摘要:
An engine is provided with two spark plugs in each combustion chamber to ignite stoichiometric air-fuel mixture mixed with a large proportion of inert gases to lower NOx emission level. The engine is equipped with hydraulic valve lifters which are mechanically connected to intake and exhaust valves to control the valve overlap of the intake and exhaust valves. By the action of the valve lifters, the valve overlaps are increased in the normal driving operation range of the engine to prevent discharge at the terminal stage of exhaust valve opening exhaust gases containing a considerably large amount of hydrocarbons.
摘要:
A centralized control system for coordinating a plurality of vehicular air-pollution preventive devices in such a manner as to minimize the harmful contents of the automotive exhaust gases. In a preferred embodiment, the system includes six air-pollution preventive devices; an ignition timing retarding device, an exhaust gas after-burning device, a fuel vapor trapping device, an exhaust gas recirculating device, an atmospheric air introducing device and a device for reducing hydrocarbon exhaust during deceleration. The system also includes five sensors; a vehicle speed sensor, an intake manifold vacuum sensor, a throttle opening sensor, an engine temperature sensor and an exhaust temperature sensor, and a controller adapted to determine the individual predetermined conditions of engine operation during which the air-pollution preventive devices are placed in operation, in accordance with electric signals supplied thereto from these sensors. The controller, upon determination of such conditions, operates to keep the devices operative.
摘要:
An air gallery connected to an air pump is formed in the cylinder head of an internal combustion engine. A bore is also formed in the cylinder head to communicate the air gallery with the exhaust port of the engine. Within the bore an air injection nozzle is securely inserted and projected through the wall surface of the exhaust port near the longitudinal axis of the exhaust port.
摘要:
Exhaust gases, which are slightly cooler than normal due to NOx suppressing ignition of the charge containing a large amount of recirculated gas by dual spark plugs, are exhausted via a large diameter exhaust valve to reduce the time for which they exceed the speed of sound and transfer heat to the cylinder head to maintain a high CO and HC oxidizing temperature. The exhaust valve is diametrically opposed to the inlet valve and has a cross sectional area of 19 to 24% of the cylinder bore.
摘要:
Each combustion chamber of an internal combustion engine is divided into four generally equal imaginary parts by a longitudinal vertical imaginary plane parallel with the longitudinal axis of the cylinder head of the engine and a lateral vertical imaginary plane perpendicular to the longitudinal vertical imaginary plane. Two spark plugs, and intake and exhaust valves are disposed on the cylinder head wall surface defining the upper part of the combustion chamber, and located at the four generally equal imaginary parts, respectively.
摘要:
A linkage for pulling a valve stem against resistance of a compression spring comprises three link members; a first link member coaxially fixed to and extending from the stem, a second member pivoted at an end to the extending end of the first member and a third link member pivoted at an end to the second member at an intermediate point of the second member and pivotally mounted on a fixed shaft at the other end. An actuator exerts a constant force on the free end of the second link and rotates the second link about both the pivots for the first and third links, resulting in pulling the valve stem with a progressively increasing force.
摘要:
A spark plug is located in a combustion chamber so as to decrease the combustion time of the charge inducted into the combustion chamber. The charge is formed, before inducted into the combustion chamber, by mixing an air-fuel mixture and substantially inert gas such as exhaust gas so that the weight ratio of the fuel combusted in the combustion chamber and the substantially inert gas falls within the range from 1:13.5 to 1:18.5 during normal engine operation.
摘要:
An exhaust gas recirculation system comprises an exhaust gas flow control valve; a vacuum actuator for operation of the flow control valve; and a control apparatus constructed and arranged such that an output vacuum of the control apparatus applied to the vacuum actuator is an amplification of the venturi vacuum modified by the intake manifold vacuum.
摘要:
Flow of secondary air into the exhaust system is regulated by diaphragm assembly controlled valves between an air supply and the exhaust system. The diaphragm assemblies respond to vacuum in the intake air system of the engine.