Engine control method for heating of hybrid electric vehicle

Patent metadata

Field	Value
Publication number	US-10850592-B2
Application number	US-201816216792-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 27, 2017
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

An engine control method for heating of a hybrid electric vehicle, includes collecting information for air conditioning control by a sensor during an operation of a heating, ventilation, and air conditioning (HVAC) device in the hybrid electric vehicle in which forced engine driving for heating is performed, determining whether a condition that requires pre-engine driving as driving in a separate mode from forced engine driving is satisfied based on the collected information, upon determining that the condition that requires the pre-engine driving is required is satisfied, determining whether a condition for allowing the pre-engine driving is satisfied based on engine efficiency and hybrid system efficiency information, and upon determining that the condition for allowing the pre-engine driving is satisfied, performing the pre-engine driving for driving an engine to manage engine coolant temperature.

First claim

What is claimed is:

1. An engine control method for heating of a hybrid electric vehicle, the method comprising:
collecting information for air conditioning control from at least one sensor during operation of a heating, ventilation, and air conditioning (HVAC) device in the hybrid electric vehicle in which forced engine driving and pre-engine driving can be performed for heating;
determining, by a controller, whether a condition that requires the pre-engine driving for heating engine coolant is satisfied based on the collected information;
upon determining that the condition that requires the pre-engine driving is satisfied, determining, by the controller, whether a condition for allowing the pre-engine driving is satisfied based on engine efficiency and hybrid system efficiency information; and
upon determining that the condition for allowing the pre-engine driving is satisfied, performing, by the controller, the pre-engine driving for driving an engine to manage engine coolant temperature,
wherein the determining of whether the condition that requires the pre-engine driving is satisfied comprises:
comparing the engine coolant temperature obtained from the collected information with a predetermined pre-engine driving reference temperature; and
determining that the pre-engine driving is required when a difference between the engine coolant temperature and the predetermined pre-engine driving reference temperature reaches a predetermined temperature difference value;

wherein the predetermined temperature difference value is a variation value determined based on an operation state of an air conditioning blower, an opening degree of a temperature door, and outdoor temperature detected by an outdoor temperature sensor.

2. The method of claim 1 , wherein the forced engine driving for heating is a mode for forcibly driving the engine when the engine coolant temperature is lower than a predetermined temperature required for heating.

3. The method of claim 1 , wherein the forced engine driving for heating is a mode for forcibly driving the engine when a discharge-port air temperature of the HVAC device, which is detected by a sensor, is lower than a predetermined temperature required for heating.

4. An engine control method for heating of a hybrid electric vehicle, the method comprising:
collecting information for air conditioning control from at least one sensor during operation of a heating, ventilation, and air conditioning (HVAC) device in the hybrid electric vehicle in which forced engine driving and pre-engine driving can be performed for heating;
determining, by a controller, whether a condition that requires the pre-engine driving for heating engine coolant is satisfied based on the collected information;
upon determining that the condition that requires the pre-engine driving is satisfied, determining, by the controller, whether a condition for allowing the pre-engine driving is satisfied based on engine efficiency and hybrid system efficiency information; and
upon determining that the condition for allowing the pre-engine driving is satisfied, performing, by the controller, the pre-engine driving for driving an engine to manage engine coolant temperature,
wherein the determining of whether the condition that requires the pre-engine driving is satisfied comprises:
comparing discharge-port air temperature of the HVAC device obtained from the collected information with a predetermined pre-engine driving reference temperature; and
determining that the pre-engine driving is required, when a difference between the discharge-port air temperature of the HVAC device and the predetermined pre-engine driving reference temperature reaches a predetermined temperature difference value,
wherein the predetermined temperature difference value is a variation value determined based on an operation state of an air conditioning blower, an opening degree of a temperature door, and outdoor temperature detected by an outdoor temperature sensor.

5. The method of claim 1 , wherein the determining of whether the condition for permitting the pre-engine driving is satisfied comprises determining that the condition for allowing the pre-engine driving is satisfied when the engine efficiency and the hybrid system efficiency are equal to or greater than predetermined levels, respectively.

6. The method of claim 1 , further comprising stopping the pre-engine driving when the coolant temperature or a discharge-port air temperature of the HVAC device obtained from the collected information during the pre-engine driving is elevated to a predetermined temperature variation value from a time point when the pre-engine driving is started.

7. An engine control method for heating of a hybrid electric vehicle, the method comprising:
collecting information for air conditioning control from at least one sensor during operation of a heating, ventilation, and air conditioning (HVAC) device in the hybrid electric vehicle in which forced engine driving and pre-engine driving can be performed for heating;
determining, by a controller, whether a condition that requires the pre-engine driving for heating engine coolant is satisfied based on the collected information;
upon determining that the condition that requires the pre-engine driving is satisfied, determining, by the controller, whether a condition for allowing the pre-engine driving is satisfied based on engine efficiency and hybrid system efficiency information;
upon determining that the condition for allowing the pre-engine driving is satisfied, performing, by the controller, the pre-engine driving for driving an engine to manage engine coolant temperature; and
stopping the pre-engine driving when the coolant temperature or a discharge-port air temperature of the HVAC device obtained from the collected information during the pre-engine driving is elevated to a predetermined temperature variation value from a time point when the pre-engine driving is started;
wherein the predetermined temperature variation value is determined based on an operation state of an air conditioning blower, an opening degree of a temperature door, and outdoor temperature detected by an outdoor temperature sensor.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Cho In Eok
• Park Jung Soo
• Lee Jang Hyo
• Lee Yong Hoon
• Lee Chun Hyuk
• Park Il Kwon

Classifications

• B60W2530/13

  Mileage · CPC title

• B60Y2300/18091

  Preparing for stopping · CPC title

• B60Y2200/92

  Hybrid vehicles · CPC title

• B60W2520/04

  Vehicle stop · CPC title

• B60W30/181

  Preparing for stopping · CPC title