45results about How to "Reduce engine load" patented technology

A sound-cancelling flow-through muffler includes a linear first inner passage, and a curved or zig-zagged second outer passage that wraps around or surrounds the inner passage and that is situated between the linear first inner passage and an exterior wall of the muffler. The outer passage has a length that is equal to, or a multiple of, one-half the wavelength of sound to be cancelled by the muffler such that sound exiting the inner and outer passages destructively interferes or cancels in a sound cancellation or conversion chamber. In addition, the walls of the outer passage serve as a heat sink to extract heat from the exhaust stream and conduct the heat to the outside of the housing. Alternatively, the outer passage may have a closed such that reflects sound back toward the inner passage for cancellation, the walls of the outer passage continuing to serve as a heat sink to extract heat from the exhaust stream and conduct the heat to the outside of the housing.

Various systems and methods are described for controlling fuel injection in a variable displacement engine. One method for a deactivatable cylinder comprises, before deactivating the cylinder responsive to operating conditions, disabling a port injector and fueling the cylinder only via the direct injector. The method further comprises, when reactivating the cylinder from deactivation, enabling both the port injector and the direct injector, and injecting a higher amount of fuel via the direct injector while simultaneously injecting a lower amount of fuel via the port injector.

A flow-through muffler includes a plurality of heat conducting walls, baffles, or partitions that together define a plurality of passages arranged to form acoustic waveguides, attenuators, and / or cancellation chambers, the walls, baffles, or partitions increasing a surface area exposed to the exhaust gases to facilitate extraction of heat while attenuating or canceling the resulting sound pressure waves. The muffler may have a cooling arrangement mounted thereon, and thermoelectric generator elements or other heat-powered device, such as a reformer, connected across the heat differential between the cooling arrangement and an exterior surface of the muffler housing that is in thermal contact with the heat conducting walls, bafflers, or partitions. In addition, the muffler may be made tuneable by providing a device for varying a length of one of the passages relative to another passage, and by including a sound cancellation chamber at an intersection of the passages. In addition, the internal surfaces of the muffler may be coated with a catalyst to provide a combination muffler and catalytic converter.

In a power generating controller of a vehicle, electric power of a first power supply, employed at engine startup and during vehicle driving, is conserved to decrease power needed for charging of the first power supply and to reduce engine load by operation of a generator. In addition, deceleration energy, which has not been utilized conventionally, can be recovered to a second power supply, which enables use of power generation (regeneration) during deceleration of the vehicle, during which fuel is not required, to improve efficiency of the generative operation of the generator.

To provide a power module driving control apparatus and a hybrid vehicle capable of obtaining sufficient accelerator response despite adoption of a speed sensing type clutch for connection and disconnection of a power drive between an engine side and a driving wheel side. When a rotational speed on an input side of a centrifugal clutch falls short of a set value, at which the clutch can be connected, and an acceleration request is made by a rider, a control unit controls a motor generator so as to bring the rotational speed on the input side of the clutch near to the set value. When the motor generator is made to function as a motor, rotation on the input side of the clutch is assisted. When the motor generator functions as a generator, an amount of electricity generated is decreased.

Methods and systems are provided for expediting EGR purging in a hybrid vehicle during transient operations, such as tip-out to lower load conditions. In response to decreasing engine torque demand, engine fueling is disabled and a motor is used to spin the engine unfueled until a desired LP-EGR rate is achieved. Alternatively, engine operation is maintained with EGR disabled until the desired LP-EGR rate is achieved, and the excess engine torque generated is stored in a system battery.

Systems and methods for improving operation of a hybrid vehicle are presented. In one example, engine operation is adjusted in response to a change in engine operating conditions that result in a fractional amount of cylinder charge comprised of exhaust gas changing by more than a threshold percentage. The approaches describe may improve vehicle drivability and fuel economy.

An electronic controller variably controls the center of an operating angle of an intake valve as follows: when an engine load factor is equal to or higher than a threshold in a low load operation, the electronic controller advances the center of the operating angle with a decrease in the engine load factor. When the engine load factor is lower than the threshold in the low load operation, the electronic controller retards the center of the operating angle with a decrease in the engine load factor.

