146 results about "Heavy duty diesel" patented technology

A piston particularly adapted for heavy-duty diesel engine applications is fabricated from a separate head portion and base portion having circumferentially extending joining surfaces that are heated prior to bonding to an elevated temperature sufficient to enable bonding of the joining surfaces, and thereafter the joining surfaces brought into contact with one another and twisted to attain a permanent metallurgical weld at the interface of the joining surfaces. The head portion has an eccentric combustion bowl and crown. The joined head portion and base portion together form a monobloc piston having a closed gallery which is adapted to receive a cooling fluid, such as oil. The combustion bowl has a substantially uniform bowl sidewall thickness. The piston and method are particularly adopted for use with steel alloys and other high temperature metal alloys.

The invention relates to emission control for a heavy-duty diesel engine. In order to provide a method and a device for achieving the low emission of the heavy-duty diesel engine through controlling exhaust temperature, the invention adopts an exhaust temperature control unit of the engine. The method comprises the following steps of: (1) respectively reading a rotate speed signal from an engine crankshaft sensor and a load signal from an accelerator pedal sensor by the exhaust temperature electric control unit of the engine; (2) controlling exhaust gas temperature according to the judged result of the step (1); (3) adopting an auxiliary heat preservation measure on an exhaust pipe except adopting variable valve actuation (VVA), an electronic throttle, cold air filling and the like to regulate the exhaust temperature; and (4) optimizing the burning process to increase the jet pressure of fuel, and adopting a flexibly variable jet control strategy. The invention is mainly applied to the emission control for the heavy-duty diesel engine.

SAE 0W and SAE 5W multigrade crankcase lubricating oil compositions for heavy duty diesel (HDD) engines meeting the performance requirements of at least one of the API CJ-4; API-CI-4, and/or ACEA A7 specifications, having a sulfated ash content of no greater than 1.0 mass %, a sulfur content of no greater than 0.4 mass %, and a phosphorus content of no greater than 0.12 mass %, formulated with a major amount of oil of lubricating viscosity including less than about 30 mass %, based on the total mass of oil of lubricating viscosity, of Group IV and/or Group V base stock, at least 0.3 mass %, of a non-hydrogenated olefin polymer; and greater than about 40 ppm, of boron.

Method for controlling and improving the transient emissions of an electronically controlled heavy duty diesel engine having an ECM with memory, a turbocharger and an EGR system.

Disclosed are washcoats, coated substrates formed from such washcoats, and catalytic converters for use in diesel applications, such as heavy duty diesel applications. Methods of preparing the coated substrates are also disclosed.

A method to operate a vehicle with an electronically controlled internal combustion engine equipped with an electronic control unit with memory and capable of operating the engine in a cruise control mode.

The present invention is directed to a low sulfur and low phosphorus heavy duty diesel engine lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity and (b) one or more dispersants (c) one or more anti-oxidants and (d) one or more ash-containing detergents, wherein the lubricating oil composition is essentially free of zinc di-alkyl di-thiophosphates and contains no more than 0.175 weight percent sulfur and provided the lubricating oil composition does not contain alkylated and non-alkylated aromatic amines and tri-nuclear molybdenum compounds. The present invention is also directed to a low sulfur and low phosphorus heavy duty diesel engine lubricating oil composition comprising (a) an oil of lubricating viscosity (b) a borated dispersant and a non-borated dispersant (c) a molybdenum anti-oxidant and a phenolic anti-oxidant and (d) a low overbased calcium sulfonate and a high overbased calcium phenate, wherein the lubricating oil composition is essentially free of zinc di-alkyl di-thiophosphates and contains no more than 0.175 weight percent sulfur and provided the lubricating oil composition does not contain alkylated and non-alkylated aromatic amines and tri-nuclear molybdenum compounds. The present invention is also directed to method for lubricating a heavy duty diesel engines, which comprises lubricating the engine with a low sulfur and low phosphorus heavy duty diesel engine lubricating oil compositions of the present invention.

