CN109139327B - Low-pressure oil way supply system of diesel power vehicle and control method thereof - Google Patents
Low-pressure oil way supply system of diesel power vehicle and control method thereof Download PDFInfo
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- CN109139327B CN109139327B CN201811146217.8A CN201811146217A CN109139327B CN 109139327 B CN109139327 B CN 109139327B CN 201811146217 A CN201811146217 A CN 201811146217A CN 109139327 B CN109139327 B CN 109139327B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
- F02M31/125—Fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
Abstract
The invention relates to a low-pressure oil way supply system of a diesel engine and a control method thereof, aiming at the practical problems of oil supply aspects such as starting and using difficulty and the like that the used oil product of a diesel power vehicle does not meet the local environmental temperature requirement under the low-temperature environment, the system solves the problems of low-temperature starting difficulty caused by the oil product of the diesel engine and using difficulty under the condition that the oil product does not meet the environmental temperature requirement, and realizes the functions of quickly heating the fuel oil after starting, heating under the conditions that the environmental temperature is too low and the oil product is not of sufficient grade in use and the like.
Description
Technical Field
The invention relates to a supply system of a diesel-powered vehicle and a control method thereof, in particular to a low-pressure oil way heating supply system of the diesel-powered vehicle and a control method thereof, belonging to the technical field of vehicle diesel engines.
Background
Aiming at the practical problems in the aspects of oil supply such as starting and difficult use and the like that the used oil product of a diesel power vehicle does not meet the local environment temperature requirement under the low-temperature environment, the current low-pressure oil way heating system devices are divided into two types:
one heating mode is a pure electric heating system, and a resistance wire is adopted in a low-voltage oil way for heating; the other is pure cooling liquid heating with double oil tanks, the pipeline, the filter and the oil tank are all heated by the cooling liquid, a high-grade oil heat engine is firstly used, and the low-grade oil is used for working after certain conditions are achieved; both of these heating methods, however, have several problems.
Problems with pure electric heating:
1. in the cold weather, the capacity of the battery is insufficient under the normal condition, the whole low-pressure oil way (oil pipe, filter and oil tank) is difficult to heat at the same time during starting, and even the electric quantity cannot drive the starter after heating under most conditions.
2. The resistance wire is not fixed in the pipeline, and is easy to overheat to generate potential safety hazard when bending deformation occurs in use.
The main problems of pure water cooling and heating of the double oil tanks are as follows:
1. the fuel pipeline needs to be provided with an inner layer and an outer layer, is difficult to process and has low batch feasibility, and cannot be realized, and most of oil pipes need to be molded.
2. The filter adopts an outer water jacket, and the feasibility of manufacture and assembly is low.
The heating of the whole system is realized by the following steps:
A. preheating stage before starting:
the storage battery heats the PTC fuel oil pipeline and the filter, and the oil quantity is small and the electric quantity is not large;
the oil tank adopts a fuel heater to directly burn oil in the oil tank to heat the cooling liquid, and then the cooling liquid heats the fuel oil in the oil tank.
B. The use stage after starting:
pipeline and filtering: under the condition of external supercooling, the engine is charged with a motor to charge the storage battery, the PTC oil pipe heats fuel oil flowing through the pipeline under the condition of requirement, and the fuel oil filter is still heated and insulated by the disc type and the outer wrapping type PTC heating sleeve.
An oil tank: after starting, a driver closes a fuel heater switch, simultaneously opens a bypass electromagnetic valve (the bypass electromagnetic valve and the fuel heater switch are in an integrated interlocking structure, and the bypass electromagnetic valve and the fuel heater switch are closed, the bypass electromagnetic valve and the fuel heater switch are opened, the bypass electromagnetic valve and the fuel heater switch are connected, an engine water pump conveys cooling liquid to heat fuel in a fuel tank, and a water-cut electromagnetic valve on a fuel tank heating module controls the heating pipeline to be switched on and off according to a temperature signal.