A proposition is to provide a power transmission mechanism for parallel hybrid vehicle that is capable of smoothly combining / separating input / output powers of a motor and an engine, and is applicable to a large hybrid vehicle by ensuring sufficient strength of a mechanism for combining and separating the input / output powers.It is characterized by including a motor output shaft of the motor / generator rotatable separately from an engine drive shaft system extending from a main clutch to a transmission, a motor-brake mounted on one end side of the motor output shaft to release / fix the motor output shaft, and a planetary gear mechanism mounted between another end side of the motor output shaft and the engine drive shaft system and including a sun gear provided on the other end side of the motor output shaft, an outer gear provided on the engine drive shaft system and having a gear ratio to the sun gear of 1:1, a plurality of planetary gears with which the sun gear and the outer gear are engaged, and a planetary carrier picking up orbital motions of the planetary gears, and a gear brake mounted on one end side of the planetary carrier to release / fix the planetary carrier.

To provide a drive control system for a working vehicle, which can prevent engine stall with certainty even when a large load suddenly acts on a vehicle-mounted engine and which is also excellent in environment friendly performance.When a vehicle speed of a wheel loader (1) is determined to be not higher than a reference value (Yes) in step S4 and a forward / reverse command means (40) is determined to have been switchingly operated (Yes) in step S5, the routine advances to step S6 where an increment ΔN of engine speed according to an engine load factor is determined. In step S7, the increment ΔN of engine speed is then added to a target engine speed Na corresponding to a depression stroke of an accelerator pedal (38), the thus-determined Na=Na+ΔN is set as a new target engine speed Na, and a target engine speed command i1 is sent to an engine controller (37).

A hydrostatic system and method of operation thereof, wherein at least one of a fluid motor and a pump of the system has a displacement which is variable for controlling a speed of operation of the motor, the pump being driven by an engine, and a controller configured for monitoring the speed of operation of the motor and an operating characteristic of the engine and automatically controlling the displacement responsive thereto, wherein if the operating characteristic is indicative of engine performance above a predetermined threshold, the controller will control the displacement for maintaining the speed of operation of the motor at about a predetermined value, and, if the operating characteristic is indicative of engine performance below the threshold, the controller will hold the displacement at a constant value. As a result, the controller can prevent the system from further decreasing the engine performance. And, if the engine performance increases to that or another threshold, the controller will automatically switch back to controlling the displacement for holding the motor speed at the predetermined value, optionally including to incrementally increase the speed to the predetermined value.

An electronic controller variably controls the center of an operating angle of an intake valve as follows: when an engine load factor is equal to or higher than a threshold in a low load operation, the electronic controller advances the center of the operating angle with a decrease in the engine load factor. When the engine load factor is lower than the threshold in the low load operation, the electronic controller retards the center of the operating angle with a decrease in the engine load factor.

The invention relates to an ethylene copolymer having excellent processability, and more particularly, relates to an ethylene copolymer having excellent extrusion processability and being prepared in a gas-phase reactor with a metallocene catalyst. The metallocene catalyst includes (A) a metallocene catalyst component, (B) a non-halogenated mono-ring pentadiene 4-group metal compound, (C) activative cocatalyst, and (D) a carrier component.

A device for controlling an on-vehicle power generator is provided with switching means, detecting means, voltage control means, startup control means and normal state control means. The voltage control means controls the output voltage of the power generator together with the switching means. The detecting means detects state of the power generation including a startup state where the engine is in startup condition and a normal state where normal power generation has been performed. The startup control means controls the voltage control means to start / stop of the power generation based on the frequency of the phase voltage of the power generator in the startup state. The normal state control means controls the voltage control means in the normal state such that the normal state control means controls the voltage control means to continue the power generation or stops the power generation based on the frequency of the phase voltage.

In a control of a vehicular automatic transmission, an engaging device provided in a power transmission path between an engine and driving wheels is brought into a slipping state or a release state when a certain neutral control condition is satisfied while a shift lever is placed in a running position, the engaging device is engaged so as to increase a torque transmission capacity thereof when a certain neutral control cancellation condition is satisfied during neutral control under which the engaging device is in the slipping state or the release state, and an engaging pressure of the engaging device is held at a constant pressure level for a given period of time when an accelerator pedal is depressed while the engaging device is engaged so as to increase the torque transmission capacity thereof.

Methods and systems are provided for improving the performance of a variable displacement engine. Split injection and spark retard may be used in active cylinders during a VDE mode to heat an exhaust catalyst and extend the duration of VDE mode operation. Split injection and spark retard may also be used in reactivated cylinders at a time of cylinder reactivation to improve restart combustion stability.

Methods and systems are provided for improving the performance of a variable displacement engine. Split injection and spark retard may be used in active cylinder during a VDE mode to heat an exhaust catalyst and extend the duration of VDE mode operation. Split injection and spark retard may also be used in reactivated cylinders at a time of cylinder reactivation to improve restart combustion stability.

