Abstract:
A method is provided for operating an engine assembly having a hydraulically actuated component. The method may include providing pressurized oil from a pressurized oil source to an oil passage in communication with the hydraulically actuated component and determining a first oil pressure measurement within the oil passage a first predetermined time after the providing. The method may further include preventing operation of the hydraulically actuated component when the first oil pressure measurement is below a first predetermined limit, isolating the oil passage from the pressurized oil source after the providing, and determining a second oil pressure measurement within the oil passage a second predetermined time after the isolating when the first oil pressure measurement is above the first predetermined limit. Operation of the hydraulically actuated component may be prevented when the second oil pressure measurement is above a second predetermined limit.
Abstract:
If a relative rotational phase between a first rotor drivably connected to a crankshaft and a second rotor drivably connected to a camshaft is not an intermediate lock phase when an engine is started, a fuel injection starting timing is delayed more than that of the time when the relative rotational phase is the intermediate lock phase. The delay time is determined according to the working oil temperature of a valve timing mechanism during the engine start or the same oil temperature at the previous stop time of the engine, for example. As a result, the start of the engine can be completed as soon as possible while retaining the startability of the internal combustion engine.
Abstract:
A fuel diluting quantity is estimated based on an alcohol concentration of the fuel. A response-deterioration determination value is corrected according to the estimated fuel diluting quantity. The response-deterioration determination value can be properly established even though the responsiveness of the variable valve timing controller is varied due to a variation in viscosity of the lubricant. Thereby, even when the responsiveness of the variable valve timing controller is varied (deteriorated) due to an increase in the fuel diluting quantity, it can be avoided that the computer determines that the variable valve timing controller has a defect.
Abstract:
The invention provides a control apparatus comprising a controller for determining a manipulated variable for manipulating a controlled object so that an output of the controlled object converges to a desired value and a modulator for modulating the manipulated variable by using one of a delta-sigma modulation algorithm, a sigma-delta modulation algorithm and a delta modulation algorithm to generate a modulated signal to be applied to the controlled object. The modulator generates the modulated signal so that a center value of an amplitude of the modulated signal follows a change of the manipulated variable. Thus, the modulated signal in which the manipulated variable is reflected without any loss can be generated even when the manipulated variable changes.
Abstract:
A valve opening/closing timing control apparatus and method can be used with a camshaft whose rotation is synchronized with opening/closing timing of an intake valve or an exhaust valve in an internal combustion engine; a relative rotation angle adjustment mechanism which transmits torque of a crankshaft in the internal combustion engine to the camshaft and which adjusts a relative rotation angle between the crankshaft and the camshaft; and a lock mechanism which depends on hydraulic fluid, and which mechanically locks or unlocks the relative rotation angle that is adjusted by the relative rotation angle adjustment mechanism. The apparatus and method determine the duration of a time period from a start of the internal combustion engine until a start of relative rotation angle adjustment, based upon an unlocking force of the hydraulic fluid that is applied to the lock mechanism when the lock mechanism is locked and the internal combustion engine is started.
Abstract:
A valve opening/closing timing control apparatus and method can be used with a camshaft whose rotation is synchronized with opening/closing timing of an intake valve or an exhaust valve in an internal combustion engine; a relative rotation angle adjustment mechanism which transmits torque of a crankshaft in the internal combustion engine to the camshaft and which adjusts a relative rotation angle between the crankshaft and the camshaft; and a lock mechanism which depends on hydraulic fluid, and which mechanically locks or unlocks the relative rotation angle that is adjusted by the relative rotation angle adjustment mechanism. The apparatus and method determine the duration of a time period from a start of the internal combustion engine until a start of relative rotation angle adjustment, based upon an unlocking force of the hydraulic fluid that is applied to the lock mechanism when the lock mechanism is locked and the internal combustion engine is started.
Abstract:
Described herein is a method for controlling a valve-control system (1) for variable-lift actuation of the valves (2) of a reciprocating internal-combustion engine, wherein the valve-control system (1) comprises, for each cylinder of said reciprocating internal-combustion engine, a solenoid valve (11) for controlling the flow of a hydraulic fluid in said valve-control system (11), and further comprises means configured for determining a real temperature value (T_OIL,AC, T_OIL,SV) of said hydraulic fluid. The method comprises the steps of: - determining a deviation of performance (CU_AVG_DEV%) of the solenoid valves (11) of said reciprocating internal-combustion engine due to a degradation of the characteristics of said hydraulic fluid with respect to nominal values thereof; and - substituting for said real temperature value (T_OIL,AC, T_OIL,SV) an equivalent temperature value (T_OIL,EQ, T_OIL,SV*) consisting of a temperature value at which the hydraulic fluid having nominal characteristics would produce performance of the solenoid valves (11) corresponding to the performance resulting from the aforesaid deviation so that each solenoid valve (11) is governed as a function of said equivalent temperature value (T_OIL,EQ, T_OIL,SV*) instead of as a function of the real temperature value (T_OIL,AC, T_OIL,SV) of the hydraulic fluid.
Abstract:
Die Erfindung betrifft ein Verfahren zur Nockenwellenverstellung in einer Brennkraftmaschine, wobei die Nockenwelle bzgl. einer Kurbelwelle mittels eines von einem Regler und einem Proportionalventil betätigten Verstellers um einen vorbestimmten Winkel verschwenkt wird, wobei der Regler einen Winkelsollwert mit einem Winkelistwert vergleicht, in Abhängigkeit von diesem Vergleich eine Stellgröße in Form eines Tastverhältnisses für das Proportionalventil bestimmt und bei Übereinstimmung von Winkelsoll- und Winkelistwert diese Stellgröße auf ein Haltetastverhältnis derart einstellt, daß der Winkelsollwert gehalten wird. Hierbei wird während einer Verstellung der Nockenwelle vor einem jeweiligen Soll-/Istwertvergleich dem Winkelistwert ein Prädiktionswinkel derart hinzuaddiert, daß die Summe aus Winkelistwert und Prädiktionswinkel einem Winkel der Nockenwelle entspricht, den diese nach Umstellen der Stellgröße auf den Haltewert bis zum vollständigen Schließen des Proportionalventils während einer Ventilschließzeit erreicht.