CN106121886A - Fuel injector fast temperature control system on a kind of cylinder cap - Google Patents

Abstract

The invention discloses a temperature control system for a fuel injector on a cylinder head, which includes a circulation cavity and a temperature sensor module. The circulation cavity surrounds the nozzle of the cylinder head, and the cylinder head cooling liquid flows through the circulation cavity. The temperature sensor module includes a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged on the outer surface of the nozzle, and the second temperature sensor is arranged before the cylinder head coolant flows into the circulation cavity on the pipeline. The cylinder head coolant is a high-temperature coolant or a low-temperature coolant. The high-temperature coolant is heated through the entire engine cooling circuit. The low-temperature coolant has been cooled. Coolant. Also included is a flow control valve configured to adjust the ratio of the high temperature coolant to the low temperature coolant.

Description

A rapid temperature control system for the fuel injector on the cylinder head

technical field

The invention relates to the field of gasoline engines, in particular to a temperature control system for a fuel injector on a cylinder head.

Background technique

The wide application of gasoline engine direct injection system enhances the transient response capability of gasoline engine and improves its fuel economy at the same time. However, the difficulty of starting direct injection gasoline engines under cold start conditions and the high emission of exhaust particulate matter have always been the focus of research in academic and industrial circles. Studies have shown that properly raising the fuel temperature to achieve fuel flash spray can significantly improve the fuel atomization and evaporation effects under low fuel injection pressure conditions, reduce gasoline engine exhaust emissions, and improve fuel economy. At present, all such technologies for heating fuel oil are basically realized through the solution of electric heating nozzle, that is, an electric heating module is designed inside the nozzle, and the fuel is heated through this heating module when the fuel flows through the nozzle. Although this solution can significantly improve the fuel atomization and evaporation effects, it increases the cost of nozzle design and manufacturing, and also requires an external battery for power supply, which is poor in environmental protection. In addition, the electric heating nozzle can only realize the heating function, but cannot realize the cooling function.

Therefore, those skilled in the art are committed to developing a temperature control system for the injector on the cylinder head, which can heat or cool the direct injection fuel without external power supply.

Contents of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide how to heat or cool the direct injection fuel without external power supply.

In order to achieve the above object, the present invention provides a temperature control system for the fuel injector on the cylinder head, which includes a circulation cavity and a temperature sensor module, the circulation cavity surrounds the nozzle of the cylinder head, and the coolant of the cylinder head flows through the In the circulating cavity, the temperature sensor module includes a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged on the outer surface of the nozzle, and the second temperature sensor is arranged at the place where the cylinder head coolant flows into the on the pipeline before the circulation chamber.

Further, the cylinder head coolant is a high-temperature coolant or a low-temperature coolant, and the high-temperature coolant is a coolant heated through the entire engine cooling circuit, and the low-temperature coolant is cooled after flowing through the engine. Coolant before the circuit.

Further, a flow control valve is also included, and the flow control valve is configured to adjust the ratio of the high-temperature cooling liquid and the low-temperature cooling liquid.

The temperature control system of the fuel injector on the cylinder head according to the present invention uses the cylinder head coolant to control the temperature of the nozzle. At the installation position of the nozzle of the cylinder head, a cooling liquid circulation cavity is designed, and the cavity surrounds the main part of the nozzle. When the coolant flows through the cavity, the nozzle body can be heated or cooled. A first temperature sensor is installed on the outer surface of the nozzle body to monitor the temperature of the nozzle body in real time. A second temperature sensor is also installed on the pipeline before the coolant flows into the circulating cavity around the nozzle to monitor the temperature of the coolant flowing into the cavity. There are two types of coolant flowing into the cavity, one is high-temperature coolant, which is heated through the entire engine cooling circuit; the other is low-temperature coolant, which has been cooled before flowing through the engine cooling circuit. of coolant. The ratio of the high-temperature coolant and the low-temperature coolant can be controlled by controlling the low-temperature coolant flowing into the chamber through a control valve. When the nozzle temperature is lower than the target temperature, the opening angle of the control valve becomes smaller or closed, increasing the proportion of high-temperature coolant flowing into the cavity to realize the fuel heating function. When the nozzle temperature is higher than the target temperature, the control valve is opened to increase the proportion of low-temperature coolant entering the cavity to realize the fuel cooling function.

