57results about How to "Improve idle speed" patented technology

An alternator system having an alternating current (ac) voltage source includes a switched-mode rectifier (SMR) coupled to the ac voltage source and having an output port coupled to an output of the alternator system, and a controller coupled to said switched-mode rectifier so as to provide a controlled pulse sequence synchronized with an angular rotor position of the (ac) voltage source to activate and deactivate the switched-mode rectifier. The controller further includes a PWM generator having a first input to receive a total duty ratio signal synchronized with an angular rotor position of the (ac) voltage source. The switched mode rectifiers are controlled to increase power output levels at lower speeds near idle. The controller combines improved idle speed power output levels with load matching improvements from PWM control for more efficient operation when compared to circuits using conventional control or PWM load matching control alone.

A method is for controlling an overrun condition in a hybrid vehicle having a combustion engine and additionally at least one electric motor as well as an overrun fuel cutoff, which interrupts a fuel supply to the combustion engine when the vehicle is in an overrun condition and restores the fuel supply when the combustion engine reaches or falls below a restoring speed. At least in a combustion engine at operating temperature, the fuel supply is restored at a restoring speed of at most 200 min⁻¹, e.g., at most 100 min⁻¹ above an idling speed of the combustion engine. The restoring speed may be in the range of the idling speed or only slightly above the latter. The restoring speed is thus clearly lowered as compared to the usual restoring speeds and extends the overrun fuel cutoff phases and thus reduces fuel consumption.

The invention relates to a logic control method for improving the starting performance of a vehicle, which comprises the following steps of: judging whether the vehicle is in a starting process at present or not by a starting-assisting function module according to a vehicle-speed signal, an engine rotating-speed signal, a speed-changer gear signal, an electronic accelerator-pedal opening signal and a braking signal; if so, calculating and outputting a starting-target idling-speed increment to an idle-speed control function module according to a current engine water-temperature signal, and controlling an engine by the idle-speed control function module to increase the starting-target idling-speed increment part to be used as a target idle speed in the starting process by the engine on the basis of an original target idle speed; and after the starting process of the vehicle is judged to be finished by the starting-assisting function module according to the vehicle-speed signal, the speed-changer gear signal, the electronic accelerator-pedal opening signal or the braking signal, quitting a starting-assisting function to enable the engine to be restored at the original target idle speed to normally operate. Through the control method, the engine can have a lower idling speed in an idle-speed state, and the vehicle has a higher idling speed in the starting process.

An outside air temperature of a vehicle is detected, an operating time of a fan is set in accordance with the detected outside air temperature based on a fan operating time map, and an idle speed increase time is set in accordance with the an operating time based on an idle speed increase time map.

A vehicle powertrain has an engine coupled to an electronically-controlled automatic transmission. A method for controlling the vehicle powertrain during a transmission shift from a neutral gear to a drive gear detects a change in a signal indicative of a desired transmission gear change from a neutral gear to a drive gear. An engine idle speed is reduced by a predetermined RPM in response to the change in the signal. The transmission is shifted from the neutral gear into the drive gear upon the engine idle speed being reduced by the predetermined RPM.

A method for operating an electrical network, in particular of a hybrid motor vehicle, the network having at least one electrical accumulator, in particular a high-voltage accumulator, at least one electric machine, and at least one inverter controlling the electric machine, the electrical accumulator being electrically disconnected from the network when a malfunction is detected and the inverter being switched to a short-circuit operating mode when a specifiable voltage limit of a network voltage of the network is subsequently exceeded. There is a provision for switching power semiconductors of the inverter in such a way that the driven electric machine induces a voltage and provides it via free-wheeling diodes on the electrical network and the induced voltage is used for operating the electric machine as a generator such that a specifiable network voltage is set by the electric machine.

The invention discloses an idle speed control method and a system for an electric vehicle. The method comprises the steps that a vehicle control unit judges whether the vehicle is in a starting stateor not; if the vehicle is in the starting state, the whole vehicle controller receives a braking torque request state signal sent by the electronic hydraulic braking controller, a gear state signal sent by the gear controller, a vehicle speed signal and an automatic parking state signal sent by the electronic stability control system, and an electronic parking state signal sent by the electronic parking controller; the vehicle control unit judges whether the received braking torque request state signal, the gear state signal, the vehicle speed signal, the automatic parking state signal and theelectronic parking state signal are respectively preset values; and if yes, the vehicle control unit sends an idling torque request signal to the motor controller, and the motor controller controls to execute idling torque output. The idle speed working condition can be increased in the electric automobile.

The invention discloses a seven-gear hydrodynamic-transmission hydraulic system, and belongs to the technical field of hydraulic transmission. The seven-gear hydrodynamic-transmission hydraulic system comprises an oil supply way and a gear-shifting control system. The oil supply way comprises an oil-supply-pump oil filter, an oil supply pump, a safety valve, a main oil pressure regulating valve, a main-manner electromagnetic valve, a control pressure regulating valve and an oil filter. The gear-shifting control system comprises linkage valves, a plurality of normally-open electromagnetic valves, electromagnetic pressure regulating valves matched with the normally-open electromagnetic valves, a plurality of normally-closed electromagnetic valves and electromagnetic pressure regulating valves matched with the normally-closed electromagnetic valves. According to the technical scheme, the torque of a transmission is changed in a hydrodynamic-transmission and gear combined manner, the transmission ratio is changed accordingly, backing of a vehicle is achieved under the condition that the rotation direction of an engine is not changed, power transmission is interrupted when a gear is at the neutral position, starting and idling of the engine are convenient, gear shifting or power outputting of the transmission is convenient, and the structure of the transmission is more compact accordingly.

