469 results about "Diesel locomotive" patented technology

The invention discloses a method for manufacturing a bevel gear of an axle gear box for diesel locomotives, which comprises the steps of blank forging, blank heat-treatment, gear-blank processing, gear-shape processing, gear-end processing, gear-surface heat-treatment, precise reference modification and gear-shape finish-machining, wherein the step of blank heat-treatment comprises the sub-steps of normalizing and thermal refining; the step of gear-blank processing comprises the sub-steps of rough turning and finish turning; the step of gear-shape processing comprises the sub-steps of gear milling, gear hobbing or gear shaping; the step of gear-surface heat-treatment comprises the sub-steps of nitriding, surface quenching and tempering; the step of precise reference modification comprises the sub-steps of end face modification and centre hole modification; and the step of gear-shape finish-machining comprises the sub-steps of gear grinding and polishing. By using the method disclosed by the invention, the production efficiency of the bevel gear can be improved, and the consumption amount and production cost of raw materials can be reduced; and meanwhile, the method is simple in process, and the manufactured bevel gear is long in service life.

The double-metal exhaust gate for diesel engine of diesel locomotive is manufactured with super Fe-Ni alloy comprising C 0.04-0.15 wt%, Si 0.40-1.20 wt%, Mn 0.50-1.0 wt%, Cr 20.0-24.0, Ni 30.0-40.0 wt%, Ti 2.5-3.0 wt%, Al 0.60-1.20 wt%, Nb 0.40-1.20 wt%, V 0.01-0.20 wt%, W 0.60-0.80 wt%, B 0.01-0.04 wt%, Mg 0.01-0.04 wt%, Ce 0.005-0.08 wt%, Co 0.5-1.0 wt%, Mo 0.15-0.30 wt% and Cu 0.05-0.30 wt% other than Fe. The gate material has good performance and machinability, stable quality and high performance / cost ratio.

A bonnet captures exhaust gases from the exhaust pipes of diesel-powered locomotives. The bonnet includes a shell with a compliant fender. One or more of the bonnets are positioned over the exhaust pipe or pipes of the locomotive and are secured to the exhaust pipes or to a top surface of the locomotive. The bonnets are connected to a manifold, and the manifold carries the exhaust gasses to an Emissions Control Unit (ECU) for processing. The bonnets enclose a volume above and / or around the exhaust pipes and the compliant bumper closes against the internal or external surface of the exhaust pipe or pipes or against the top surface of the locomotive surrounding the exhaust pipe or pipes. The closing prevents or limits outside air from entering the bonnet and the exhaust gases from being emitted to the atmosphere.

The invention relates to an internal combustion engine waste heat temperature difference electric conversion generation system, which comprises an engine, an exhaust main pipe, a side branch pipe, a flue gas heat exchanger inlet, a flue gas heat exchanger outlet, a silencer, an electrode connecting wire, an electric device, a battery, a circulating water heat exchanger inlet and a circulating water heat exchanger outlet, wherein a temperature difference generating device is arranged between an exhaust port and the silencer of a diesel locomotive, an engine exhaust pipe is divided into the exhaust main pipe and the side branch pipe, the exhaust main pipe is connected with the temperature difference generating device, a flue gas heat exchanger and the flue gas heat exchanger inlet, and the waste heat which is discharged by an internal combustion engine is used as a heat source, circulated cooling water is used as a cold source, thereby doing temperature difference thermoelectric conversion. The internal combustion engine waste heat temperature difference electric conversion generation system has the beneficial effects that a part of power is used to supply power for the electric device of a locomotive, residual parts charge for the battery of the locomotive, thereby being capable of replacing an engine of the locomotive itself, and being capable of saving about 5 percent of fuel oil.

A cooling system including an intake air cooling subsystem and a liquid cooling subsystem for controlling intake air temperatures in a supercharged internal combustion diesel locomotive engine. The intake air cooling subsystem includes an air-to-water aftercooler and an air-to-air aftercooler having intake air sides connected to receive intake air flow in series between a supercharger and an engine. The liquid cooling subsystem includes at least one liquid cooling loop having a pump, a radiator and a water coolant side of the air-to-water aftercooler. At least one shared fan circulates air flow to the cooling air sides of the air-to-air aftercooler and the radiator. An optional air distribution control selectively directs circulated air flow between the air-to-air aftercooler, the radiator and other optional components of the cooling system.

