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New Honda CR-V: Engines & transmissions

New Honda CR-V crossover SUV: New CR-V: 6-speed manual or 5-speed automatic (depending on markets).

New CR-V: 6-speed manual or 5-speed automatic (depending on markets).

APN,
27 September 2006.

Depending on market preferences, the new Honda CR-V will be launched with different engine and transmission options.

In Europe, power is provided by a 2.0-litre petrol or a 2.2 diesel engine, while the U.S. market CR-V gets the 2.4-litre petrol engine with better output and lower emissions than previously.

Hondas 2.2-litre i-CTDi diesel continues unchanged, with power and torque figures of 140PS / 4000rpm and 340Nm/2000rpm; but with the new CR-Vs aerodynamic efficiency improved by 12 per cent, Honda says that fuel economy gets better.

New Honda CR-V crossover SUV: U.S. CR-V with 2.4-litre engine, producing 166 horsepower (+10hp).

U.S. CR-V with 2.4-litre engine, producing 166 horsepower (+10hp).

The 2.0-litre petrol engine is an all-new unit based on the 1.8-litre SOHC i-VTEC of the Civic range. It features the latest VTEC and friction reduction technologies, plus a delayed closure of the intake valves combined with a wide open throttle valve during low-load driving conditions to reduce pumping losses and boost fuel economy.

Petrol engine models are also equipped with brand new transmissions: either a 6-speed manual (Europe) or an optional 5-speed automatic (standard in the U.S.).

Maximum power and torque figures for the 2.0-litre petrol engine are 110 kW/150 PS at a slightly lower 6,200 rpm, with 190 Nm at 4,200 rpm with greater efficiency, improved body aerodynamics and new gearboxes to boost fuel economy. Performance is also enhanced, with the 0 to 100 km/h time dropping from 10.8 to 10.2 seconds (manual) and from 13.1 to 12.2 seconds (automatic).

New Honda CR-V crossover SUV: 2.2-litre i-CTDi diesel for Europe.

2.2-litre i-CTDi diesel with 140PS / 4000rpm and 340Nm/2000rpm.

In the U.S. market, the 2007 Honda CR-V engine is a dual overhead cam (DOHC) all-aluminium, 2.4-litre inline four-cylinder with 16 valves and a high-volume intake manifold. The engine produces 166 horsepower at 5800 rpm (156hp/5900rpm in the previous generation) and torque is rated 161 lb-ft. (218Nm) at 4200 rpm. Primary enhancements for 2007 include a slightly higher compression ratio (9.7:1 from 9.6:1) along with optimized valve timing and higher flow rate intake and exhaust systems with a broadened torque output.

The i-VTEC "intelligent" valve-control system combines VTC (Variable Timing Control) - which continuously adjusts camshaft phase with Variable Valve Timing and Lift Electronic Control (VTEC) which changes valve lift, timing, and duration. The CR-V engine meets strict California Air Resource Board (CARB) Ultra Low Emission Vehicle-2 (LEV II ULEV) tailpipe emissions standards and Federal Tier 2-Bin 5 emission standards. Engine, fuel tank and catalytic converter enhancements help the 2007 CR-V lower evaporative emissions by 75 percent.

EPA data for city/highway fuel consumption is 23/30 U.S. mpg (10.23/7.84 litres / 100km) for the front-wheel drive versions, while the 4WD versions get 22/28 U.S. mpg (10.69/8.40 litres / 100km), all with the standard 5-speed automatic transmission.

New Honda CR-V crossover SUV: multi-plate clutch.

A multi-plate clutch connects the propeller shaft to the rear differential.

Drive system - Basically, the CR-V is a front-wheel drive car. The optional fully automatic Real Time 4WD system combines a dual-pump system with a one-way cam unit to enhance sensing of front-wheel slippage all in a lightweight, compact design. The system transfers power - 20% more torque compared to the previous unit, thanks to optimised materials and construction - to the rear wheels promptly, and significantly improves stability during startup and cornering on snow-covered roads and other slippery road surfaces.

The CR-Vs Real Time 4WD system sends power only to the rear wheels when there is insufficient traction for the front-wheel-drive system. The system consists of the conventional front-wheel-drive system, a compact transfer case that distributes torque to a propeller shaft running the length of the vehicle, a dual-pump system with a multi-plate clutch, a cam unit mechanism, the rear differential, and left and right rear-wheel driveshafts.

The core of the system is the dual-pump unit. It consists of two hydraulic pumps, one driven by the front wheels via the propeller shaft and one driven by the rear wheels via the rear differential. A hydraulically actuated, multi-plate clutch, similar to the clutches used in Honda automatic transmissions, connects the propeller shaft to the rear differential.

New Honda CR-V crossover SUV: The 5-speed automatic transmission is equipped with a Grade Logic Control system.

The auto transmission is equipped with a Grade Logic Control system.

When the CR-V is operating with the front and rear wheels turning at the same speed, for example on dry pavement, the front and rear hydraulic pumps operate at the same rate. Hydraulic fluid circulates between the two pumps; however, no pressure is generated: the fluid pressure created by the front pump is equalized by the rear pump.

If the front wheels begin to turn faster than the rear wheels, as would be the case if they were spinning on snow or ice, the two hydraulic pumps would turn at a different rate and hydraulic pressure proportional to the difference in their speeds of rotation would be generated. The resulting hydraulic pressure opens a valve body and feeds pressure to the multi-plate clutch, which engages the front propeller shaft to the rear differential. The rear differential then feeds the drive torque to the right and left rear wheels.

To provide a quick torque transfer response time for "transparent" 4-wheel drive operation to the driver, the multi-plate clutch is supplemented by a one-way ball cam unit mechanism. The cam unit mechanism consists of two plates separated by six ball cams (large bearings) that move within ramped grooves. When a slight difference in rotation speed exists between the rear and front wheels when driving forward, the ball cams move within the ramped grooves and create pressure that instantly begins the engagement of the main clutch (prior to the build-up of sufficient hydraulic pressure). By engaging the main clutch at a sufficient force even before the hydraulic pressure is generated by the two hydraulic pumps, the driving torque is transferred without a hint of time lag.

Overall system operation is completely automatic; no electronics or driver action is involved. The greater the degree of front-wheel slippage, the greater the amount of torque fed to the rear wheels. Real Time 4WD is also low maintenance. The Maintenance Minder system will indicate that the dual pump fluid should be changed at about 60,000 miles (96,500 km).

To read more about the all-new, third generation Honda CR-V crossover SUV: General presentation, U.S. trim and equipment, engine, transmission and drive options in Europe and the U.S., steering, suspension and brakes, and the three CR-V generations since 1995

 

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