Derek K Stevens

US Patent:

20130319377, Dec 5, 2013

Filed:

Jun 5, 2012

Appl. No.:

13/489134

Inventors:

Derek Stevens - Redondo Beach CA, US

Assignee:

HONDATA, INC. - Torrance CA

International Classification:

F02D 41/04

US Classification:

123480

Abstract:

The present invention utilizes a speed density method for determining the cylinder air mass using volumetric efficiency (VE) based on engine speed and manifold pressure. The VE data contain the cylinder filling efficiency for various engine speed and manifold pressure values. The manifold pressure is then measured by a manifold absolution pressure (MAP) sensor. Using the speed density has the advantage that it is much less affected by pulsation in the intake system of the vehicle, and does not require a linear air flow past a sensor in the engine intake system.

US Patent:

20190093582, Mar 28, 2019

Filed:

Sep 28, 2017

Appl. No.:

15/718448

Inventors:

- Torrance CA, US
Derek Stevens - Redondo Beach CA, US

International Classification:

F02D 41/14
F02D 41/18

Abstract:

A method for an engine control unit to conduct real time updating of data tables based on feedback from the air flow sensor without external computing. The air fuel ratio is based on information received from an air flow meter, where a look-up table is actively tuned for the air flow calibration instead of the volumetric efficiency tables. Here, the look-up table involves a single dimension value so the calculations are simpler than more complex evaluations previously set forth.

US Patent:

20150006066, Jan 1, 2015

Filed:

Jun 27, 2013

Appl. No.:

13/928802

Inventors:

- Torrance CA, US
Derek Stevens - Redondo Beach CA, US

International Classification:

F02D 43/00

US Classification:

701115

Abstract:

A method for an engine control unit to update internal tables based on feedback from the engine without external computing, comprising the steps of establishing flash memory and RAM memory in the ECU, assigning a portion of the RAM memory to storage of a table of engine conditions from the flash memory, updating all program code pointers to the table to read the table from the assigned portion of RAM, and revise the table in RAM based on input received from the engine sensors.

US Patent:

20140222308, Aug 7, 2014

Filed:

Feb 1, 2013

Appl. No.:

13/757542

Inventors:

- Torrance CA, US
Derek Stevens - Redondo Beach CA, US

Assignee:

HONDATA, INC. - Torrance CA

International Classification:

B60W 30/18

US Classification:

701 84

Abstract:

A method for controlling wheel slip comprising determining an actual wheel slip of a set of driven wheels on a vehicle, adjusting the actual wheel slip for cornering distortion, setting a target slip condition using a traction control unit with a multi-position switch depending upon road conditions, calculating overslip of the wheels, and retarding an engine output to minimize overslip, and an apparatus for accomplishing same.