Nissan Motor Company Limited

Toru Fukami

Shinichi Takemura

Tsuyoshi Arinaga

Hiroyuki Nagai

Shunichi Aoyama

Satoshi Ogihara

Yasukimi Toda

Takanobu Sugiyama

Masashi Koshijima

Shinichirou Mizoguchi

Kentaro Kawahara

Yoshifumi Iribe

Shunishi Aoyama

An internal combustion engine control method controls an internal combustion engine equipped with an exhaust gas temperature variation factor unit that varies the temperature of an exhaust gas of the internal combustion engine, an exhaust heat recovery device disposed in an exhaust passage downstream of the exhaust gas temperature variation factor unit and that recovers the heat from the exhaust gas into a refrigerant that cools the internal combustion engine, and a refrigerant flow rate adjustment unit that adjusts a flow rate of the refrigerant that passes through the exhaust heat recovery device. The internal combustion engine control method estimates a boiling margin, which is a parameter related to a thermal margin when the refrigerant boils in the exhaust heat recovery device, and determines whether to execute a boiling avoidance process in accordance with the boiling margin.

Internal combustion engine control method and internal combustion engine control device

A cooling system controller controls a cooling system at least having a coolant pump () configured to supply a coolant to an internal combustion engine, a heat radiator () configured to cool the coolant, and an exhaust heat recovery system () configured to perform in heat exchange between the exhaust gas and the coolant. In addition, the cooling system controller () has a unit configured to control the coolant flow rate, a unit () configured to obtain a coolant temperature or pressure of the internal coolant passage of the engine, and a unit configured to obtain an internal coolant temperature or pressure of the exhaust heat recovery system. Furthermore, the coolant flow rate is restricted at a cold start of the internal combustion engine, and the restriction of the coolant flow rate is released on the basis of the coolant temperature or pressure of the engine coolant passage and the internal coolant temperature or pressure of the exhaust heat recovery system.

Cooling system controller and method of controlling cooling system

An exhaust heat recovering device comprising an exhaust heat recovering tool () adapted to recover a heat of an exhaust gas of an internal combustion engine for a vehicle and an inflow side pipeline () and an exhaust side pipeline () adapted to connect the internal combustion engine and the exhaust heat recovering tool, wherein the inflow side pipeline () and the exhaust side pipeline () are mounted only on a component included in a non-vehicle body vibration system supported on a vehicle body () through an elastic body ().

Exhaust heat recovering device

An engine exhaust apparatus includes an exhaust passage for flowing exhaust gas emitted from an engine, a flow rectifier for rectifying the flow of the exhaust gas, and an exhaust heat recovery unit disposed in the exhaust passage downstream of the flow rectifier. The exhaust heat recovery unit is provided with an exhaust heat recovery portion and a cooling portion to cool the exhaust heat recovery portion. The engine exhaust apparatus further includes a first diameter reducing portion gradually reduced in diameter toward the exhaust heat recovery unit from the flow rectifier, and a second diameter reducing portion gradually reduced in diameter toward the downstream from the exhaust heat recovery unit.

Engine exhaust apparatus

An exhaust device of an engine, with an exhaust path to lead exhaust gas discharged from the engine to outside, the exhaust device comprising: an exhaust heat collector being configured to collect heat from the exhaust gas, and a cooling part being configured to cool down the exhaust heat collecting part from an outer peripheral side via a cooling fluid; and an exhaust gas flow controlling member in a cylindrical shape, comprising an inlet part and an outlet part where the inflow of the exhaust gas is discharged to an upstream side of the exhaust heat collecting part. An opening diameter of the outlet part is arranged to be smaller than an outer diameter of the exhaust heat collecting part. The exhaust gas flow controlling member is placed so that an open end of the outlet part opposes a central portion of an upstream end plane of the exhaust heat collecting part. The open end of the outlet part and the upstream end plane of the exhaust heat collecting part are a predetermined distance apart.

Exhaust device of engine

While an operating angle or a lift of an engine valve () is modified within a predetermined operating angle range or lift range, variation in an opening timing of the engine valve () is suppressed by displacing a rocker shaft () relative to a drive shaft () such that an opening timing variation of the engine valve () accompanying angular variation in a straight line linking a center of the drive shaft () and a center of the rocker shaft () and an opening timing variation of the engine valve () accompanying variation in a distance between the center of the drive shaft () and the center of the rocker shaft () cancel each other out.

Variable valve device and internal combustion engine

A variable valve device includes: a drive shaft () that rotates in synchronization with a crankshaft of an engine; a drive cam () provided on the drive shaft (); a rocker cam () pivotally supported on the drive shaft (); an engine valve that is driven to open and close by the rocker cam (); a rocker shaft () disposed parallel to the drive shaft (); a rocker arm () pivotally supported on the rocker shaft (); a first link () that links the rocker arm () and the drive cam (); a second link () that links the rocker arm () and the rocker cam (); and a rocker shaft position modifying means () for modifying an operating angle and a lift of the engine valve by varying a position of the rocker shaft () relative to the drive shaft (), wherein the position of the rocker shaft () relative to the drive shaft () is modified such that within a predetermined operating angle range of the engine valve, a variation of a maximum lift of the engine valve accompanying control of the operating angle is suppressed in comparison with a case in which the operating angle is modified outside of the predetermined operating angle range.

Variable valve device

A variable valve system for an internal combustion engine includes a drive shaft, a drive cam provided on the drive shaft, a link arm fitted on the outer periphery of the drive cam such as to rotate relative to the drive cam, a crank-shaped control shaft including a main shaft and an eccentric cam, an oscillating arm rotatably attached to the eccentric cam and oscillated by the link arm, and an oscillating cam connected to the oscillating arm via a link rod so as to actuate a valve. Lubricant is communicated from a main lubricant flow path in the drive shaft through three lubricant paths to sliding contact areas between the drive cam and the link arm, between the pin of the oscillating arm and the link arm, and between the eccentric cam and the oscillating arm.

Variable valve system for internal combustion engine

A valve operating device that opens and closes a valve of an internal combustion engine by driving a valve stem in an axial direction includes a rocker cam that rocks in accordance with a rotation of a drive shaft and has a driving cam portion and a lift restricting cam portion; a cam follower that lifts the valve by contacting the driving cam portion slidingly; and a restricting member that prevents the cam follower from separating from the driving cam portion in cooperation with the lift restricting cam portion. A gap is formed between the restricting member and the rocker cam in a state where the cam follower is in contact with the driving cam portion and disappears such that the restricting member and the rocker cam come into contact with each other only when the cam follower separates from the driving cam portion.

Valve operating device for internal combustion engine

A valvetrain mechanism of an engine, including a drive shaft configured to rotate in synchronization with the engine, a link arm having a large end and a small end, the drive shaft being inserted into and passed through the large end, a valve lift control shaft disposed parallel to the drive shaft and having an eccentric portion, an oscillating arm disposed rotatably at the eccentric portion of the valve lift control shaft and interconnected with the small end of the link arm via a first rotation support point, a link rod interconnected with the oscillating arm via a second rotation support point positioned at a same side as the first rotation support point with respect to the valve lift control shaft, and an oscillating cam interconnected with the link rod via a third rotation support point and operated correspondingly with an operation of the drive shaft to thereby open a valve. A thickness of the small end of the link arm in a direction of the drive shaft is thinner than a thickness of the large end of the link arm in the direction of the drive shaft.

Growing community of inventors

Kanagawa, Japan

Toru Fukami