Go directly to
      Press Release
      February 22, 2021

      Vitesco Technologies Reduces Emissions in High-Voltage Hybrid Vehicles

      • Optimum use of electrification with electrical catalyst heating
      • Vitesco Technologies enters high-voltage vehicles with proven EMICAT solution
      • Crucial technology to avoid cold engine start emissions.
      • New, highly efficient electronics (DC/DC converter) supplies electricity to catalyst heating discs, with the result that emissions are converted immediately
      • The electrical heating technology is already successfully used in 12- / 48-volt hybrids


      Regensburg, February 22, 2021. Vitesco Technologies, a leading international supplier of advanced powertrain technologies and electrification solutions, is now making electrical catalyst heating available in high-voltage hybrid vehicles as well. Thanks to a new DC/DC converter, the heating discs of the electrically heated EMICAT catalyst can now also be supplied with electricity in high-voltage vehicles. It is already in use in vehicles with a pure combustion engine or in mild hybrids.

      For Vitesco Technologies, the novel use of heating technology in the high-voltage sector is an extension of its existing product range. The innovative e-catalyst enables lowest emissions in real operation – something that is becoming increasingly important in light of forthcoming regulations such as Euro 7.

      “Efficient electrification requires intelligent solutions. The perfect combination of our tried-and-tested EMICAT heated catalyst and our new DC/DC converter reduces real emissions in critical situations, namely when the combustion engine is restarted,” says Klaus Hau, Executive Vice President of the Sensing & Actuation business unit at Vitesco Technologies. “With the converter for electrical catalyst heating in plug-in hybrids, we are making an additional option for electrification available to the market.”

      The challenge of plug-in hybrids: CO<sub>2</sub> efficiency and low cold engine start emissions

      Hybrid vehicles utilize their potential for CO2 savings by shutting off the combustion engine as often as possible and using electric power instead. This results in longer operating pauses in the combustion engine during which the vehicle does not emit CO2. During these phases, the engine cools down. If it is required and restarted, the exhaust flow is also cold at first – possibly too cold to convert pollutant gases in the catalyst. “In other words, the cold start is actually the rule, especially with efficiently-driven hybrids,” says Rolf Brück, head of Catalysts and Filters at Vitesco Technologies. “From the perspective of emission reduction, this is a challenge, as the greatest share of the emissions in a cycle can be generated during cold start situations.” If you want to make the best possible use of electrification in a vehicle to save CO2, a solution is required for all cold start events.

      This form of exhaust gas aftertreatment has so far not been available for high-voltage hybrids – such as the increasingly popular plug-in hybrid – because the heating disc cannot be supplied directly from the high-voltage system at 200-450 V. The newly-developed DC/DC converter now generates the low voltage and power for the heating disc from the high voltage of the drive system. The compact unit is based on state-of-the-art printed circuit board technology and the latest components with small dimensions, and enables a high degree of efficiency of 95%.

      The system solution, consisting of heating disc and DC/DC converter, upgrades exhaust-gas aftertreatment systems for even stricter emission standards worldwide in the future. 

      “The converter is designed in such a way that it can even supply multi-flow exhaust systems with multiple heating discs via separate outputs,” adds Alexander Reich, head of Product Management High Voltage Electronics at Vitesco Technologies. The likely start of production is 2023. “In the medium term, our DC/DC converter technology has the potential to supply other high-power consumers in the vehicle. Possible examples include electric roll stabilization or the electric steering assistance,” Reich adds.

      Vitesco Technologies is one of only a few suppliers worldwide to offer the full range of electronics, software and system integration for powertrain electrification. The portfolio of innovative solutions for 48-volt systems and plug-in hybrids up to completely battery-based electric drives is correspondingly large. Examples include highly complex power electronics, intelligent sensor technologies, integrated axle drives as well as battery, energy and thermal management systems. This bandwidth makes it possible to supply fully developed individual components and at the same time develop sophisticated holistic systems - all from a single source.

      Available documents

      Cookie Policy

      We use cookies to provide you with the best experience on our website. Click on "Accept all" to allow all cookies or "Change cookie settings" to decide individually.

      Note: If you consent to the use of performance cookies, you also consent to the transfer of your personal data to insecure third countries (e.g. to the USA). These insecure third countries do not provide a level of data protection comparable to EU standards. In the case of certain third party providers, such as Google and Mouseflow, no other guarantees are offered to compensate for this deficit. There is therefore a risk that the transmission of your personal data may result in state authorities accessing your personal data without you having effective legal protection options.

      For more information on performance technologies and the transfer of data to third countries, please refer to the privacy policy.

      By clicking the "Accept all" button, you explicitly consent to this. Consent can be revoked at any time by changing the cookie settings. The further processing of data already collected before revocation by the third-party provider cannot be excluded.

      A cookie is a small data file that is stored on your device. We use cookies to provide basic and convenience functionalities, measure website performance and analyze user behavior on the website. 

      Required cookies are always activated because they are indispensable for the operation of the website and to store your cookie consent. Functional and performance cookies are optional. All optional cookies are deactivated by default.

      You can change your cookie settings at any time by visiting our Cookie Policy or by clearing the cache in your browser. 

      Show more Show less
      Required cookies Required

      These cookies are required to provide you with key functions.

      Functional cookies

      These cookies are used to provide certain functionalities to you.

      Performance cookies

      These cookies are used to measure website performance and user behavior. All collected data are analyzed anonymously.