US4653454A — Method and apparatus for controlling fuel injecti…

Claim 1

Independent Claim 293 words

A method of controlling a fuel injection quantity into cylinders of a diesel engine combined with a fuel injection pump having a solenoid-operated spill valve, comprising the steps of: (a) sensing a plurality of engine operating conditions including an engine rotational speed and an operating amount of an accelerating pedal of said engine; (b) calculating a desired fuel injection quantity into said cylinders of said engine in accordance with the sensed engine operating conditions; (c) deriving a desired spill phase angle of rotation of said pump drive shaft as a function of the calculated fuel injection quantity; (d) producing a reference rotational angle signal at a reference angle of rotation of a drive shaft of said fuel injection pump; (e) producing a rotational angle signal for each predetermined angle of rotation of said drive shaft of said fuel injection pump; (f) obtaining a quotient and a remainder angle by dividing the derived spill phase angle by said predetermined angle; (g) converting the obtained remainder angle into a first converted time on the basis of the sensed engine rotaional speed; (h) counting the number of the rotational angle signals produced after the production of the reference rotational angle signal; (i) comparing the first converted time with a predetermined time; (j) if the first converted time is equal to or smaller than said predetermined time, converting said predetermined angle and said remainder angle into a second converted time; (k) generating a control signal upon the elapse of the second converted time after a counting of a number of rotational angle signals smaller by one than a number thereof which is coincident with the quotient; and (l) supplying said control signal to said solenoid-operated spill valve for cutting off a fuel supply into said engine cylinders.

Claim 2

Independent Claim 293 words

A method of controlling a fuel injection quantity into cylinders of a diesel engine combined with a fuel injection pump having a solenoid-operated spill valve, comprising the steps of: (a) sensing a plurality of engine operating conditions including an engine rotational speed and an operating amount of an accelerating pedal of said engine; (b) calculating a desired fuel injection quantity into said cylinders of said engine in accordance with the sensed engine operating conditions; (c) deriving a desired spill phase angle of rotation of said pump drive shaft as a function of the calculated fuel injection quantity; (d) producing a reference rotational angle signal at a reference angle of rotation of a drive shaft of said fuel injection pump; (e) producing a rotational angle signal for each predetermined angle of rotation of said drive shaft of said fuel injection pump; (f) obtaining a quotient and a remainder angle by dividing the derived spill phase angle by said predetermined angle; (g) converting the obtained remainder angle into a first converted time on the basis of the sensed engine rotaional speed; (h) counting the number of the rotational angle signals produced after the production of the reference rotational angle signal; (i) comparing the first converted time with a predetermined time; (j) if the first converted time is equal to or smaller than said predetermined time, converting said predetermined angle and said remainder angle into a second converted time; (k) generating a control signal upon the elapse of the second converted time after a counting of a number of rotational angle signals smaller by one than a number thereof which is coincident with the quotient; and (l) supplying said control signal to said solenoid-operated spill valve for cutting off a fuel supply into said engine cylinders.

Claim 3

Dependent Claim 31 words

A method as claimed in claim 1, further comprising a step (m) of controlling a generation timing of said control signal in accordance with the variations of the engine operating conditions.

Claim 4

Dependent Claim 38 words

A method as claimed in claim 2, wherein the step (m) includes a step of detecting a variation of the engine operating condition by comparing the present desired spill phase angle with a last desired spill phase angle.

Claim 5

Dependent Claim 66 words

A method as claimed in claim 3, further including a step of generating said control signal immediately after the count value reaches said quotient when the variation of the engine operating condition is detected immediately prior to counting the number of the rotational angle signals equal to said quotient after the counting of the number of the rotational angle signals smaller by one than said quotient.

Claim 6

Dependent Claim 32 words

A method as claim in claim 2, wherein the step (m) includes a step of detecting the variation of the engine operating condition by comparing the converted time with said predetermined time.

Claim 7

Dependent Claim 50 words

A method as claimed in claim 5, further including a step of generating said control signal upon the elapse of said predetermined time after the number of the rotational angle signals is coincident with the quotient when it is detected that the converted time is smaller than said predetermined time.

