Patent EP0421332A2 successfully refreshed from Google Patents.
EP0421332A2
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EP
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Charging control apparatus for vehicle
Assignee: Denso Corp
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Filing: 1990-10-01
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Granted: —
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Expires: 2010-10-01
Abstract
Abstract A charging control apparatus for a vehicle, which controls a power generation of an AC generator for charging a battery (4), comprises: a switching circuit (8) connected in series to a field winding (2) of the generator; a comparator (12, 13) for detecting a voltage of a battery (4) and comparing the battery voltage with a sawtooth wave of a predetermined period; a memory device (50) for storing a value regarding a duty factor of an output of the comparator (13) at the same period as the predetermined period of the sawtooth; a control value increasing/decreasing circuit (60, 70) for increasing or decreasing a control value as an output, thereby making the stored value coincide with the control value; and an AND circuit (14) to calculate AND of the control value and an output of the comparator (13). By controlling the switching circuit (8) by an output of the AND circuit (14), when an electric load (5) is applied the duty factor of a pulsed field current which is supplied to the field winding (2) is gradually increased from the present value of the duty factor, thereby preventing a sudden increase of a load onto the engine.
Inventors
- 👤 Fuyuki Maehara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:11
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24; H02J7/2434; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/92
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
199 words
A charging control apparatus of an AC generator for a vehicle driven by an engine having a stator winding (1) and a field winding (2) and charging a battery (4), comprising: switching means (8) connected in series to the field winding (2); comparing means (12, 13) for detecting a voltage of the battery (4) and comparing the battery voltage with a sawtooth wave of a predetermined period; memory means (50) for storing a value regarding a duty factor of an output of the comparing means (13) at said predetermined period; control value increasing/decreasing means (60, 70) for comparing the value stored in the memory means (50) and a control value, for increasing the control value at said predetermined period when the control value is smaller than the stored value, for decreasing the control value when the control value is larger than the stored value, and for outputting the control value; and AND means (14) for calculating an AND of a value corresponding to the control value which is outputted from the control value increasing/decreasing means (60, 70) and an output of the comparing means (50), wherein the switching means is controlled by an output of the AND means (14).
Claim 2
Dependent Claim
199 words
A charging control apparatus of an AC generator for a vehicle driven by an engine having a stator winding (1) and a field winding (2) and charging a battery (4), comprising: switching means (8) connected in series to the field winding (2); comparing means (12, 13) for detecting a voltage of the battery (4) and comparing the battery voltage with a sawtooth wave of a predetermined period; memory means (50) for storing a value regarding a duty factor of an output of the comparing means (13) at said predetermined period; control value increasing/decreasing means (60, 70) for comparing the value stored in the memory means (50) and a control value, for increasing the control value at said predetermined period when the control value is smaller than the stored value, for decreasing the control value when the control value is larger than the stored value, and for outputting the control value; and AND means (14) for calculating an AND of a value corresponding to the control value which is outputted from the control value increasing/decreasing means (60, 70) and an output of the comparing means (50), wherein the switching means is controlled by an output of the AND means (14).
Claim 3
Dependent Claim
98 words
A charging control apparatus according to claim 1, wherein the memory means is an analog to digital (A/D) converter (50) for digitally converting the value regarding the duty factor of the output of the comparing means (13) at said predetermined period, the control value increasing/decreasing means comprises an up/down counter (70) and a comparator (60), the comparator (60) comparing the A/D converted value with the control value as an output of the up/down counter (70), and the up/down counter (70) being counted up or down at said predetermined period in accordance with the output of the comparator (60).
Claim 4
Dependent Claim
43 words
A charging control apparatus according to claim 1, wherein the control value from the control value increasing/decreasing means (60, 70) is pulse width converted by a pule width converting circuit (80), the pulse width converted signal being inputted to the AND means (14).
Claim 5
Dependent Claim
48 words
A charging control apparatus according to claim 1, wherein the comparing means (13) compares a value corresponding to a difference between the battery voltage and a reference voltage with the sawtooth wave of the predetermined period and outputs a signal of a duty factor of the predetermined period.
Claim 6
Dependent Claim
184 words
A charging control method of controlling by switching means (8) a field current flowing through a field winding (2) of an AC generator for a vehicle which is driven by an engine and charges a battery (4), comprising the steps of: detecting a voltage of the battery (4), comparing a value corresponding to a difference between the battery voltage and a predetermined reference voltage with a sawtooth wave of a predetermined period, and obtaining a value regarding a duty factor in a result of a comparison; storing the value regarding the duty factor in the result of said comparison at said predetermined period; comparing the stored value with a control value, increasing the control value at said predetermined period when the control value is smaller than the stored value, and decreasing the control value when the control value is larger than the stored value; calculating an AND of a value corresponding to the increased or decreased control value and an output of the comparing means (13); and controlling a duty factor with which the switching means (8) operates by the result of said AND.
Claim 7
Dependent Claim
184 words
A charging control method of controlling by switching means (8) a field current flowing through a field winding (2) of an AC generator for a vehicle which is driven by an engine and charges a battery (4), comprising the steps of: detecting a voltage of the battery (4), comparing a value corresponding to a difference between the battery voltage and a predetermined reference voltage with a sawtooth wave of a predetermined period, and obtaining a value regarding a duty factor in a result of a comparison; storing the value regarding the duty factor in the result of said comparison at said predetermined period; comparing the stored value with a control value, increasing the control value at said predetermined period when the control value is smaller than the stored value, and decreasing the control value when the control value is larger than the stored value; calculating an AND of a value corresponding to the increased or decreased control value and an output of the comparing means (13); and controlling a duty factor with which the switching means (8) operates by the result of said AND.
References Cited (Backward Citations)
No citation records indexed.
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