Disclosure of Invention
The invention aims to: the system solves the problems of difficult low-temperature starting of the diesel engine caused by oil products and use of the diesel engine when the oil products do not meet the requirement of the environmental temperature, and realizes the functions of quick temperature rise of fuel after starting, heating of the diesel engine when the fuel is used due to the over-low environmental temperature and insufficient oil products.
In order to achieve the aim, the invention provides a low-pressure oil way heating system of a diesel power vehicle, which comprises a fuel oil heating system and a coolant circulating heating system, wherein the fuel oil heating system consists of an engine (1), a fuel oil tank assembly (3) with a heating module, a PTC (positive temperature coefficient) electric heating fuel oil pipe, a fuel oil heater (4) and a fuel oil filter assembly (5), an oil outlet of the fuel oil tank assembly is connected to an oil inlet of the engine through a second PTC electric heating fuel oil pipe (23) after passing through the fuel oil filter assembly through a first PTC electric heating fuel oil pipe (22), an oil return port of the fuel oil tank assembly is connected with an oil return port of the engine through a third PTC electric heating fuel oil pipe (24), and the PTC external filtering heater is sleeved outside a metal cylinder of the fuel oil filter and is fixed by a clamp; the oil inlet of the fuel filter is connected with the oil outlet of the fuel tank through a first (22) PTC electric heating fuel pipe, and the oil outlet of the fuel filter is connected with the oil inlet of the engine through a second (23) PTC electric heating fuel pipe; an oil suction pipe (25) is connected between the oil suction port of the fuel oil heater and the oil tank;
the cooling liquid circulating heating system is composed of an engine (1), an oil tank assembly (3), a fuel heater (4), a cooling liquid conveying hose, a cooling liquid conveying tee joint and a bypass electromagnetic valve; the oil tank assembly is characterized in that a heating module is provided with a cooling liquid inlet and a cooling liquid outlet, the cooling liquid inlet is connected with a liquid outlet of the fuel oil heater through three cooling liquid inlet hoses, namely a third cooling liquid inlet hose (40), a second cooling liquid inlet hose (39), a first cooling liquid inlet hose (38), the cooling liquid outlet is connected with the fuel oil heater through two cooling liquid outlet hoses, namely a first cooling liquid outlet hose (42), a second cooling liquid outlet hose (43) through an engine, a first cooling liquid return hose (36) and a second cooling liquid return hose (37), the liquid outlet of the fuel oil heater is connected with a bypass cooling liquid inlet hose (45) through a first cooling liquid three-way joint (47), a bypass electromagnetic valve (13) is installed on the bypass cooling liquid conveying hose, and the bypass electromagnetic valve is connected with a system switch 10 in the cab through a wiring (12), the tail end of the bypass cooling liquid inlet hose (44) is connected with a first cooling liquid return hose (36) through a second cooling liquid three-way joint (46), and the other interface of the second cooling liquid three-way joint is connected with a second cooling liquid return hose (37) connected with a liquid inlet of the fuel heater.
The system solves the problems of difficult low-temperature starting of the diesel engine caused by oil products and use of the diesel engine when the oil products do not meet the requirement of the environmental temperature, and realizes the functions of quick temperature rise of fuel after starting, heating of the diesel engine when the fuel is used under the conditions of over-low environmental temperature and insufficient oil product grade, and the like.
Furthermore, the heating module of the oil tank assembly is fixed in an oil tank, the upper part of the heating module is provided with a water, oil pipeline interface and a liquid level temperature signal wire harness interface, the water, oil pipeline interface and the liquid level temperature signal wire harness interface are fixed on the upper part of a shell of the oil tank through a support top plate, the lower part of the heating module extends into the oil tank and comprises an oil tank sensor sliding block fixed on a support rod, the water and oil pipeline interface is respectively connected with an oil inlet pipe and a heat exchange water pipe which are distributed along two sides of the oil tank sensor, and the end of the oil inlet pipe orifice and the end of the heat exchange water pipe are fixed in an oil collecting area at the bottom of the.
