Hill start assist system
AssigneeVolvo Group North America, LLC
InventorAbram McConnell Bradley, IV
Life of this patent
Estimating the term…
Abstract
A hill start assist system for a tractor includes a pressure reduction valve receiving air from an air supply source, a solenoid valve having a supply port connected to a delivery port of the pressure reduction valve, a double check valve receiving air from a foot brake valve and from the solenoid valve, a tractor protection valve receiving air from the solenoid valve and from front and rear brake circuits of the tractor and an inversion valve having a control line connected to the solenoid, a supply port connected to the delivery line of the tractor protection valve, an exhaust port connected to the foot brake valve and a delivery line connected to a stop light switch.
Claims20
A hill start assist system for a tractor comprising:
- a pressure reduction valve receiving air from an air supply source;
- a solenoid valve having a supply port connected to a delivery port of the pressure reduction valve;
- a double check valve receiving air from a foot brake valve and from the solenoid valve;
- a tractor protection valve receiving air from the solenoid valve and from front and rear brake circuits of the tractor;
- and
- an inversion valve having a control line connected to the solenoid, a supply port connected to the delivery line of the tractor protection valve, an exhaust port connected to the foot brake valve and a delivery line connected to a stop light switch.
A method of activating a hill start assist function in a vehicle comprising:
- a transmission electronic control unit (T-ECU) instructing an anti lock braking system electronic control unit (ABS ECU) to activate the hill start assist function;
- the ABS ECU transmitting an electrical signal to a solenoid valve;
- the solenoid valve delivering air from a pressure reduction valve to each of a double check valve, a supply line of a tractor protection valve and a control line of an inversion valve;
- the double check valve delivering air to rear axle module to activate rear brakes of the trailer;
- the tractor protection valve providing air to a supply line of the inversion valve and to glad hands associated with a trailer attached to the tractor;
- and
- the inversion valve selectively delivering air to a stop light switch based on status of a foot pedal.
Dependencies are inferred from the claim text.