BUCKING DAMPER OPERATION[MZ-CD 1.6 (Y6)]
id0140b2179000
• There is a so‐called software filter between the accelerator pedal calculation and the calculation unit.
• When the accelerator is actuated or released suddenly, this causes huge changes in injected fuel quantity requirements and thereby also in the torque produced.
• This abrupt load change causes excitation in the engine/transmission assembly’s flexible mountings which then results in unpleasant bucking oscillations (engine speed fluctuations). These are reduced by the bucking damper as follows:
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― As engine speed increases, comparatively less fuel is injected, as engine speed decreases more fuel is injected.
• In addition, the software filter prevents an abrupt drop in engine speed when changing gear.
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1
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Engine speed
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2
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Abrupt actuation of accelerator (driver’s intention)
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3
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Engine speed curve without active bucking damping
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4
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Engine speed curve with active bucking damping
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5
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Time
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