38 results about "Atkinson cycle" patented technology

The invention discloses a double-crankshaft-contained variable-compression-ratio Atkinson-cycle internal-combustion engine mechanism, which is an internal-combustion engine technology and is used for improving the usability of an Atkinson-cycle internal-combustion engine and improving the thermal efficiency of the internal-combustion engine to enable the thermal efficiency to be approximate to the highest theoretical efficiency of a Carnot cycle. The mechanism comprises a rocking arm, a second crankshaft, a connecting rod of the second crankshaft, a driving chain, a phase regulator and a derived three-crankshaft Atkinson internal-combustion engine mechanism, wherein the rocking arm is used for connecting a piston connecting rod and a connecting rod of a first crankshaft; the second crankshaft and the connecting rod of the second crankshaft are used for driving the rocking arm to make periodic motion; the driving chain is used for connecting gears on the first crankshaft and the second crankshaft; the gear ratio of the gear for the first crankshaft to the gear for the second crankshaft is 1:2; and the phase regulator is used for regulating the rotary phase relation between the first crankshaft and the second crankshaft. Through the double-crankshaft-contained variable-compression-ratio Atkinson-cycle internal-combustion engine mechanism, the fuel efficiency of a naturally-aspirated internal-combustion engine can be effectively improved, and meanwhile, the double-crankshaft-contained variable-compression-ratio Atkinson-cycle internal-combustion engine mechanism has the actions of additionally regulating the compression ratio and changing the discharging quantity within a small range.

The invention relates to an Atkinson cycle engine control system belonging to the technical field of automobile engines and comprising a sensor system, a control executing mechanism and an engine control unit, wherein the sensor system is used for inputting the collected signals to the engine control unit, and the engine control unit is used for outputting a control instruction comprising a control throttle valve, an oil atomizer, a variable air inflow and exhaust correct timing device and a spark plug to the control executing mechanism. The invention can accurately control the air-fuel ratioof an Atkinson cycle engine and improve the economy and the exhaustion of the Atkinson cycle engine, adopts greatly higher geometrical compression ratio than that of the general gasoline engine so the opening of an intake valve is enlarged under low load, controls the oil atomizing amount and the ignition advance angle and controls the air-fuel ratio in the range of 16-19 so that thin combustion is formed, and therefore, the Atkinson cycle engine has improved combustion efficiency and more stable combustion.

The invention discloses a multi-mode two-stroke atkinson cycle internal-combustion engine with a fully overhead valve. According to two-stroke atkinson cycle, a scavenging process is offset on the basis of the two-stroke cycle, the distance of a compression stroke is reduced, and the distance of an expansion stroke is prolonged, and therefore, the atkinson cycle is realized and the balance of the internal-combustion engine is kept. On the basis of a common two-stroke internal-combustion engine, the multi-mode two-stroke atkinson cycle internal-combustion engine adopts an overhead embedded inlet valve with large gradient degree and an air cylinder head structure of a common exhaust valve, when the inlet valve is opened, the inlet valve temporarily serves as a separation board, a guiding function of a bulge on a formed top piston is utilized, so that a high-efficiency scavenging structure is realized; a fully variable valve timing mechanism is used to adjust the angle relation of the valve and a crank shaft, the opening and closing time of the inlet and outlet valve can be adjusted, and therefore, the internal-combustion engine has the following working modes: two-stroke atkinson cycle, two-stroke cycle and adjustable discharge capacity and compression ratio; and the efficiency of the internal-combustion engine is greatly improved.

The invention provides a low-pressure waste gas recirculating system based on a supercharged engine. The supercharged engine comprises a gas inlet side and a gas compressor arranged on the gas inlet side. The low-pressure waste gas recirculating system comprises a waste gas recirculating loop, an auxiliary waste gas recirculating loop and a controller; the waste gas recirculating loop is used for introducing part of waste gas exhausted out of a Miller and/or Atkinson circulating engine into the gas inlet side through the gas compressor for reburning; the auxiliary waste gas recirculating loop is used for introducing part of the waste gas exhausted out of the Miller and/or Atkinson circulating engine into the gas inlet side for reburning on the condition that the gas compressor is not used; the controller is used for controlling the waste gas to selectively flow through the waste gas recirculating loop and the auxiliary waste gas recirculating loop according to the vehicle driving speed. According to the low-pressure waste gas recirculating system based on the supercharged engine, part of the waste gas exhausted out of the engine can enter an air cylinder for reburning through the gas compressor or not through the gas compressor under the different conditions, therefore, the gas temperature in the air cylinder before stroke compressing and the gas temperature at the beginning of burning can be increased, then the engine efficiency is improved, and the waste gas recirculating rate is increased.

