Mazda Motor Corporation

Toyo Kogyo Co., Ltd.

Toshimichi Akagi

Haruo Okimoto

Seiji Tashima

Tomoo Tadokoro

Yasushi Niwa

Kouichi Hatamura

Hidesaku Ebesu

Naoki Nagano

Masami Nakao

Makoto Kishida

Nobuhiro Hayama

Masanori Shibata

Yukio Arakawa

Ikuo Matsuda

Hideo Shiraishi

Einosuke Suekuni

Masaaki Sato

Masaru Yamamoto

Masashi Ohmori

Nariyasu Oki

Kaoru Yamada

Ritsuharu Shimizu

Naoyuki Matsumoto

Takayoshi Hashimoto

An air intake device for introducing air into an engine includes an intake duct, part of which is disposed in a space defined by a front wheel apron forming an inner wall of an engine compartment, and a front fender for forming an outer wall of a vehicle body. A hole is formed in the wheel apron for providing an opening through which an upstream portion of the intake duct passes so as to have its intake opening open into the engine compartment.

Air intake device for automotive engine

An intake system includes a supercharger for use with a power train. The power train includes a transverse engine and a transmission disposed transversely behind the engine. The engine has first and second rows of cylinders. Cylinders in each row are intended not to be fired one after another. The first and second rows of cylinders are offset sideways relative to each other. The intake system has an individual downstream intake part, downstream from the supercharger supported by the power train, for each row of cylinders. The individual downstream intake port includes a branch intake passage, branching off downstream from the supercharger and supported by the power train, and an inter-cooler disposed in the branch intake passage. One of the inter-coolers is located on a front side of the engine, and another of the inter-coolers is located above the transmission.

Intake system for an internal combustion engine with a supercharger

An engine cooling apparatus capable of assuring an adequate air-water separating function in an arrangement wherein an air-water separating tank having a pressure valve is provided at a point along a coolant passageway. The apparatus has a closed circulating system constructed from an engine, a radiator and a coolant passageway connecting the engine and radiator, wherein, a coolant for cooling the engine is made to circulate in the closed circulating system from upstream to downstream, and air which mixes with the coolant is discharged outside the closed circulating system. The apparatus includes a branch passageway which branches off from a first intermediate portion of the coolant passageway and merges with the coolant passageway at a second intermediate portion thereof that is downstream of the first intermediate portion, and an air-water separating tank arranged in an intermediate portion of the branch passageway and having a pressure valve which opens to the atmosphere at a prescribed pressure in order to discharge the air to the outside of the closed circulating system.

Engine cooling apparatus

A V-type engine is constructed so that one bank of cylinders is located rearward, in a longitudinal direction of the engine, relative to the other bank of cylinders so that a space is formed in front of a front surface of a cylinder block of the engine. In the space, a casing or casings for a fluid passage are provided. Supplemental apparatuses, such as a water pump, an alternator, a compressor, and an oil pump, are formed so as to be driven by belts transmitting drive power from a crankshaft of the V-type engine. One of the belts has tension applied to it by a tensioner, which is formed on a bracket. The bracket is fixed to the casing or casings by bolts, which are used for both fixing the casing or casings to the cylinder block and for fixing the bracket to the casing or casings. As a result, both of the bracket and the casing or casings are firmly fixed to the cylinder block within a compact space, even when the tensioner is located far from the front surface of the cylinder block.

Arrangement for driving at least one supplemental apparatus of a V-type

An air and fuel supply control system for an internal combustion engine comprises a plurality of superchargers including a turbosupercharger, an intake air cutoff valve operative selectively to be open and closed respectively for opening and closing one of separated intake passages in which a compressor of the turbosupercharger is disposed, an intake air relief valve operative selectively to be open and closed respectively for opening and closing a relief passage provided for detouring the compressor of the second supercharger, a cutoff valve controller operative to control the intake air cutoff valve to be closed so that the turbosupercharger is restrained from supercharging the engine and to be open so that the turbosupercharger works for supercharging the engine, a relief valve controller operative to control the intake air relief valve to be closed before the intake air cutoff valve is opened and to be open after the intake air cutoff valve is closed, an air flow sensor for detecting intake air mass flow passing through an intake passage from which the separated intake passages are branched, a fuel supply controller operative to control quantity of fuel supplied to the engine in accordance with a detection output obtained from the air flow sensor, and a fuel supply revising device operative to revise the quantity of fuel supplied to the engine when the intake air relief valve is caused to be open and closed selectively.