In a method for operating an internal combustion engine, a crankcase of the internal combustion engine has a vent into the intake section of the internal combustion engine, and upon outgassing of fuel out of engine oil present in the crankcase, the operating point of the internal combustion engine is modified so that the air-fuel ratio does not fall below a definable value.

An intensive multifunctional fully variable valve actuation system for a 6-cylinder internal combustion engine belongs to the field of valve actuation systems of internal combustion engines and comprises oil feeders, a cycle selector, a mode converter, two-position three-way valves, a two-position two-way valve, an valve actuator and the like. The designed cycle selector only needs the two oil feeders and the two two-position three-way valves to achieve a variable valve event required by an actuating mode and a braking mode of the internal combustion mode, so that powerful functions are achieved through extremely low costs; the closing process of the valve is not restricted by the operation phase of the oil feeders, a valve advanced closing event required by idling and middle-low loads of the internal combustion engine is met, and fuel consumption and emission of the internal combustion engine in practical application can be reduced sufficiently; the intensive multifunctional fully variable valve actuation system for the 4-cylinder internal combustion engine can be applied to a naturally aspirated and turbocharged internal combustion engines only by exchanging objects communicated onto the three oil openings of the mode converter, the type adaptability is good, and the application range is wide; the arrangement of the system on a practical vehicle type can be facilitated due to the fact that components of the system are connected through oil tubes.

The invention discloses a multifunctional modularization variable valve driving system for a four-cylinder internal combustion engine, and belongs to the field of internal combustion engine variable valve driving systems. The multifunctional modularization variable valve driving system mainly comprises oil supply modules, a stage limiting module, a mode selection module, a control module, an oil conveying module, a valve driving module and the like. According to the multifunctional modularization variable valve driving system, the purpose that the valve closing process is not limited by running stages of the oil supply modules is achieved through the designed stage limiting module with the simple structure, the continuous variable valve event can be achieved only through the two oil supply modules and two two-position two-way valves, the full variable valve event can be achieved only through the two oil supply modules, two two-position three-way valves and a two-position two-way valve, and the cost is greatly reduced; the flexible conversion of a driving mode and a braking mode of the internal combustion engine is achieved through the mode selection module, the components of the system are independent in function, the modules are selected according to the requirement for the air distribution mode, the valve operation flexible degree, the existence of the braking mode and the like, the other modules do not need to be changed, the adaptability of the system is good, and the application range is wide.

A method unloads hydrocarbon emissions deposited by an exhaust gas on an after-treatment device that is employed in an exhaust system for an internal combustion engine. The method includes determining whether the engine has been operating at a preset idle speed for a predetermined amount of time. The method also includes increasing the preset idle speed by a predetermined value if the engine has been operating at a preset idle speed for a predetermined amount of time. The increasing of the engine idle speed increases a flow rate of the exhaust gas to the after-treatment device and unloads the deposited hydrocarbon emissions. A system for unloading hydrocarbon emissions deposited on an after-treatment device and a vehicle employing such a system are also disclosed.

A control device is applied for an internal combustion engine which is provided with a high-pressure fuel pump driven by a driving shaft of the internal combustion engine to discharge a fuel pressurized in a pressurizing chamber, an accumulator accumulating a high-pressure fuel discharged from the high-pressure fuel pump, and a relief valve which is opened when a fuel pressure in the accumulator is higher than a specified pressure in order to return the fuel in the accumulator to a specified chamber where a fuel has lower pressure than a fuel in the pressurizing chamber. An idle speed of the internal combustion engine is increased to a specified speed when the fuel pressure in the accumulator has been higher than a determination pressure, which is lower than the specified pressure, for a first period or longer.

The invention relates to a method for improving low-speed performance of a multi-cylinder engine. The method comprises a process of keeping an engine valve open in constant by using a solid-chained mechanism. In the first predetermined engine speed, a working piston of the solid-chained mechanism is placed on the operating position, forming the mechanical link with the engine valve, keeping the opened engine valve from closing; and in the first predetermined engine speed or the lower engine speed including zero, keeping the engine valve open in constant. Before the engine start and during the start, the working piston of the solid-chained mechanism keeps the engine valve open in constant sequentially, until the engine speed is increased from zero to the second predetermined engine speed, the working piston is switched from the operating position to the non-operating position, and cancelling the effect on the engine valve. The method uses the novel method and mechanism, and is capable of keeping an inlet valve or an exhaust valve of the engine open in constant, improving the parking, starting and idling performance of the engine, and reducing the fuel consumption and discharge of the engine.

The invention provides a method and a system for engine idle speed control. Methods and systems are provided for improving fuel economy by opportunistically lowering engine idle speed below a base idle speed when electrical loads are not present. A hydraulic brake pressure is increased when the idle speed is raised, in anticipation of vehicle propulsion. The brake pressure counteracts any creep torque and unintended vehicle acceleration resulting from the rising engine idle speed.

The invention discloses a control method for washing a carbon tank. The method comprises the steps of acquiring a carbon tank load value of the target carbon tank; comparing the carbon tank load valuewith a carbon tank load target value; increasing a first target idling speed of the target carbon tank to a second target idling speed when the carbon tank load value is greater than the carbon tankload target value; and washing the target carbon tank on the basis of the second target idling speed. According to the control method, by comparing the carbon tank load value with the carbon tank loadtarget value corresponding to the carbon tank load value, when the carbon tank load value is greater than the carbon tank load target value, the first target idling speed of the target carbon tank isincreased to the second target idling speed, and the target carbon tank is washed on the basis of the second target idling speed. The idling speed of washing the carbon tank is increased, and the problems are solved that that since closed-loop feedback of an oil channel has a certain lag, a certain impact is caused on the air-fuel ratio and idling speed, and when the idling speed is low, due to the severely-changed idling speed, flameout occurs.