The invention discloses a camshaft bush installation tool of a heavy-duty diesel engine. The camshaft bush installation tool of the heavy-duty diesel engine comprises a pressure lever and a guide sleeve sheathed with the pressure lever, wherein the pressure lever comprises a joint, a plunger chip, and a connecting pipe used for connecting the joint and the plunger chip, the joint is provided with a bush positioning part, and one end of the plunger chip is provided with a backstop bulge and a guide key arranged in a guide key slot extending along the axial direction; and the guide sleeve is internally provided with a guide slot, the pressure lever penetrates in the guide sleeve, and the guide key of the plunger chip extends into the guide slot of the guide sleeve, and is spaced by the backstop bulge. The installation phase and the installation depth of a camshaft bush on the diesel engine can be ensured by virtue of the camshaft bush installation tool of the heavy-duty diesel engine, so that the structure can greatly enhance the installation precision of the camshaft bush on the diesel engine, reduce the repeated operation and the camshaft bush scraped due to the poor installation precision of the camshaft bush, reduce the production cost and enhance the production efficiency.

A heavy-duty diesel engine split type rocker arm brake mechanism for a commercial vehicle comprises a rocker arm body, a swing mechanism and a hydraulic drive system; the rocker arm body is mounted on a rocker arm shaft through a main mounting hole, the swing mechanism comprises a swing head, a first adjusting bolt and a rolling column, the swing head is mounted on the rocker arm body, a sheet-shaped spring is arranged at the bottom of the swing head, and is pressed on the bottom of the rocker arm body, a ball head of the first adjusting bolt is mounted in a ball socket in an elephant foot shape, the hydraulic drive system comprises a hydraulic plunger with a return spring sleeved, a second adjusting bolt in contact with the hydraulic plunger and a rocker arm cam in threaded connection with the hydraulic plunger, the hydraulic plunger is mounted in a drive cavity of the rocker arm body, the rocker arm cam makes contact with the rolling column, a brake hydraulic oil way communicated with the main mounting hole, the drive cavity and a swing arm shaft hydraulic oil hole is arranged in the rocker arm body, and the heavy-duty diesel engine split type rocker arm brake mechanism is high in reliability, low in cost, high in lightweight degree, simple in structure, convenient to assemble and maintain and good in brake effect.

A lubricating oil composition for internal combustion engines, particularly heavy duty diesel (HDD) engines, having reduced phosphorus, sulfur and sulfated ash contents that provide excellent piston cleanliness performance and contain an amount of phenate detergent that introduces a relatively large amount of phenate soap into the lubricating oil composition.

A fuel system of a heavy-duty diesel engine comprises an oil tank, a low-pressure oil conveying pump, a fuel filter and a fuel injector assembly, wherein an automatic exhaust three-way valve is arranged on a base of the fuel filter, an inlet of the automatic exhaust three-way valve communicates with an oil outlet of the oil tank through a first oil path and the low-pressure oil conveying pump sequentially, a first outlet of the automatic exhaust three-way valve communicates with an oil inlet of the low-pressure oil conveying pump through a second oil path, the fuel ejector assembly and a fuelreturn pipeline, and a second outlet of the automatic exhaust three-way valve communicates with an oil inlet of the oil tank through an exhaust pipeline. Through the design, automatic exhaust of the engine in the running state is achieved, the filtering efficiency of the fuel filter is improved, and the service life of a prefilter is prolonged.

