CONTROL SYSTEM AND METHOD
First Claim
1. A system comprising:
- a first controller configured in each of a predetermined plurality of states to generate a torque request signal in order to cause a vehicle to operate in accordance with a target speed value,the system being configured, when the first controller is one of said plurality of states to generate a gear shift limit signal to cause a change in an engine speed at which a transmission controller is permitted to cause a gear downshift, the gear shift limit signal being generated in dependence on at least one traction indicator signal indicative of an amount of estimated traction between the vehicle and a driving surface, wherein the gear shift limit signal is further configured to suspend a gear downshift if the estimated traction between the vehicle and a driving surface is below a first threshold.
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Accused Products
Abstract
Embodiments of the present invention provide a system comprising: a first controller configured in each of a predetermined plurality of states to generate a torque request signal in order to cause a vehicle to operate in accordance with a target speed value, the system being configured, when the first controller is one of said plurality of states to generate a gear shift limit signal to cause a change in an engine speed at which a transmission controller is permitted to cause a gear downshift, the gear shift limit signal being generated in dependence on at least one traction indicator signal indicative of an amount of estimated traction between the vehicle and a driving surface.
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Citations
24 Claims
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1. A system comprising:
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a first controller configured in each of a predetermined plurality of states to generate a torque request signal in order to cause a vehicle to operate in accordance with a target speed value, the system being configured, when the first controller is one of said plurality of states to generate a gear shift limit signal to cause a change in an engine speed at which a transmission controller is permitted to cause a gear downshift, the gear shift limit signal being generated in dependence on at least one traction indicator signal indicative of an amount of estimated traction between the vehicle and a driving surface, wherein the gear shift limit signal is further configured to suspend a gear downshift if the estimated traction between the vehicle and a driving surface is below a first threshold. - View Dependent Claims (3, 4, 5, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 23)
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2. (canceled)
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7-8. -8. (cancelled)
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19. A method of operating a vehicle implemented by means of a control system, the method comprising:
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causing a powertrain to deliver drive torque and cause a vehicle to operate in accordance with a target speed value; generating a gear shift signal to cause a change in a speed at which a transmission is permitted to downshift or substantially prevent a transmission from downshifting, and generating the gear shift signal in dependence on at least one traction indicator signal being a signal indicative of an amount of tractive force that may be developed between a driving surface and one or more driving wheels, wherein the gear shift limit signal is further configured to suspend a gear downshift if the estimated traction between the vehicle and a driving surface is below a first threshold. - View Dependent Claims (20, 21, 22)
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24. (canceled)
Specification