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Jacobs Vehicle Systems has been leading the development of engine braking technology for more than 50 years. In order to meet the need for significantly increased vehicle retarding capability, the company focused on the development of a High Power Density (HPD) braking system. Overall vehicle retarding requirements are continuously increasing due to vehicle changes that improve fuel economy, such as increases in aerodynamic efficiency and decreases in rolling resistance, which in turn, reduce the vehicle's natural retarding. This increase in overall vehicle retarding needs comes at a time when the trend is to operate at lower engine RPM's combined with downsizing of engine displacement to improve fuel economy and reduce CO₂ emissions. The smaller displacement engine will clearly produce less retarding power than the larger engine it is replacing with standard engine braking technology.

An integrated engine subsystem incorporating Internal Exhaust Gas Recirculation (IEGR) or alternatively referred to as Pulse EGR™ and Compression Release Retarding (CRR) functions has been developed and introduced to production with the new E13C engine from Hino Motors Ltd. This new system provides the nitrous oxide (NOX) reduction benefit of IEGR and the vehicle control and brake saving benefits of CRR in a single integrated package, without the need for increased vehicle cooling capacity or additional components external to the engine. The product is a result of a close cooperation between two companies, Hino Motors Ltd. of Japan and Jacobs Vehicle Systems, Inc. of the U.S.A.