CN204440208U - A kind of coolant temperature for engine rig test and volume control device - Google Patents

Abstract

Engine rig test coolant temperature of the present utility model and volume control device, mainly comprise heat exchanger, expansion tank, cooling water circulation water pump, the first threeway ratio converging valve, electric heater, bypass branch, the second threeway ratio converging valve, flow sensor, temperature sensor and system controller; Wherein, system controller comprises airflow calculator, flow controller and temperature controller.On the basis of the cooling-liquid temperature adjuster of engine of conventional, add the controlling functions of coolant rate, make the liquid coolant condition of engine rig test closer to actual conditions car load using radiator of water tank, improve accuracy and the authenticity of engine rig test result.

Description

A coolant temperature and flow control device for engine bench test

technical field

The utility model belongs to the technical field of automobile engine test equipment, in particular to a cooling liquid temperature and flow control device for engine bench tests.

Background technique

Generally speaking, during the engine bench test, it is difficult to directly use the radiator of the automobile radiator to control the temperature of the engine coolant, because the radiator of the radiator of the automobile is air-cooled in the car, and the simulation in the limited space of the engine test room The devices of vehicle speed and wind speed are both unrealistic, uneconomical, and difficult to control. At present, the engine coolant temperature control device with a water-cooled heat exchanger (instead of the radiator of the automobile radiator) is widely used. Performance parameters such as speed, torque, fuel consumption and emissions, and evaluation of durability and reliability.

Although this general engine coolant temperature control device keeps the coolant inlet temperature or outlet temperature constant, it is not consistent with the specific water tank radiator used by the engine on the vehicle. In automobiles, the flow of the engine water pump increases with the increase of the engine speed, but the functional relationship of the flow change is related to the specific water resistance of a specific water tank radiator. Due to the different water resistance characteristics between the universal engine coolant temperature control device used in the laboratory and the water tank radiator, the flow rate of the engine coolant varies with the engine speed. If the engine operates at a certain speed and load, the heat dissipation power of the coolant is constant, and the specific heat capacity of the coolant at constant pressure is also a constant, as can be seen from the following formula:

Heat dissipation power of engine coolant = constant pressure specific heat capacity of coolant x mass flow rate of engine coolant x (engine outlet water temperature - engine inlet water temperature)

Even if the engine inlet water temperature is kept constant, as long as the engine coolant flow rate is different, the engine outlet water temperature is also different, and vice versa. That is to say, even if the engine coolant temperature control device keeps the inlet water temperature (or outlet water temperature) constant, the outlet water temperature (or inlet water temperature) will be different due to the difference between the coolant flow rate and the radiator of the water tank. The heat load condition of the engine in this condition is different from that when the water tank radiator is installed on the car. This difference in heat load also causes the deviation of the measured performance parameters such as engine speed, torque, fuel consumption and emission, as well as the indicators for evaluating durability and reliability.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a control device for controlling the temperature and flow of engine coolant in real time according to the input coolant inlet/outlet temperature setting value.

A coolant temperature and flow control device for engine bench tests, mainly including a heat exchanger 3, an expansion tank 9, a cooling water circulation pump 10, a first three-way proportional confluence valve 11, an electric heater 13, a bypass branch Road 14, a second three-way proportional confluence valve 16, a flow sensor 17, a temperature sensor 18 and a system controller 19; wherein, the system controller includes a flow calculator, a flow controller and a temperature controller. The first three-way proportional confluence valve 11 is located between the engine water outlet and the cooling water circulation pump inlet, and is used for adjusting the engine coolant flow. The second proportional confluence valve 16 is located on the bypass branch 14 between the inlet and outlet of the engine 20, and can adjust the ratio of the cold water of the heat exchanger and the hot water of the electric heater according to the temperature control requirements.

Wherein, the flow sensor 17 may be located at the water inlet or the water outlet of the engine 20 ; the temperature sensor 18 may be located at the water inlet or the water outlet of the engine 20 .

The principle of engine coolant temperature control: the temperature controller unit in the system controller 19 collects the temperature feedback value of the engine coolant flowing through the temperature sensor 18 according to the target input value J of temperature control, and adjusts the first three-way proportional regulating valve 11 , so that the ratio of the cold water in the heat exchanger 3 and the hot water in the electric heater 13 reaches the requirement of the temperature control target value.

The principle of engine coolant flow control: the flow controller unit in the system controller 19 collects the flow feedback value of the engine coolant flow sensor 17 according to the target input value I of flow control, controls the second three-way proportional regulating valve 16, and regulates The flow ratio of the cooling water circulation pump 10 and the bypass branch 14 is such that the flow of the coolant returning to the engine through the bypass branch 14 meets the requirement of the flow control target value.