The fuel injector temperature control system on the cylinder head of the present invention uses the engine cylinder head coolant to heat (cool) the nozzle without external energy supply, and uses the waste heat of the engine coolant to further improve the heat utilization efficiency of the engine; It can heat the fuel and cool down the fuel; no special nozzle structure is required, which reduces the cost of the fuel injection system; the design and installation are simple, and it is only necessary to introduce the cylinder head coolant into the cavity around the nozzle for circulation.

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Description of drawings

Fig. 1 is a schematic sectional structure diagram of a preferred embodiment of the present invention;

1-high temperature coolant inlet; 2-low temperature coolant inlet; 3-coolant inlet pipeline; 4-flow control valve; 5-second temperature sensor; 6-nozzle; 7-first temperature sensor; 8-coolant Outlet pipeline; 9-coolant outlet; 10-cavity.

detailed description

As shown in FIG. 1 , the temperature control system of the fuel injector on the cylinder head according to the present invention uses the cylinder head coolant to heat or cool the nozzle, so as to realize the function of fuel temperature control. The coolant flows into the cavity 10 through the inlet line 3 and then flows out through the outlet line 8 .

Two kinds of cooling liquid can flow into the inlet pipeline, the high-temperature cooling liquid flows in from the inlet 1, and the low-temperature cooling liquid flows in from the low-temperature cooling liquid inlet 2. The ratio of the high temperature and low temperature coolant flowing into the cavity 10 can be adjusted by controlling the flow control valve 4 . When the flow control valve 4 is fully closed, no low-temperature coolant flows into the circulation cavity; when the flow control valve is fully open, the approximate ratio of high-temperature and low-temperature coolant is 1:1.

The second temperature sensor 5 is installed on the pipeline before the cooling liquid enters the cavity 10, and monitors the temperature of the cooling liquid flowing into the cavity in real time. The coolant flows in the cavity 10 to heat the nozzle 6 and further realize the heating function of the fuel in the nozzle. The cooling liquid after the heating nozzle flows out through the cooling liquid pipeline 8, and flows into the cooling liquid cooling system through the cooling liquid outlet 9.

Since the nozzle of the direct injection gasoline engine is directly installed in the combustion chamber, the heat generated during the combustion process will directly heat the nozzle, so there are two aspects to the control of the nozzle temperature, one is heating and the other is cooling. Because the fuel temperature is different, the fuel spray is not the same, so the fuel temperature needs to be adjusted to achieve the best fuel spray.

Here the heating or cooling function is as follows:

(1) When the nozzle temperature detected by the second temperature sensor 7 is lower than the target temperature, adjust the opening of the flow control valve 4 to reduce the proportion of the low-temperature coolant flowing in, so as to realize rapid heating of the nozzle;

(2) When the temperature of the nozzle detected by the second temperature sensor 7 is higher than the target temperature, the opening of the flow control valve 4 is adjusted to increase the proportion of low-temperature coolant flowing in, so as to realize rapid cooling of the nozzle.

The opening of the flow control valve 4 is controlled by calculating the temperature of the nozzle detected by the temperature sensor 7 and the temperature of the coolant flowing into the cavity detected by the first temperature sensor 5 and the target nozzle temperature.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (3)

1. A temperature control system for an injector on a cylinder head, characterized in that it includes a circulation chamber and a temperature sensor module, the circulation chamber surrounds the nozzle of the cylinder head, and the cylinder head coolant flows through the circulation chamber body, the temperature sensor module includes a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged on the outer surface of the nozzle, and the second temperature sensor is arranged when the cylinder head coolant flows into the circulation chamber on the pipeline before the body. 2. The temperature control system of the fuel injector on the cylinder head according to claim 1, wherein the cylinder head coolant is a high-temperature coolant or a low-temperature coolant, and the high-temperature coolant flows through the entire engine cooling circuit The heated coolant, the low-temperature coolant has undergone cooling treatment, and the coolant before flowing through the engine cooling circuit. 3. The temperature control system of the fuel injector on the cylinder head according to claim 2, further comprising a flow control valve configured to adjust the ratio of the high-temperature coolant to the low-temperature coolant.