KR101154207B1 - Heat system control method for hybrid vehicle - Google Patents

Abstract

The present invention relates to a method for controlling a heating system for a hybrid vehicle, and continuously supplies an engine coolant to a heater core even when the engine is stopped by using an electric water pump unit for cooling water circulation adopted in a conventional hybrid vehicle without additional hardware. To maintain heating performance.

The present invention includes a hybrid-system control unit (HCU), a full automated temperature controller (FATC) and an engine control unit (ECU), and a hybrid electric vehicle (HEV) including an electric water pump for cooling water circulation. A system comprising: a first step of collecting indoor / outdoor temperature information in the FATC, collecting operation information of an engine in the ECU, and checking whether a heating request is input from a user; A second step of determining whether to start a heating engine from the information collected in the first step; And a third step of performing heating water pump driving control when it is determined that engine start is necessary in the second step.

Hybrid vehicles, heating, water pump

Description

Hybrid vehicle heating system control method {HEAT SYSTEM CONTROL METHOD FOR HYBRID VEHICLE}

1 is a flow chart illustrating a method for controlling a heating system for a hybrid vehicle of the present invention.

2 is a block diagram according to a method for controlling a heating system for a hybrid vehicle according to the present invention.

3 is a perspective view of a cooling / heating system of a conventional vehicle

  <Description of Symbols for Main Parts of Drawings>

110: HCU (Hybrid-System Control Unit)

120: Full Automated Temperature Controller

130: ECU (Engine Control Unit)

The present invention relates to a method for controlling a heating system for a hybrid vehicle, and more particularly, to control a heating system according to heating needs and demands even when the engine is temporarily stopped for fuel efficiency improvement and stopping.

In general, the heating system of the vehicle uses waste heat of the engine coolant for heating the vehicle indoors, and circulation of the coolant for heating to the heater core is driven by a mechanical belt pulley of the engine itself. By (Water Pump)

3 is a perspective view of a cooling / heating system of a conventional vehicle, including a compressor (1), a four-way valve (not shown), first and second heat exchangers (3) (4), an expansion valve (not shown), And a pump unit composed of one or two blowers 5 (not shown), and a heating unit 7 utilizing heat of the engine 6.

When the pump unit is cooled, the compressor 1 compresses the refrigerant, and the compressed refrigerant flows into the first heat exchanger 3 through a four-way valve, and the first heat exchanger 3 and the first blower ( 5) condenses the compressed refrigerant, and the condensed refrigerant is converted into a low temperature and low pressure liquid refrigerant through an expansion valve, and the low temperature and low pressure liquid refrigerant is transferred to the second heat exchanger 4 and the second blower. Is evaporated to lower the air temperature around the second heat exchanger (4).

The air around the second heat exchanger 4 flows into the interior of the vehicle through the second blower and the duct 8 to cool the vehicle.

Next, during heating, the heating unit 7 absorbs a part of the heat generated by the engine 6 to serve as a part of a heat source that heats the air during heating, and the engine 6 to cool the engine 6. Cooling water pipe (6a) is installed to absorb the heat of the engine (6) is installed via), and the valve (6b) for adjusting the amount of the coolant is provided on the flow path of the cooling water pipe (6a), Cooling water circulated along the cooling water pipe 6a releases heat of the cooling water through the heater core 9. Here, the heat released through the heater core 9 heats the air, and the heated air is mixed with the heat released by the pump unit during heating and introduced into the vehicle.

However, the hybrid electric vehicle (HEV) has an automatic idle engine stop function and a fuel cutoff function when traveling or decelerating, so that the engine stops frequently while driving or while the vehicle is stopped. The operation of the water pump also stops, causing a problem in that the vehicle can not be heated indoors.

If the engine stop function is released for heating, the fuel efficiency improvement effect through fuel saving according to the engine stop function of the hybrid vehicle HEV is reduced.

Therefore, in order to solve this problem, an engine coolant circulation means such as an electric water pump independent of engine driving for continuously supplying engine coolant to the heater core and maintaining heating performance even when the engine is stopped has been required.

The present invention corrects the above problems, heating the hybrid vehicle to maintain the heating performance by continuously supplying the engine coolant to the heater core even when the engine stops using the electric water pump of the existing hybrid vehicle without additional hardware configuration It is an object to provide a system control method.

In order to achieve the above object, the present invention is a Full Automated FATC (Hybrid-System Control Unit) for performing energy management and other control of the entire vehicle and the control of the heater to properly maintain the indoor temperature of the vehicle An engine control unit (ECU) for controlling engine driving according to a start / stop command from the HCU and an electric water pump for circulating engine coolant installed for continuous supply of engine coolant to a heater core. In a heating system of a hybrid electric vehicle (HEV);

Collecting indoor / outdoor temperature information in the FATC, collecting operation information of an engine in the ECU, and checking whether a heating request is input from a user; A second step of determining whether to start a heating engine from the information collected in the first step; If it is determined that the engine start is necessary in the second step, it is configured to include a third step of performing a heating water pump drive control.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a flowchart of a control method of a heating system for a hybrid vehicle according to the present invention, in which the FATC measures the indoor / outdoor temperature of the vehicle in the first step S 1, and the ECU detects the coolant temperature of the engine to determine the FATC. To pass on. In addition, the ECU checks the starting state of the engine. In addition, in the FATC, the driver's heating intention, that is, the operation state of the blower is confirmed.

