Gmax RrT 4RriTe Wg IwrI12

where motion resistance R = R + R and I and I are engine and wheel inertias. Engine speed relates to vehicle speed as

1 e s e s and tyre slip efficiency E can be assumed equal to 0.965 for this calculation.

Thus Ne and Te for each gear reduction may be tabulated against road speed by means of the engine torque/speed curve. Motion resistance forces are subtracted from P to give free tractive

ROLL

SINGLE WHEEL BUMP

PITCH

BOUNCE

ROLL

FRONT

SINGLE WHEEL BUMP

PITCH

BOUNCE

REAR FRONT

REAR FRONT

FRONT

REAR FRONT

REAR FRONT

REAR FRONT

REAR

LARGE SMALL-i AREA AREA

LARGE SMALL-i AREA AREA

Levelling Sensor-

Levelling Sensor

Levelling Sensor-

Levelling Sensor

Fig. 8.17 Hydragas suspension: (a) interconnection system; (b) automatic levelling system; (c) small car subsystem; (d) operating characteristics.

REAR

force Pf then transferable tractive force is calculated. To obtain acceleration, a = TfG/YW is used and values can be plotted in a curve such as at (c), a time/speed curve which yields times for accelerating up to (and between) given speeds.

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