49results about How to "Shorten light-off time" patented technology

The invention discloses a device and method for controlling the inlet temperature of a three-way catalytic converter according to OBD monitoring efficiency. The device comprises an exhaust pipe, a three-way catalytic converter, an electric heating device and an engine electronic control system, wherein the exhaust pipe comprises an engine exhaust gas inlet end; the inlet end of the three-way catalytic converter is connected with the engine exhaust gas inlet end; the electric heating device is arranged at the outer part of the exhaust pipe, distributed close to the inlet end of the three-way catalytic converter and used for heating exhaust gas before the inlet end of the three-way catalytic converter; and the engine electronic control system comprises an electronic control unit, an OBD system, an exhaust temperature sensor, a concentration sensor and a control relay, wherein the electronic control unit is separately electrically connected with the exhaust temperature sensor, the controlrelay and front and rear oxygen sensors, and the electronic control unit can control the working state of the electric heating device by controlling the connection and disconnection of the control relay. According to the device, the inlet temperature of the three-way catalytic converter can be raised in the cold starting and machine heating process of the engine, and the converting efficiency ofthe three-way catalytic converter is increased.

An alumina-based lean NO_x trap system for use in a HCCI engine exhaust is provided which includes at least one alumina-based lean NO_x trap comprising a catalyst, an alumina NO_x absorbent material, and optionally, from 0 to about 4 wt % of an alkaline earth metal oxide; and a conventional three-way catalyst. The lean NO_x trap system substantially oxidizes HC and CO and converts at least a portion of NO_x contained in the exhaust gas to N₂ at a temperature between about 150° C. to about 250° C. in HCCI mode. The system also effectively removes HC, CO and NO_x at high temperature when the engine is in SI mode (stoichiometric conditions). The alumina-based lean NO_x trap in the system also undergoes efficient desulphurization and maintains its activity with extended use.

The invention provides a control method for an engine electric heating type catalytic converter. The control method is used for accelerating rapid ignition of a catalyst of a vehicle engine in a coldstart stage and a cold machine stage, so that reasonable and effective control over gas emission is achieved. The control method comprises the following steps that an engine control unit controls a power supply of the electric heating type catalytic converter to be on or off through a relay, and when electric heating is required, the engine control unit performs instrument checking according to the start and stop condition of the engine to control the electric heating time of the electric heating type catalytic converter. After receiving a signal for starting the engine, the engine control unit firstly determines either start this time is cold machine start or warm machine start, if the startup is cold machine start, the engine control unit checks a preset cold machine electric heating instrument based on the ambient temperature and outputs the corresponding time length of the electric heating of the catalytic converter; and if startup this time is warm machine startup, the engine control unit checks a warm machine electric heating instrument based on the engine down time and the ambient temperature and outputs the corresponding time length of electric heating of the catalytic converter.

The invention relates to a scavenging control method of a homogeneous turbocharged direct injection gasoline engine. The scavenging control method is characterized by including the following specific control steps that in a low-revolution-speed large-load area of the homogeneous turbocharged direct injection gasoline engine, the intake and exhaust variable valve timing (VVT) angle is controlled, and residual gas remaining in a cylinder is reduced; the purpose of controlling the scavenging amount is achieved by controlling the overlapping angle of the intake VVT opening angle and the exhaust VVT closing angle; weak scavenging or strong scavenging can be selected through a precise gas amount and fuel amount control system in a scavenging area according to the central temperature of a catalytic converter, and the fuel injection quantity is calculated according to the quantity, calculated through a model, of fresh air in the cylinder and the target value of the air-fuel ratio in the cylinder; before the temperature of the catalytic converter reaches an ignition temperature, a weak scavenging mode is adopted by the system, the temperature of the catalytic converter can be quickly increased, and the ignition time of the catalytic converter is shortened; and after the temperature of the catalytic converter exceeds the ignition temperature, a strong scavenging mode is adopted by the system, an exhaust-temperature low supercharger can work for a long time, and compared with the weak scavenging mode, the higher torque and the higher power output can be provided. By means of the method, the temperature of the catalytic converter can be quickly increased through after-burning; during strong scavenging, the fuel injection quantity can be calculated through the model, the air-fuel ratio in the cylinder is made to be 1, the exhaust temperature is lower than that of the weak scavenging mode, and long-time work can be achieved; and the combustion torque and output power can be increased through both the weak scavenging mode and the strong scavenging mode.

The invention provides an integrated-designed engine cylinder cover. The engine cylinder cover integrates an exhaust manifold, an EGR cooling device and a secondary air channel device simultaneously. The exhaust manifold is integrated on the exhaust side of the engine cylinder cover. A gas inlet of the EGR cooling device is integrated on the exhaust manifold. A gas outlet of the EGR cooling device is integrated on the gas inlet side of the engine cylinder cover. The secondary air channel device is integrated on the exhaust manifold. The engine cylinder cover is installed as a whole, too many exhaust manifolds, external type EGR cooling devices, external type secondary air channel devices and other parts do not to be installed, through the highly integrated engine cylinder cover, the number and weight of parts of the complete machine are reduced, oil consumption and discharge performance of an engine is also improved significantly, meanwhile, the design of the complete machine is more compact, and the cost of the complete machine has more advantages.

A heat insulator is wound around an outer periphery of a vehicle exhaust pipe. The heat insulator comprises a deformable sheet-shaped heat insulating material hermetically encased in a reduced pressure state in a bag member comprised of heat-resistant metal foil.

A system and method for operating an engine turbocharger is described. In one example, the turbocharger is rotated in different directions in response to operating conditions. The system and method may reduce engine emissions.

Systems and methods for operating an engine and a transmission to reduce a catalyst light off time are disclosed. In one example, clutches of a transmission are operated to provide a desired load to the engine so that engine combustion stability may be improved while supplying heat to a catalyst so that the catalyst light off time may be reduced.

The invention discloses an exhaust treatment system. Air is leaded into an exhaust pipe through an air compressor and an ejector, is mixed with waste gas in the exhaust pipe, and flows to a catalytic converter. The exhaust treatment system can adjust the temperature of the waste gas in the exhaust pipe and the excess air coefficient to satisfy optimal chemical reaction conditions of the catalytic converter; meanwhile, when an engine is started, a high-concentration fuel generates a large quantity of HC and CO; and the HC and CO are mixed with the leaded-in air in the catalytic converter for burning to heat the catalytic converter, so that the temperature of the catalytic converter quickly rises, the burning rising time of the catalytic converter is shortened, the working time is ahead of time, and the problem of injurant increment caused by the starting of the engine is reduced.

The invention relates to a novel chip type potentiometric automobile oxygen sensor. The sensor comprises a protective layer, a signal layer and a heating layer, which are sequentially superposed, wherein the signal layer comprises seven layers of tape casting substrates which are sequentially laminated, the protective layer, an upper reactive electrode insulating layer, an outer reactive electrode and a lower reactive electrode insulating layer are sequentially arranged on the upper surface of the first layer of tape casting substrate from top to bottom, and an upper reference reactive electrode insulating layer, a reference reactive electrode and a lower reference reactive electrode insulating layer are sequentially arranged on the lower surface of the fourth layer of tape casting substrate from top to bottom; the heating layer comprises fourth layers of tape casting substrates which are sequentially laminated, and a heating electrode and a heating electrode pin are respectively arranged on the upper surface of the uppermost layer of tape casting substrate and the lower surface of the lowermost layer of tape casting substrate. The sensor is prepared by preparation of multiple kinds of tape casting slurry, tape casting forming, edge removal slitting, punching, printing, superposition, vacuum sealing molding, hot isostatic pressing, slitting and sintering. The oxygen sensor has the advantages of being more stable in performance and higher in production consistency.

The invention relates to the field of motor vehicles, and discloses a cold start method, device and equipment of a motor vehicle, and a storage medium thereof. The cold start method of the motor vehicle comprises the steps of executing the following operation to at least one cylinder in an internal combustion engine of the motor vehicle repeatedly till the preset conditions are met if determiningthat the motor vehicle is subjected to cold start; compressing gas in the cylinder through a piston of the cylinder via control over an intake valve and an exhaust valve of the cylinder and a coolingsystem of the internal combustion engine, so that the gas temperature is increased; enabling the intake valve to be in the open state and accordingly enabling the heated gas to enter an air inlet waythrough the intake valve if the piston reaches the position with the first preset distance from the top dead center in the uplink process; and controlling the internal combustion engine to perform fuel injection ignition operation. According to the cold start method, through control over the cooling system and intake and exhaust systems, heating of parts and components of a combustion system is achieved, so that fuel evaporation is promoted effectively, and hydrocarbon emissions in the cold start process are reduced.