Electromechanical apparatus for use with a controllable coupling assembly and coupling and electromechanical control assembly
US-2016377126-A1 · Dec 29, 2016 · US
Method of controlling electric current of linear solenoid valve
US9964163B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9964163-B2 |
| Application number | US-201715448836-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 3, 2017 |
| Priority date | Mar 31, 2016 |
| Publication date | May 8, 2018 |
| Grant date | May 8, 2018 |
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Abstract
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A method of controlling the electric current of a linear solenoid valve by performing pulse width modulation on a coil current for energizing a linear solenoid of the linear solenoid valve to adjust the hydraulic pressure of a working oil in a hydraulic clutch for transmitting and interrupting the rotational drive power from a power source to a drive wheel of a vehicle. The method includes setting the period of the pulse width modulation to a shorter value as the degree to which the hydraulic clutch is engaged increases from a disengaged state thereof. Here, the period of the pulse width modulation may be set in accordance with the variation of a duty ratio depending on the hydraulic pressure corresponding to the degree to which the hydraulic clutch is engaged.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of controlling an electric current of a linear solenoid valve by performing, pulse width modulation on a coil current for energizing a linear solenoid of the linear solenoid valve which is open when energized to adjust the hydraulic pressure of a working oil in a hydraulic clutch for transmitting and interrupting rotational drive power from a power source to a drive wheel of a vehicle, the method comprising: setting a duty ratio to a higher value and setting a period of the pulse width modulation to a shorter value as the degree to which said hydraulic clutch is engaged increases from a disengaged state thereof. 2. A method of controlling an electric current of a normally open linear solenoid valve by performing pulse width modulation on a coil current for energizing a linear solenoid of the linear solenoid valve which is closed when energized to adjust the hydraulic pressure of a working oil in a hydraulic clutch for transmitting and interrupting rotational drive power from a power source to a drive wheel of a vehicle, the method comprising: setting a duty ratio to a lower value and setting a period of the pulse width modulation to a shorter value as the degree to which said hydraulic clutch is engaged increases from a disengaged state thereof. 3. The method of controlling the electric current of the linear solenoid valve according to claim 2 , wherein said period of the pulse width modulation and said duty ratio are set depending on a hydraulic pressure of the working oil in the hydraulic clutch. 4. The method of controlling the electric current of the linear solenoid valve according to claim 3 , wherein said period of the pulse width modulation and said duty ratio are set stepwise to predetermined period values and duty ratio values in respective given ranges of the hydraulic pressure of the working oil in the hydraulic clutch. 5. The method of controlling the electric current of the linear solenoid valve according to claim 1 , wherein the period of the pulse width modulation which is set to the shorter value as the degree to which said hydraulic clutch is engaged increases is set in synchronism with a predetermined control period in an electronic control unit which controls operation of said hydraulic clutch. 6. The method of controlling the electric current of the linear solenoid valve according to claim 2 , wherein the period of the pulse width modulation which is set to the shorter value as the degree to which said hydraulic clutch is engaged increases is set in synchronism with a predetermined control period in an electronic control unit which controls operation of said hydraulic clutch.
Assignees
Inventors
Classifications
Oil pressure · CPC title
Pressure · CPC title
Valves for clutch control systems; Details thereof · CPC title
Pulsed signal; Generating or processing pulsed signals; PWM, width modulation, frequency or amplitude modulation · CPC title
- F16D48/064Primary
Control of electrically or electromagnetically actuated clutches (F16D48/062, F16D48/068 take precedence) · CPC title
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- What does patent US9964163B2 cover?
- A method of controlling the electric current of a linear solenoid valve by performing pulse width modulation on a coil current for energizing a linear solenoid of the linear solenoid valve to adjust the hydraulic pressure of a working oil in a hydraulic clutch for transmitting and interrupting the rotational drive power from a power source to a drive wheel of a vehicle. The method includes sett…
- Who is the assignee on this patent?
- Honda Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F16D48/064. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue May 08 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).