The invention discloses a CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization. The CO2 Rankine cycle system is a special CO2 Rankine cycle system with CO2 serving as a working medium, waste heat of diesel engine high-temperature flue gas serving as a heat source, and a waste heat driving absorption refrigeration product of diesel engine cooling system hot water serving as a cold source. The CO2 Rankine cycle system is mainly composed of a flue gas waste heat exchanger, CO2 turbines, power equipment, a regenerator, a condenser, a high-pressure pump, a flue gas water heater and an absorption refrigerator. The characteristic that the condensation enthalpy of the CO2 working medium near the critical point is reduced is skillfully utilized; and the efficiency of conversion of heat into power is higher than that of an ORC cycle or other cycles and is obtained through a special cascade stage combined cycle formed by high and low grade waste heat, so that the fuel oil use ratio of a diesel engine is increased by 18%-25% or above. The CO2 Rankine cycle system for heavy-duty diesel engine waste heat gradient utilization is capable of achieving waste heat power generation/driving, heat supply and refrigeration poly-generation and has remarkable economic benefits, social benefits and application prospects.

The invention provides a particulate matter removing device of a marine heavy-duty diesel engine EGR system and relates to the technical field of internal combustion engines. The particulate matter removing device comprises a conical turbine air outlet pipe, a shuttle containing cavity, screw blades, an EGR pipeline and an EGR valve. The conical turbine air outlet pipe, the shuttle containing cavity and a rear exhaust pipe are sequentially connected. The screw blades are arranged in the conical turbine air outlet pipe to form a helical duct through a screw blade fixing support. An air inlet of the EGR pipeline is formed in the shuttle containing cavity, an air outlet of the EGR pipeline is formed in a front air inlet pipe. Clean tail gas can be used as an air source of the EGR system, and pollution of particulate matter to a gas compressor and an engine air inlet system is reduced. The particulate matter removing device is reasonable in design, simple in structure, and suitable for EGR low pressure loop connection methods.

The invention relates to a non-automotive heavy-duty diesel engine SCR (semiconductor control rectifier) device and method. The non-automotive heavy-duty diesel engine SCR device comprises a reactor in which a catalyst is arranged; a measuring unit which is connected with a system control device is arranged at an exit of the rear end of the catalyst in the reactor; the system control device is connected with a spray gun through a urea solution control device; an exit end of the spray gun is arranged at a front end of the catalyst in the reactor; the measuring unit comprises at least an NOX (nitric oxide) measuring unit; the urea solution control device comprises a urea pump and a urea tank which is connected with the urea pump, and a spraying device which is connected with the urea pump; the spraying device comprises at least two one-way valves which are connected with an air compressor and the urea pump respectively; the system control device is connected with a urea pump signal control end so as to output a urea solution output signal; and the spraying device is connected with the spray gun. The device provided by the invention is provided with the spraying device and the air compressor so as to solve the problem of uniformly mixing large capacity of urea water solution with tail gas and the problem of uniform diffusion of the mixed urea water solution and the tail gas passing through the catalyst.

The invention relates to iron-tungsten-titanium composite oxide catalyst. The catalyst has the chemical composition of FeWaTiOx, wherein a is greater than 0 and less than or equal to 1.6. The invention further discloses a preparation method of the catalyst, which comprises the following steps: (1), preparing the solutions of Fe source, W source and Ti source in the presence of oxalic acid, and mixing the solutions of Fe source, W source and Ti source to obtain a mixed solution; and (2), adding excessive urea precipitation agent into the mixed solution to ensure that ions can be fully deposited, and carrying out suction filtration, washing, drying and baking to obtained sedimentation products to obtain the iron-tungsten-titanium composite oxide catalyst. Compared with iron-tungsten-titanium composite oxide catalyst without adulteration, the iron-tungsten-titanium composite oxide NH3-SCR catalyst has an obviously improved high-temperature thermal stability, and is easier to apply to catalysis and decontamination of NOx in heavy duty diesel exhaust.