Subsequently, in the second step S 2, the FATC determines whether the engine is required to start from the indoor / outdoor temperature detected in the first step S 1, and makes an engine start request to the HCU if necessary. In addition, when the blower is operated by the driver separately, information about the blower is transmitted to the HCU.

Next, in the third step S 3, the FATC receives the engine starting state collected by the ECU in the first step S 1, so that the engine is currently stopped and the temperature of the engine coolant is higher than the predetermined temperature T1. It determines whether the heating is possible, determines whether the engine can be started, and transmits the information to the HCU.

Next, when the HCU determines that the engine can be started in the third step S3 in the fourth step S4, the ECU requests the engine to start and the ECU starts the engine. As the engine starts, the FATC Drive control of the mechanical water pump of the engine itself. In addition, the ECU monitors this engine starting state and passes it to the HCU and FATC.

Hereinafter, with reference to the accompanying drawings, the operation relationship of the embodiment according to the present invention which is a heating system control method for a hybrid vehicle as described above will be described in detail.

2 is a block diagram illustrating a method for controlling a heating system for a hybrid vehicle according to the present invention in accordance with the configuration of a general hybrid vehicle. The power is distributed, the energy of the entire vehicle is managed and other control is performed. In connection with heating, the engine is requested from the FATC 120 and the state of the blower switch (Blower SW) is received from the ECU 130. Receive engine running status.

FATC 120 is a controller for controlling the heater by receiving the vehicle indoor / outdoor temperature and humidity, heating set temperature, etc. in order to properly maintain the indoor temperature of the vehicle, and also, a blower speed for controlling the wind direction and wind speed And control the damper position, and when heating is requested, the engine is required to be started based on the indoor / outdoor temperature and humidity, and the HCU 110 is requested or requested to be operated, and the water is controlled to control the heater. Drive control of water pump.

On the other hand, ECU 130 is a controller for controlling the EMS (Engine Management System) to control the engine driving in accordance with the engine start / stop command from the HCU (110). The temperature of the engine coolant and the start / stop operation state of the engine are detected and transmitted to the FATC 120.

When the important interface signals for the engine start and stop between the HCU 110 and the FATC 120 and the ECU 130 for heating the hybrid vehicle, and the control of the water pump driving for the heating are summarized again, 1) the engine start / stop request ( Engine Control Request), 2) Blower Switch Input (Blower SW), 3) Engine Coolant Temperature and Engine Operation Status.

Once again, the FATC 120 requests the HCU 110 to start the engine based on the indoor / outdoor temperature of the vehicle when the vehicle needs to be heated indoors by the driver's heating request or when the heating is required by the conditions according to the auto mode. The blower switch (Blower SW) input is transmitted to the HCU 110 so that the heating request can be recognized by the HCU 110 and the ECU 130. At this time, the HCU 110 determines whether the engine can be started according to the engine start request of the FATC 120 and requests the engine 130 to be started by the ECU 130 when the engine can be started.

In addition, the FATC 120 requests the HCU 110 to stop operating the engine to improve vehicle fuel efficiency when the driver stops the heating request or judges based on the indoor / outdoor temperature of the vehicle and does not need heating using the waste heat of the engine coolant. In this case, the HCU 110 needs to operate the engine based on an engine stop request from the FATC 120, an engine driving state, a vehicle driving state, and a high voltage battery (SOC) status of charge (SOC). If not, the engine 130 is requested to stop the engine.

In addition, the FATC 120 cools the coolant if the engine is in a stopped state and the coolant temperature is higher than a predetermined temperature based on the engine operation status and the engine coolant temperature from the ECU 130 when the driver requests heating. Circulating electric water pump drive control is performed, and if the cooling water temperature is below a certain temperature that can be heated, the HCU requests the engine to start the engine and starts the engine to raise the cooling water temperature. Drive to proceed with heating.

Although the present invention as described above has been shown and described with respect to specific embodiments, various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

As described above, the present invention can improve the performance by solving the heating problem during frequent engine stops due to the characteristic of the hybrid vehicle, that is, the engine idle function and the fuel cut off function when traveling or decelerating to improve fuel economy. By implementing the functions without any additional configuration, it is possible to reduce the parts / processes, reduce the cost, and reduce the weight compared to the same functions.

Claims (3)

Hybrid-System Control Unit (HCU), which performs energy management and other control of the entire vehicle, Full Automated Temperature Controller (FAT), which controls the heater to maintain the room temperature of the vehicle properly, and start / stop from the HCU. The Hybrid Electric Vehicle (HEV) includes an engine control unit (ECU) that performs engine drive control according to a command, and includes an electric water pump for circulating engine coolant installed for continuous supply of engine coolant to the heater core. In the heating system, Collecting indoor / outdoor temperature information in the FATC, collecting driving information of an engine in the ECU, and checking whether a heating request is input from a user; A second step of determining whether to start a heating engine from the information collected in the first step; And a third step of performing a heating water pump drive control when it is determined that the engine start is necessary in the second step. The engine start of claim 1, wherein the engine coolant temperature is sensed in the first step by detecting the coolant temperature of the engine. And performing step 2-1 of determining that the operation is possible. The HCU request according to claim 2, wherein the third step comprises: in response to the HCU request when the coolant temperature is lower than or equal to a predetermined temperature in the operation and monitoring of the water pump operation state and the water pump operation state by the FATC and in the step 2-1. A method for controlling a heating system for a hybrid vehicle, characterized by performing operation start / stop of the engine of the ECU.

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