System and method for trailer propulsion
The vehicle system can include: a set of vehicle couplings (e.g., a tractor interface, a trailer interface, etc.); a chassis, a battery pack, an electric powertrain, a sensor suite, and a controller. The modular vehicle system can optionally include landing gear, a suspension, and any other suitable set of components. The vehicle system functions to structurally support and/or tow a trailer—such as a Class 8 semi-trailer—and/or to augment/supplement a tractor propulsive capability (e.g., via a diesel/combustion engine) with a supplementary electric drive axle(s).
1. A roadway electric vehicle (EV) system configured to connect between a semi-tractor and a trailer, the roadway EV system comprising:
a chassis defining a longitudinal axis;
a kingpin configured to couple the chassis to a fifth wheel of the semi-tractor;
a sensor platform connecting the kingpin to the chassis, the sensor platform comprising a first sensor configured to measure a longitudinal force between the kingpin and the chassis;
a secondary fifth wheel mounted to the chassis and configured to couple the trailer to the chassis;
an electric drivetrain comprising: a traction motor and a steering drive axle;
a battery system comprising a set of battery cells and a charge port, wherein the set of battery cells is arranged above the kingpin and extends longitudinally forward of the kingpin relative to the longitudinal axis; and
a set of extendable landing gear mounted to the chassis forward of the steering drive axle and comprising a set of front wheels.
2. The roadway EV system of claim 1 , wherein the chassis is monocline-shaped between the forward end and a rearward end.
3. The roadway EV system of claim 1 , wherein, in a deployed configuration of the extendable landing gear, the roadway EV system is rear-wheel drive and rear-wheel steering.
4. The roadway EV system of claim 1 , wherein the secondary fifth wheel mounted to the chassis at a first position which is longitudinally forward of the steering drive axle relative to the longitudinal axis.
5. A road vehicle system comprising:
a chassis defining a longitudinal axis;
a first vehicle coupling mounted at a forward end of the chassis relative to the longitudinal axis;
a second vehicle coupling mounted to a superior surface of the chassis rearwardly of the forward end relative to the longitudinal axis;
an electric powertrain, comprising:
a battery mounted to the forward end of the chassis;
a steering axle comprising a steering actuator; and
a traction motor coupled to the steering axle; and
a vehicle sensor suite comprising a first sensor coupled to the first vehicle coupling and configured to measure a longitudinal force between the first vehicle coupling and the chassis.
6. The road vehicle system of claim 5 , further comprising: a controller communicatively coupled to the first sensor and configured to autonomously control the electric powertrain based on measurements from the first sensor.
7. The road vehicle system of claim 5 , wherein the road vehicle system comprises a set of axles, the set of axles comprising the steering axle, wherein each axle of the set defines a respective axle load, wherein the sum of the respective axle loads defines a total weight bearing of the road vehicle system, wherein the respective axle load of the steering axle is greater than 70% of the total weight bearing of the road vehicle system in a driving configuration.
8. The road vehicle system of claim 7 , wherein the steering axle comprises a high-load axle, wherein, in the driving configuration, the respective axle load of the steering axle is greater than 17,000 pounds.
9. The road vehicle system of claim 7 , further comprising a lift axle mounted to the chassis forward of the steering axle relative to the longitudinal axis, wherein the lift axle is unloaded in the driving configuration, wherein the respective axle load of the steering axle is greater than 70% of the total weight bearing of the road vehicle system in a second configuration.
10. The road vehicle system of claim 5 , wherein the traction motor is integrated into the steering axle.
11. The road vehicle system of claim 10 , wherein the first vehicle coupling comprises a kingpin.
12. The road vehicle system of claim 11 , wherein the second vehicle coupling comprises a fifth wheel.
13. The road vehicle system of claim 5 , wherein the road vehicle system further comprises a pneumatic brake line passthrough configured to fluidly couple a tractor brake line to a trailer brake line at opposing ends, wherein the sensor suite comprises a brake line sensor coupled to the pneumatic brake line passthrough.
14. The road vehicle system of claim 5 , wherein the chassis is monocline-shaped between the forward end and a rearward end.
15. The road vehicle system of claim 5 , wherein the first vehicle coupling defines an inferior contact surface and a horizontal reference plane six inches above the inferior contact surface, wherein the second vehicle coupling is mounted below the horizontal reference plane.
16. The road vehicle system of claim 5 , further comprising a charge port configured to supply electrical energy to the battery.
17. The road vehicle system of claim 5 , wherein the road vehicle system further comprises a sensor instrumentation stage substantially isolating force transmission through the first sensor along the longitudinal axis.
18. The road vehicle system of claim 17 , wherein the sensor instrumentation stage isolates force transmission along the longitudinal axis with a set of orthogonal rollers or a flexure.
19. The road vehicle system of claim 5 , wherein the first sensor comprises a load cell or a strain gauge.
20. The road vehicle system of claim 5 , wherein the battery defines a maximum battery height, wherein the maximum battery height is between 6 feet and 13.5 feet.