KR-102962274-B1 - COOLING SYSTEM FOR HYBRID VEHICLE AND CONTOL METHD FOR THE SAME

KR102962274B1KR 102962274 B1KR102962274 B1KR 102962274B1KR-102962274-B1

Abstract

The present invention relates to a cooling system for a hybrid vehicle, comprising: an engine; a drive motor; a main water pump that selectively supplies coolant to the engine; a radiator arranged therein; a cooling line communicating with the main water pump; a heat exchanger arranged therein; a heat exchange line communicating with the main water pump; a heater and an exhaust heat recovery device arranged therein; a heater line communicating with the main water pump; a coolant control valve unit communicating with the engine and selectively supplying coolant to the cooling line, the heat exchange line, and the heater line; a bypass line connecting the rear of the exhaust heat recovery device and the front of the heater; an auxiliary water pump that selectively supplies coolant passing through the exhaust heat recovery device to the front of the heater; an operating status signal unit that measures the operating status of the vehicle and outputs a corresponding signal; and a controller that controls the operation of the engine, the drive motor, the main water pump, the coolant control valve unit, and the auxiliary water pump according to the output signal of the operating status signal unit.

Inventors

박정훈
조재만
김경희
이원기

Assignees

현대자동차 주식회사
기아 주식회사

Dates

Publication Date: 20260508
Application Date: 20210610

Claims (15)

engine; Drive motor; A main water pump that selectively supplies coolant to the above engine; A cooling line is configured to have a radiator and communicate with the main water pump; A heat exchanger is installed, and a heat exchange line communicating with the main water pump is provided; A heater and an exhaust heat recovery device are arranged, and a heater line communicating with the main water pump; A coolant control valve unit communicating with the engine and selectively supplying coolant to the cooling line, the heat exchange line, and the heater line; A bypass line connecting the rear of the exhaust heat recovery device and the front of the heater; An auxiliary water pump that optionally supplies cooling water that has passed through the exhaust heat recovery device to the front of the heater; An operating status signal unit that measures the operating status of a vehicle and outputs a corresponding signal; and A controller that controls the operation of the engine, the drive motor, the main water pump, the coolant control valve unit, and the auxiliary water pump according to the output signal of the above-mentioned operating status signal unit; A cooling system for a hybrid vehicle including
In Paragraph 1, The above operating status signal unit An engine coolant temperature sensor that measures the coolant temperature of the engine and outputs a corresponding signal; A heater line cooling water temperature sensor that measures the cooling water temperature of the heater line and outputs a corresponding signal; An oil temperature sensor that measures oil temperature and outputs a corresponding signal; An outdoor temperature sensor that measures the outdoor temperature and outputs the corresponding signal; An accelerator opening sensor that measures the accelerator opening amount and outputs the corresponding signal; A vehicle speed sensor that measures vehicle speed and outputs a corresponding signal; and A position sensor that detects the operation of the above-mentioned coolant control valve unit and outputs a corresponding signal; Includes, A cooling system for a hybrid vehicle in which the controller controls the operation of the coolant control valve unit according to the output signal of the operating status signal unit to regulate whether coolant is supplied to the cooling line, the heat exchange line, and the heater line, and the amount of coolant supplied.
In paragraph 2, The above controller A cooling system for a hybrid vehicle that outputs a signal to drive the auxiliary water pump when it is determined that the supply of coolant to the heater line is stopped according to the output signal of the above-mentioned operating status signal unit.
In paragraph 2, The above controller controls the operation of the coolant control valve unit according to a preset operating mode of the plurality of coolant control valve units, and The above multiple operating modes are Heating priority mode that supplies cooling water only through the above heater line; Flow stop mode that stops the coolant supply; A heat exchange mode that supplies cooling water only through the above heat exchange lines; A heating control mode that supplies cooling water to the heater line while the cooling water flow rate of the heat exchange line is at its maximum; A water temperature control mode for supplying cooling water to the cooling line while the cooling water flow rate of the heat exchange line and the heater line is maximized; and Maximum cooling mode that maximizes the cooling water flow rate through the heat exchange line, the heater line, and the cooling line; A cooling system for a hybrid vehicle including
In Paragraph 4, The above controller Currently, the operating mode of the above-mentioned cooling water control valve unit corresponds to the above-mentioned flow stop mode or the above-mentioned heat exchange mode, or Or if it is determined that the operating mode of the above-mentioned cooling water control valve unit passes through the above-mentioned flow stop mode or the above-mentioned heat exchange mode, The above controller is a cooling system of a hybrid vehicle that drives the above auxiliary water pump.
In paragraph 1, The above auxiliary water pump is A first outlet communicating with the main water pump; and A second outlet communicating with the above bypass line; Includes, A cooling system for a hybrid vehicle, comprising a bypass line connecting the front of the heater and a T-nipple at the connection portion of the heater line.
In paragraph 1, A T-nipple communicating with the bypass line is provided between the auxiliary water pump and the main water pump, and A cooling system for a hybrid vehicle, comprising a bypass line connecting the front of the heater and a T-nipple at the connection portion of the heater line.
In paragraph 1, A cooling system for a hybrid vehicle in which the diameter of the above bypass line is smaller than the diameter of the above heater line.
In a method for controlling a cooling system of a hybrid vehicle according to claim 1, A step in which the controller determines the operating mode of the coolant control valve unit according to the output signal of the operating status signal unit; A step in which the above controller controls the operation of the coolant control valve unit according to the output signal of the above operating status signal unit; A step in which the controller detects the operating state of the coolant control valve unit; A step of determining whether the above controller corresponds to a preset driving condition of the auxiliary water pump; and A step of driving the auxiliary water pump when the above controller corresponds to the driving condition of the above auxiliary water pump; A method for controlling a cooling system of a hybrid vehicle including
In Paragraph 9, A step in which the controller detects the operating state of the coolant control valve unit; A step of determining whether the above controller corresponds to a preset condition for releasing the operation of the auxiliary water pump; and A step of stopping the operation of the auxiliary water pump when the controller corresponds to a condition for releasing the drive of the auxiliary water pump; A method for controlling a cooling system of a hybrid vehicle, further comprising
In Paragraph 10, The operating conditions of the auxiliary water pump set above are The operating mode of the above-mentioned cooling water control valve unit corresponds to a heat exchange mode in which cooling water is supplied only to the heat exchange line, or a heating control mode in which cooling water is supplied to the heater line while the cooling water flow rate of the heat exchange line is at its maximum, or A method for controlling a cooling system of a hybrid vehicle that satisfies the condition that the operating mode of the above-described coolant control valve unit passes through the above-described heat exchange mode or the above-described heating control mode.
In Paragraph 11, A control method for a cooling system of a hybrid vehicle that satisfies the condition for releasing the operation of the auxiliary water pump set above, when such condition does not correspond to the condition for operating the auxiliary water pump set above.
In Paragraph 9, A step in which the controller determines whether the current operating state of the vehicle is an EV driving mode in which it drives using only the drive motor; A step in which, when the current operating state of the vehicle is the EV driving mode, the controller determines whether the heater switch is in the ON state; When the heater switch is in the ON state, the controller determines whether the cooling water temperature of the heater line exceeds a set first cooling water temperature; When the above cooling water temperature exceeds a set first cooling water temperature, the controller controls the cooling water control valve unit to operate in a flow stop mode that stops the supply of cooling water or in a heat exchange mode that supplies cooling water only to the heat exchange line; and The step of the above controller driving the auxiliary water pump; A method for controlling a cooling system of a hybrid vehicle, further comprising
In Paragraph 13, The above controller determines whether the cooling water temperature of the heater line is less than a set second cooling water temperature; and If the cooling water temperature of the heater line is below a set second cooling water temperature, the controller releases the operation of the auxiliary water pump and controls the opening of the cooling water control valve unit; A method for controlling a cooling system of a hybrid vehicle, further comprising
In Paragraph 14, A method for controlling a cooling system of a hybrid vehicle in which the second cooling water temperature is lower than the first cooling water temperature.