A cooling system including an intake air cooling subsystem and a liquid cooling subsystem for controlling intake air temperatures in a supercharged internal combustion diesel locomotive engine. The intake air cooling subsystem includes an air-to-water aftercooler and an air-to-air aftercooler having intake air sides connected to receive intake air flow in series between a supercharger and an engine. The liquid cooling subsystem includes at least one liquid cooling loop having a pump, a radiator and a water coolant side of the air-to-water aftercooler. At least one shared fan circulates air flow to the cooling air sides of the air-to-air aftercooler and the radiator. An optional air distribution control selectively directs circulated air flow between the air-to-air aftercooler, the radiator and other optional components of the cooling system.

The invention relates to a fatigue service life estimation method for a gas engine which includes the follows: firstly selecting the key devices for estimating the fatigue service life of the gas engine; then selecting a variable which affects the fatigue service life of each key device; obtaining the needed variable value by collecting relevant data; working out the injury tolerance of each key device by utilizing a Miner rule in a fatigue accumulation injury theory; when the value is equal to 1, considering the devices to reach the fatigue service life and need to be overhauled. The integral fatigue injury tolerance for the gas engine is equal to the fatigue injury tolerance of each key device multiplied by the sum of the corresponding weight coefficients; when the value is larger than 1, then the engine is considered to reach the fatigue service life and need to be heavily repaired. Finally an estimation result is led to approach the actual injury situation of the engine by correcting the weight coefficients, thus being used as a basic for confirming the heavy repair period of the engine. The invention is different from the traditional method which uses the running kilometrages and the equivalent kilometrages to confirm the period for the heavy repair of the engine and essentially reflects the injury situation of the gas engine; so the reliability of the estimation result is higher.

The invention discloses a control method for frequency-conversion starting of a diesel engine by utilizing a synchronous generator in an alternating-current diesel locomotive. The control method comprises the following steps of carrying out no-load pre-excitation according to a calculated no-load exciting current ifb; judging whether an exciting current reaches ifb, if the exciting current does not reach ifb, returning and continuously carrying out the pre-excitation; otherwise, carrying out initial positioning according to a preset initial position angle; judging whether the initial positioning is finished, if the initial positioning is finished, selecting a torque command curve according to a preset starting time; otherwise, returning and continuously positioning; carrying out torque loop control according to the torque command curve; judging whether the rotating speed of a motor reaches a preset ignition speed, if the rotating speed of the motor reaches the preset ignition speed, stopping the motor; otherwise, returning and continuously controlling. According to the control method, an air-gap field control strategy, in which the power factor is accurate to 1, of the synchronous generator is realized, and meanwhile, by designing an off-line calculation method for planning the torque command curve according to a preset starting finishing time, the output current of the motor required in a starting system is better optimized.

The invention discloses a diesel locomotive auxiliary engine control device, which comprises a CPU, a power circuit, a crystal oscillator circuit, a differential filter circuit, a communication circuit, an overvoltage protection circuit and a drive circuit, wherein the power circuit provides power for the auxiliary engine control device; the crystal oscillator circuit is connected with the CPU and provides clock pulses for the CPU; the communication circuit is connected with the CPU, performs network communication with a control and display device on the locomotive through a serial port, and downloads a control program; the auxiliary engine outputs voltage feedback, the input DC voltage is converted into small-signal DC voltage through the differential filter circuit, and the feedback voltage is transmitted to an inner analog-digital converter of the CPU; the overvoltage protection circuit is connected with the CPU, and the auxiliary engine is made to output stable voltage by adjusting exciting current; and the drive circuit is connected with the CPU and drives the exciting current. The invention solves the technical problems of larger volume, installation space occupancy, larger deviation of parameters of analog devices, and susceptibility to multiple kinds of interference in the prior art.

The invention discloses a method and a device for testing a microcomputer control system of a diesel locomotive. A CAN bus or a serial bus is used for communication with an host computer to receive a test command from the host computer, and an inter CAN bus is used to receive the test command and transmits the test command to internal signal generation modules which generate a corresponding test signal according to the test command and transmit the test signal to equipment to be tested through an adapter cable; a signal detection module of a testing device detects an output signal of the equipment to be tested and transmits the output signal to a CPU board through the CAN bus, and the CAN bus or serial bus transmits the output signal to the host computer; and the host computer compares a given signal with the detected signal to realize the fully automatic closed loop test of the equipment to be tested. The fully automatic closed-loop test is a fully automatic loop test of the equipment to be tested which is implemented in a way that: the inside of the testing device adopts a distribution type module based on the CAN bus, the CPU board is connected with a digital quantity input and output board, a frequency board, a constant-current source board and a DA board through the internal CAN bus, and the testing device uses the external CAN bus or serial bus of the CPU board to communicate with the host computer and to realize the automatic circulating test of the equipment to be tested.

