摘要:
An intake valve control apparatus for an internal combustion engine includes a first variable valve operating mechanism (5) capable of varying an operation angle of an intake valve (3) continuously, a second variable valve operating mechanism (6) capable of varying a maximum lift phase of the intake valve (3) continuously, and a controller (10) that controls an intake air amount mainly by varying the operation angle and the maximum lift phase of the intake valve. The controller is configured to, when one of the first and second variable valve operating mechanisms (5, 6) is at a phase position different from a predetermined start stage phase position at engine start, correct a phase position of the other of the first and second variable valve operating mechanisms (5, 6) in accordance with a present phase position of the one of the first and second variable valve operating mechanisms (5, 6). An intake valve control method is also provided.
摘要:
A control system for an internal combustion engine is provided. The engine includes a compression ratio control mechanism (102) and an ignition timing control system (103). The control system comprises an engine control unit (33) for controlling the compression ratio control mechanism (102) and the ignition timing control system (103) so that when the engine is cold, the ignition timing is retarded largely from an MBT point and the compression ratio ( E ) is set higher than that obtained when the engine is cold and operated at corresponding engine rpm and engine load. A method for controlling such an internal combustion engine is also provided.
摘要:
A variable valve train device (110) is mounted on the engine head and is pivotable about the camshaft to alter the timing and lift of a intake valve. A command link (122) controls the rotational position of the apparatus with respect to the camshaft and is rotationally supported by a cylindrical shell bearing (126) mounted on the engine head coaxial with the camshaft. The shell bearing is supported by an hydraulic lash adjuster (128) or an adjustable ball joint to minimize mechanical lash in the device. The command link includes a ring gear (123) which meshes with a control shaft gear (28) for advancing or retarding the valve timing. The command link pivotably supports a rocker assembly (132) for following the rotary motion of the valve-opening and valve-closing cam lobes. The rocker assembly is linked to an output cam (140) disposed between the camshaft and a roller finger follower for actuating the valve.
摘要:
There is provided a valve timing control system for an internal combustion engine, which makes it possible to secure a right amount of combustion gases in a combustion chamber, irrespective of whether an EGR device is in operation or not, thereby obtaining a sufficient effect of reduced exhaust emissions by reduction of NOx. A crank angle position sensor and an intake pipe absolute pressure sensor detect operating conditions of the engine. An ECU determines whether the EGR device is in operation or not. A target cam phase is set in dependence on the detected operating conditions of the engine and a result of the determination as to whether the EGR device is in operation or not, and the cam phase is controlled to the target cam phase.
摘要:
A control system of an internal combustion engine is comprised of an operation angle adjustment mechanism (10) which continuously varies an operation angle of intake valves of the engine, an air-fuel ratio detector (56, 58) which detects an exhaust parameter indicative of air-fuel ratio information, and a control unit (50) which are coupled to the operation angle adjustment mechanism and the air-fuel ratio detector. The control unit feedback-controls an air-fuel ratio of the engine on the basis of the exhaust parameter and corrects the operation angle on the basis of the exhaust parameter.
摘要:
In an internal combustion engine employing a variable lift and working angle control mechanism (1) and a variable phase control mechanism (21), a first sensor (14) is provided to detect an actual control state of the variable lift and working angle control mechanism every sampling time intervals. Also provided is a second sensor (16) that detects an actual control state of the variable phase control mechanism every sampling time intervals. At least one of the sampling time interval for the first sensor and the sampling time interval for the second sensor has a characteristic that the one sampling time interval varies relative to the engine speed. A rate of change in the sampling time interval for the first sensor with respect to the engine speed is different from a rate of change in the sampling time interval for the second sensor with respect to the engine speed.
摘要:
In a variable valve event and lift mechanism that rotates a control shaft (16) by a motor to successively vary a valve event and a valve lift amount of engine valves (12), a VEL control unit integrally provided with an angle sensor (104) that detects a rotation angle of the control shaft, is disposed and a signal of a target rotation angle of the control shaft is output to the VEL control unit from an engine control unit, so that the VEL control unit feedback controls the motor.
摘要:
A controlled variable and a target in each of a variable valve event and lift control apparatus and a variable valve timing control apparatus are input, to calculate target opening timing of an intake valve corresponding to the target and also to calculate actual opening timing of the intake valve corresponding to the controlled variable, to correct ignition timing based on a deviation between the target opening timing and the actual opening timing.
摘要:
A VVA apparatus for an internal combustion engine includes a intake valve, and an alteration mechanism which variably controlling lift characteristics of the intake valve in accordance with the engine operating conditions, wherein the valve lift characteristics include a ramp period which is shorter in the range of medium lift amount than in the range of small lift amount and the range of large lift amount.