6results about How to "Improve cold start performance" patented technology

This utility model discloses an engine cylinder head and its electronic fuel injection system, including a cylinder head body. The cylinder head body has an intake manifold, an exhaust manifold, and a connecting surface for connection and mating with the engine block. The cylinder head body has a fuel jet channel communicating with the intake manifold. A cylinder head fuel jet clearance groove is provided on the inner wall of the intake manifold near the inner end of the fuel jet channel. An intake valve is installed on the cylinder head body, with its valve head installed in an intake valve seat hole. An intake pipe is installed on the cylinder head body on one side of the intake manifold. An injector seat is provided on the intake pipe, and an injector mounting hole communicating with the fuel jet channel is provided on the injector seat. An injector is installed in the injector mounting hole, and the linear distance between the injector nozzle and the center of the valve head is 70mm to 110mm. By precisely defining the position and mating relationship between the components, the overall performance of the engine is maximized.

The invention relates to a dual-module intercooler type fuel cell cathode inlet temperature and humidity cooperative control method. The method comprises the steps that fuel cell cathode air inlet real-time state parameters and operation parameters are obtained, a multivariable coupling prediction model is constructed after preprocessing, and a temperature and humidity reference and an oxygen stoichiometric ratio target reference are set in combination with heat exchange characteristics of a dual-module intercooler; then the core body heat exchange distribution proportion is regulated and controlled, humidification adjustment is matched, and the core body heat exchange distribution proportion and the humidification adjustment intensity are dynamically adjusted according to the real-time working condition; comparing the deviation between the adjusted actual temperature and humidity and the target temperature and humidity reference, and correcting the heat exchange distribution proportion and the humidifying adjustment parameter through a dynamic constraint correction model; cooperative regulation and control of cathode inlet temperature and humidity are realized, dynamic change of working conditions is adapted, and stable operation of the fuel cell is guaranteed.

This invention relates to the field of engines, providing an engine intake air preheating method, system, device, and engine. The method includes: acquiring ambient temperature and atmospheric pressure values ​​after the engine is powered on; if the ambient temperature is less than 0 degrees Celsius, heating the air entering the engine through a heating rod, and injecting fuel onto the surface of the heating rod based on a pre-constructed MAP map; after starting the engine, acquiring the engine speed, and if the engine speed is higher than a first set speed, completing the engine intake air preheating. This invention addresses the shortcomings of existing diesel engines in cold starts at high altitudes, enabling the minimum intake air preheating power to adaptively adjust with engine speed, altitude, and ambient temperature during diesel engine startup. It supplements the deficiencies of existing design methods and improves the environmental adaptability of diesel engines.

The application provides a high-compression-ratio ethanol fuel gasoline engine combustion system and a control method thereof, wherein the system comprises: a high-compression-ratio combustion structure with a compression ratio of 14-15, the combustion structure comprises a piston top with an omega-shaped shallow pit structure, and the surface of the piston top is provided with a silicon nitride ceramic coating; a cold start enhancement system comprising a PTC ceramic heating module and a high-energy ignition device; a fuel injection system comprising a high-pressure common rail system and a multi-hole swirl oil injector; and a control system comprising an ECU control unit and a UEGO wide-range oxygen sensor. The high-compression-ratio ethanol fuel gasoline engine combustion system and the control method thereof can realize high thermal efficiency, reliable start at low temperature, stable combustion and low emission.

The invention discloses a cooperative control method for a glow plug and a fuel injection quantity in a cylinder in a cold starting process of a diesel engine, which relates to the technical field of cold starting of diesel engines and comprises the following steps: firstly, judging a cold starting condition, and calculating the fuel injection quantity required by the glow plug according to a starting stage (an injection starting period / Ramp period); secondly, through iterative calculation, the final oil injection quantity of the glow plug and the air inlet oxygen content decline value caused by the final oil injection quantity are synchronously determined, and then the effective oxygen mass capable of being used for in-cylinder combustion is obtained; and finally, accurately calculating and executing the in-cylinder fuel injection quantity after collaborative correction according to the effective oxygen mass. According to the method, dynamic accurate matching of the preheating process and the oil injection process is achieved, the first-time starting success rate and the starting speed of the low-compression-ratio and high-supercharge-ratio diesel engine in the low-temperature environment are remarkably increased, and smoking and pollutant emission in the cold starting stage are effectively reduced.

The invention provides a light diesel engine tail gas after-treatment system and a control method thereof, which can solve the problems of high cold start emission, catalyst poisoning caused by HC, N2O generation and difficulty in reaching the standard of PN10 emission in the prior art, meet the requirements of a new generation of emission regulations, and improve the emission efficiency. Comprising a ccDOC unit, a first urea injection unit, a ccSCR unit, a DPF unit, a second urea injection unit, a second SCR unit and an ASC unit which are sequentially arranged in the tail gas direction of an engine. The controller is electrically connected with the first urea spraying unit and the second urea spraying unit; and the controller controls the first urea injection unit to inject a first urea amount U1 into the tail gas in front of the ccSCR unit and controls the second urea injection unit to inject a second urea amount U2 into the tail gas in front of the second SCR unit according to a preset control method.