Air and fuel supply control systems for internal combustion engines

An air and fuel supply control system for an internal combustion engine comprises a plurality of superchargers including a turbosupercharger, an intake air cutoff valve operative selectively to be open and closed respectively for opening and closing one of separated intake passages in which a compressor of the turbosupercharger is disposed, a cutoff valve controller operative to control the intake air cutoff valve to be closed so that the turbosupercharger is restrained from supercharging the engine when intake air mass flow fed to the engine is to be relatively small and to control the intake air cutoff valve to be open so that the turbosupercharger works for supercharging the engine when the intake air mass flow fed to the engine is to be relatively large, and air flow sensor for detecting intake air mass flow passing through an intake passage from which the separated intake passages are branched, a fuel supply controller operative to control quantity of fuel supplied to the engine in accordance with a detection output obtained from the air flow sensor, and a fuel supply revising device operative to revise the quantity of fuel supplied to the engine when the intake air cutoff valve is caused to be open and closed selectively.

An air supply control system for an internal combustion engine comprises first and second turbosuperchargers, an exhaust cutoff valve operative to open and close one of separated exhaust passages in which a turbine of the second turbosupercharger is disposed, a first valve driving device for controlling the exhaust cutoff valve so that only the first turbosupercharger works when intake air mass flow fed to the engine is to be relatively small and both of the first and second turbosuperchargers work when the intake air mass flow is to be relatively large, an exhaust bypass valve operative to open and close an exhaust bypass passage provided for forming a partial exhaust passage detouring the exhaust cutoff valve, a second valve driving device for causing the exhaust bypass valve to open the exhaust bypass passage when intake air pressure applied to the engine reaches a predetermined value under a condition in which the intake air mass flow is to be relatively small, a waste gate valve operative to open and close a bypass passage provided for forming a partial exhaust passage detouring the turbines of the first and second turbosuperchargers, and a third valve driving device for causing the waste gate valve to open the bypass passage when the pressure of intake air reaches substantially the predetermined value under a condition in which the intake air mass flow is to be relatively large.

Air supply control systems for internal combustion engines

An air supply control system for an internal combustion engine includes a plurality of superchargers including a turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the turbosupercharger is disposed, and an intake air cutoff valve operative selectively to open and close an intake passage in which a blower of the turbosupercharger is disposed, wherein both the exhaust cutoff valve and the intake air cutoff valve are closed when intake air mass flow fed to the engine is to be relatively small and are open when the intake air mass flow is to be relatively large, the intake air cutoff valve is delayed to be open compared with the exhaust cutoff valve when the operating condition of the engine is changed into the situation in which the intake air mass flow is to be relatively large from the situation in which the intake air mass flow is to be relatively small, and the intake air cutoff valve is delayed to be closed compared with the exhaust cutoff valve when the operating condition of the engine is changed into the situation in which the intake air mass flow is to be relatively small from the situation in which the intake air mass flow is to be relatively large.

Air supply control systems for turbocharged internal combustion engines

An air supply control system for an internal combustion engine comprises a plurality of superchargers including a turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the turbosupercharger is disposed, an intake air cutoff valve operative selectively to open and close an intake passage in which a blower of the turbosupercharger is disposed, an intake air relief valve operative selectively to open and close a relief passage provided for detouring the blower of the turbosupercharger, an engine operation detector for detecting operating conditions of the engine, a cutoff valve controller operative, in response to the detection output from the engine operation detector, to cause both the exhaust cutoff valve and the intake air cutoff valve to be closed when intake air mass flow fed to the engine is to be relatively small and to cause both the exhaust cutoff valve and the intake air cutoff valve to be open when the intake air mass flow fed to the engine is to be relatively large, and a relief valve controller operative, in response to the detection output from the engine operation detector, to cause the intake air relief valve to be closed at a time point earlier than another time point at which the exhaust cutoff valve is fully opened.

