Control system and method
First Claim
Patent Images
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 predetermined plurality of states operating in accordance with the target speed value, 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 signal is further configured to suspend a gear downshift when the estimated traction between the vehicle and the driving surface is below a first threshold.
1 Assignment
0 Petitions
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.
-
Citations
20 Claims
-
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 predetermined plurality of states operating in accordance with the target speed value, 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 signal is further configured to suspend a gear downshift when the estimated traction between the vehicle and the driving surface is below a first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of operating a vehicle implemented by means of a control system, the method comprising:
-
causing a powertrain to deliver drive torque and cause a vehicle to operate in accordance with a target speed value; while operating in accordance with the 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 he 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 when the estimated traction between the vehicle and the driving surface is below a first threshold. - View Dependent Claims (17, 18, 19, 20)
-
Specification