Ashwin Lewis
Torque Sleep is a feature in some Tesla car models that allows the car to save power by putting one of its two motors to sleep when it is not needed. This feature is particularly useful for dual-motor vehicles, as it allows the car to maintain control while only one motor is running. While the concept of Torque Sleep was introduced by Tesla, it is not clear how the feature works in practice, and there have been some issues reported with its implementation.
| Characteristics | Values |
|---|---|
| What is torque sleep? | A concept introduced by Tesla where a dual motor vehicle puts one motor to sleep to save power. |
| How does it work? | The motor is put to sleep when torque is not needed and is instantly woken up when the accelerator is pressed. |
| How long does it take to wake up the motor? | 1-2 milliseconds |
| When is it used? | When the torque needed to keep the car going is substantially less than the available torque. |
| What type of cars is it used in? | Dual motor vehicles, rear-wheel drive cars, and all-wheel-drive cars. |
| What is its impact on energy efficiency? | There are reports of improved energy efficiency, but also of no noticeable difference. |
| Does it affect battery temperatures? | There are conflicting reports on this. |
| Can it be controlled by the driver? | Yes, it can be controlled using the "range mode" setting. |
| Does it affect climate control? | Yes, it can limit heating and cooling. |
| Does it affect traction on slippery surfaces? | It is unclear if it affects traction, but it is recommended to disable torque sleep on snowy days. |
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What You'll Learn
Torque sleep saves power by putting one motor to sleep
Torque sleep is a concept developed by Tesla for its dual-motor vehicles, which involves putting one motor to sleep to save power when it is not needed. This is comparable to how a modern computer can sleep in between keystrokes. The motor quickly wakes up when the accelerator is pressed, and the driver does not perceive the wake-up time. This feature is particularly useful for dual-motor vehicles as there are many instances when the car is more efficient with only one motor running.
The torque sleep feature is available as a range mode setting in some Tesla models, which limits the power of the climate control system, resulting in reduced energy consumption for warming or cooling the cabin. However, it is recommended to disable torque sleep on slippery surfaces, such as icy or wet roads, to maintain traction and prevent the vehicle from slipping or spinning.
While torque sleep can provide energy savings, its effectiveness may vary depending on driving habits, tires, and other variables. For example, one user reported higher energy usage after updating to the v7.0 software, despite the torque sleep feature. On the other hand, another user with the same software version noticed a significant improvement in energy efficiency on a regular route that involved altitude changes.
There have been some concerns about torque sleep potentially causing reduced power or safety failures. Some Tesla owners reported issues with frequent loss of power and pull-over events, particularly with the P85D model in range mode. It was speculated that Tesla may have rushed the release of torque sleep without thorough testing, leading to possible software or hardware design flaws. However, others suggested that the issues might be firmware-related or due to bad programming.
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The motor wakes up in 1-2 milliseconds when the accelerator is pressed
Torque Sleep is a concept introduced by Tesla for its dual-motor vehicles. It involves putting one motor to sleep to save power when torque is not needed, such as when the car is decelerating or at a standstill. This feature is particularly useful for improving energy efficiency in dual-motor vehicles, as there are many instances when the car can efficiently operate with just one motor running.
When the accelerator is pressed, the motor wakes up rapidly, usually within 1-2 milliseconds, as observed in the Tesla Model S. This quick wake-up time ensures that the driver does not perceive any delay, and the car responds instantly to the command for more torque. The rapid wake-up time is a significant advantage over the slow engine startup of stop-start hybrid vehicles.
The torque sleep feature is controlled by algorithms that determine when to power down and wake up the motor based on various factors, such as driving habits, tire conditions, and other variables. This powering up and down process occurs in fractions of seconds and is seamless to the driver.
While torque sleep has been generally well-received for its energy-saving benefits, there have been some concerns raised about potential safety issues. Some users have reported reduced power and safety failures, which may be related to flaws in the torque sleep implementation or hardware design. However, it is important to note that these issues could also be due to firmware or software problems, and Tesla is working to address these concerns.
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Torque sleep is controlled by a range mode setting
Torque sleep is a concept developed by Tesla for its dual-motor vehicles. It involves putting one motor to sleep to save power when torque is not needed, such as when the car is at rest or coasting. This feature can be controlled by a "range mode" setting, which modifies the heating and cooling of the battery and cabin.