Claim 8

Independent Claim 317 words

A system for controlling a fuel injection quantity into cylinders of a diesel engine combined with a fuel injection pump having a solenoid-operated spill valve, comprising: (a) first sensor means for sensing engine operating conditions including engine rotational speed and operating amount of an accelerating pedal of said engine; (b) first means for calculating a desired fuel injection quantity into said cylinders of said engine in accordance with the sensed engine operating conditions; (c) second means for deriving a desired spill phase angle of rotation of a drive shaft of said pump as a function of the calculated fuel injection quantity; (d) third means for producing a reference rotational angle signal at a reference angle of rotation of a drive shaft of said fuel injection pump; (e) fourth means for producing a rotational angle signal for each predetermined angle of rotation of said drive shaft of said fuel injection pump; (f) fifth means for obtaining a quotient and a remainder angle by dividing the derived spill phase angle by said predetermined angle; (g) sixth means for converting the obtained remainder angle into a first converted time on the basis of the sensed engine rotational speed; (h) seventh means for counting the number of the rotational angle signals produced after the production of the reference rotational angle signal; means for comparing the first converted time with a predetermined time; means for converting said predetermined angle and said remainder angle into a second converted time if the first converted time is equal to or smaller than said predetermined time; means for generating a control signal upon the elapse of the second converted time after a counting of a number of the rotational angle signals smaller by one than a number thereof which is coincident with the quotient; and means for supplying said control signal to said solenoid-operated spill valve for cutting off a fuel supply into said engine cylinders.

Claim 9

Independent Claim 317 words

A system for controlling a fuel injection quantity into cylinders of a diesel engine combined with a fuel injection pump having a solenoid-operated spill valve, comprising: (a) first sensor means for sensing engine operating conditions including engine rotational speed and operating amount of an accelerating pedal of said engine; (b) first means for calculating a desired fuel injection quantity into said cylinders of said engine in accordance with the sensed engine operating conditions; (c) second means for deriving a desired spill phase angle of rotation of a drive shaft of said pump as a function of the calculated fuel injection quantity; (d) third means for producing a reference rotational angle signal at a reference angle of rotation of a drive shaft of said fuel injection pump; (e) fourth means for producing a rotational angle signal for each predetermined angle of rotation of said drive shaft of said fuel injection pump; (f) fifth means for obtaining a quotient and a remainder angle by dividing the derived spill phase angle by said predetermined angle; (g) sixth means for converting the obtained remainder angle into a first converted time on the basis of the sensed engine rotational speed; (h) seventh means for counting the number of the rotational angle signals produced after the production of the reference rotational angle signal; means for comparing the first converted time with a predetermined time; means for converting said predetermined angle and said remainder angle into a second converted time if the first converted time is equal to or smaller than said predetermined time; means for generating a control signal upon the elapse of the second converted time after a counting of a number of the rotational angle signals smaller by one than a number thereof which is coincident with the quotient; and means for supplying said control signal to said solenoid-operated spill valve for cutting off a fuel supply into said engine cylinders.

Claim 10

Dependent Claim 28 words

A system as claimed in claim 7, further comprising means for controlling a generation timing of said control signal in accordance with variations of the engine operating conditions.

Claim 11

Dependent Claim 37 words

A system as claimed in claim 8, wherein said control means includes means for detecting the variation of the engine operating condition by comparing the present desired spill phase angle with the last desired spill phase angle.

Claim 12

Dependent Claim 65 words

A system as claimed in claim 9, further including means for generating said control signal immediately after the count value reaches said quotient when the variation of the engine operating condition is detected immediately prior to counting the number of the rotational angle signals equal to said quotient after the counting of the number of the rotational angle signals smaller by one than said quotient.

Claim 13

Dependent Claim 31 words

A system as claim in claim 8, wherein said control means includes means for detecting the variation of the engine operating condition by comparing the converted time with said predetermined time.

Claim 14

Dependent Claim 49 words

A system as claimed in claim 11, further including means for generating said control signal upon the elapse of said predetermined time after the number of the rotational angle signals is coincident with the quotient when it is detected that the converted time is smaller than said predetermined time.

Claim 15

Dependent Claim 39 words

A system as claimed in claim 7, wherein said fifth means has a format in which two byte data indicate said quotient and said remainder angle respectively, the least significant bit of the upper byte indicating said predetermined angle.

Claim 16

Dependent Claim 83 words

A system as claimed in claim 7, wherein said third and fourth means comprises a detector having a disk and an electromagnetic pickup, said disk being mounted on said drive shaft of said fuel injection pump and having a plurality of teeth on an outer peripheral surface thereof, said teeth being arranged so as to produce said reference angle signal at said reference angle of rotation of said pump drive shaft and to produce a rotational angle signal at said predetermined angle thereof.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-03-30	1990-09-29	1991-03-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-03-30	1994-09-29	1995-03-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-03-30	1998-09-29	1999-03-31	$7700.00	Window Closed / Lapsed

Method and apparatus for controlling fuel injection quantity into a diesel engine

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