The invention uses cooling liquid to provide heat source, and heat conduction is a heat transfer mode to heat; the cooling liquid heated by the fuel oil heater flows into the fuel oil heating module of the oil tank to exchange heat with the fuel oil in a wax precipitation state around the primary filter of the oil inlet through the mushroom head at the lower part, so that the oil in the fuel oil tank is heated. The heating module is provided with a water cut-off electromagnetic valve and a temperature sensor, and the water cut-off electromagnetic valve is controlled to be opened and closed by acquiring oil temperature data and sending a signal through an ECU according to a set temperature value, so that the temperature range for heating the oil tank is controlled.
Furthermore, the fuel filter comprises a manual oil pump with an integrated starting end part, a disc type fuel heater arranged between the filter base and the filter tank and a fuel temperature sensor arranged at an oil outlet of the filter; the disc heater is connected with the filter base and the filter tank is connected with the disc heater through threads and sealed through sealing rings; the external wrapping heater is sleeved outside a metal shell of the fuel filter and is fixed through a rigid belt test hoop or a binding belt.
Further, the disc heater heats fuel oil flowing in through the oil inlet and simultaneously heats surrounding oil; and the ECU controls the opening and closing of the disc heater according to data acquired by the temperature sensor.
Further, the external-wrapping heater conducts heat conduction from the periphery to heat the fuel oil and then conveys the fuel oil to the oil outlet; the external-wrapping heater carries out self-regulation of heating power and on-off control through the self performance of the PTC.
Further, PTC electrical heating fires the oil pipe and includes heating oil pipe body, the both ends symmetry of heating oil pipe body is fixed with transition joint, transition joint is connected with rubber hose through the clamp, and one end rubber hose's tip is equipped with the quick connector who conveniently carries out rapid Assembly with the oil circuit part, and the one end that deviates from mutually with quick connector outwards extends through the transition joint that the integration has temperature detect switch and has integrated pencil from this for intraductal fluid heating power supply. Heating oil pipe body is by outer to interior insulating layer, heat preservation and the zone of heating of including in proper order, the insulating layer is the corrugated thermal-insulated sheath that has the surface, is fixed with fire-retardant heat preservation through gluing in it, be equipped with modified PA11 zone of heating in the fire-retardant heat preservation, the equipartition has adhesive polyolefin and modified PA12 zone of heating on the modified PA11 zone of heating.
Further, the PTC electric heating fuel pipe is powered by a vehicle to provide heating energy, fuel in the fuel pipe is heated before and after starting, and temperature control is carried out by utilizing the characteristic that the resistance of the PTC material changes along with the change of temperature;
under the condition of power-on, when the temperature of fuel is lower than 5 +/-3 ℃, the PTC oil pipe starts to heat and the lower the temperature is, the higher the power is, and the heat balance point is reached; when the temperature rises to 15 +/-3 ℃, the resistance sharply increases to gradually reach an approximate cut-off state, the approximate cut-off state is that the resistance increasing value rises when the temperature rises, the voltage is unchanged, the current is reduced, and the heating power P = UI is reduced, so that the PTC electric heating fuel pipe starts to work when the fuel temperature is lower than 5 ℃, and the resistance is reduced when the temperature is lower, and the PTC heating tends to stably work when the resistance is reduced to a point close to the switching temperature, namely the Curie temperature, or approaches to the thermal balance with the outside in advance.
A control method of a low-pressure oil way heating system of a diesel-powered vehicle comprises the following steps,
and 3, after the engine is started, the external conditions reach the normal use requirement of the engine, the switch of the fuel heater is closed, the switch of the bypass electromagnetic valve is opened, the engine fully works at the moment, the temperature of the small-cycle coolant of the engine reaches the work requirement, the water pump of the engine conveys part of the heated coolant to flow through the bypass electromagnetic valve and enter the fuel heating module in the oil tank, so that the function of heating the oil tank in the whole process is achieved, and the heating temperature is controlled by the electromagnetic valve of the fuel tank heating module.