A diesel locomotive engine having a piston with a unique bowl geometry. The bowl is defined in part by a center portion having a partial spherical shape. A cone portion (22) is located adjacent the central portion. An annular toroidal surface (24) is connected to the cone portion (22) and is defined by a toroidal major diameter (Dtm) and a toroidal minor radius (Rtm). A crown rim (26) is connected to the annular toroidal surface (24) and to an upper flat rim face of a sidewall.

The invention relates to the technical field of a diesel locomotive engine, and particularly relates to a method for repairing a cam axle hole of a diesel engine. The method comprises a micro-grinding repair technology and a regrinding deformation repair technology. The micro-grinding repair technology mainly adopts an electric brush plating technology or a welding technology; the regrinding deformation repair technology comprises the following steps of fixing, aligning, boring, sleeve preparing and sleeve packing. By adopting the repair technology method, the coaxiality of the cam axle hole of the machine body and maintenance quality of the aperture can be obviously improved, and an operation fault of a diesel engine is reduced. As for the machine body with severely deformed cam axle hole, by adopting the repair technology method, the scrapping of the machine body can be avoided; and the service life is prolonged, and obvious economic benefits are obvious.

The invention relates to the technical field of diesel locomotives, in particular to an ice and snow removing locomotive. The ice and snow removing locomotive comprises a locomotive body, a first cab, a second cab, line snow removing devices, an auxiliary room, a cooling room, an electric room, a power room and an ice removing pantograph. The first cab is arranged at one end of the locomotive body, the second cab is arranged at the other end of the locomotive body, the line snow removing devices are arranged below the first and the second cabs, the auxiliary room is arranged on one side of the second cab, the cooling room is arranged on one side of the auxiliary room, the electric room is arranged on one side of the first cab, the power room is arranged on one side of the electric room, and the ice removing pantograph is arranged between the electric room and the power room. The ice and snow removing locomotive is an ice and snow removing device which has the advantages of simple, compact and reasonable structure, convenience and quickness in assembly, reliability in connection and strong maintenability. The ice and snow removing locomotive quickly and effectively removes sleet from a contact network and snow on lines, between steel rails and on two sides of a steel rail, achieves greatly improved working reliability, fills the gap in research on dedicated ice and snow removing locomotives at home and abroad, and is easy to use and popularize.

The invention discloses a method for repairing and processing a main bearing cap of a diesel engine body of a diesel locomotive, which comprises a method for realizing the repairing and processing of a bearing hole of an original main bearing cap of a diesel engine body by a common boring mill and a repairing and processing method which uses a semi-manufactured main bearing cap to replace the bearing hole of the original main bearing cap. When the method is applied to the repairing and processing operation of the diesel locomotive, the diesel engine body and the main bearing cap are separated, the bearing hole of the main bearing cap is separately processed by means of accurate measurement and reasonable processing technology, the processing of the bearing hole is completed by the common boring mill instead of large-scale equipment, so the current situation that the main bearing cap can be processed by large-scale equipment only after being assembled with the engine body in the past is changed, the quality of repairing and processing is improved fundamentally, the work efficiency is high, the cost is low and the scope of application is wide, thereby realizing the purpose of repairing the main bearing hole of the large-scale engine body by the common machine tool. The invention has the repairing cost which is only 3 percent of the processing cost of the large-scale machine tool, thereby having considerable economic benefit.

The invention provides an integrated power source for providing power for a diesel locomotive auxiliary transmission system and a train. The integrated power source comprises a main generator and an AC-DC main rectifying circuit. The DC output component of the AC-DC main rectifying circuit provides power for a traction motor through a traction circuit switch and a traction inversion module. The DC output component of the AC-DC main rectifying circuit provides power for the diesel locomotive auxiliary transmission system and the train through a DC-DC chopping set-down module, a DC-AC inversion module, an isolation transformer and an AC-DC auxiliary rectifying module in sequence. Neither extra auxiliary generator nor diesel generating set for power supply is needed, the weight of a shaft is reduced, and space is saved. The number of current transformer components is reduced, cost is reduced, and system reliability is improved. Feedback power of resistance braking can be utilized, and the total power of a locomotive can be freely distributed to the traction power, the auxiliary power and the train power supply power. When the traction power does not need to be output, input of the traction inverter can be cut off, and reliability and safety are improved.

