11 results about "Variable valve timing" patented technology

A valve timing control device includes: a unit for calculating a target valve timing for one of an intake valve and an exhaust valve in accordance with an operational state; a unit for detecting an actual valve timing of one of the intake valve and the exhaust valve; an actual valve timing control unit for generating a controlled variable for the VVT based on a difference between the target valve timing and the actual valve timing; a unit for learning a learning value of the controlled variable required for maintenance of the actual valve timing based on an integral correction value; and a unit for detecting a malfunction in a VVT from an amount of a shift in the actual valve timing when learning is not completed yet, and for detecting a malfunction in the VVT from the difference when learning is already completed.

The application discloses a variable timing valve opening degree measurement method, device, storage medium and vehicle, and relates to the technical field of variable valve timing control, and can be used for measuring the opening degree of a variable timing valve. The method comprises the following steps: acquiring a camshaft signal wheel duty cycle signal of a camshaft signal wheel, and determining base tooth position information of the camshaft signal wheel according to the camshaft signal wheel duty cycle signal; acquiring crankshaft signal wheel sensor measurement information of a crankshaft signal wheel, and determining flag tooth position information of the crankshaft signal wheel according to the crankshaft signal wheel sensor measurement information; and determining the real-time opening degree of the variable timing valve according to the base tooth position information, the flag tooth position information and zero position information.

The variable duration valve train controls the flow of air into the combustion chambers of the combustion engine. The variable duration valve train includes a drive cylinder structure, a stroke limit cylinder structure, an engine valve structure, a plurality of cams, and a working fluid. The engine valve structure attaches to the drive cylinder structure. The stroke limit cylinder structure forms a fluidic connection with the drive cylinder structure. The working fluid fills the stroke limit cylinder structure and the drive cylinder structure. The plurality of cams form mechanical linkages with the drive cylinder structure and the stroke limit cylinder structure. The working fluid and the plurality of cams limit the range of motion of the engine valve structure.

If the intake valve closing timing during cranking is constant, it can easily lead to starting problems under low-temperature conditions, and conversely, knocking under high-temperature conditions. [Solution] The internal combustion engine is equipped with an electrically operated variable valve timing mechanism that changes the phase of the camshaft and the crankshaft that open and close the intake valves within a predetermined angular range. In its default state, the variable valve timing mechanism is set to a late closing setting where the intake valve closing timing IVC is relatively far behind bottom dead center BDC. During cranking, the target conversion angle of the variable valve timing mechanism is controlled according to the coolant temperature, such that the lower the coolant temperature, the closer the intake valve closing timing IVC is to bottom dead center BDC, increasing the amount of intake air in the cylinder.

A simple positive displacement turbine engine has been discovered in which all reciprocating, oscillating and / or elliptical mass is eliminated. This special dual axis turbine engine masters near ideal & complete base four (4) Internal Combustion Engine (ICE) cycles namely; Intake, Compression, Expansion & Exhaust and further perfects them with a single draft cycle between the Intake & Compression cycles and another single draft cycle between the Expansion & Exhaust cycles for a total of six (6) cycles all completed within one (1) 360 degree rotor revolution. The combination of the intrinsic low friction & highly efficient conversion of chemical & thermal reaction into mechanical work and significantly improved cycling results in extremely high specific power and significantly improved Brake Thermal Efficiency (BTE) such that complicated, costly & problematic Variable Valve Timing (VVT) & Direct Fuel Injection (DI) systems can add no additional benefit. And yet the core moving parts (not counting roller bearings) can be reduced to as little as two (2) Intersecting rotors on dual axis and no more than four (4) where timing gears are necessary. Despite its unmatched simplicity the here disclosed special dual axis turbine engine is capable of efficiently generating high compression ratios in excess of 35: 1 @ low speeds and 40: 1 @ higher speeds without aid of external boost. Combined with the ability to initiate ignition of a vast array of combustible fuels, including Hydrogen, by multiple optimally optional means (ie Spark, Glow, Auto, Etc.) in advance of minimum combustion chamber volume without any negative work produced. Industrially significant improvements in power density, BTE AND harmful emission mitigation and even elimination are mathematically and dependably obtainable.