A vehicle having an electric generator control apparatus is provided for gradually reducing an engine load imposed due to electricity generation while a throttle valve is in the process of becoming fully open, thereby increasing a vehicle acceleration capability. The electric generator control apparatus is incorporated in a vehicle which has an ACG starter motor for generating electric power from power of an engine and supplying the generated electric power to a battery and other electric loads. When an engine throttle opening exceeds a preset value, the electric generator control apparatus continuously gradually reduces the amount of electric power generated by the ACG starter motor depending on the throttle opening in a fully opening direction which exceeds the preset value. The load imposed on the engine by electricity generation is gradually reduced, resulting in a corresponding increase in the acceleration capability of the vehicle.

A diesel engine capable of favorably preventing the generation of white smoke even when an engine load is shifted from a high load side to a low load side. For this purpose, a diesel engine (1) includes fuel injection timing control means (42) for controlling fuel injection timing, the fuel injection timing control means (42) advances the fuel injection timing by predetermined time when an engine load becomes a predetermined load (Ff) or lower in an engine stopping step of stopping the diesel engine while gradually reducing the engine load.

A vehicle having an electric generator control apparatus is provided for gradually reducing an engine load imposed due to electricity generation while a throttle valve is in the process of becoming fully open, thereby increasing a vehicle acceleration capability. The electric generator control apparatus is incorporated in a vehicle which has an ACG starter motor for generating electric power from power of an engine and supplying the generated electric power to a battery and other electric loads. When an engine throttle opening exceeds a preset value, the electric generator control apparatus continuously gradually reduces the amount of electric power generated by the ACG starter motor depending on the throttle opening in a fully opening direction which exceeds the preset value. The load imposed on the engine by electricity generation is gradually reduced, resulting in a corresponding increase in the acceleration capability of the vehicle.

Methods and systems are provided for expediting EGR purging in a hybrid vehicle during transient operations, such as tip-out to lower load conditions. In response to decreasing engine torque demand, engine fueling is disabled and a motor is used to spin the engine unfueled until a desired LP-EGR rate is achieved. Alternatively, engine operation is maintained with EGR disabled until the desired LP-EGR rate is achieved, and the excess engine torque generated is stored in a system battery.

A drive system includes an engine, an alternator coupled to the engine, the alternator being configured to power at least one auxiliary load, a traction motor system operatively coupled to drive wheels of the vehicle, the traction motor system being configured for receiving primary electrical power from the alternator and for propelling the vehicle in response to the primary electrical power, and a motor electrically connected to the traction motor system and mechanically coupled to the engine. The motor is configured to receive electrical power from the traction motor system in a dynamic braking mode of operation of the traction motor system and to communicate power to the engine during the dynamic braking mode.

A drive system includes an engine, an alternator coupled to the engine, the alternator being configured to power at least one auxiliary load, a traction motor system operatively coupled to drive wheels of the vehicle, the traction motor system being configured for receiving primary electrical power from the alternator and for propelling the vehicle in response to the primary electrical power, and a motor electrically connected to the traction motor system and mechanically coupled to the engine. The motor is configured to receive electrical power from the traction motor system in a dynamic braking mode of operation of the traction motor system and to communicate power to the engine during the dynamic braking mode.

Systems and methods for operating a vehicle driveline that includes an engine and an electric machine are described. In one example, an amount of electrical power that is available to electrical consumers that are electrically coupled to a high voltage bus is adjusted responsive to a temperature of a catalyst for the purpose of reducing engine emissions.

Various systems and methods are described for controlling fuel injection in a variable displacement engine. One method for a deactivatable cylinder comprises, before deactivating the cylinder responsive to operating conditions, disabling a port injector and fueling the cylinder only via the direct injector. The method further comprises, when reactivating the cylinder from deactivation, enabling both the port injector and the direct injector, and injecting a higher amount of fuel via the direct injector while simultaneously injecting a lower amount of fuel via the port injector.

Provided is a vehicle generator control method. An engine ECU controls the generator according to an operating condition of the engine, and the control process is as follows: when the engine ECU determines that the engine is in a starting condition, the engine ECU controls a generator separately excited loop to be disconnected, so that the generator does not generate electricity; and when the engine ECU determines that the engine enters an idling condition, the engine ECU controls the generator separately excited loop to be closed, so that the generator is started to generate electricity, and after the generator is started to generate electricity, the generator carries out normal electricity generation until the engine stops operating. Through the vehicle generator control method, the starting load of the engine can be effectively reduced, and cold starting capacity is improved. Also provided is a vehicle generator control system.