Driving the Energi as a hybrid

[stevedebi]

I was thinking that the car would have something built into it (software or whatever) because someone could have a full battery at the top of a hill...just didnt make sense that the car would do that...I should be able to have a full battery and put it in L  and even use the brakes without the car shutting down...

Concur. Sorry if I missed it, but are you still under warranty? Even if not, the eCVT and engine are covered by the hybrid warranty. I would hope the dealer would at least read any codes for free.

[troylikesbikes]

Concur. Sorry if I missed it, but are you still under warranty? Even if not, the eCVT and engine are covered by the hybrid warranty. I would hope the dealer would at least read any codes for free.

 

The car has 15K on it, still under warranty sure. I can have them check the codes when it goes in for an oil change when I get it back to home.

[FordService]

I was under the impression that active noise cancellation was for the ICE.   Does active noise cancellation do anything about road noise?  Is the model S a noisier car at all speeds?  Is it noisier because of road noise or motor noise?

 

Here's some details on how Active Noise Cancellation works.

 

What It Is

• A feature that:

– Helps reduce low frequency noise while enhancing desirable sounds

– Creates a tailored sound experience by helping to refine engine sound

 

How It Works

• Microphones in the vehicle interior headliner detect and measure the amplitude and phase of noise sound waves

• This information is relayed to the active noise control module

• The module takes into account engine speed to calculate the target frequency that needs to be reduced, targeting only unwanted noise and not other noise inside the cabin such as the audio system or passenger conversations

• The module then uses this information to generate a sound wave that has the same amplitude as the noise but reverses and enhances it

• The reversed and enhanced sound wave is directed through speakers at the vehicle floor

 

Key Benefits

• Reduced unwanted interior noise

• Enhanced desirable engine sound

 

Meagan

[kzoojason76]

 

Key Benefits

• Reduced unwanted interior noise

 

 

 

 

Doesn't always work that well.  I can still hear my wife nagging at me from time to time :)

[Hybridbear]

I was under the impression that active noise cancellation was for the ICE.   Does active noise cancellation do anything about road noise?  Is the model S a noisier car at all speeds?  Is it noisier because of road noise or motor noise?

From the workshop manual:

 

Active Noise Control

The active noise control is an audio system feature that minimizes or cancels certain low frequency engine noises within the passenger compartment. The active noise control system is integral to the audio system utilizing 3 microphones and the DACMC.

The DACMC is a digital signal processor that consists of an internal analog/digital converter and tone generator.

While the engine is running, the microphones, located in the headliner (two in the front and one in the rear), monitor the engine noise resonating in the passenger compartment. The analog signals from the microphones are processed through the analog/digital converter integral to the DACMC. The DACMC receives the vehicles engine speed from the PCM and determines the frequency to be canceled from the engine speed data and microphones input signals. The DACMC produces an opposing output frequency signal from the internal tone generator. The DACMC send the opposing output frequency signal to the audio DSP module. The audio DSP module mixes the opposing output frequency signal from the DACMC and audio signals that are from the ACM. The amplified mixed audio signal are sent to the vehicle speakers eliminating some of the low frequency engine noise.

This indicates that ANC only works when the ICE is on, but murphy's account would imply that it works whenever the car is on. This section of the workshop manual may just be copied & pasted from the gas Fusion where the ICE is always on, but a more accurate description would be that ANC is active whenever the car is on. However, it does reference monitoring ICE RPM from the PCM as part of the process...so I'm not sure.

Edited September 16, 2015 at 12:50 PM by Hybridbear

[FordService]

Doesn't always work that well.  I can still hear my wife nagging at me from time to time :)

 

Oh, you know that just means she cares. ;)

 

Meagan

[stevedebi]

From the workshop manual:

This indicates that ANC only works when the ICE is on, but murphy's account would imply that it works whenever the car is on. This section of the workshop manual may just be copied & pasted from the gas Fusion where the ICE is always on, but a more accurate description would be that ANC is active whenever the car is on. However, it does reference monitoring ICE RPM from the PCM as part of the process...so I'm not sure.

From what I've read, Ford managed to make the engine lighter by omitting some of the features that kept the engine quieter. Hence the ANC to cancel out the engine noise, and I'm not sure it works when the ICE is off.

[openair]

As hybridbear and Meagan says the ANC monitors ICE speed/RPM, and as stevedebi says the ice is lighter because some features of engines for vehicles without ANC were omitted.  The ICE and how it interacts with the eCVT and the nature of a hybrid are the entire reason these vehicles have ANC.  Most ICE's are calibrated such that they rarely, if ever, run at certain RPM and/or gear combinations so that they do not create high or low frequency sounds that are often very annoying. 

 

The eCVT has many more power/efficiency points than a standard transmission and any extra power generated at one of these points not needed to propel the vehicle can simply be channeled into the hvb.  The efficiency of these extra points made ANC a must for these vehicles.  The reduce weight by omitting some sound dampening from the ICE was icing on the cake.

 

Murphy's experience with road and other ambient noises is likely due to extra sound dampening material within the body of the vehicle and/or manufacturer experience.  Ford likely has more experience and knowledge with placing and types of sound dampening than Tesla who has not been building vehicles as long. 

[larryh]

From Ford's press release on Active Noise Cancellation:

 

At the lower speeds that help efficiency, engines produce booming, low-frequency sounds that can be unpleasant to the driver and passengers. Without Active Noise Cancellation, engineers have to keep the engine out of this operating range, sacrificing efficiency.

 

Active Noise Cancellation allows the ICE to operate more efficiently in regions that would otherwise make the car unpleasant to drive.