Waltham, MA, United States
Waltham, MA, United States

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Patent
Tecogen | Date: 2017-04-19

A system and method for controlling an internal combustion engine and electrical inverter system for powering a load, including controlling the operation of a spark-ignited internal combustion engine prime mover used in generation of electrical power by way of a generator. A microprocessor (e.g., DSP) controlled circuit taking engine speed input from an engine speed signal is used to control the operation of the internal combustion engine prime mover so that it is preferably operated substantially at wide open throttle.


News Article | February 22, 2017
Site: www.prnewswire.com

WALTHAM, Mass., Feb. 22, 2017 /PRNewswire/ -- Tecogen® Inc. (the "Company", NASDAQ: TGEN) today announced that Alan B. Welch will join the Research & Development team as Project Manager. A mechanical engineer with over 30 years of experience developing and managing automotive,...


A system for reducing ammonia in exhaust gas generated from a lean burn internal combustion engine includes an oxidation catalyst, a selective reduction catalyst (SCR), a cooling unit, and a three-way catalyst. Exhaust gas generated by the engine passes through the oxidation catalyst to oxidize carbon monoxide from the exhaust gas to form carbon dioxide. Nitrous oxide (NOx) compounds in the exhaust gas are reduced in the SCR to form nitrogen and water. The exhaust gas is then cooled in a cooling unit and then passed over the three-way catalyst. The three-way catalyst causes ammonia in the cooled exhaust stream to react to form less harmful compounds, such as nitrogen and water.


Methods and apparatus for removing undesired pollutants from exhausts streams of spark-ignited internal-combustion engines in vehicles while producing electrical energy as a byproduct. The apparatus includes a reduction catalyst, a thermoelectric generator (TEG), and an oxidation catalyst. The TEG cools the exhaust stream and generates electricity. The exhaust stream is oxygenated after passing through the TEG and prior to passing through the oxidation catalyst.


Patent
Tecogen | Date: 2016-03-24

A poison-resistant catalytic converter includes a washcoat having a support material comprised of titania and/or silica and a plurality of platinum group metal particles disposed in the support material. The washcoat is disposed on a substrate having a plurality of cells that define respective apertures. The catalytic converter is resistant to poisoning from sulfur and phosphorous compounds while operating at low temperatures. Applications include spark ignited internal combustion engines in combined heat and power systems, vehicles, combustion turbines, boilers and other applications for utilities, industry and vehicle emissions control.


An assembly and method for reducing nitrogen oxides, carbon monoxide and hydrocarbons in exhausts of internal combustion engines, wherein the exhaust is acted upon in a first stage catalytic converter. A first portion of the first stage catalytic converter output is cooled and a second portion of the catalytic converter output is not cooled. The cooled and not cooled exhausts are united and directed to a second stage catalytic converter. Air is injected into a selected one of (1) the not cooled exhaust prior to the juncture thereof with the cooled exhaust, and (2) the combined cooled and not cooled exhausts after the juncture thereof.


An assembly and method for reducing nitrogen oxides, carbon monoxide and hydrocarbons in exhausts of internal combustion engines, wherein the exhaust is acted upon in a first stage catalytic converter. A first portion of the first stage catalytic converter output is cooled and a second portion of the catalytic converter output is not cooled. The cooled and not cooled exhausts are united and directed to a second stage catalytic converter. Air is injected into a selected one of (1) the not cooled exhaust prior to the juncture thereof with the cooled exhaust, and (2) the combined cooled and not cooled exhausts after the juncture thereof.


A method of operating a catalytic system for reducing emissions from a rich burn spark-ignited engine, comprising controlling intake air and fuel (AFR) to produce first exhaust gases substantially free of oxygen; passing said first exhaust gases into a first-stage catalyst chamber containing a three-way catalyst (TWC) operating above 800 F, which minimizes NOx content by reducing NOx (to N_(2) and O_(2)). Further, passing exhaust gases exiting from the first-stage catalyst chamber to an inter-stage cooling chamber having cooling means, and cooling by-pass means, which are used to adjust gas temperature to a controlled Tmix = 390 - 520 F, as well as secondary air injection means, which enriches the oxygen content to about 0.25 - 1.0%; passing exhaust gases exiting from the inter-stage cooling chamber to a second-stage catalyst chamber containing a catalyst that minimizes CO content by oxidizing CO to CO_(2).


News Article | March 2, 2017
Site: www.prnewswire.com

WALTHAM, Mass., March 2, 2017 /PRNewswire/ -- Tecogen® Inc. (NASDAQ: TGEN) will release its financial results for the year ended December 31, 2016 before the market opens on Wednesday, March 22, 2017.  The earnings press release and supplemental earnings call slides will be available...


News Article | February 28, 2017
Site: www.prnewswire.com

WALTHAM, Mass., Feb. 28, 2017 /PRNewswire/ -- Tecogen® Inc. (NASDAQ: TGEN), provider of clean energy products which, through patented technology, nearly eliminate criteria pollutants and significantly reduce a customer's carbon footprint, today announced the sale of six CM-75 combined...

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