Method of controlling gas heat-pump system

Patent metadata

Field	Value
Publication number	US-11592219-B2
Application number	US-202017130561-A
Country	US
Kind code	B2
Filing date	Dec 22, 2020
Priority date	Dec 23, 2019
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

Proposed is a method of controlling a gas heat-pump system, the system including an air conditioning module having a compressor and indoor and outdoor heat exchangers, and an engine module having an engine combusting mixed gas and thus generating drive power for operating the compressor, the method including: measuring factors that are temperature and humidity of outside air, an rpm of the engine, intake pressure, and an air-fuel ratio, the factors having effects on driving of the engine in an operating environment where the engine is driven; measuring a necessary ignition voltage for an ignition coil in a manner that corresponds to at least one of a plurality of the measured factors; and calculating a dwell time at which the necessary ignition voltage is output by the ignition coil.

First claim

What is claimed is:

1. A method of controlling a gas heat-pump system, the system comprising an air conditioning module having a compressor and indoor and outdoor heat exchangers, and an engine module having an engine combusting mixed gas and thus generating drive power for operating the compressor, the method comprising:
measuring factors that are temperature and humidity of outside air, an rpm of the engine, intake pressure, and an air-fuel ratio, the factors having effects on driving of the engine in an operating environment where the engine is driven;
measuring a necessary ignition voltage for an ignition coil in a manner that corresponds to at least one of a plurality of the measured factors; and
calculating a dwell time at which the necessary ignition voltage is output by the ignition coil.

2. The method of claim 1 , wherein the measuring of the factors comprises:
measuring the temperature of the outside air;
measuring the humidity of the outside air;
measuring the rpm of the engine;
measuring the intake pressure using a pressure sensor provided in an intake manifold; and
measuring the air-fuel ratio, which is a ratio of air weight to fuel weight, in a mixer mixing air and fuel.

3. The method of claim 2 , wherein in the calculating of the dwell time, a dwell adjustment time with respect to each of the factors is selected in a manner that corresponds to a measurement value of each of the factors measured in the measuring of the factors, and the selected dwell adjustment time with respect to each of the factors is added to a reference dwell time to calculate the dwell time.

4. The method of claim 3 , wherein in the calculating of the dwell time, the dwell time is selected from a range of 1.0 to 3.0 ms, and
when a sum of the selected dwell adjustment time with respect to each of the factors and the reference dwell time is 1.0 ms or less, the dwell time is set to 1.0 ms, and when the sum thereof is 3.0 ms or more, the dwell time is set to 3.0 ms.

5. The method of claim 4 , wherein in the calculating of the dwell time, when a value of the temperature measured in the measuring of the temperature falls within a temperature range of −20 to 50° C., a temperature-dependent dwell adjustment time is selected from a range of −0.5 to 0.2 ms.

6. The method of claim 5 , wherein in the calculating of the dwell time, when the value of the temperature measured in the measuring of the temperature is −20° C. or less, the temperature-dependent dwell adjustment time is set to 0.2 ms, and when the value of the temperature measured therein is 50° C. or more, the temperature-dependent dwell adjustment time is set to −0.5 ms.

7. The method of claim 4 , wherein in the calculating of the dwell time, when a value of the humidity measured in the measuring of the humidity falls within a humidity range of 20 to 90%, a humidity-dependent dwell adjustment time is selected from a range of 0 to 0.1 ms.

8. The method of claim 7 , wherein in the calculating of the dwell time, when the value of the humidity measured in the measuring of the humidity is 20% or less, the humidity-dependent dwell adjustment time is set to 0 ms, and when the value of the humidity measured therein is 90% or more, the humidity-dependent dwell adjustment time is set to 0.1 ms.

9. The method of claim 4 , wherein in the calculating of the dwell time, when a value of the rpm measured in the measuring of the rpm falls within a rpm range of 1000 to 2600 rpm, a rpm-dependent dwell adjustment time is selected from a range of 0 to 0.5 ms.

10. The method of claim 9 , wherein in the calculating of the dwell time, when the value of the rpm measured in the measuring of the rpm is 1000 rpm or less, the rpm-dependent dwell adjustment time is set to 0.5 ms, and when the value of the rpm measured therein is 2600 rpm or more, the temperature-dependent dwell adjustment time is set to 0 ms.

11. The method of claim 4 , wherein in the calculating of the dwell time, when a value of the intake pressure measured in the measuring of the intake pressure falls within a pressure range of 400 to 1100 hPa, a pressure-dependent dwell adjustment time is selected from a range of 0 to 0.3 ms.

12. The method of claim 11 , wherein in the calculating of the dwell time, when the value of the intake pressure measured in the measuring of the intake pressure is 400 hPa or less, the pressure-dependent dwell adjustment time is set to 0.3 ms, and when the value of the intake pressure measured therein is 1100 hPa or more, the pressure-dependent dwell adjustment time is set to 0 ms.

13. The method of claim 4 , wherein in the calculating of the dwell time, when a value of the air-fuel ratio measured in the measuring of the air-fuel ratio falls within an air-fuel ratio range of 0.9 to 1.5, an air-fuel ratio-dependent dwell adjustment time is selected from a range of −0.5 to 0.7 ms.

14. The method of claim 13 , wherein in the calculating of the dwell time, when the value of the air-fuel ratio measured in the measuring of the air-fuel ratio is 0.9 or less, the air-fuel ratio-dependent dwell adjustment time is set to −0.5 ms, and when the value of the air-fuel ratio measured therein is 1.5 or more, the air-fuel ratio-dependent dwell adjustment time is set to 0.7 ms.

15. The method of claim 3 , wherein in the calculating of the dwell time, the reference dwell time is set to 1.2 ms.

Assignees

• Lg Electronics Inc

Inventors

• Jang Heejoong
• Jeong Hojong

Classifications

• F25B13/00

  Compression machines, plants or systems, with reversible cycle (defrosting cycles F25B47/02) · CPC title

• F02D2200/0414

  Air temperature · CPC title

• F02P3/045 Primary

  for control of the dwell or anti dwell time · CPC title

• F02D2200/101

  Engine speed · CPC title

• F25B30/02

  of the compression type · CPC title