The invention has the beneficial effects that:
compared with pure electric heating: the invention has less electricity consumption in the preheating starting stage and is easier to start; compared with a mode of internally arranging a resistance wire oil pipe, the PTC oil pipe is safe and reliable by using a urea heating pipe.
Compared with pure water heating, the invention does not need to adopt double oil tanks and two brands of fuel oil, the PTC oil pipe is in a mode of borrowing a urea heating pipe, and compared with two layers of heating oil pipes with water jackets, the invention is easy to form and mass production.
The invention has simple structure, reasonable layout, convenient use, easy manufacture and low use cost, is suitable for batch production and can meet the market demand of commercial vehicles in special areas.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the structural principle of the present invention
Fig. 3 is a schematic view of the temperature-resistance characteristics of the PTC material.
Description of reference numerals: 1 engine assembly, 2 cab, 3 fuel tank assembly, 4 fuel liquid heater assembly, 5 diesel filter assembly, 6 PTC external heating jacket, 7 storage battery assembly, 8 engine oil pump, 9 engine water pump, 10 fuel liquid heater assembly 4 and by-pass solenoid valve 13 switch, 11 cab vehicle key switch, 12 by-pass solenoid valve control coil, 13 by-pass solenoid valve body, 14 fuel float with integrated heating module, 15 oil float temperature sensor, 16 water heating spiral pipe, 17 temperature control solenoid switch, 18 water break solenoid valve control coil, 19 water break solenoid valve body, 20 fuel heater water pump, 21 fuel heater oil pump, 22 first PTC heating fuel pipe assembly, 23 second PTC heating fuel pipe assembly, 24 third PTC heating fuel pipe assembly, 25 fuel heater oil suction pipe, 26 temperature control switch on first PTC heating fuel pipe, 27 PTC external heating jacket upper temperature control switch, 28 second PTC heating fuel pipe upper temperature control switch, 29 third PTC heating fuel pipe upper temperature control switch, 30 first PTC heating fuel pipe upper temperature control switch use temperature sensor, 31 PTC external heating jacket upper temperature control switch use temperature sensor, 32 second PTC heating fuel pipe upper temperature control switch use temperature sensor, 33 third PTC heating fuel pipe upper temperature control switch use temperature sensor, 34 warm air inlet pipe, 35 warm air outlet pipe, 36 first cooling liquid return hose, 37 second cooling liquid return hose, 38 first cooling liquid inlet hose, 39 second cooling liquid return hose, 40 third cooling liquid return hose, 42 first cooling liquid outlet hose, 43 second cooling liquid outlet hose, 44 first bypass cooling liquid inlet hose, 45 second cooling liquid inlet hose, 46 second cooling liquid three-way joint, 47 a first coolant tee, 48 a third coolant tee, and 49 a fourth coolant tee.
Detailed Description
The invention provides a low-pressure oil way supply system of a diesel power vehicle, which aims at the practical problems of starting and using difficulties and the like that the used oil product of the diesel power vehicle does not meet the local environmental temperature requirement under the low-temperature environment, solves the problems of low-temperature starting difficulty caused by the oil product of a diesel engine and using problems when the oil product does not meet the environmental temperature requirement, and realizes the functions of quickly heating the fuel oil after starting, heating the fuel oil under the conditions of over-low environmental temperature and insufficient oil product grade in use and the like. Wherein, the low-pressure oil circuit that needs heating mainly is: the PTC electric heating fuel oil pipe, the oil tank assembly with the heating module and the belt disc type heating and outer wrapping type PTC heat fuel oil filter assembly. The system heating auxiliary member is: the system comprises a fuel heater, a fuel supply pipe of the fuel heater, a cooling liquid conveying hose, a bypass electromagnetic valve and a cooling liquid conveying tee joint.