An air supply and exhaust control system for an internal combustion engine comprises at least first and second turbosuperchargers, an operation prohibiting portion for prohibiting the second turbosupercharger from working as occasion demands, an exhaust gas flow detecting portion, an air supply control portion for causing the operation prohibiting portion to prohibit the second turbosupercharger from working when a detection output from the exhaust gas flow detecting portion indicates that the exhaust gas flow is less than a first predetermined value, an exhaust gas discharging device connected to an exhaust passage in possession of variable exhaust resistance for discharging the exhaust gas, an exhaust resistance changing portion for changing the variable exhaust resistance, and an exhaust control portion for controlling the exhaust resistance changing portion to set the variable exhaust resistance to be relatively small when the detection output from the exhaust gas flow detecting portion indicates that the exhaust gas flow is more than a second predetermined value which is smaller than the first predetermined value and to be relatively large when the detection output from the exhaust gas flow detecting portion indicates that the exhaust gas flow is equal to or less than the second predetermined value.

Air supply and exhaust control systems for turbocharged internal

An internal combustion engine comprises a primary supercharger operated in substantially a full range of engine operating conditions of a vehicle and a secondary supercharger operated in a specific range of the engine operating condition. The plurality of supercharger are arranged in parallel in the fore and aft direction of a vehicle in a manner such that the primary supercharger means is disposed forward of the secondary supercharger. The primary supercharger is disposed at a front portion of an engine room, just behind a cooling fan, to easily be provided with a cooling effect by virtue of a fresh air. The secondary supercharger is disposed rearward of the primary supercharger to avoid the cooling effect provided by the fresh air and to receive air warmed by the primary supercharger so to undergo a warming up effect.

Internal combustion engine with turbo supercharger

An air supply control system for an internal combustion engine comprises at least first and second turbosupercharger, an exhaust cutoff valve operative selectively to open and close an exhaust passage in which a turbine of the second turbosupercharger is disposed, an intake air cutoff valve operative selectively to open and close an intake passage in which a blower of the second turbosupercharger is disposed, a cutoff valve controller operative to control the exhaust cutoff valve and the intake air cutoff valve so as to cause the first turbosupercharger to work when intake air mass flow fed to the engine is to be relatively small and to cause both of the first and second turbosuperchargers to work when intake air mass flow fed to the engine is to be relatively large, an engine operation detector, and an operation controller operative to vary, in response to an engine operating condition detected by the engine operation detector, a boundary between first and second operating areas provided on an operating characteristic chart of the engine respectively for a first supercharging operation in which the first turbosupercharger works but the second turbosupercharger does not work and a second supercharging operation in which both of the first and second turbosuperchargers work.

Disclosed is an engine-control apparatus in which an exhaust passageway of the engine is provided with plural sound deadening passages. A portion of the plural sound deadening passages is designed to be opened or closed by a shift valve on the basis of a predetermined switching characteristic, and the pressure of the exhaust gases is changed upon the switching of the shift valve. In order to prevent torque shock to the driven wheels which may occur attendant upon operation of the shift valve to open or close or in order to reduce probability that torque shock would occur, there is provided a torque regulating apparatus which permits an adjustment of torque generator by the engine, of a transmission efficiency of power to the driven wheel, or of a switching speed at which the shift valve is switched to open or close, or a change in the switching characteristic.

Engine-control apparatus

In a supercharged engine, a part of the pressurized air pressurized by a supercharger is introduced into the exhaust system as secondary air in a predetermined operating range of the engine. The supercharging pressure is controlled to be lower when introduction of secondary air is effected than when it is not effected.

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Hiroshima, Japan

Toshimichi Akagi