The invention relates to an active oil-gas separator which is characterized in that the upper end of a base assembly is fixedly connected with an upper shell assembly, a sealing ring is arranged at the joint of the base assembly and the upper shell assembly, an inner cavity of the base assembly is an oil return cavity, a gas outlet cavity assembly is assembled at the lower end of an inner cavity of the upper shell assembly, a driving shaft assembly is vertically arranged in a cavity formed by the base assembly and the upper shell assembly, an auxiliary separating impeller is arranged on the portion of the driving shaft assembly positioned in the base assembly, an engine oil spraying hole is formed below the driving shaft assembly, a lamination lower body, a lamination and a lamination upper body sleeve the portion of the driving shaft assembly positioned in the upper shell assembly from bottom to top, the lamination lower body is limited by a limiting spring, the lamination upper body is limited by a clamping spring, a pressing plate is arranged in a side cover above the upper shell assembly, a diaphragm is arranged at the pressing plate, the maximum gap is kept between the diaphragm and a gas outlet, and the diaphragm is supported by a pressure adjusting valve spring. The active oil-gas separator can solve the problems that the overall engine performance and reliability of medium-duty and heavy duty diesel engines are reduced after a closed crankcase ventilation system is used.

The invention discloses a cylinder sleeve and a surface treatment method of the inner hole of the cylinder sleeve, and belongs to the field of manufacture of an internal combustion engine and parts thereof. The cylinder sleeve is prepared from a multicomponent low-alloy cast iron material which contains Cr, Mo, Cu and Ni; the inner surface of the cylinder sleeve comprises a hardened layer and a sulfurized layer, wherein the hardened layer is positioned at an inner side, and the sulfurized layer is positioned on a surface; the hardness of the hardened layer is 46-50HRC, and the thickness of the hardened layer is 0.4-2.6 mm; the thickness of the sulfurized layer is 0.001-0.005 mm, and the friction coefficient of the surface of the hardened layer is less than or equal to 0.05. The surface treatment method comprises the following steps of: carrying out quenching treatment and finish machining on the surface of the inner hole of the cylinder sleeve, and then carrying out sulfidization treatment. According to the cylinder sleeve produced by adopting the surface treatment method, the outer layer of the inner surface of the cylinder sleeve is the sulfurized layer which has an anti-friction effect, and the inner layer is an anti-abrasion layer which comprises acicular martensite and A type graphite and has higher hardness. The cylinder sleeve produced by adopting the surface treatment method can shorten the seating time of the cylinder sleeve, prolong the service life of the cylinder sleeve and is especially suitable for medium-duty and heavy-duty diesel engines.

The invention relates to a novel portable type diesel vehicle tail gas particulate road detection device and a method. The novel portable type diesel vehicle tail gas particulate road detection device comprises a DPF (diesel particulate filter), a radio frequency generator, a radio frequency receiver, an integrated control system device and a display device, wherein a filter body is arranged in the DPF; the radio frequency generator and the radio frequency receiver are respectively connected with the integrated control system device, and the integrated control system device is connected with the display device; specifically, the integrated control system device is used for performing Fourier transformation on a signal received by the radio frequency receiver, and converting to obtain energy spectrum, so as to obtain resonance frequency; the obtained resonance frequency is found according to a function relationship of preset radio frequency resonance frequency and carbon content, so as to obtain value of carbon loading amount in the DPF. The novel portable type diesel vehicle tail gas particulate road detection device has the advantages that the content of carbon smoke particles in the diesel vehicle tail gas can be accurately measured, the device can be used for a traffic management department to detect whether the content of the particulate in the heavy-duty diesel vehicle tail gas exceeds standard or not in the road detection process, the device is cooperated with the issuing of national standard VI, and the emission standard of diesel vehicle particulate is further standardized.

Disclosed is a method for improving the fuel economy of a heavy duty diesel engine which produces a heavily sooted lubricating oil composition during the engine's normal operation. The method involves introducing lubricating the heavy duty diesel engine with a heavy duty diesel engine lubricating oil composition comprising (a) a major amount of an oil of lubricating viscosity; and (b) a minor effective amount of an ashless friction modifier comprising a reaction product of a C₄ to about C₇₅ fatty acid ester and a mono- or dialkanolamine.

The present invention is directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil composition for low emission heavy duty diesel engines comprising (a) a major amount of an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil. The present invention is also directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil concentrate comprising (a) an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil.