Patent US3741176A successfully refreshed from Google Patents.
US3741176A
Expired / Lapsed
US
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Pulse generator for controlling the valves of an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1971-08-19
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Granted: 1973-06-26
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Expires: 1991-08-19
Abstract
Abstract A pulse generator rotating synchronously with the crank shaft of the engine feeds pulses through a differentiator to a staircase generator of which the output is connected to the inverting inputs of four operational amplifiers acting as threshold switches, the outputs of which are connected to respective inputs of two bistable triggers of which the outputs are connected each to a switching amplifier that controls the inlet or outlet valve of one cylinder of the internal combustion engine. In one modification, the invention is adapted to a four cylinder engine.
Inventors
- 👤 P Schmidt
- 👤 L Raff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:31
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/06; F02P7/061; F01; F01L; F01L9/00; F01L9/20; F02D; F02D41/00; F02D41/24; F02D41/2403; F02D41/30; F02D41/32; F02D41/36; F02D41/365; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
167 words
A pulse generator for operating the electrohydraulic or electropneumatic control for the inlet and outlet valves of an internal combustion engine, comprisinG, in combination, means for generating at least one first and at least one second train of electric pulses in synchronism with the engine speed and having a keying ratio independent of engine speed, each said first pulse train being for operation of a respective inlet valve, and each second pulse train being for operation of a respective outlet valve, said means for generating electric pulses including means for shifting, in degrees of crank shaft rotation, the first and second pulse trains with respect to each other independent of engine speed, said means for generating electric pulses further including an angle of rotation signal generator, a staircase waveform generator connected to said angle of rotation signal generator to receive as input the output thereof, and threshold switch means connected to the output of said staircase generator for controlling at least one inlet and one outlet valve.
Claim 2
Dependent Claim
167 words
A pulse generator for operating the electrohydraulic or electropneumatic control for the inlet and outlet valves of an internal combustion engine, comprisinG, in combination, means for generating at least one first and at least one second train of electric pulses in synchronism with the engine speed and having a keying ratio independent of engine speed, each said first pulse train being for operation of a respective inlet valve, and each second pulse train being for operation of a respective outlet valve, said means for generating electric pulses including means for shifting, in degrees of crank shaft rotation, the first and second pulse trains with respect to each other independent of engine speed, said means for generating electric pulses further including an angle of rotation signal generator, a staircase waveform generator connected to said angle of rotation signal generator to receive as input the output thereof, and threshold switch means connected to the output of said staircase generator for controlling at least one inlet and one outlet valve.
Claim 3
Dependent Claim
67 words
The pulse generator as defined in claim 1, wherein said angle of rotation signal generator includes toothed wheel means mounted to rotate synchronously with the engine crank shaft, the teeth of said wheel means being ferromagnetic, and coil means connected to current and cooperating with the teeth of said wheel means so as to have induced in said coil means electric pulses when said wheel means rotates.
Claim 4
Dependent Claim
47 words
The pulse generator as defined in claim 1, further including switch means connected to said staircase generator for resetting the latter to zero, and means cooperating with the engine crank shaft and with said switch means to close the latter once every rotation of the crank shaft.
Claim 5
Dependent Claim
46 words
The pulse generator as defined in claim 1, wherein said staircase generator includes a binary counter having a plurality of outputs, a resistor of weighted value connected to a respective output, and amplifier means connected to the weighted resistors to receive the voltages thereon as input.
Claim 6
Dependent Claim
16 words
The pulse generator as defined in claim 4, wherein said amplifier means is an operational amplifier.
Claim 7
Dependent Claim
58 words
The pulse generator as defined in claim 1, wherein said threshold switch means includes at least two pairs of threshold switches, each switch of a pair having an electric output, and further including a respective bistable trigger connected to each pair of threshold switches to receive as input the output thereof for controlling a valve of the engine.
Claim 8
Dependent Claim
71 words
The pulse generator as defined in claim 1, including first circuit means for shifting both the leading edge and the trailing edge, independent of the engine speed, of the first and second trains of electric pulses so as to adjust for the delay times t1 and T2, where t1 is the turn on delay time and t2 the turn off delay time of the controls for the inlet and outlet valves.
Claim 9
Dependent Claim
30 words
The pulse generator as defined in claim 7, wherein said first circuit means shifts both pulse edges an amount equal to the larger of said delay times t1 and t2.
Claim 10
Dependent Claim
34 words
The pulse generator as defined in claim 8, wherein said first circuit means shortens a pulse at the leading edge by an amount equal to t2 minus t1 when t2 is greater than t1.
