Power supply control device and control characteristic correction data generation method for power supply control device

Abstract

The invention provides a power supply control device which corresponds with environment changes such as individual offset change, ambient temperature and power supply voltage of an application component and performs high-precision current control in low cost. Correction coefficients corresponding to parameters by which characteristic variation is caused are stored in a data memory (422) of a second integrated circuit element (400A) in which driving open / close elements (45i) respectively connected in series to a plurality of inductive loads (104i) are integrated, and a first integrated circuitelement (200A) that cooperates with the second integrated circuit element suppresses a current control error accompanying individual variation among circuit components and environmental temperature variation by reading present values of the parameters and combining the present values with the correction coefficients. The correction coefficients are calculated by an adjustment tool in a state wherethe second integrated circuit element (400A) is provided singly, and therefore correction data can be generated in relation to a plurality of temperature environments easily.

Description

technical field [0001] The present invention relates to a power supply control device that individually supplies variable load currents to a plurality of inductive loads, and a method for correcting fluctuations in control characteristics caused by individual deviations of circuit components and temperature fluctuations applied to the power supply control device Improvements to the calibration data generation method. Background technique [0002] For example, in the automatic transmission of an automobile, 3 to 6 proportional solenoid valves are used in order to select multiple gears, and it is required to use various target currents to control the energization of one or more proportional solenoid coils (linear solenoid coils) at the same time. And by controlling the energization duty ratio of the power supply switching element connected in series with each proportional electromagnetic coil, high-precision current control matching the target current is performed. [0003] A...

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Problems solved by technology

[0009] In addition, when the current detection resistor is installed on the downstream side of the inductive load, although there is an advantage that the differential amplifier is not required and the fluctuation error of the power supply voltage Vb does not need to be corrected, there is a wiring problem for one inductive load. Compared with the disadvantages of both upstream wiring and downstream wiring, when the current detection resistor is installed on the upstream side of the inductive load, there is an advantage that the downstream wiring can be connected through the vehicle body and thus omitted.

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