The application relates to a control method, device and equipment of a variable valve timing system and a vehicle, and relates to the technical field of automobile engine control. The method comprises the following steps: in response to the non-first start of the engine of the vehicle, the historical running duration of the engine after the start of the vehicle and the current temperature parameter of the engine are acquired. Then, according to the historical running duration and the current temperature parameter, a target delay duration is determined, and the variable valve timing system of the engine is controlled to start after the engine runs for the target delay duration. The target delay duration is greater than a preset threshold, and the target delay duration is negatively related to the historical running duration and the current temperature parameter. Since the duration of oil pressure establishment is related to the running duration of the engine, the target delay duration determined according to the running duration of the engine and the current temperature parameter is more accurate, so that the variable valve timing system can be rapidly started after the engine is started.

A method for starting an internal combustion engine (M) comprising a camshaft (A) equipped with an electrically operated variable valve timing (eVVT) device, comprising: / a / a step of applying maximum voltage to the electric actuator, then / b1 / a step of initiating a time delay Ts during which maximum voltage continues to be applied to said actuator and, in parallel, / b2 / a step of initiating synchronization of the internal combustion engine, then / c / if the time delay expires before the end of the synchronization of the internal combustion engine, a step of incrementing the value of the failure counter and a repetition of steps / a / to / c / if the value of the failure counter is less than a predetermined number Nmax, otherwise stopping the application of voltage to said actuator, the internal combustion engine being synchronized. Figure for publication: Figure 1

A method includes determining a value of a run motor current limit and setting a value of a start current limit equal to a predetermined value that exceeds the value of the run motor current limit if a set of predetermined conditions is satisfied. The method includes determining that operation of an engine has been interrupted, operating an electric motor of a variable valve timing mechanism with a current having a magnitude less than or equal to the start current limit after determining that operation of the engine has been interrupted, determining that operation of the engine has been restored, and operating the electric motor of the variable valve timing mechanism with a current having a magnitude less than or equal to the run motor current limit after determining that operation of the engine has been restored.

This invention discloses a method, apparatus, device, and medium for position analysis of a variable valve timing system. The method includes: acquiring sensor signals from a crankshaft position sensor and a camshaft position sensor of a preset engine during cold-engine testing; analyzing the real-time position information of the variable valve timing system of the preset engine based on the sensor signals; and determining the position state of the variable valve timing system based on the real-time position information and preset standard reference position information. This embodiment achieves position signal analysis of the variable valve timing system. By detecting the position of the variable valve timing system through the collected crankshaft and camshaft signals during cold-engine testing, the position state of the variable valve timing system is determined. This solves problems such as poor target wheel dimensional accuracy and camshaft position sensor malfunction before engine hot-test testing, ensuring the safety of the prototype.

A motor vehicle variable valve timing control system, including: a position-learning module for determining positions of teeth of at least one camshaft target; a stability-estimating module, for determining whether a variable valve timing actuator has been in a stable setpoint position for a given length of time; modules for determining and compensating for a chain jump, taking the velocity of the variable valve timing into consideration when the actuator has not been in the stable setpoint position for a given length of time; a jammed-determination module, for concluding that a variable valve timing actuator has jammed if the learned-position comparisons show an offset greater than a lower threshold angle; and a chain-jump locating module. Also disclosed is a method and a program based on such a system.

The present application belongs to the technical field of engine control, and particularly relates to a parameter setting method, a self-setting device, a storage medium and a controller; is used for self-setting of proportional integral derivative (PID) parameters of a variable valve timing (VVT) system valve position control; a fifth parameter processing step / unit replaces a calibration quantity of an engine valve timing control system with a PID parameter, optimizes parameters according to a fitness set (555) obtained by solving a weighted value of an overshoot and an absolute average error of PID control, and obtains a setting value (599) corresponding to an optimized parameter vector; a third working condition simulation step (300) and a first data excitation step (100) perfect data simulation and a traversal process, provide support for selection, variation and / or crossover operation of a first parameter set (101) and a model of a differential evolution process, can replace physical tests, and obtain optimized PID parameters of an engine or a vehicle (900) under a target working condition.