The range mode setting for torque sleep is intended to be used only when necessary as it can impact battery longevity and cabin comfort. When engaged, range mode limits the power of the climate control system, reducing its effectiveness in warming or cooling the cabin. This setting also changes the heating and cooling of the battery, potentially impacting its longevity.
In dual-motor vehicles, torque sleep allows one motor to sleep while the other maintains control, resulting in energy savings. This is particularly beneficial for rear-wheel-drive cars, as it allows them to achieve similar efficiency to all-wheel-drive models. The feature can be manually controlled by the driver, who can choose to enable or disable torque sleep as needed.
While torque sleep is designed to improve efficiency, some users have reported issues with reduced power and safety failures when the feature is enabled. These problems may be due to software bugs or hardware design flaws, and Tesla has worked to address them through updates and improvements to the torque sleep functionality.
Overall, torque sleep is a valuable feature for dual-motor vehicles, offering the potential for energy savings and extended range. The range mode setting allows drivers to control this feature, optimizing their vehicle's performance and efficiency based on their specific needs and conditions.
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Torque sleep is not recommended for regular use
Torque sleep is a concept developed by Tesla for its dual-motor vehicles, which allows one motor to be put to sleep to save power when it is not needed. This is akin to a modern computer that can sleep in between keystrokes. While the motor is asleep, it continues spinning, and the wake-up time is so fast that the driver cannot perceive it. This feature is especially beneficial for highway cruising.
However, torque sleep is not recommended for regular use. Firstly, it affects the heating and cooling system of the vehicle. When torque sleep is enabled, the climate control is limited, which can impact the comfort of the driver and passengers. The range mode, which is used to enable torque sleep, changes the heating and cooling of the battery, compromising optimal battery longevity.
Additionally, torque sleep may not be ideal for driving on slippery or icy roads. On such surfaces, it is essential to have constant torque applied to all wheels to maintain traction and prevent skidding. While torque sleep is designed to wake up the sleeping motor upon acceleration or deceleration, there are concerns about its effectiveness in preventing wheel slip. Some users have questioned whether the Electronic Stability Control (ESC) or traction control systems can detect a slip and automatically wake up the sleeping motor. As a result, it is recommended to disable torque sleep on slippery surfaces to ensure better control and safety.
Furthermore, the energy savings from torque sleep may vary depending on driving conditions and habits. Some users have reported minimal or indiscernible benefits in terms of energy efficiency, especially for Rear Wheel Drive (RWD) cars. The impact of torque sleep on battery temperatures and overall energy regeneration is also a subject of discussion among users.
In conclusion, while torque sleep can provide some energy savings, it is not advised for regular use due to its potential impact on climate control, battery longevity, and traction on slippery roads. It is essential to refer to official Tesla sources and guidelines for the most accurate and up-to-date information regarding the use of torque sleep.
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Torque sleep is not compatible with permanent magnet motors
Torque sleep is a concept developed by Tesla for its dual-motor vehicles, which allows one motor to sleep when torque is not needed, thus saving power. This method is far superior to the engine startup in stop-start hybrid vehicles. However, torque sleep is not compatible with permanent magnet motors.
A Tesla technician explained that the dual-motor Model 3 gets less range than the single motor because torque sleep is impossible when one motor is a permanent magnet type. This is because a permanent magnet motor cannot free-wheel, and thus, it must either drive or regenerate whenever the car is moving. In addition, a permanent magnet motor cannot be turned off without a mechanical disconnect. When the circuit is open, the motor can spin freely, but it will passively generate electricity and increase the bus voltage in the car.
The inherent design of the induction motor, which is the alternative to the permanent magnet motor, includes a slip between the rotor and stator, which limits efficiency. However, recent advances in permanent magnet motors have improved their performance and energy efficiency, making them a superior choice.
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Frequently asked questions
Torque sleep is a concept developed by Tesla for its dual-motor vehicles. It involves putting one motor to sleep when torque is not needed to save power and increase the vehicle's range.
Torque sleep allows a vehicle's motor to go to sleep while the vehicle is in motion or at rest. The motor instantly wakes up when the accelerator is pressed, and the driver does not perceive the wake-up time.
It is unclear whether torque sleep affects battery temperature. While some sources claim that it does not, others suggest that it changes the heating and cooling of the battery, impacting battery longevity.
