Current control system for linear solenoid
First Claim
1. A current control system for a linear solenoid for feedback-controlling an output voltage value on the basis of a difference between a command current value to the linear solenoid, as set according to a vehicle running state, and a feedback current value, as produced by monitoring a current value actually passing through the linear solenoid, comprising:
- decision means for deciding whether or not the resistance value of the linear solenoid can be calculated;
real resistance value calculating means for calculating a real resistance value of said linear solenoid on the basis of a signal coming from said decision means, said command current value and said output voltage value;
comparison means for comparing the calculated real resistance value and a resistance value in a memory unit; and
correction means for correcting the resistance value in said memory unit on the basis of the comparison result of said comparison means,wherein said output voltage value is outputted on the basis of the corrected resistance value.
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Accused Products
Abstract
A current control system for a linear solenoid for feedback-controlling an output voltage value on the basis of a difference between a command current value to the linear solenoid, as set according to a vehicle running state, and a feedback current value, as produced by monitoring a current value to be really fed to the linear solenoid, including: a decision circuit that decides whether or not the resistance value of the linear solenoid can be calculated; a real resistance value calculating circuit that calculates a real resistance value on the basis of a signal coming from the decision circuit, the command current value and the output voltage value; a comparison circuit that compares the calculated real resistance value and a resistance value in a memory unit; and a correction circuit that corrects the resistance value in the memory unit on the basis of the comparison result from the comparison circuit. The output voltage value is outputted on the basis of the corrected resistance value.
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Citations
12 Claims
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1. A current control system for a linear solenoid for feedback-controlling an output voltage value on the basis of a difference between a command current value to the linear solenoid, as set according to a vehicle running state, and a feedback current value, as produced by monitoring a current value actually passing through the linear solenoid, comprising:
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decision means for deciding whether or not the resistance value of the linear solenoid can be calculated; real resistance value calculating means for calculating a real resistance value of said linear solenoid on the basis of a signal coming from said decision means, said command current value and said output voltage value; comparison means for comparing the calculated real resistance value and a resistance value in a memory unit; and correction means for correcting the resistance value in said memory unit on the basis of the comparison result of said comparison means, wherein said output voltage value is outputted on the basis of the corrected resistance value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A current control system for a linear solenoid for feedback-controlling an output voltage value on the basis of a difference between a command current value to the linear solenoid, as set according to a vehicle running state, and a feedback current value, as produced by monitoring a current value actually passing through the linear solenoid, comprising:
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temperature detecting means for detecting an oil temperature of an automatic transmission; real resistance value setting means for setting a real resistance value of the linear solenoid on the basis of the detected oil temperature; comparison means for comparing the set real resistance value and a resistance value in a memory unit; and correction means for correcting the resistance value in said memory unit on the basis of the comparison result of said comparison means, wherein said output voltage value is outputted on the basis of the corrected resistance value.
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9. A current control system for a linear solenoid, comprising:
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a solenoid current monitoring circuit; a command current setting circuit that receives input from a vehicle running state sensor and that outputs a command current value; a resistance calculating circuit that inputs said command current value and that inputs an output voltage value, with said resistance calculating circuit outputting a corrected real resistance value; a comparison circuit that inputs said corrected real resistance value an d a stored resistance value, and that outputs a difference in resistance between said corrected real resistance value and said stored resistance value; and a correction circuit that adjusts said stored resistance value based on said difference in resistance and that outputs a corrected output voltage value calculated using said adjusted resistance value to said resistance calculating circuit. - View Dependent Claims (10)
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11. A method of feedback controlling an output voltage provided to a linear solenoid, said method including the steps of:
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determining a command current value that must be supplied to the linear solenoid in order to produce a desired transmission oil pressure based on a vehicle running state; calculating a real resistance value of the linear solenoid based on said command current value and an output voltage value; comparing said real resistance value with a resistance value of the linear solenoid that is stored in memory; correcting the stored resistance value based upon comparison results from said comparing step; and determining an updated output voltage value for use in said calculating step based upon a corrected resistance value produced in said correcting step. - View Dependent Claims (12)
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Specification