The invention relates to an Atkinson cycle engine air-fuel ratio control system in the technical field of automobile engines, which comprises an engine electric control unit, an inlet reflow estimation unit, a residual gas estimation unit, an engine rotating speed sensor, a throttle position sensor, a cam shaft position sensor, an oxygen sensor and a fuel sprayer, wherein the engine electric control unit, the inlet reflow estimation unit, the residual gas estimation unit and an engine air-fuel ratio feedforward controller are connected through a controller area network (CAN) bus; and the engine rotating speed sensor, the throttle position sensor and the cam shaft position sensor are connected with the engine electric control unit through a signal wire. The invention combines the air-fuel ratio feedforward control and the air-fuel ration feedback control, determines the fuel spraying amount in real time according to different inlet reflow amount and residual gas amount in a cylinder, improves the accuracy and the transient response characteristic of the air-fuel ratio control, and effectively improves the economy and the exhaust performance of the engine.

The invention provides a power generation system of an Atkinson cycle engine. The power generation system comprises the Atkinson cycle engine and an outer rotor generator, wherein the Atkinson cycle engine comprises an air cylinder body, an air cylinder cover connected with the air cylinder body, a piston connecting rod mechanism arranged in the air cylinder body and a crankshaft connected with the piston connecting rod mechanism; the outer rotor generator is directly connected with the crankshaft for power generation and comprises an inner stator, an outer rotor sleeving the inner stator and an outer rotor bracket for supporting the outer rotor; the inner stator is fixedly connected with the air cylinder body; the outer rotor is fixedly arranged on the circumference of the outer rotor bracket; and the center of the outer rotor bracket is directly connected with an output end of the crankshaft. The outer rotor of the outer rotor generator is directly connected with the crankshaft of the Atkinson cycle engine, so that heavy flywheels used by a traditional engine are omitted; the outer rotor in the whole system acts as the outer rotor of the generator, simultaneously acts as an energy storage component of the engine, has double effects and plays a role in reducing the weight of the power generation system; and meanwhile, the number of spare parts is also reduced.

The invention discloses a balance device of an internal combustion engine, which relates to balance technology of a reciprocating piston internal combustion engine. The ride comfort of an existing internal combustion engine, particularly a line four-cylinder internal combustion engine, is much poorer than that of a V-type internal combustion engine due to the fact that a quadratic term portion of vibration of movement of a piston of the existing internal combustion engine cannot be balanced. The balance device is characterized in that a counterweight with a certain mass is driven by a reciprocating control device to reciprocate, accordingly, more complicated vibration can be balanced, each cylinder of the internal combustion engine can be independently and dynamically balanced, fuel economy is improved, and Atkinson cycle internal combustion engine which cannot realize dynamic balance easily can be widely applied. The balance device can also be used for balancing more other types of vibration including vibration with varying vibration strength, varying vibration amplitude and varying vibration frequency, damping vibration and self-excited vibration, and can also be widely applied to vibration elimination in the mechanical field.

A method for improving the Otto cycle, Diesel cycle and Atkinson cycle is disclosed, which can lower the specific consumption rate of fuel for the reciprocating 4-stroke IC engine and increase its power performance.

The invention discloses a four-stroke reciprocating piston internal combustion engine which comprises a piston, a connecting rod and a bent shaft. The piston is connected onto a connecting rod shaft neck of the bent shaft, an eccentric shaft is sleeved on the connecting rod shaft neck, a connecting rod big end of the connecting rod is sleeved on the eccentric shaft, a driving mechanism capable of driving the eccentric shaft to self rotate is further arranged on the eccentric shaft, and the eccentric shaft rotates for one ring when the bent shaft rotates for two rings each time. Compared with the prior art, a piston stroke of the internal combustion engine in suction and exhaust strokes is larger than that in working and compression strokes, exhaust gas can be discharged out of the cylinder to the greatest extend, temperature in the cylinder can be reduced, more fresh low-temperature air can be sucked in a next suction stroke, burning is sufficient, and power of the internal combustion engine is promoted. Compared with the existing Atkinson circulation internal combustion engine, the internal combustion engine overcomes the shortcoming that a multiple-rod mechanism of the internal combustion engine is complex, high in failure rate and poor in low velocity torsion, and the internal combustion engine has power exceeding Otto cycle.

The invention discloses an Atkinson cycle engine combustion system which comprises a cylinder cover and a piston. The design that the compression ratio of the piston is within the range from 4 to 12 is met, a top face of the piston is designed to be of a protruding structure, and the central area of the top face is designed to be in a concave spherical structure. Lift ranges of an exhaust valve, a first intake valve and a second intake valve are non-variable-valve lift ranges. The valve motion of the first intake valve and the valve motion of the second intake valve are driven by the same mechanism, the motion curves of the first intake valve and the second intake valve are not symmetrical and form an oblique axis vortex, the first intake valve and the second intake valve respectively comprises the lift range and a phase, vortex motion is formed in the air inside the cylinder due to the asymmetrical phase design, the asymmetrical design is combined with tumble and vortex and forms oblique axis vortex, and form much stronger turbulent motion at the ignition moment, and therefore the combustion efficiency is improved. According to the Atkinson cycle engine combustion system, on the premise that an original cylinder cover is not changed, due to the reasonable design of the valve motion and a combustion chamber, the combustion efficiency of the Atkinson cycle engine can be improved, therefore, a part of load oil consumption is reduced, and the low-speed torque is improved. The Atkinson cycle engine combustion system has the advantages of being simple in structure and easy to implement.