Claim 11
Dependent Claim
34 words
The pulse generator as defined in claim 8, wherein said first circuit means lengthens a pulse at the trailing edge by an amount equal to t1 minus t2, when t1 is greater than t2.
Claim 12
Dependent Claim
49 words
The pulse generator as defined in claim 7, including first and second switch means for operating said first circuit means, and means cooperating with the engine crank shaft and with said first and second switch means for successively closing the latter once during each rotation of the crank shaft.
Claim 13
Dependent Claim
80 words
The pulse generator as defined in claim 11, wherein said first circuit means includes monostable trigger means and first and second bistable trigger means, said first and second bistable trigger means each having first and second inputs, said first switch means being connecteD to the input of said monostable trigger means and to the second input of the first bistable trigger means, said second switch means being connected to the first inputs of said first and second bistable trigger means.
Claim 14
Dependent Claim
22 words
The pulse generator as defined in claim 12, including respective differentiating means connected to each of said first and second switch means.
Claim 15
Dependent Claim
17 words
The pulse generator as defined in claim 13, wherein each said differentiating means is an RC network.
Claim 16
Dependent Claim
78 words
The pulse generator as defined in claim 12, wherein said first circuit means includes a forward and backward counter, said counter having a forward counting input and a backward counting input, a decoder connected to receive as input the output of said counter, said decoder having an output, and AND gate means connecting the two inputs of said counter to the output of said monostable trigger means, and to the output of said angle of rotation signal generator.
Claim 17
Dependent Claim
101 words
The pulse generator as defined in claim 15, wherein said AND gate means includes first, second, and third AND gates, the outputs of said second and third AND gates being connected respectively to said forward counting input and said backward counting input, the output of said first AND gate being connected to one input of each of said second and third AND gates, one input of said first AND gate being connected to the output of said monostable trigger means, and the other input of said first AND gate being connected to the output of said angle of rotation signal generator.
Claim 18
Dependent Claim
46 words
The pulse generator as defined in claim 16, wherein said first bistable trigger means has first and second outputs, and one input of each of said second and third AND gates is connected to respective ones of the two outputs of said first bistable trigger means.
Claim 19
Dependent Claim
38 words
The pulse generator as defined in claim 17, further including an AND gate connecting the output of said decoder and one output of said first bistable trigger means to the second input of said second bistable trigger means.
Claim 20
Dependent Claim
33 words
The pulse generator as defined in claim 7, further including second circuit means for adjusting for the different said delay times t1 and t2 of the controls for the inlet and outlet valves.
Claim 21
Dependent Claim
130 words
The pulse generator as defined in claim 6, further including an OR gate connected to receive as input the output of each said bistable trigger; a monostable trigger connected to receive as input the output of said OR gate; a first AND gate, said gate having first and second inputs respectively connected to the output of one said bistable trigger and to the output of said monostable trigger; a second AND gate, said gate having first and second inputs respectively connected to the output of another said bistable trigger and to the output of said monostable trigger; and first and second switching amplifiers for respective valves of the engine, said switching amplifiers being connected to receive as input the output of respective ones of the first and second AND gates.
Claim 22
Dependent Claim
64 words
The pulse generator as defined in claim 20, further including electronic counter means for obtaining from the control pulses for the first cylinder of the engine the control pulses for the remaining cylinders of the engine, said counter means being connected to receive as input the output of said angle of rotation signal generator and the output of said first and second switching amplifiers.
Claim 23
Dependent Claim
47 words
The pulse generator as defined in claim 21, including a first binary counter, a first decoder, a first ring counter, and a second decoder, all connected in series; a second binary counter, a third decoder, a second ring counter, and a fourth decoder, all connected in series.
Claim 24
Dependent Claim
47 words
The pulse generator as defined in claim 22, wherein the binary counters are forward and backward counters, said binary counters having each a forward counting input, said forward counting input of each said binary counter being connected to the output of said angle of rotatioN signal generator.
Claim 25
Dependent Claim
64 words
The pulse generator as defined in claim 23, wherein each ring counter has a synchronizing input and each binary counter has a zero position input, said synchronizing input of each ring counter being connected directly to the output of said first switching amplifier, and further including a respective AND gate connecting each said zero position input to the output of said first switching amplifier.
Claim 26
Dependent Claim
57 words
The pulse generator as defined in claim 24, further including bistable trigger means; switching amplifier means connected to receive as input the output of said bistable trigger means for controlling further valves of the engine, and wherein the output of each of said second and fourth decoders is connected to the input of said bistable trigger means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |