying performance and operation performance are improved. COPYRIGHT: (C)1993,JPO&Japio

Air-fuel ratio control device for internal combustion engine

PROBLEM TO BE SOLVED: To improve the control performance of a valve timing control device for an internal combustion engine or the like. SOLUTION: In the valve timing control device performing a feedback-control by a sliding mode control, a switching function S is set as a function of deviation between a target angle and an actual angle (S1), and the value of gain K of a nonlinear item is switched and set according to the positive and negative codes of the switching function S (S2 to S5). Further, the value of gain (c) of a linear item is switched and set according to the positive and negative codes of the deviation (S6 to S9), and then a feedback control amount is calculated by adding the nonlinear item to the linear item (S10). COPYRIGHT: (C)2002,JPO

Sliding mode control device

PROBLEM TO BE SOLVED: To accurately correct a variation in characteristics in an engine having a variable valve train capable of varying the center phase of the operating angle and the lift characteristics of an intake valve. SOLUTION: In a V-type engine having a variable valve timing mechanism and a variable lift mechanism of the intake valve, a difference in torque between banks is provided, and a valve timing for the intake valve by the variable valve timing mechanism is learned to reduce the difference in torque in an area where the opening area of the intake valve is larger than a threshold. After the learning is completed, the lift characteristics of the intake valve by the variable lift mechanism are learned to reduce the difference in the torque in an area where the opening area is smaller than a threshold. COPYRIGHT: (C)2007,JPO&INPIT

Controller of variable valve train

PROBLEM TO BE SOLVED: To avoid the occurrence of engine stalling even if the valve lift amount of an intake valve is stuck on a low lift side due to the failure of a variable valve train. SOLUTION: When the variable valve train fails, an air amount control is switched to one by a throttle valve. Also, when the intake valve is stuck on a low valve lift side due to the failure, a target idle rotating speed is increased for correction, and the valve timing of the intake valve by the variable valve timing mechanism is fixed to the most retard-angle position. In addition, when the engine rotational speed does not reach the target idle rotational speed corrected by increasing the speed, an auxiliary equipment load such as a compressor for air conditioner is forcibly stopped. COPYRIGHT: (C)2005,JPO&NCIPI

Lift amount variable controller of internal combustion engine

PROBLEM TO BE SOLVED: To prepare a water dispersion which can be easily dispersed in water, is excellent in water resistance of its coating film, strength at a breaking point, solvent resistance, chemical resistance, and adhesion properties to a polylactic acid substrate, can easily coat and impregnate, and is good in stability and biodegradability, and to provide a finely divided particle of a polylactic acid obtained by drying and to prepare a coating film having excellent smoothness. SOLUTION: The water dispersion of a polylactic acid-polyethylene glycol block copolymer is an A-B-A terblock copolymer comprising polylactic acid (A) and polyethylene glycol (B). COPYRIGHT: (C)2005,JPO&NCIPI

秀和吉澤

Papers

Air-fuel ratio control device for internal combustion engine

Sliding mode control device

Controller of variable valve train

Lift amount variable controller of internal combustion engine

Water dispersion of polylactic acid-polyethylene glycol block copolymer, particles of the copolymer, and coated film formed from them

秀和 吉澤

Papers

Air-fuel ratio control device for internal combustion engine

Sliding mode control device

Controller of variable valve train

Lift amount variable controller of internal combustion engine

Water dispersion of polylactic acid-polyethylene glycol block copolymer, particles of the copolymer, and coated film formed from them

秀和吉澤