The invention discloses a split type superhigh-expansion-ratio engine and an adjustment and control method and belongs to the field of engines. The split type superhigh-expansion-ratio engine comprises a gas compression device, an expansion acting device and a high-pressure pipe. A high-pressure gas tank is arranged between the gas compression device and the expansion acting device and is in gas circuit connection with the gas compression device and the expansion acting device through the high-pressure pipe. The air cylinder volume of the expansion acting device is greater than the air inlet natural volume. The split type engine is different from a common Otto-cycle internal combustion engine in that the gas compression stroke is moved into the gas compression device out of an acting cylinder and the engine is provided with the high-pressure gas tank for achieving buffering, pressure stabilization and temporary storage of compressed gas. By means of a certain technical scheme and the adjustment and control method, the engine can achieve the Atkinson cycle easily at the low cost in all working conditions; and in addition, the expansion ratio can be far greater than the compression ratio under the working condition of small acceleration, thus, oil consumption is remarkably lowered, and the effect is particularly obvious under the working condition of the small acceleration.

A control system according to one aspect of the present invention is applied to an engine. The engine comprises a cylinder injector and an intake valve driving device capable of changing the closing timing of an intake valve. If the execution condition is satisfied when the injection timing of fuel of the cylinder injector is before intake bottom dead center and an Atkinson cycle is carried out, the engine delays the injection timing of the fuel of the cylinder injector to a time after intake bottom dead center, injects the fuel, then executes fuel cut control.

A novel power-producing concept is disclosed, employing a rotating-plate radial gas turbine in various gas-turbine cycle configurations. The “rotating-plate radial gas turbine” is a rotating barrel with robust rectangular plates fitted into the turbine rotor, performing the function and the role of turbine blades, contained within a motionless rigid horizontal cylinder (casing). Combustion can take place in the spaces confined between adjacent rotating plates and the static cylinder, thus enabling a practical achievement of the Atkinson cycle (constant-volume heat addition) with improved cycle thermal efficiency. Alternatively, two or more compressor stages can be combined to feed a single rotating-plate radial gas turbine in cascades, thus gradually increasing pressure of working gas within a volume bordered by adjacent un-cooled rotating plates of the radial gas turbine and the casing. Alternatively, a single compressor may be combined with one or more stages of an axial turbine for cascade feeding of a single rotating-plate radial gas turbine. This “isochoric stuffing” effect enables achievement of significantly and even drastically improved gas-turbine-cycle thermal efficiencies. Cycle heat addition may be either isobaric or isochoric in either an open-cycle or a closed-cycle configuration. Using a sufficiently efficient radial gas turbine, it is theoretically possible to obtain 100% cycle thermal efficiency in a simple radial-gas-turbine configuration with appropriately chosen compressor-stages compression pressure ratios.

A control system according to one aspect of the present invention is applied to an engine. The engine comprises a port injector and an intake valve driving device capable of changing the closing timing of the intake valve. The engine, if an execution condition for performing a fuel cut control is satisfied when performing an Atkinson cycle, executes the fuel cut control after advancing the closing timing of the intake valve. As a result, by reducing the amount of the fuel which is blown back to the inside of the intake passage in a period where the intake valve is open after intake bottom dead center, the amount of the fuel which flows into the exhaust passage as unburned gas when the fuel cut control is executed can be reduced.

An Atkinson cycle implement method for a natural air suction gasoline engine comprises the following steps: (1) a high-energy ignition coil is used, and the ignition energy of the ignition coil is atleast 80 mJ; (2) an EGR pressure stabilizing cavity is integrated on an air inlet manifold, the EGR system takes exhaust gas from the outlet of an exhaust manifold, and the exhaust gas enters the EGRpressure stabilizing cavity after passing through the EGR system, and the exhaust gas is gathered in the EGR pressure stabilizing cavity and evenly distributed to each branch pipe of the inlet manifold; (3) a high-rolling-flow air inlet channel is used for matching a piston with a shallow pit on the top surface; (4) the intake camshaft is of a variable valve phase system, the phase adjustment angle of the intake valve is 58 DEG crankshaft angle, the delay closing of the intake valve is achieved, the maximum delay closing angle of the intake camshaft is maximum above 100 DEG crankshaft angle after the bottom dead center, and the effective compression ratio of the engine is adjusted. According to the method, the low-load misfire rate can be effectively reduced, high-load knocking can be restrained, the intermediate load heat efficiency is improved, and the combustion stability of the whole working condition is improved.