System and method for engine starting adaptation
Methods and systems for adapting engine starting thresholds for automatic engine starting are described. In one example, one or more automatic engine starting thresholds may be adjusted to decrease a possibility of automatic engine starting. The automatic engine starting thresholds may be adjusted based on engine starts being characterized as low benefit engine starts.
1 . A method for operating a vehicle, comprising:
adjusting one or more automatic engine starting thresholds in response to a plurality of low benefit engine starts, wherein low benefit engine starts are where an engine of the vehicle remains started for less than a threshold amount of time resulting in inefficient engine output.
2 . The method of claim 1 , wherein the one or more automatic engine starting thresholds includes a threshold amount of time that driver demand exceeds a threshold driver demand before the engine is automatically started.
3 . The method of claim 2 , wherein the threshold driver demand is included in the one or more automatic engine starting thresholds.
4 . The method of claim 1 , further comprising adjusting driver demand as a function of driver demand pedal position in response to the plurality of low benefit engine starts.
5 . The method of claim 1 , further comprising a time constant of a filter applied to driver demand torque or power in response to the plurality of low benefit engine starts.
6 . The method of claim 1 , where the plurality of low benefit engine starts include starting an engine and stopping the engine before the engine has performed a threshold amount of work propelling the vehicle or charging a traction battery of the vehicle.
7 . The method of claim 1 , where the plurality of low benefit engine starts include and amount of time after an engine start that an engine was running at greater than a threshold driver demand torque or power being less than a threshold for a calibrated amount of time.
8 . A vehicle system, comprising:
an electric machine;
an internal combustion engine; and
a controller including executable instructions that cause the controller to adjust one or more automatic engine starting thresholds to reduce a frequency of automatic engine starts in response to a behavior classification of a human vehicle driver that has been characterized as being aggressive, wherein the human vehicle driver is characterized as being aggressive when a frequency of a rate of position change of a pedal of the vehicle is greater than a threshold rate.
9 . The vehicle system of claim 8 , where the behavior classification is additionally based on a rate of speed change of the pedal.
10 . The vehicle system of claim 8 , where the behavior classification is additionally based on a frequency of change of driver demand being greater than a threshold.
11 . The vehicle system of claim 8 , where the behavior classification is additionally based on pedal movement.
12 . The vehicle system of claim 8 , where one of the one or more automatic engine starting thresholds is an estimated amount of work performed via the internal combustion engine.
13 . The vehicle system of claim 8 , further comprising additional executable instructions to start the internal combustion engine in response to the one or more automatic engine starting thresholds being exceeded.
14 . The vehicle system of claim 8 , further comprising additional executable instructions to adjust the one or more automatic engine starting thresholds in response to a plurality of low benefit engine starts.
15 . A method for operating a vehicle, comprising:
adjusting one or more automatic engine starting thresholds in response to a plurality of low benefit engine starts and a behavior classification of a human vehicle driver that has been characterized wherein an engine of the vehicle remains started for less than a threshold amount of time and wherein adjusting one or more automatic engine starting thresholds includes raising an automatic engine starting threshold such that automatic engine starting frequency is lowered.
16 . The method of claim 15 , further comprising not including engine starts that are not based on driver demand in the plurality of low benefit engine starts.
17 . The method of claim 15 , where the adjusting is based on probability of performing a low benefit engine start as determined from prior engine starts.
18 . The method of claim 15 , where the plurality of low benefit engine starts are based on the human vehicle driver and not on a second human vehicle driver.