CN203257586U - Diesel engine low-pressure low-temperature starting auxiliary device - Google Patents

Abstract

The utility model discloses an auxiliary device for low-pressure and low-temperature starting of a diesel engine, which comprises a temperature-rising starting mechanism and an electric starting mechanism. The circulation pipeline and the electromagnetic valve and the water pump arranged on the heating circulation pipeline; the electric starting mechanism includes a starter and a starting power supply, and the starting power supply includes a battery module and a supercharger connected in parallel with the battery module Capacitors and DC/DC converters connected in parallel with both battery modules and supercapacitors. The utility model first uses a fuel heater to heat up the cooling water to a certain temperature. At this time, the body is preheated, the temperature of the lubricating oil rises, the fuel heater stops working and switches to the cooling cycle mode; then the supercapacitor parallel battery module supplies power to the starter. The starter drives the crankshaft to rotate and starts the diesel engine smoothly.

Description

Diesel engine low pressure and low temperature starting aid device

technical field

The utility model relates to the technical field of low-temperature starting, in particular to an auxiliary device for low-pressure low-temperature starting of a diesel engine.

Background technique

The low-temperature starting performance of a diesel engine is one of the important performance indicators of a diesel engine. It is not only related to the working efficiency of the whole machine, but also affects its emission indicators, fuel consumption and service life. Under plateau environmental conditions, due to the high altitude (low atmospheric pressure), low air oxygen content, large temperature difference between day and night, and long cold season in the plateau area, the intake temperature and pressure of the diesel engine will drop at the same time, resulting in the end of compression in the cylinder of the diesel engine. The temperature and pressure drop, resulting in the mixed gas and combustion conditions in the cylinder not meeting the ignition and continued combustion requirements of the diesel engine. In addition, as the ambient temperature decreases, the output power of the battery also decreases accordingly (at -30°C, the rated output power decreases by about 60%), resulting in a decrease in the power of the diesel engine starting system, making the diesel engine unable to start or Does not start reliably. In addition to optimizing the design of the diesel engine itself, the most important thing to improve the low-pressure and low-temperature starting performance of the diesel engine is to adopt low-temperature starting auxiliary measures.

At present, almost 100% of diesel vehicles in active service in my country's plateau and cold regions are equipped with cold start auxiliary measures. The auxiliary measures for cold start mainly include glow plugs, PTC ceramic intake preheating, flame intake preheating, battery insulation boxes, etc. However, the traditional auxiliary measures for cold start of diesel engines cannot adapt to the harsh climate and environmental conditions in plateau cold regions, especially in plateau (above 3000m) and severe cold (below -41°C) regions, the low-temperature starting devices and equipment equipped with vehicles are not suitable for plateau cold regions In a low temperature environment, it is difficult for the vehicle to start smoothly.

Contents of the invention

The purpose of the utility model is to provide a low-pressure and low-temperature start-up auxiliary device for a diesel engine combined with a fuel heater and a supercapacitor parallel-connected storage battery, aiming at the technical defects in the prior art.

The technical scheme adopted for realizing the purpose of this utility model is:

A low-pressure low-temperature start-up auxiliary device for a diesel engine, comprising a temperature-rising starting mechanism and an electric starting mechanism, the temperature-rising starting mechanism comprising a fuel heater, a temperature-rising circulation pipeline connecting the cooling circulation pipeline of the coolant with the fuel heater, and a device Solenoid valve and water pump on the described warming circulation pipeline; The described electric starting mechanism comprises starter and starting power supply, and described starting power supply comprises battery module and the supercapacitor connected in parallel with the battery module and simultaneously with the battery A DC/DC converter in which modules and supercapacitors are connected in parallel.

The cooling circulation pipeline includes a water return pipe, a water inlet pipe, a circulating water pump and a heat exchange unit, and the heating circulation pipeline includes a heating water inlet pipe and a heating return water pipe respectively provided with electromagnetic valves. The water pipe and the warming return pipe connect the fuel heater with the return pipe or the water inlet pipe respectively.

The supercapacitor is a plurality of supercapacitors connected in series in sequence.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model first uses a fuel heater to heat the cooling water to a certain temperature. At this time, the body is preheated, the temperature of the lubricating oil rises, the fuel heater stops working and switches to the cooling cycle mode; then the supercapacitor parallel battery module supplies power to the starter. The starter drives the crankshaft to rotate and starts the diesel engine smoothly. On the one hand, this device enhances the discharge capacity of the starting power supply to ensure the smooth start of the diesel engine; on the other hand, it reduces the starting resistance, reduces the wear of the diesel engine when starting at low temperature, and prolongs the service life of the diesel engine.

Description of drawings

Shown in Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, the diesel engine low-pressure low-temperature start-up auxiliary device of the present invention includes a warm-up starting mechanism and an electric starter mechanism, and the described warm-up starting mechanism includes a fuel heater 1, a cooling circulation pipeline for engine coolant and a fuel oil heater. The temperature-raising circulation pipeline communicated with the heater and the electromagnetic valve and the water pump 2 arranged on the temperature-raising circulation pipeline; the electric starting mechanism includes a starter 5 and a starting power supply, and the starting power supply includes a battery module 3 and a The supercapacitor 4 connected in parallel with the battery module and the DC/DC converter 6 connected in parallel with the battery module 3 and supercapacitor 4 at the same time.

