Method and temperature transmission compensation

Patent metadata

Field	Value
Publication number	US-10260536-B2
Application number	US-201615144348-A
Country	US
Kind code	B2
Filing date	May 2, 2016
Priority date	Mar 21, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A method is disclosed for determining off-temperature behavior of a solenoid fluid control valve. The method comprises performing a current sweep at a first temperature. The method further comprises choosing a first and second characterization control pressure for characterizing the solenoid fluid control valve. A first current may be determined that corresponds to the first characterization control pressure based on the current sweep, and a first metric may be assigned to the solenoid fluid control valve based on the first current. A second current corresponding to the second characterization control pressure may be determined based on the current sweep, and a second metric may be assigned to the solenoid fluid control valve based on the second current. Information regarding the behavior of the solenoid fluid control valve at a second temperature may be determined based on the first and second metrics.

First claim

What is claimed is:

1. A method for determining a behavior of a solenoid fluid control valve, the method comprising:
performing a current sweep that comprises running a current through a coil of the solenoid fluid control valve and measuring a control pressure as a function of the current, wherein the current sweep is performed at a first temperature;
choosing a first characterization control pressure for characterizing the solenoid fluid control valve;
determining a first current corresponding to the first characterization control pressure based on the current sweep;
assigning a first metric to the solenoid fluid control valve based on the first current;
and
determining information regarding a behavior of the solenoid fluid control valve at a second temperature based on the first metric.

2. The method of claim 1 , wherein the first temperature is a normal operating temperature of the solenoid fluid control valve.

3. The method of claim 1 , wherein the first metric is one of three possible first metrics.

4. The method of claim 1 , further comprising:
choosing a second characterization control pressure for characterizing the solenoid fluid control valve;
determining a second current corresponding to the second characterization control pressure based on the current sweep;
assigning a second metric to the solenoid fluid control valve based on the second current; and
determining information regarding a behavior of the solenoid fluid control valve at a second temperature based on the first and second metrics.

5. The method of claim 4 , further comprising:
choosing a third characterization control pressure;
determining a third current corresponding to the third characterization control pressure based on the current sweep;
assigning a third metric to the solenoid fluid control valve based on the first current; and
determining information regarding the behavior of the solenoid fluid control valve at the second temperature based on the first, second, and third metrics.

6. The method of claim 1 wherein the information regarding the behavior of the solenoid fluid control valve at the second temperature is a current corresponding to a control pressure.

7. The method of claim 1 wherein the information regarding the behavior of the solenoid fluid control valve at the second temperature is a control pressure corresponding to a known current.

8. The method of claim 1 wherein the information regarding the behavior of the solenoid fluid control valve at the second temperature is determined based on a look-up table.

9. The method of claim 8 wherein the look-up table contains an average of measured data from a plurality of solenoid fluid control valves.

10. The method of claim 9 wherein the data is measured at the second temperature.

11. The method of claim 9 wherein each of the plurality of solenoid fluid control valves has a same first metric as the solenoid fluid control valve.

12. The method of claim 1 further comprising defining a first range of possible values for the first current.

13. The method of claim 12 further comprising dividing the first range into a first number of regions.

14. The method of claim 4 further comprising defining a first range of possible values for the first current, and defining a second range of possible values for the second current.

15. The method of claim 14 further comprising dividing the first range into a first number of regions, and dividing the second range into a second number of regions.

16. The method of claim 15 wherein the first number and second number are equal.

17. The method of claim 13 where each of the first number of regions corresponds to a first metric of a plurality of possible first metrics.

18. The method of claim 1 , wherein the first characterization control pressure corresponds to a low flow region.

19. The method of claim 4 , wherein first characterization control pressure corresponds to a first flow region and the second characterization control pressure corresponds a second flow region, wherein the first flow region has a relatively lower flow than the second flow region.

20. The method of claim 1 , further comprising including an indication of the first metric on a casing of the solenoid fluid control valve.

Assignees

• Flextronics Ap Llc

Inventors

• Najmolhoda Hamid
• Seid David

Classifications

• F16D2500/3024

  Pressure · CPC title

• F15B21/045

  Compensating for variations in viscosity or temperature · CPC title

• F16K37/0083

  by measuring valve parameters · CPC title

• F16D48/06

  Control by electric or electronic means, e.g. of fluid pressure · CPC title

• G01L19/04

  Means for compensating for effects of changes of temperature {, i.e. other than electric compensation} · CPC title