The system is shown in figure 2 and comprises a fuel oil heating system and a coolant circulating heating system, wherein the fuel oil heating system comprises an engine 1, a fuel tank assembly 3 with a heating module, a PTC (positive temperature coefficient) electric heating fuel oil pipe, a fuel oil heater 4 and a fuel oil filter assembly 5, an oil outlet of the fuel tank assembly is connected to an oil inlet of the engine through a second PTC electric heating fuel oil pipe 23 after passing through the fuel oil filter assembly through a first PTC electric heating fuel oil pipe 22, an oil return port of the fuel tank assembly is connected with an oil return port of the engine through a third PTC electric heating fuel oil pipe 24, and a PTC external filtering heater is sleeved outside a fuel oil filter metal cylinder and fixed by a hoop; the oil inlet of the fuel filter is connected with the oil outlet of the oil tank through a first PTC electric heating fuel pipe, and the oil outlet of the fuel filter is connected with the oil inlet of the engine through a second PTC electric heating fuel pipe; an oil suction pipe 25 is connected between the oil suction port of the fuel oil heater and the oil tank.
The cooling liquid circulating heating system consists of an engine, an oil tank assembly, a fuel oil heater, a cooling liquid conveying hose, a cooling liquid conveying tee joint and a bypass electromagnetic valve; a cooling liquid inlet and a cooling liquid outlet are arranged on a heating module of the oil tank assembly, the cooling liquid inlet is connected with a liquid outlet of the fuel oil heater through four cooling liquid inlet hoses 41, 40, 39 and 38, the coolant outlet is returned to the fuel heater through two coolant outlet hoses 42 and 43 via the engine, the first coolant return hose 36 and the second coolant return hose 37, the liquid outlet of the fuel heater is connected with a bypass coolant inlet hose 45 through a first coolant three-way joint 47, a bypass electromagnetic valve 13 is arranged on the bypass cooling liquid conveying hose and is connected with the fuel heater through a wiring 12, the end of the bypass coolant inlet hose 44 is connected to the first coolant return hose 36 via a second coolant tee fitting 46, the other port of the second cooling liquid three-way joint is connected with a second cooling liquid return hose 37 connected with a liquid inlet of the fuel heater.
The structure of the low-pressure fuel supply system of the diesel engine provided by the embodiment is shown in fig. 1, the fuel filter comprises a manual oil pump with an integrated starting end part, a disc type fuel heater arranged between a filter base and a filter tank and a fuel temperature sensor arranged at an oil outlet of the filter, and the disc type fuel heater is connected with the filter base and the filter tank and the disc type fuel heater through threads and sealed through sealing rings. The external-wrapping heater is sleeved outside a metal shell of the fuel filter and is fixed through a rigid belt test hoop or a binding belt.
The disc heater heats fuel oil flowing in through the oil inlet, and the heated fuel oil passes through the filter paper and simultaneously heats surrounding oil. The external-wrapping heater conducts heat conduction from the periphery to heat the fuel oil and then conveys the fuel oil to the oil outlet. The disc heater collects data through the temperature sensor and then the ECU controls the disc heater to be turned on and turned off, and the outer wrapping heater performs self-regulation of heating power and turning on and off control through the self performance of the PTC.
The fuel oil heater is electrically driven, diesel oil in a wax precipitation state in the oil tank is sucked into the heater through an electric pump of the heater to be ignited and heat the cooling liquid, and the heated cooling liquid is conveyed to a tank fuel oil heating module of the fuel oil tank 3 through a water pump of the heater to heat the fuel oil in the oil tank.
PTC electrical heating fires oil pipe includes heating oil pipe body, and its both ends symmetry is fixed with and is connected transition joint through clamp and rubber hose, and rubber hose's tip is equipped with the quick connector that conveniently carries out rapid Assembly with the oil circuit part, and the one end that deviates from mutually with quick connector outwards extends through the transition joint that the integration has temperature detect switch and has integrated pencil from this for intraductal fluid heating power supply. Simultaneously, the heating oil pipe body is by outer to interior insulating layer, heat preservation and zone of heating that include in proper order, and this insulating layer is the insulating sheath that has the ripple on the surface, is fixed with fire-retardant heat preservation through the gluing in it, and is equipped with modified PA11 zone of heating in the fire-retardant heat preservation, and the equipartition has adhesive polyolefin and modified PA12 zone of heating on the modified PA11 zone of heating.