Description

Cooling System for Hybrid Vehicle and Control Method for the Same The present invention relates to a cooling system for a hybrid vehicle and a method for controlling the same, and more specifically, to a cooling system for a hybrid vehicle and a method for controlling the same that can prevent damage to an exhaust heat recovery device. In the cooling system of a hybrid vehicle, a coolant control valve unit is used to control the flow of coolant in multiple cooling lines to improve fuel efficiency and rapid engine warm-up. In addition, there are cases where an exhaust heat recovery device is additionally applied to recover exhaust heat in order to improve fuel efficiency. However, depending on the operating state of the vehicle, the coolant control valve unit controls the flow of coolant, but depending on the cooling operation mode, there are cases where coolant does not flow to the exhaust heat recovery device, and damage to the exhaust heat recovery device may occur because coolant does not flow to the exhaust heat recovery device. In other words, the temperature of the tubes inside the exhaust heat recovery device rises rapidly, potentially causing cracks. In addition, in EV mode where the vehicle is driven solely by the motor, if a passenger operates the heater, the engine may be activated to raise the coolant temperature, which can lead to a decrease in fuel efficiency. The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. These drawings are for reference to explain exemplary embodiments of the present invention, and therefore, the technical concept of the present invention should not be interpreted as being limited to the attached drawings. FIG. 1 is a block diagram of a cooling system for a hybrid vehicle according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIG. 3 is a perspective view of a coolant control valve unit that can be applied to a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIGS. 4 to 9 are drawings illustrating the operation of a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIG. 10 is a graph showing the valve opening of a coolant control valve unit that can be applied to a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIG. 11 is a perspective view of an auxiliary water pump that can be applied to a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIG. 12 is a perspective view of a T-nipple that can be applied to a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIG. 13 is a table showing the driving and releasing conditions of an auxiliary water pump of a cooling system of a hybrid vehicle according to an embodiment of the present invention. FIGS. 14 and 15 are flowcharts illustrating a method for controlling a cooling system of a hybrid vehicle according to an embodiment of the present invention. Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. The size and thickness of each component shown in the drawings are depicted arbitrarily for the convenience of explanation, and thus the present invention is not necessarily limited to what is shown in the drawings; furthermore, the thickness has been enlarged to clearly represent various parts and regions. Furthermore, in the detailed description below, the designation of components as "1st," "2nd," etc., is intended to distinguish them due to their identical nature, and is not strictly limited to that order in the description below. Throughout the specification, when a part is described as including a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In addition, terms such as ...part, ...means, etc., as described in the specification refer to a comprehensive unit of composition that performs at least one function or operation. When a part such as a layer, membrane, region, or plate is said to be "on" another part, this includes not only the case where it is directly on top of the other part, but also the case where there is another part in between. Conver