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MMC develops next-generation MIVEC engine, improved Auto Stop&Go system

ABR Staff Writer Published 21 October 2011

Mitsubishi Motors (MMC) has developed two new fuel-saving technologies, the '4J10' lightweight and compact 1.8-liter gasoline engine and the new version of Auto Stop & Go (AS&G) idle-stop technology.

The new 4J10 engine/AS&G combination will power the Japan-market RVR compact SUV, the Galant Fortis sports sedan (Lancer), and Galant Fortis Sportback (Lancer Sportback) 5-door sports hatchback, which will show an improvement of 12% in fuel efficiency.

The new 4J10 MIVEC (Mitsubishi Innovative Valve timing Electronic Control) engine (1.8-liter, inline 4, 16-valve SOHC) incorporates a new version of the company's MIVEC variable valve timing system, it uses next-generation MIVEC system that regulates intake valve lift, opening duration and timing.

The new MIVEC system together with improved combustion stability and a reduction in piston friction provide an improvement in fuel economy without any loss in engine performance (output and torque) compared to the 4B10 MIVEC engine (1.8-liter, inline-4, 16-valve DOHC).

The new 4J10 MIVEC engine is produced at the Shiga Powertrain Plant and the company also plans to introduce it on other models.

The company currently employs the Auto Stop & Go (AS&G) technology on some manual transmission models for the European market, including the ASX (RVR and Outlander Sport in some markets) and the Lancer (Galant Fortis in Japan).

The latest version of the company's AS&G system has been developed for use on models fitted with continuously variable transmissions (CVT).

The company said that the combining of both the technologies provides quick engine restart and initial acceleration performance that feels no different from a car without AS&G.

The new MIVEC engine allows the engine to restart using less intake air and fuel by keeping a low valve lift at engine restart, which improves fuel efficiency.

The new AS&G also controls brake force from engine stop to restart via the car's integrated control system.