Ride height control system and method
The present invention relates to a control system ( 49 ) for controlling a target ride height of a vehicle ( 1 ). The control system ( 49 ) is configured to set a target off-road ride height (h OFF ) in dependence on one or more vehicle operating parameters. The target off-road ride height (h OFF ) is set upon receipt of a driving mode signal signalling that an off-road driving mode has been selected. Aspects of the present invention also relate to a vehicle and a method of controlling a target ride height of a vehicle.
1 . A control system for controlling a target ride height of a vehicle, the control system comprising an electronic control unit (ECU) configured to receive a driving mode signal signaling that an off-road driving mode has been selected,
wherein when in said selected off-road driving mode, the control system is configured to select a first target off-road ride height when the vehicle speed is below a first speed threshold and to select a second target off-road ride height when the vehicle speed is above said first speed threshold, wherein said first target off-road ride height is higher than said second target off-road ride height, and
wherein the control system is configured to select a target ride height lower than the second target off-road ride height when the vehicle speed increases above a second speed threshold.
2 . A control system as claimed in claim 1 , configured automatically to select the first of said target off-road ride heights when the vehicle speed decreases below said first speed threshold for a defined first time period.
3 . A control system as claimed in claim 2 , wherein the first time period is dependent on a transfer case operating range.
4 . A control system as claimed in claim 1 , configured automatically to select the first or second target off-road ride height once the vehicle speed has decreased below said second speed threshold for a defined second time period.
5 . A control system as claimed in claim 1 , configured to output a signal to dis-engage the off-road driving mode when the vehicle speed remains above said second speed threshold for a defined third time period.
6 . A control system as claimed in claim 1 , configured to enable manual selection of said first off-road ride height when the second off-road ride height is selected and the vehicle speed is less than a predefined threshold.
7 . A control system as claimed in claim 1 , configured to set the target off-road ride heights in dependence on a detected terrain parameter.
8 . A control system as claimed in claim 1 , wherein the control system comprises a driving mode selector configured to output the driving mode signal, the driving mode selector being operable manually by a driver or automatically in relation to automatically detected terrain parameters to signal that an on-road or an off-road driving mode has been selected.
9 . A vehicle comprising a control system as claimed in claim 1 .
10 . A method of controlling a target ride height of a vehicle, the method comprising receiving a driving mode signal signaling that an off-road driving mode has been selected, wherein when in said selected off-road driving mode, the method comprises:
selecting a first target off-road ride height when the vehicle speed is below a first speed threshold; and
selecting a second target off-road ride height when the vehicle speed is above said first speed threshold, wherein said first target off-road ride height is higher than said second target off-road ride height, and
wherein the method comprises selecting a target ride height lower than the second target off-road ride height when the vehicle speed increases above a second speed threshold.
11 . A method as claimed in claim 10 , comprising automatically selecting the first of said target off-road ride heights when the vehicle speed decreases below said first speed threshold for a defined first time period.
12 . A method as claimed in claim 11 , wherein the first time period is dependent on a transfer case operating range.
13 . A method as claimed in claim 10 , comprising automatically selecting the first or second target off-road ride height once the vehicle speed has decreased below said second speed threshold for a defined second time period.
14 . A method as claimed in claim 10 , comprising outputting a signal to dis-engage the off-road driving mode when the vehicle speed remains above said second speed threshold for a defined third time period.
15 . A method as claimed in claim 10 , comprising enabling manual selection of said first off-road ride height when the second off-road ride height is selected and the vehicle speed is less than a predefined threshold.
16 . A method as claimed in claim 10 , comprising setting the target off-road ride heights in dependence on a detected terrain parameter.
17 . A non-transitory, computer-readable storage medium storing instructions thereon that, when executed by one or more electronic processors, causes the one or more electronic processors to carry out the method of claim 10 .