Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Keihin Corporation

Toshitaka Hachiro

Tomohiro Nishi

Manabu Niki

Masanobu Asakawa

Sachito Fujimoto

Kohei Hanada

Kojiro Tsutsumi

Asao Ukai

Takahiro Yonekura

Shusuke Akazaki

Yuji Yamamoto

Minoru Suzuki

Teruo Wakashiro

Fumio Hara

Kazuhiko Kitano

Ryuji Sato

Yuji Fujiki

Gaku Sato

Shigeto Kashiwabara

Hiroshi Kawaguchi

An in-cylinder pressure detecting device of a direct injection type internal combustion engine is provided in which a ring-shaped pressure detection element () surrounding a fuel injection hole () is provided in the vicinity of an extremity of an injector () that injects fuel into a combustion chamber. Since the pressure detection element is provided on the injector, not only is it unnecessary to change the shape or structure of the cylinder head or the combustion chamber in order to provide the pressure detection element, but it is also possible to cool the pressure detection element () by fuel passing through the inside of the injector to thus enhance the precision of pressure detection and the durability. Further, since the ring-shaped pressure detection element () surrounds the periphery of the fuel injection hole (), it is possible to maximize the dimensions of the pressure detection element () to thus further enhance the precision of pressure detection while avoiding interference between the pressure detection element () and fuel injected via the fuel injection hole ().

In-cylinder pressure detecting device of direct injection type internal combustion engine

In a fuel pump control system for an internal combustion engine whose operation is switched between cut-off-cylinder operating mode during which some of the cylinders are non-operative and full-cylinder operating mode during which all of the cylinders are operative and having a fuel injector connected to the fuel supply line and supplied with fuel pressurized by the fuel pump, it is discriminated whether the operation of the engine is in the full-cylinder operating mode or in the cut-off-cylinder operating mode, the operation of the fuel pump is controlled based on the discriminated operating mode of the engine, i.e., is controlled such that the delivery flow rate of the fuel pump when the engine is discriminated to be in the cut-off-cylinder operating mode, is reduced relative to that when the engine is discriminated to be in the full-cylinder operating mode, thereby reducing the power consumption and operating noise of the fuel pump.

Fuel pump control system for cylinder cut-off internal combustion engine

A control system for a variable-cylinder internal combustion engine, which is capable of attaining excellent fuel economy by executing a partial-cylinder operation mode as long as possible, while suppressing vibration and noise during the partial-cylinder operation mode. A control system switches the operation mode of a variable-cylinder internal combustion engine between an all-cylinder operation mode in which all of a plurality of cylinders (#to #and #to #) are put in operation, and a partial-cylinder operation mode in which some (#to #) of the plurality of cylinders are deactivated. During the partial-cylinder operation mode, the control systemcalculates a degree-of-continuation parameter SDTQCSNH indicative of a degree of continuation of a state where detected load TQECMDF on the engine is within a predetermined range of load between a first reference value TQCSNH and a second reference value TQCSEH smaller than the first reference value (stepsto), and determines whether or not the operation mode should be switched to the all-cylinder operation mode, based on the degree-of-continuation parameter SDTQCSNH (step).

Control system for variable-cylinder internal combustion engine

A motor charge-discharge torque limit correction coefficient for during cylinder deactivation enlargement assistance, which changes with an increasing trend according to an increase in a regeneration/assistance integrated residual amount which is an integrated value of the energy amount obtained during deceleration regeneration of vehicle, that is a correction coefficient which corrects to decrease an energy management discharge torque limit which is an upper limit value of motor torque set according to for example, an energy state in high voltage electrical equipment and an operating state of the vehicle, when assisting the output from the internal-combustion engine by the motor, is calculated. A value obtained by correcting the energy management discharge torque limit is set to an energy management discharge torque limit for cylinder deactivation enlargement assistance, and a cylinder deactivation upper limit ENG torque is added so as to calculate a cylinder deactivation upper limit torque.

Control apparatus for hybrid vehicle

An object is to improve fuel consumption efficiency while maintaining a desired driving force. Accordingly, in a case where an assisting possibility of a motor M is increased accompanying a relatively high state of charge SOC of a battery (YES side in step S), and moreover in a case where a required torque TQAPCC is less than a predetermined value (NO side in step Sor YES side in step S), a '1' is set to a flag value of an LC_ON assistance flag F_LCOAST, and in a region for an accelerator pedal opening AP, and a vehicle speed VP, a region which maintains an LC_ON state where a lock-up clutchis in an engaged state is enlarged compared to for a normal state where the flag value of the LC_ON assistance flag F_LCOAST is '0'. In the LC_ON region enlarging state, it is determined whether or not it is possible to shift to the normal state, according to the state of charge SOC and the required torque TQAPCC (step Sto step S).

An air-fuel ratio sensor deterioration-detecting system is provided for an internal combustion engine having first and second air-fuel ratio sensors arranged in the exhaust system upstream and downstream of a catalytic converter therein. An ECU calculates a control parameter, based on an output from the second air-fuel ratio sensor, calculates an air-fuel ratio correction amount, based on an output from the first air-fuel ratio sensor and the calculated control parameter, and executes air-fuel ratio feedback control, based on the calculated air-fuel ratio correction amount. The ECU also determines deterioration of the second air-fuel ratio sensor, based on the output from the same in such a manner that the air-fuel ratio correction amount is increased or decreased by a predetermined amount, based on the output from the second air-fuel ratio when a variation in the second air-fuel ratio sensor output falls within a predetermined small variation range during execution of the air-fuel ratio feedback control, and the second air-fuel ratio sensor is determined to be deteriorated when the output variation falls within the predetermined small variation range even after the increase or decrease of the air-fuel ratio correction amount.

Air-fuel ratio sensor deterioration-detecting system for internal

An air-fuel ratio sensor deterioration-detecting system for an internal combustion engine includes a catalytic converter arranged in the exhaust system, first and second air-fuel ratio sensors arranged in the exhaust system at respective locations upstream and downstream of the catalytic converter, and an ECU which calculates a value of a first control parameter, based on an output from the second air-fuel ratio sensor, and executes air-fuel ratio feedback control, based on the calculated value of the first control parameter. A value of a second control parameter to be used for calculating the value of the first control parameter is calculated based on the output from the second air-fuel ratio sensor. Whether the second air-fuel ratio sensor is deteriorated is determined based on the output from the second air-fuel ratio sensor. A value of at least one of the first and second control parameters is increased when a variation in the output from the second air-fuel ratio sensor is small during execution of the air-fuel ratio feedback control, and it is determined that the second air-fuel ratio sensor is deteriorated when the variation in the output from the second air-fuel ratio sensor is continuously small over a predetermined time period after the value of the at least one of the first and second control parameters has been increased.

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Wako, Japan

Toshitaka Hachiro