The PTC electric heating fuel pipe is powered by a vehicle to provide heating energy, heats fuel in the fuel pipe before and after starting, and controls the temperature by utilizing the characteristic that the resistance of the PTC material changes along with the change of the temperature; under the condition of power-on, when the temperature of fuel is lower than 5 +/-3 ℃, the PTC oil pipe starts to heat and the lower the temperature is, the higher the power is, and the heat balance point is reached; when the temperature rises to 15 +/-3 ℃, the resistance sharply increases to gradually reach an approximate cut-off state, the approximate cut-off state is that the resistance increasing value rises when the temperature rises, the voltage is unchanged, the current is reduced, and the heating power P = UI is reduced, so that the PTC electric heating fuel pipe starts to work when the fuel temperature is lower than 5 ℃, and the resistance is reduced when the temperature is lower, and the PTC heating tends to stably work when the resistance is reduced to a point close to the switching temperature, namely the Curie temperature, or approaches to the thermal balance with the outside in advance.
The fuel tank assembly with the heating module is provided with a heat source by cooling liquid, and the heat conduction is used for heating in a heat transfer mode; the cooling liquid heated by the fuel oil heater flows into the fuel oil heating module of the oil tank to exchange heat with the fuel oil in a wax precipitation state around the primary filter of the oil inlet through the mushroom head at the lower part, so that the oil in the fuel oil tank is heated. The heating module is provided with a water cut-off electromagnetic valve and a temperature sensor, and the water cut-off electromagnetic valve is controlled to be opened and closed by acquiring oil temperature data and sending a signal through an ECU according to a set temperature value, so that the temperature range for heating the oil tank is controlled.
A control method for a low-pressure oil circuit heating system of a diesel-powered vehicle is characterized in that an oil inlet pipe, an oil return pipe and a fuel filter assembly are heated electrically, and a fuel tank assembly is heated by cooling liquid.
Comprises the following steps of (a) carrying out,
and 3, after the engine is started, the external conditions reach the normal use requirement of the engine, the switch of the fuel heater is closed, the switch of the bypass electromagnetic valve is opened, the engine fully works at the moment, the temperature of the small-cycle coolant of the engine reaches the work requirement, the water pump of the engine conveys part of the heated coolant to flow through the bypass electromagnetic valve and enter the fuel heating module in the oil tank, so that the function of heating the oil tank in the whole process is achieved, and the heating temperature is controlled by the electromagnetic valve of the fuel tank heating module.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A low pressure oil way supply system for a diesel powered vehicle, characterized by: the oil-saving heating device comprises a fuel oil heating system and a coolant circulating heating system, wherein the fuel oil heating system comprises an engine (1), an oil tank assembly (3) with a heating module, a PTC (positive temperature coefficient) electric heating fuel oil pipe, a fuel oil heater (4), a fuel oil filter assembly (5), a control switch (10) in a cab and a power supply circuit, an oil outlet of the oil tank assembly is connected to an oil inlet of the engine through a second PTC electric heating fuel oil pipe (23) after passing through the fuel oil filter assembly through a first PTC electric heating fuel oil pipe (22), an oil return port of the oil tank assembly is connected with an oil return port of the engine through a third PTC electric heating fuel oil pipe (24), and a PTC external filtering heater is sleeved outside a metal cylinder of the fuel oil filter and fixed by a; an oil inlet of the fuel filter is connected with an oil outlet of the fuel tank through a first PTC electric heating fuel pipe (22), and an oil outlet of the fuel filter is connected with an oil inlet of an engine through a second PTC electric heating fuel pipe (23); an oil suction pipe (25) is connected between the oil suction port of the fuel oil heater and the oil tank; the control switch (10) in the cab has the function of selectively switching on and off the fuel heater (4) and the bypass electromagnetic valve (13);