The invention discloses a fuel oil additive, which comprises the following components: 0.1 to 99.8 percent of dialkyl carbonate, 0 to 80 percent of ferrocene, 0 to 80 percent of benzotriazole, 0.1 to 80 percent of fatty alcohol and epoxyethane condensation compound, 0.05 to 50 percent of alkylphenol and epoxyethane condensation compound, and the like. The fuel oil additive can be widely used in gasoline of all grades, diesel oil, ethanol blended gasoline, biodiesel and heavy oil for various motor vehicles, marine diesel engines, diesel locomotives, industrial oil burning boilers and the like. The fuel oil additive has the advantages of improving the quality of fuel oil, increasing combustion efficiency, obviously saving oil, reducing harmful tail gases, strengthening the power of engines, protecting the engines, prolonging the service life of the engines, along with cleanness, no toxicity, small addition amount.

An auxiliary engine warming system for a primary engine in a diesel locomotive including: a modular engine assembly including an auxiliary diesel engine, the assembly displaceable as a unit from and to a frame for the engine warming system; an auxiliary fuel tank including a fuel line detachably connected to the auxiliary engine and including a first fitting detachably connectable to a first fuel line for a fuel tank for the diesel; at least one temperature sensor interfacable with the diesel locomotive and arranged to monitor at least one temperature condition for the diesel locomotive; and an emergency dialer for automatically dialing a preprogrammed number and transmitting an alert message in response to an alarm signal from the at least one temperature sensor.

A service data recording device for a diesel locomotive comprises a main-control component, a communication component, a signal acquisition and output component, a drive lamp display component and a power component, wherein the main-control component is used for realizing the logic control of locomotive data collecting, and the function of data logging, dumping and communication; the communication component comprises an RS422 / 485 serial port circuit, an RS232 on-line debugging communication circuit, an Ethernet interface and a USB interface circuit; the signal acquisition and output component comprises 16 quantity value acquisition circuits, 2 voltage-mode analog quantity acquisition circuits and 2 current-mode analog quantity acquisition circuits, 2 frequency signal acquisition circuits, an analog quantity output circuit and 4 digital quantity output circuits; the drive lamp display component is used to display the running state of the data logging device; and the power component is used to provide power supply for the above-described circuits or components. The invention has the advantages of simple and compact structure, low cost, and simplicity and convenience in operation, greatly improves the product reliability and flexibility, and enlarges the application range by configuration.

The reinforcing air intake valve for diesel engine of diesel locomotive is manufactured with reinforced martensite steel comprising C 0.38-0.50 wt%, Si 2.50-3.75 wt%, Mn less than or equal to 0.80 wt%, Ni less than or equal to 0.50, Cr 8.5-11.0 wt%, S less than or equal to 0.002 wt%, P less than or equal to 0.003 wt%, Mo 0.2-0.3 wt% other than Fe. The gate material has good performance and machinability, stable quality and high performance / cost ratio. The gate after heat treatment has high strength, excellent comprehensive performance, high roughness and good fitting with plastic.

The invention discloses a simple diagnostic unit for assisting the fast fault detection of an electric control system of a diesel locomotive. The diagnostic unit is provided with nine interfaces which are respectively connected with an ECU (Electric Control Unit) of a whole vehicle to be detected. A simulation whole vehicle fault diagnosis communication interface, a whole vehicle execution load simulator, a whole vehicle load meter indication simulator, a signal detection interface, an accelerator change-over switch and the like are respectively connected with an electric control circuit interface in the ECU. The fault diagnosis communication interface can output dynamic curve of engine working parameters and fast judge the fault information and fault parts. The diagnostic unit provides associated load to simulate the running environment of the whole vehicle to be detected, and a fault point transmits a state parameter to the ECU so that the ECU activates a corresponding fault code to flicker. By observing an error flicker code transmitted by a fault display, the fault part of the present running engine can be known; meanwhile, the fault code can be stored in a memory. The invention breaks away from the complicated whole vehicle wire harness and electric appliances, rapidly distinguishes that fault occurs to the whole vehicle electric control system or the engine electric control system.