There are several ways to input the set temperature and flow of engine coolant as follows:

Temperature setting: 1. Input the temperature setting value through the keyboard of the system controller;

2. Input the temperature setting value through the electrical signal of the external analog quantity.

Flow setting: 1. Directly input the flow setting value through the keyboard of the system controller;

2. Directly input the flow setting value through the electrical signal of the external analog quantity;

3. Input the engine speed value through the keyboard of the system controller, and convert the flow rate through the internal flow calculator.

The coolant condition control system for the engine bench test of the utility model adds an engine coolant flow calculator, a coolant flow sensor, and a coolant flow controller on the basis of a conventional engine coolant temperature control device. At the same time, the control function of the engine coolant flow through the three-way proportional confluence valve is added, so that the engine bench test can well simulate different engine heat load conditions when the water tank radiator is used on the whole vehicle, and avoid After controlling the inlet/outlet water temperature of the engine, the phenomenon that the temperature difference between the inlet and outlet water cannot match the test results of the whole vehicle improves the accuracy and authenticity of the engine bench test results.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the coolant temperature and flow control device used in the engine bench test of the present invention.

In the figure: A, interface B for supplying coolant to the engine, interface C for returning coolant from the engine, cooling water inlet D, cooling water outlet E, coolant filling and discharge port F, expansion tank manual air release port G, Automatic air release port H of the expansion tank, interface I of the air release pipe at the highest point of the engine and the expansion tank, engine speed signal interface J, setting input of the engine coolant temperature target value

1. Cooling water inlet ball valve 2. Cooling water filter 3. Heat exchanger 4. Automatic air release valve 5. Cooling water outlet ball valve 6. Expansion water tank level gauge 7. Expansion water tank automatic air release valve 8. Ball valve 9. Expansion Water tank 10, coolant circulation pump 11, first three-way proportional confluence valve 12, coolant filter 13, coolant heater 14, bypass branch 15, ball valve 16, second three-way proportional confluence valve 17, flow sensor 18, temperature sensor 19, system controller 20, engine

specific implementation plan

Below in conjunction with accompanying drawing, the specific embodiment of the utility model is further described.

As shown in Figure 1, the coolant temperature and flow control device for the engine bench test of the utility model mainly includes a heat exchanger 3, an expansion tank 9, a cooling water circulation pump 10, a first three-way proportional confluence valve 11, Electric heater 13, bypass branch 14, second three-way proportional confluence valve 16, flow sensor 17, temperature sensor 18 and system controller 19; wherein, system controller includes flow calculator, flow controller and temperature controller . The first three-way proportional confluence valve 11 is located between the engine water outlet and the cooling water circulation pump inlet, and is used for adjusting the engine coolant flow. The second proportional confluence valve 16 is located on the bypass branch 14 between the inlet and outlet of the engine 20, and can adjust the ratio of the cold water of the heat exchanger and the hot water of the electric heater according to the temperature control requirements. The flow sensor 17 is located at the water inlet of the engine 20 ; the temperature sensor 18 is located at the water inlet of the engine 20 .

Engine coolant temperature control: the temperature controller unit in the system controller 19 collects the temperature feedback value of the engine coolant flowing through the temperature sensor 18 according to the target input value J of temperature control, and adjusts the first three-way proportional regulating valve 11 so that The ratio of the cold water of the heat exchanger 3 and the hot water of the electric heater 13 meets the requirement of the temperature control target value.

Engine coolant flow control: the flow controller unit in the system controller 19 collects the flow feedback value of the engine coolant flow sensor 17 according to the target input value I of the flow control, controls the second three-way proportional regulating valve 16, and regulates the cooling water circulation The flow ratio of the water pump 10 and the bypass branch 14 is such that the flow of coolant returning to the engine through the bypass branch 14 meets the requirement of the flow control target value.

Claims (3)

1. A coolant temperature and flow control device for engine bench tests, mainly comprising a heat exchanger (3), an expansion tank (9), a cooling water circulation pump (10), a first three-way proportional confluence valve (11 ), electric heater (13), bypass branch (14), second three-way proportional confluence valve (16), flow sensor (17), temperature (18) and system controller (19); among them, the system control The controller includes a flow calculator, a flow controller and a temperature controller. The first three-way proportional confluence valve (11) is located between the engine water outlet and the inlet of the cooling water circulation pump, and the second proportional confluence valve (16) is located at the inlet of the engine (20). , on the bypass branch (14) between the outlets. 2. A kind of coolant temperature and flow control device for engine bench test as claimed in claim 1, is characterized in that: flow sensor (17) can be positioned at the water inlet place of engine (20) or engine water outlet place . 3. A kind of coolant temperature and flow control device for engine bench test as claimed in claim 1, temperature sensor (18) can be positioned at the water inlet place of engine (20) or engine water outlet place.