US 6,640,179 B2Granted

Vehicle drive force control

AssigneeNissan Motor Co., Ltd.

InventorsShusaku Katakura, Daisuke Yoshinoya

Life of this patent

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Abstract

An automatic transmission (5) converts the output torque of an engine (4) into a drive torque for the vehicle. The automatic transmission (5) is provided with a first gear and a second gear which has a smaller speed reduction ratio than the first gear. The gears are selectively applied according to the vehicle speed and the accelerator pedal depression amount. A controller (3) stores a first map (11, 12) which prescribes the transmission target output torque with the first gear according to the vehicle speed and the depression amount, and a second map (12, 13) which prescribes the transmission target output torque with the second gear according to the vehicle speed and the depression amount. The first map applies a larger transmission target output torque than the second map at a given vehicle speed and depression amount. The transmission target output torque is calculated by looking up either of these maps corresponding to the gear applied by the automatic transmission (5). Thus saturation of the transmission target output torque can be prevented by controlling the output torque of the engine (4) based on the transmission target output torque thus obtained.

Claims9

Dependent claims

A vehicle drive system, comprising:

an accelerator pedal;
a sensor which detects a vehicle speed;
a sensor which detects a depression amount of the accelerator pedal;
an engine varying an output torque in response to a signal;
an automatic transmission converting the output torque of the engine into a drive torque of a vehicle, the transmission being provided with a first gear and a second gear which has a smaller speed reduction ratio than the first gear, the first gear and second gear being selectively applied according to the depression amount and the vehicle speed;
a sensor which detects the gear applied by the automatic transmission;
and
a programmable controller programmed to:
store a first map prescribing a transmission target output torque with the first gear according to the depression amount and the vehicle speed, and a second map prescribing the transmission target output torque with the second gear according to the depression amount and the vehicle speed, the transmission target output torque prescribed by the first map being larger than the transmission target output torque prescribed by the second map with respect to the same vehicle speed and the same depression amount;
calculate the transmission target output torque based on the vehicle speed and the depression amount by looking up either of the first map and second map corresponding to the gear which is applied by the automatic transmission;
calculate an engine target output torque based on the transmission target output torque;
and
output the signal corresponding to the engine target output torque to the engine.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/984,703Filed 31 Oct 2001
Priority: JP 2000-36313129 Nov 2000
Published: US 2002/0065597 A130 May 2002
Granted: 28 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F16H 61/0213
For gearshift control, e.g. control functions for performing shifting or generation of shift signal: characterised by the method for generating…
B60W 2510/105
Change speed gearings: output torque
F16H 59/18
Inputs being a function of torque or torque demand: dependent on the position of the accelerator pedal
F16H 59/44
Inputs being a function of speed: dependent on machine speed , e.g. the vehicle speed