Among them, the fuel oil heater is an existing technology, such as ALAE's YJ series, etc. The fuel oil heater is a heating device independent of the engine, and is a heater product that heats the coolant in the circulation system through the principle of combustion heat exchange.

Specifically, the cooling circulation pipeline is the same as the prior art, and it includes a return pipe, a water inlet pipe, a circulating water pump 11, a heat exchange unit, and a first valve that can control the conduction or cut-off of the cooling circulation pipeline. 10. The heat exchange part can exchange heat with the engine and the machine body, so as to cool the machine body and control the temperature of lubricating oil. The temperature-rising circulation pipeline includes a temperature-rising water inlet pipe 12 and a temperature-rising return water pipe 13 respectively provided with solenoid valves. The water inlet pipe is connected, and the first valve is arranged between the return pipe, the water inlet pipe and the connection end of the cooling circulation pipeline, so that the cooling cycle and the heating cycle of the cooling liquid can be switched through valve control.

When the diesel engine is started, firstly close the first valve 10 and control the conduction of the heating circulation pipeline, and under the action of the water pump 2, the coolant can be externally circulated and heated by the fuel heater. Reduce the wear and tear of the diesel engine during the cold start process. When the temperature rises to a predetermined temperature, the first valve can be controlled to conduct and the solenoid valve on the heating cycle pipeline can be closed to make the coolant circulate.

Further, in order to improve control intelligence, both the first valve and the solenoid valve are controllably connected to the control part of the fuel heater, and at the same time, a temperature sensor is installed on the coolant circulation pipeline, and the state of each valve is switched before starting the fuel heater. Entering the heating cycle, the fuel heater emits heat by burning diesel oil and heats the coolant through heat exchange. When the coolant is heated to the predetermined temperature, the fuel heater can be stopped and the solenoid valve can be switched to the cooling cycle mode, so that the control is more intelligent and avoids The heating of the coolant lasts longer, reducing the warm-up time and reducing energy consumption.

The electric starting device uses the starting power to drive the starter to start the diesel engine, wherein the supercapacitor of the starting power has good discharge capacity and working reliability under extreme temperature environment conditions, and is an ideal starting power for the diesel engine in plateau areas. Due to the relatively low energy density of supercapacitors and weak power storage capacity, it is not feasible to completely replace batteries with supercapacitors as the main starting power supply, so supercapacitors are used in parallel with battery modules as starting power supplies for diesel engines. Combining the fuel heater and the supercapacitor parallel battery module as a low-pressure and low-temperature starting device for the diesel engine solves the problem of difficult cold starting of the diesel engine under plateau environmental conditions.

Preferably, the working voltage of the single supercapacitor used in the utility model is 2.4V, and the capacity is 1200F. In order to improve the use effect, the utility model adopts a supercapacitor group formed by connecting 10 supercapacitors in series. At the same time, a DC/DC converter is used in parallel with the storage battery and the supercapacitor to maintain the balance and stability of the voltage of each supercapacitor. Ensure the smooth and stable start of the starter.

That is, the utility model first uses the fuel heater to heat the cooling water to a certain temperature. At this time, the body is preheated, the temperature of the lubricating oil rises, the fuel heater stops working and switches to the cooling cycle mode; then the supercapacitor is connected in parallel with the battery module to supply power To the starter, the starter drives the crankshaft to rotate and start the diesel engine smoothly. It can ensure the smooth start of the diesel engine at an altitude of 5500m and an environmental condition of -41°C. On the one hand, this device enhances the discharge capacity of the starting power supply to ensure the smooth start of the diesel engine; on the other hand, it reduces the starting resistance, reduces the wear of the diesel engine when starting at low temperature, and prolongs the service life of the diesel engine.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these Improvement and retouching should also be regarded as the protection scope of the present utility model.

Claims (3)

1. A diesel engine low-pressure low-temperature starting auxiliary device is characterized in that it comprises a warming starting mechanism and an electric starting mechanism. The heating circulation pipeline and the solenoid valve and water pump arranged on the heating circulation pipeline; the electric starting mechanism includes a starter and a starting power supply, and the starting power supply includes a battery module and a battery module connected in parallel with the battery module A supercapacitor and a DC/DC converter connected in parallel with the battery module and the supercapacitor. 2. The low-pressure and low-temperature start-up auxiliary device for diesel engines according to claim 1, wherein the cooling circulation pipeline includes a water return pipe, a water inlet pipe, a circulating water pump and a heat exchange unit, and the heating circulation pipeline includes The temperature-raising water inlet pipe and the temperature-raising water return pipe of the electromagnetic valve are respectively arranged on it, and the temperature-raising water inlet pipe and the temperature-raising water return pipe communicate the fuel heater with the water return pipe or the water inlet pipe respectively. 3. The diesel engine low-pressure and low-temperature starting auxiliary device according to claim 1 or 2, wherein the supercapacitor is a plurality of supercapacitors connected in series in sequence.

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