The invention discloses a regenerating unit and method of a self-evaporating diesel particle trap with the advantages of fuel and steam premixing and swirling flow combustion. The regenerating device of the diesel particle trap is arranged in the middle of an exhaust pipeline of a diesel powered vehicle. The device comprises a combustor, a fuel supply system, an air supply system, an exhaust pressure monitoring and controlling system and an igniting system which are respectively connected with an electronic control system, wherein the electronic control system comprises a control chip; an exhaust check valve is respectively arranged on the exhaust pipeline and controlled by the electronic control system. The regenerating method of the regenerating unit of the diesel particle trap comprises the following steps of: stopping exhaust; primarily igniting; secondarily heating; and regenerating the diesel particle trap. The fuel steam and pressurized air are premixed and fully combusted, andthe diesel particle trap is uniformly heated through a rotary fire field to rapidly reach the particle combusting temperature to ensure that particles in the diesel particle trap are combusted, so that the purpose of regenerating the diesel particle trap is achieved.

The invention relates to the technical field of a diesel locomotive, and particularly relates to a diesel locomotive for direct power supply passenger transport of a train. The locomotive is divided into an upper part and a lower part; the locomotive body at the upper part is divided into six chambers by five partition walls; the six chambers respectively are a first cab, an electric room, a power room, a cooling room, an auxiliary room and a second cab orderly arranged from front to back; steering bogies are arranged at two ends of the lower part; a fuel tank is arranged in the middle; a storage battery and a main air reservoir are arranged on the fuel tank; and the front steering bogie and the rear steering bogie at the lower part adopt suspended high-speed bogies. The diesel locomotive for direct power supply passenger transport of the train adopts a dual-cab structure, is integrated with two sets of direct power supply systems for passenger trains; one set of power supply system is in primary and auxiliary power generators which are in coaxial serial arrangement, and the auxiliary power generator provides 400kW of power supply output power to the auxiliary train; the other set of power supply system is an independent power supply diesel generating set, and also can provide 400kW of power supply output power; and the maximal power supply output power of the entire locomotive can achieve 800kW. The diesel locomotive disclosed by the invention is high in reliability, good in economical efficiency, and strong in applicability.

The invention relates to a centrifugal magnetic filter. The filter mainly comprises a cylindrical pipe body, wherein a spiral pipe is arranged on the front part of the pipe body; a spiral rib which spirally extends along the axis of the pipe body is arranged on the pipe wall of the spiral pipe; a magnet is attached outside the pipe wall of the spiral pipe; a filter screen is arranged behind the spiral pipe; the outer edge of the filter screen is attached to the pipe body; and an impurity discharge pipe is arranged on the pipe body between the outer edge of the filter screen and the spiral pipe. Impurity particles in cooling liquid are subjected to the action of centrifugal force and close to the pipe wall under the spiral guide action of the spiral rib, and a cone-shaped filter screen filters impurities in the cooling liquid; a filter screen is not arranged in a central area of the cone-shaped filter screen, so that the flowing cooling liquid cannot be subjected to resistance; and the cone-shaped filter screen is subjected to the scouring action of the cooling liquid, so that the filter cannot be easily blocked by the impurities in the cooling liquid, and the cooling liquid flows smoothly in the filter. The centrifugal magnetic filter is suitable for filtering cooling water of a diesel locomotive and other large traffic vehicles.

An auxiliary engine warming system for a primary engine in a diesel locomotive including: a modular engine assembly including an auxiliary diesel engine, the assembly displaceable as a unit from and to a frame for the engine warming system; an auxiliary fuel tank including a fuel line detachably connected to the auxiliary engine and including a first fitting detachably connectable to a first fuel line for a fuel tank for the diesel; at least one temperature sensor interfacable with the diesel locomotive and arranged to monitor at least one temperature condition for the diesel locomotive; and an emergency dialer for automatically dialing a preprogrammed number and transmitting an alert message in response to an alarm signal from the at least one temperature sensor.

