Electrified fire fighting vehicle
An electrified fire fighting vehicle includes a chassis, a cab coupled to the chassis, a body coupled to the chassis rearward of the cab, an axle coupled to the chassis, a battery pack having a maximum capacity, a driveline coupled to the axle, and a controller. The driveline includes an electric motor coupled to the battery pack. The controller is configured to prevent charging the battery pack beyond a charge threshold to maintain an amount of storage capacity between the charge threshold and the maximum capacity to accommodate energy generated during one or more regenerative braking events and permit charging the battery pack beyond the charge threshold up to an overcharge threshold in response to receiving an override command or a certain mode selection. The overcharge threshold is greater than the charge threshold but less than the maximum capacity.
1 . An electrified fire fighting vehicle comprising:
a chassis;
a cab coupled to the chassis;
a body coupled to the chassis rearward of the cab;
an axle coupled to the chassis;
a battery pack having a maximum capacity;
a driveline coupled to the axle, the driveline including an engine and an electric motor coupled to the battery pack;
a pump system; and
a controller configured to:
operate driveline in an electric mode with the engine off where the electric motor drives the axle to provide a first performance condition;
monitor a state of charge of the battery pack;
provide an indication to an operator of the electrified fire fighting vehicle that the state of charge is at a first, higher threshold;
in response to the indication, (a) receive a first input from the operator to maintain the first performance condition or (b) receive a second input from the operator to continue operation in the electric mode;
start the engine in response to the first input to maintain the first performance condition and the state of charge;
de-rate operation of the electric motor in response to the second input to provide a second performance condition;
start the engine in response to the state of charge being at a second, lower threshold;
prevent charging the battery pack using a mains power source beyond a charge threshold to maintain an amount of storage capacity between the charge threshold and the maximum capacity;
permit charging the battery pack beyond the charge threshold using energy generated during one or more regenerative braking events; and
permit charging the battery pack beyond the charge threshold up to an overcharge threshold in response to receiving a certain mode selection corresponding with a pump charge mode;
wherein the second performance condition is lower than the first performance condition;
wherein the second performance condition is at least a minimum performance condition for at least one of acceleration or top speed;
wherein the overcharge threshold is greater than the charge threshold but less than the maximum capacity; and
wherein the overcharge threshold is sufficient for the battery pack to supply energy to perform a pump test on the pump system.
2 . The electrified fire fighting vehicle of claim 1 , wherein the second performance condition is at least the minimum performance condition for acceleration and top speed.
3 . The electrified fire fighting vehicle of claim 1 , wherein the second performance condition is greater than the minimum performance condition for acceleration.
4 . The electrified fire fighting vehicle of claim 1 , wherein the second performance condition is greater than the minimum performance condition for top speed.
5 . The electrified fire fighting vehicle of claim 1 , wherein the second performance condition is greater than the minimum performance condition for acceleration and top speed.
6 . The electrified fire fighting vehicle of claim 1 , wherein the controller is configured to prevent operating at the second performance condition if the electrified fire fighting vehicle is actively responding to a scene.
7 . The electrified fire fighting vehicle of claim 6 , wherein the controller is configured to refrain from providing the indication if the electrified fire fighting vehicle is actively responding to the scene.
8 . An electrified fire fighting vehicle comprising:
a chassis;
a cab coupled to the chassis;
a body coupled to the chassis rearward of the cab;
an axle coupled to the chassis;
a battery pack having a maximum capacity;
a driveline coupled to the axle, the driveline including an electric motor coupled to the battery pack;
a pump system; and
a controller configured to:
prevent charging the battery pack using a mains power source beyond a charge threshold to maintain an amount of storage capacity between the charge threshold and the maximum capacity;
permit charging the battery pack beyond the charge threshold using energy generated during one or more regenerative braking events; and
permit charging the battery pack beyond the charge threshold up to an overcharge threshold in response to receiving a certain mode selection corresponding with a pump charge mode;
wherein the overcharge threshold is greater than the charge threshold but less than the maximum capacity; and
wherein the overcharge threshold is sufficient for the battery pack to supply energy to perform a pump test on the pump system.
9 . The electrified fire fighting vehicle of claim 8 , wherein the driveline includes an engine, and wherein the controller is configured to:
operate driveline in an electric mode with the engine off where the electric motor drives the axle to provide a first performance condition;
monitor a state of charge of the battery pack;
provide an indication that the state of charge is at a discharge threshold;
in response to the indication, (a) receive a first input to maintain the first performance condition or (b) receive a second input to continue operation in the electric mode;
start the engine in response to the first input to maintain the first performance condition and the state of charge; and
de-rate operation of the electric motor in response to the second input to provide a second performance condition, wherein the second performance condition is lower than the first performance condition.
10 . The electrified fire fighting vehicle of claim 9 , wherein the second performance condition is at least a minimum performance condition for at least one of acceleration or top speed.
11 . The electrified fire fighting vehicle of claim 10 , wherein the second performance condition is at least the minimum performance condition for acceleration and top speed.
12 . The electrified fire fighting vehicle of claim 11 , wherein the second performance condition is greater than the minimum performance condition for at least one of acceleration or top speed.
13 . The electrified fire fighting vehicle of claim 12 , wherein the second performance condition is greater than the minimum performance condition for acceleration and top speed.
14 . The electrified fire fighting vehicle of claim 9 , wherein the discharge threshold is a first, higher discharge threshold, and wherein the controller is configured to start the engine in response to the state of charge being at a second, lower discharge threshold.
15 . The electrified fire fighting vehicle of claim 9 , wherein the controller is configured to at least one of:
prevent operating at the second performance condition if the electrified fire fighting vehicle is actively responding to a scene; or
refrain from providing the indication if the electrified fire fighting vehicle is actively responding to the scene.
16 . The electrified fire fighting vehicle of claim 8 , wherein the controller is configured to permit charging the battery pack beyond the charge threshold up to the overcharge threshold in response to determining that the electrified fire fighting vehicle is operating in a flat-terrain condition in which less storage capacity is to be dedicated to accepting energy from the one or more regenerative braking events, and wherein the controller determines the flat-terrain condition based on at least one of:
a location of the electrified fire fighting vehicle obtained from a global positioning system; or
receiving the certain mode selection corresponding with a flat-terrain mode.
17 . An electrified fire fighting vehicle comprising:
an axle;
a battery pack having a maximum capacity;
a driveline coupled to the axle, the driveline including an engine and an electric motor coupled to the battery pack;
a pump system; and
a controller configured to:
prevent charging the battery pack beyond a charge threshold to maintain an amount of storage capacity between the charge threshold and the maximum capacity to accommodate energy generated during one or more regenerative braking events; and
permit charging the battery pack beyond the charge threshold up to an overcharge threshold in response to receiving a certain mode selection corresponding with a pump charge mode, wherein the overcharge threshold is greater than the charge threshold but less than the maximum capacity, and wherein the overcharge threshold is sufficient for the battery pack to supply energy to perform a pump test on the pump system.