the cooling liquid circulating heating system is composed of an engine (1), an oil tank assembly (3), a fuel heater (4), a cooling liquid conveying hose, a cooling liquid conveying tee joint and a bypass electromagnetic valve; the oil tank assembly is characterized in that a heating module is provided with a cooling liquid inlet and a cooling liquid outlet, the cooling liquid inlet is connected with a liquid outlet of the fuel heater through three cooling liquid inlet hoses, namely a third cooling liquid inlet hose (40), a second cooling liquid inlet hose (39), a first cooling liquid inlet hose (38), the cooling liquid outlet is connected with the fuel heater through two cooling liquid outlet hoses, namely a first cooling liquid outlet hose (42), a second cooling liquid outlet hose (43) and an engine, a first cooling liquid return hose (36) and a second cooling liquid return hose (37), the liquid outlet of the fuel heater is connected with a second bypass cooling liquid inlet hose (45) through a first cooling liquid three-way joint (47), a bypass electromagnetic valve (13) is installed on the bypass cooling liquid conveying hose, and the bypass electromagnetic valve is connected with a cab system control switch (10) through a wiring (12), the tail end of the first bypass cooling liquid inlet hose (44) is connected with a first cooling liquid return hose (36) through a second cooling liquid three-way joint (46), and the other interface of the second cooling liquid three-way joint is connected with a second cooling liquid return hose (37) connected with a liquid inlet of the fuel heater;
the cooling liquid circulating heating system supplies heat to the cab (2) at the same time and comprises a third cooling liquid three-way joint (48), a fourth cooling liquid three-way joint (49), a warm air inlet pipe (34) and a warm air outlet pipe (35); the cooling liquid heated by the fuel heater (4) enters a fan heater in the cab through a third cooling liquid three-way joint (48) and a warm air inlet pipe (34) to exchange heat with air in the cab, and meanwhile, the cooling liquid is cooled and flows through a warm air outlet pipe (35) and a fourth cooling liquid three-way joint (49) and then flows back to the engine through a second cooling liquid outlet hose (43);
the PTC electric heating fuel pipe comprises a heating oil pipe body, transition joints are symmetrically fixed at two ends of the heating oil pipe body and are connected with a rubber hose through a hoop, a quick-plugging joint convenient for quick assembly with an oil way component is arranged at the end part of the rubber hose at one end, one end of the transition joint, which is far away from the quick-plugging joint, is provided with an integrated wiring harness through the transition joint integrated with a temperature control switch, and the transition joint extends outwards and is provided with the integrated wiring harness so as to heat and supply power to oil liquid in the pipe; the heating oil pipe body sequentially comprises a heat insulation layer, a heat insulation layer and a heating layer from outside to inside, the heat insulation layer is a heat insulation sheath with corrugated surfaces, the flame-retardant heat insulation layer is fixed in the heat insulation layer through gluing, a modified PA11 heating layer is arranged in the flame-retardant heat insulation layer, and adhesive polyolefin and a modified PA12 heating layer are uniformly distributed on the modified PA11 heating layer;
the PTC electric heating fuel pipe is powered by a vehicle to provide heating energy, heats fuel in the fuel pipe before and after starting, and controls the temperature by utilizing the characteristic that the resistance of the PTC material changes along with the change of the temperature;
under the power-on condition, when the fuel temperature is lower than 8 ℃, the PTC oil pipe starts to heat and the lower the temperature is, the higher the power is, and the heat balance point is reached; when the temperature rises to 18 ℃, the resistance sharply increases to gradually reach an approximate cut-off state, wherein the approximate cut-off state is that the resistance increasing value rises when the temperature rises, the voltage is constant, the current is reduced, and the heating power P = UI is reduced, so that the PTC electric heating fuel pipe starts to work when the fuel temperature is lower than 8 ℃, and the resistance is reduced when the temperature is lower, and the PTC heating tends to stably work when the resistance is reduced to the close-switch temperature or approaches to the thermal balance with the outside in advance.
