Lawrence M Blaser

US Patent:

42757010, Jun 30, 1981

Filed:

Apr 26, 1979

Appl. No.:

6/033667

Inventors:

Leonard E. Arguello - San Jose CA
Lawrence M. Blaser - Mountain View CA

Assignee:

Fairchild Camera & Instrument Corp. - Mountain View CA

International Classification:

F02P 900

US Classification:

123609

Abstract:

An ignition control system typically used with an automobile engine provides tight feedback control on engine timing. An integrator produces a waveform which is typically dual-slope in response to a timing signal supplied by a sensor responsive to rotation of a distributor. A dwell-control circuit produces a dwell-control reference signal which varies with the integrator waveform voltage at low engine speed. A comparator generates an output drive-control signal when the integrator waveform voltage equals or is less than the dwell-control reference voltage. An output drive circuit produces an activation signal in response to the drive-control signal to activate an output drive circuit which then supplies an ignition signal to an ignition coil. A feedback loop between the output drive circuit and the output drive-control circuit causes the output drive circuit to stabilize at a selected state such as a specified output current level. A feedback loop between the output drive circuit and the dwell-control circuit controls the level of the dwell-control reference voltage and thereby controls the dwell period.

US Patent:

45385858, Sep 3, 1985

Filed:

Aug 2, 1982

Appl. No.:

6/404068

Inventors:

Leonard E. Arguello - Sunnyvale CA
Lawrence M. Blaser - Mountain View CA
Verne H. Wilson - Belmont CA

Assignee:

Fairchild Camera & Instrument Corporation - Mountain View CA

International Classification:

F02P 304

US Classification:

123609

Abstract:

A digital and linear dynamic ignition control apparatus comprising a burn-time counter, a pre-dwell counter, a current limit counter, engine speed detection apparatus, a biasing circuit and an excess current limit circuit is provided for controlling the start of a dwell in each ignition period. In operation, a current limit adjust window is established for each period. The time of the termination of a dwell in the period relative to the current limit adjust window established for the period starts the dwell in the next period relative to the beginning of the next period at a time calculated to optimize engine performance and minimize energy losses. In general, rapid acceleration in a period starts the dwell earlier in the next period to insure adequate charging of the ignition coil. Conversely, rapid deceleration in a period starts the dwell later in the next period to minimize energy losses.

US Patent:

43242162, Apr 13, 1982

Filed:

Jan 9, 1980

Appl. No.:

6/110736

Inventors:

Nicky M. Johnson - Los Altos CA
Lawrence M. Blaser - Mountain View CA

Assignee:

Fairchild Camera & Instrument Corp. - Mountain View CA

International Classification:

F02P 508
F02P 504

US Classification:

123415

Abstract:

An electronic advance and ignition control system incorporating the advance utilizes a fixed advance threshold compared with amplitude of an RPM sensitive input waveform from a distributor in combination with a timing circuit, which establishes a predetermined RPM rate above which the advance operates. The electronic advance accurately duplicates the function of conventional centrifugal and vacuum and advance retard mechanisms in controlling timing of an ignition coil drive signal. The electronic advance is provided as part of an ignition control integrated circuit which can operate in a stand alone mode or share control of the ignition system with a microprocessor through interface circuits also forming part of the integrated circuit.