50results about How to "Shorten light-off time" patented technology

A fast light off flow-through ceramic substrate is provided that is particularly adapted for use as a catalytic converter. The substrate is formed from a body of ceramic material having axially opposing inlet and outlet ends for receiving and expelling the flow of automotive exhaust gas, respectively. The body contains a network of walls coated with a catalyst that define axially-oriented flow-through cell channels. The average thermal mass (ATM1) of a first axial region of the walls adjacent to the inlet end is at least 20% less than the average thermal mass (ATMTOT) of all of the walls. The lower average thermal mass of the walls in the first region advantageously shortens the light off time for the catalyst within the substrate to effectively neutralize automotive pollutants. The reduction of the average thermal mass in only the first axial region of the walls advantageously maintains the strength of the resulting body of ceramic material, and further increases the cool down time of the body.

An engine receiving boost from a supercharger and / or a turbocharger compressor is provided, along with methods for its operation. The engine may include inline cylinders arranged on an engine block and an integrated exhaust manifold (IEM), where exhaust flow from inner cylinders is kept separate from exhaust flow from outer cylinders within the IEM and where exhaust flow from the inner cylinders but not the outer cylinders flows through a turbine of the turbocharger. The supercharger and turbocharger compressor may be arranged in parallel upstream of an intake manifold of the engine, and throttles upstream of each of the supercharger and compressor may be controlled to direct intake air through one or both of the supercharger and the compressor based on engine operating conditions.

The present invention provides a heat insulator for vehicle exhaust pipes, capable of greatly shortening ignition time and having excellent heat insulation. The heat insulator (1) is wound around an outer periphery of a vehicle exhaust pipe (2). The heat insulator comprises a deformable sheet-shaped heat insulating material (5) hermetically encased in a reduced pressure state in a bag member (4) comprised of heat-resistant metal foil.

A method for adjusting an air-fuel ratio of an engine is disclosed. In one example, the engine air-fuel ratio is adjusted in response to a duty cycle and frequency of a post catalyst oxygen sensor. The method may improve catalyst efficiency.

Various systems and methods are described for controlling operation of a motor vehicle based on a sensor. One example method comprises receiving sensed parameter data from the sensor, receiving calibration data from the sensor, and adjusting a vehicle operating parameter in response to the sensed parameter data and the calibration data.

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 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 relates to the field of automobile power, and discloses an engine system and a control method. The engine system includes an intake pipeline, an exhaust pipeline and an insulated gas storage tank. The insulated gas storage tank is provided with a first communication port, a second communication port and a third communication port, and the first communication port passes through the first connecting pipe. connected to the intake pipeline upstream of the compressor, the second communication port is connected to the exhaust pipeline between the turbine and the exhaust regulating valve through the second connection pipeline, and the third communication port is connected to the exhaust pipeline through the third connection pipeline. On the exhaust line between the gas regulating valve and the temperature sensor. The invention introduces the low-temperature exhaust gas in front of the three-way catalytic converter into the thermal insulation gas storage tank when the engine is cold started, and can be used as a low-pressure EGR while reducing emissions, reducing fuel consumption, and refilling the three-way catalytic converter stored before the last stop. The high-temperature, low-emission gas is exported to the three-way catalytic converter, the temperature of the three-way catalytic converter is increased, the light-off time is shortened, and the cold start emission is reduced.

The invention discloses a device for shortening three-way catalytic converter light-off time. The device comprises an electrical energy storage unit, an ECU control unit, a turbine, a gas compressor, an intercooler, a three-way catalytic converter and an air inlet bypass pipe; one end of the air inlet bypass pipe is connected to a pipeline between the gas compressor and the intercooler, the other end of the air inlet bypass pipe is connected to a pipeline between the three-way catalytic converter and an exhaust pipe outlet valve. The control method comprises the steps that the three modes of keeping the exhaust gas temperature before the engine stops last time, directly introducing high-temperature compressed air into the three-way catalytic converter, and converting the compressed air into the electric energy through exhaust gas energy and heating the exhaust gas through the electric energy when cold starting is conducted are conducted simultaneously, and therefore the three-way catalytic converter reaches light-off temperature within a short time, and the purpose of improving vehicle cold starting emission is achieved.