2. The low pressure oil line feed system for a diesel-powered vehicle as set forth in claim 1, wherein: the heating module of the oil tank assembly is fixed in an oil tank, the upper portion of the oil tank assembly is provided with a water pipe line interface, an oil level temperature signal wire harness interface and a shell upper portion of the oil tank, the water pipe line interface, the oil level temperature signal wire harness interface and the shell upper portion of the oil tank are fixed on a support top plate, the lower portion of the heating module extends into the oil tank and comprises an oil tank sensor sliding block fixed on a support rod, the water pipe line interface and the oil pipe line interface are respectively connected with an oil inlet pipe and a heat exchange water pipe which are distributed along two sides of the oil tank sensor, and the tail ends of the oil inlet pipe orifice and the heat exchange water pipe are fixed in.
3. The low pressure oil line feed system for a diesel-powered vehicle as set forth in claim 1, wherein: the fuel filter comprises a manual oil pump with an integrated starting end part, a disc type fuel heater arranged between a filter base and a filter tank and a fuel temperature sensor arranged at an oil outlet of the filter; the disc heater is connected with the filter base and the filter tank is connected with the disc heater through threads and sealed through sealing rings; the external-wrapping heater is sleeved outside a metal shell of the fuel filter and is fixed through a steel belt type hoop or a binding belt.
4. The low pressure oil line feed system for a diesel-powered vehicle of claim 3, characterized in that: the disc heater heats fuel oil flowing in through the oil inlet and simultaneously heats surrounding oil; and the ECU controls the opening and closing of the disc heater according to data acquired by the fuel temperature sensor.
5. The low pressure oil line feed system for a diesel-powered vehicle of claim 3, characterized in that: the external-wrapping heater conducts heat conduction from the periphery to heat the fuel oil and then conveys the fuel oil to the oil outlet; the external-wrapping heater carries out self-regulation of heating power and opening and closing control through the self performance of the PTC.
6. A control method of a low pressure oil line feed system for a diesel-powered vehicle according to any one of claims 1 to 5, characterized in that: comprises the following steps of (a) carrying out,
step 1, turning ON a switch of a fuel heater under the condition that a vehicle key is turned to an ON gear, wherein the fuel heater and a bypass electromagnetic valve are in an interlocking mode, the bypass electromagnetic valve is closed, the fuel heater starts to suck fuel in a wax precipitation state in a fuel tank and burns the fuel to heat coolant, meanwhile, the heater is provided with a water pump to convey the heated coolant to a mushroom head of a fuel tank heating module to heat the fuel near an oil suction port of the fuel tank, and meanwhile, the part of the coolant after heat exchange flows through an engine and then flows back to the heater to be reheated and circulated until the electromagnetic valve of the fuel tank heating module is closed or the vehicle key is closed;
step 2, heating the fuel oil in respective parts by using a PTC electric heating fuel oil pipe, a belt disc type heating and an outer wrapping type PTC hot fuel oil filtering simultaneously while heating the fuel oil in the fuel oil pipe, the belt disc type heating and the outer wrapping type PTC hot fuel oil filtering, and heating for 8-10 minutes to meet the time required by cooling and starting, wherein the fuel oil in the whole low-pressure oil way meets the normal use requirement;
and 3, after the engine is started, the external conditions reach the normal use requirement of the engine, the switch of the fuel heater is closed, the switch of the bypass electromagnetic valve is opened, the engine fully works at the moment, the temperature of the small-circulation coolant of the engine reaches the work requirement, the engine water pump conveys part of the heated coolant to flow through the bypass electromagnetic valve and enter the fuel heating module in the oil tank, so that the function of heating the oil tank in the whole process is achieved, and the heating temperature is controlled by the electromagnetic valve of the fuel tank heating module.
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| CN102072062B (en) * | 2011-01-18 | 2012-08-08 | 中国重汽集团济南动力有限公司 | Low-temperature preheating device used for motor vehicle |
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