Method and apparatus for rewriting data of control unit for vehicle
First Claim
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1. A method of rewriting data of a control unit for a vehicle which stores learning data for vehicle control in a control memory which is electrically erasable and programmable, comprising the steps of:
- inputting information of parts that have been exchanged among parts of sensors outputting detection signals to said control unit for the vehicle and among parts controlled by said control unit for the vehicle;
judging learning data which correlate to said parts exchanged among learning data for vehicle control stored in said control memory;
reading an initial value of learning data correlating to said parts exchanged out of initial values pre-stored for each of said learning data; and
rewriting to said initial value, said learning data which correlate to said parts exchanged among the learning data for vehicle control stored in said control memory.
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Abstract
When a vehicle control unit is to be exchanged, out of learning data stored in a control memory of the control unit to be exchanged, the learning data correlating to vehicle parts to be exchanged at the same time are corrected to initial values, and the learning data after correction processing are written to a control memory of a new control unit.
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Citations
12 Claims
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1. A method of rewriting data of a control unit for a vehicle which stores learning data for vehicle control in a control memory which is electrically erasable and programmable, comprising the steps of:
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inputting information of parts that have been exchanged among parts of sensors outputting detection signals to said control unit for the vehicle and among parts controlled by said control unit for the vehicle;
judging learning data which correlate to said parts exchanged among learning data for vehicle control stored in said control memory;
reading an initial value of learning data correlating to said parts exchanged out of initial values pre-stored for each of said learning data; and
rewriting to said initial value, said learning data which correlate to said parts exchanged among the learning data for vehicle control stored in said control memory. - View Dependent Claims (2, 3, 4)
judging whether or not said control unit for the vehicle is to be exchanged;
transferring to a control memory of a new control unit for the vehicle, learning data except for those which correlate to parts to be exchanged from among learning data for vehicle control stored in a control memory of an old control unit for the vehicle, when said old control unit for the vehicle is exchanged, and then writing the transferred learning data in the control memory of the new control unit; and
transferring to the control memory of the new control unit for the vehicle, an initial value of the learning data which correlate to the parts to be exchanged, and then writing the transferred initial value in the control memory of the new control unit.
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5. A method of rewriting data of a control unit for a vehicle which stores learning data for vehicle control in a control memory which is electrically erasable and programmable, wherein said vehicle control unit mounted on a vehicle judges whether or not operating parts of the vehicle are operated in pre-set patterns, comprising the steps of:
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when judging that the operating parts of the vehicle are operated in said pre-set patterns, recognizing said operation as a trigger signal for transferring said learning data for vehicle control; and
when recognizing the operation as said trigger signal, transferring said learning data for vehicle control to a new control unit for the vehicle to be exchanged which is communicably connected to the vehicle control unit mounted on the vehicle, and then writing said learning data in the new control unit. - View Dependent Claims (6, 7, 8)
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9. An apparatus for rewriting data of a control unit for a vehicle which stores learning data for vehicle control in a control memory which is electrically erasable and programmable, said apparatus comprising:
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input means for inputting information of parts that have been exchanged among parts of sensors outputting detection signals to said control unit for the vehicle and among parts controlled by said control unit for the vehicle;
judging means for judging learning data which correlate to said parts exchanged among learning data for vehicle control stored in said control memory;
reading means for reading an initial value of learning data correlating to said parts exchanged out of initial values pre-stored for each of said learning data; and
rewriting means for rewriting to said initial values, said learning data which correlate to said parts exchanged among the learning data for vehicle control stored in said control memory. - View Dependent Claims (10, 11, 12)
unit exchange judging means for judging whether or not said control unit for the vehicle is to be exchanged;
first writing means for transferring to a control memory of a new control unit for the vehicle, learning data except for those which correlate to parts to be exchanged from among learning data for vehicle control stored in a control memory of an old control unit for the vehicle, when said old control unit for the vehicle is exchanged, and then writing the transferred learning data in the control memory of the new control unit; and
second writing means for transferring to the control memory of the new control unit for the vehicle, an initial value of the learning data which correlate to the vehicle parts to be exchanged, and then writing the transferred initial value in the control memory of the new control unit.
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Specification
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Current AssigneeHitachi, Ltd.
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Original AssigneeUnisia Jecs Corporation (Hitachi, Ltd.)
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InventorsOhkubo, Tatsuji
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Primary Examiner(s)Nguyen, Tan Q.
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Assistant Examiner(s)Tran, Dalena
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Application NumberUS09/641,680Time in Patent Office963 DaysField of Search701/1, 701/34, 701/35, 701/29, 123/486, 123/479, 123/690, 123/674, 123/339.1, 123/361, 714/10, 714/11, 714/23, 714/55, 714/752, 714/820, 714/46, 714/6, 714/13US Class Current701/35CPC Class CodesF02D 41/2425 Particular ways of programm...F02D 41/2454 Learning of the air-fuel ra...F02D 41/2493 Resetting of data to a pred...