The invention discloses a diesel vehicle low emission control device and method. The diesel vehicle low emission control device comprises an oxidation catalyst (1), a diesel particle catcher (2), a first exhaust temperature sensor (6), a second exhaust temperature sensor (5), an electric heating device (3), a differential pressure sensor (7) and an electronic control device (4). The oxidation catalyst is integrated with an electric heating wire of the electric heating device and encapsulated and formed with the diesel particle catcher, the first exhaust temperature sensor is installed at the front end of the oxidation catalyst, and the second exhaust temperature sensor is installed between the oxidation catalyst and the diesel particle catcher. The differential pressure sensor is connectedto the two ends of the diesel particle catcher. The first exhaust temperature sensor, the second exhaust temperature sensor and the differential pressure sensor are connected with the electronic control device. According to the diesel vehicle low emission control device and the method, the exhaust temperature can be raised, the conversion rate of NOX, HC and CO is improved at the low temperatureafter treatment, regeneration of PM particles is controlled, and the purposes of reducing energy consumption and calibrating the development work amount are realized.

A smoke generating unit for a model vehicle controls and varies the rate at which smoke is generated by controlling power to a heater. The model vehicle is electrically driven, and the smoke-generating unit is configured to emit smoke so as to mimic varying emission from a traditionally-fueled vehicle, such as a steam-driven or diesel-driven vehicle. Smoke is generated in proportion to power supplied to the heater. A controller controls the power as a function of various control inputs, such as vehicle engine load, vehicle speed, or user input. Temperature or power feedback may be used as input for a closed-loop control process. A blower for the fan may be controlled via an analog circuit in response to velocity or load input to simulate a steam or diesel locomotive.

The invention discloses a single-unit eight-axle electric transmission shunting diesel locomotive. The locomotive is divided into an upper part and a lower part; the upper part is a car body with a frame, two ends of the lower part are bogies which include two B0-B0 four-axle bogies, and each of the two B0-B0 four-axle bogies is formed by that two B0 two-axle bogies and a transition frame are connected by rubber pads, and the transition frame is arranged at the middle above the two B0 two-axle bogies; and the car body is connected with the B0 two-axle bogies through a transition device. The single-unit eight-axle electric transmission shunting diesel locomotive has the advantages that the transition capacity is high; parts have good generality, the maintenance is convenient, and the locomotive maintenance cost is reduced; the locomotive has good curve negotiating performance, and the wheel / rail abrasion value is greatly reduced; only one set of diesel, generator and cooling device are used, the reliability and the economy of the locomotive are improved, and the production and use cost is reduced; and the application economical efficiency is high, the single-unit eight-axle locomotive can replace two four-axle locomotives, the number of the locomotive crew is reduced, and the use is convenient.

The invention discloses a compounded diesel oil composite fuel which can satisfy the requirement of the used fuel of compression ignition diesel oil automobiles, agricultural diesel engines and various boilers and ceramic baking furnaces igniting diesel oil, relieve the problem of energy shortage in time and in the long term, reduce the economic cost of the fuel, sufficiently ignite the fuel in an internal combustion engine and reduce discharge so as to be beneficial to environmental protection. The compounded diesel oil comprises the components of a coal coke byproduct, a fertilizer byproduct and a plurality of auxiliary materials. The compounded diesel oil can be singly used and can be also mixed with petrified diesel oil in any proportion so as to achieve each function of a diesel locomotive. The compounded diesel oil effectively overcomes the defects of small addition amounts, unstable performance, over high cost, part corrosion, and the like of other substitutive diesel oil and achieves the purposes of energy saving, environmental protection, high efficiency, money saving and convenience.

An electric automobile and diesel locomotive mixed traffic flow-based jammed traffic network equilibrium method disclosed by the present invention comprises the steps of firstly converting an actual mixed road network into the abstract nodes and road section networks, constructing a traffic distribution model considering a conventional internal combustion automobile and electric automobile mixed travel mode, and solving the model by a gradient projection algorithm to obtain a conventional internal combustion automobile and electric automobile mixed travel network equilibrium mode and the roadsection traffic flow, thereby accurately analyzing the influence of the electric automobiles on the road network and analyzing how to adjust the road section traffic flow.

The water adding synthetic diesel oil contains composite fuel in 40-60 wt% except diesel oil; and the composite fuel consists of water 10-30 wt%, benzene 10-30 wt%, methanol 10-20 wt%, turpentine 20-45 wt%, isopropanol 5-10 wt%, fatty acid 5-10 wt%, dispersant 8-15 wt%, catalyst 5-10 wt% and assistant 2-5 wt%. The synthetic diesel oil has simple preparation process, stable performance and no delamination in long term storage, may be mixed in any ratio with diesel oil, kerosene, solvent oil, etc. before use. The product has less change in color and transparency, and may be used widely in diesel car, diesel locomotive, ship engine, diesel oil engine for air conditioner, boiler, etc.