Transmission oil temperature estimation systems and methods
View Patent ↗A system for a vehicle includes a filter module and a coefficient determination module. The filter module generates a valve body oil temperature signal as a function of a transmission oil temperature signal, the valve body oil temperature signal, and a filter coefficient. The coefficient determination module varies the filter coefficient based on the valve body oil temperature signal. The transmission oil temperature signal corresponds to a first temperature of transmission oil measured at a location between a torque converter and a variable bleed solenoid (VBS). The valve body oil temperature signal corresponds to a second temperature of transmission oil provided to a clutch of a transmission from a valve body.
1. A system for a vehicle, comprising:
a first electronic circuit that generates a valve body oil temperature signal as a function of a transmission oil temperature signal, a previous value of the valve body oil temperature signal, and a filter coefficient,
wherein the transmission oil temperature signal corresponds to a first temperature of transmission oil measured at a location between a torque converter and a variable bleed solenoid (VBS), and
wherein the valve body oil temperature signal corresponds to a second temperature of transmission oil provided to a clutch of a transmission from a valve body; and
a second electronic circuit that varies the filter coefficient based on the valve body oil temperature signal.
2. The system of claim 1 wherein the second electronic circuit increases the filter coefficient when the valve body oil temperature signal increases.
3. The system of claim 1 wherein the second electronic circuit decreases the filter coefficient when the valve body oil temperature decreases.
4. The system of claim 1 wherein the second electronic circuit generates the filter coefficient using one of a function and a mapping that relates the valve body oil temperature signal to the filter coefficient.
5. The system of claim 1 wherein the first electronic circuit sets the valve body oil temperature signal equal to a sum of the valve body oil temperature signal and a product of the filter coefficient and a difference between the valve body oil temperature signal and the transmission oil temperature signal.
6. The system of claim 1 wherein the first electronic circuit generates the valve body oil temperature signal using a Kalman filter.
7. The system of claim 1 further comprising a third electronic circuit that controls a pressure of the transmission oil provided to the clutch based on the valve body oil temperature signal.
8. A method for a vehicle, comprising:
generating, using a filter module, a valve body oil temperature signal as a function of a transmission oil temperature signal, a previous value of the valve body oil temperature signal, and a filter coefficient,
wherein the transmission oil temperature signal corresponds to a first temperature of transmission oil measured at a location between a torque converter and a variable bleed solenoid (VBS), and
wherein the valve body oil temperature signal corresponds to a second temperature of transmission oil provided to a clutch of a transmission from a valve body; and
varying, using a coefficient determination module, the filter coefficient based on the valve body oil temperature signal.
9. The method of claim 8 further comprising increasing the filter coefficient when the valve body oil temperature signal increases.
10. The method of claim 8 further comprising decreasing the filter coefficient when the valve body oil temperature decreases.
11. The method of claim 8 further comprising generating the filter coefficient using one of a function and a mapping that relates the valve body oil temperature signal to the filter coefficient.
12. The method of claim 8 further comprising setting the valve body oil temperature signal equal to a sum of the valve body oil temperature signal and a product of the filter coefficient and a difference between the valve body oil temperature signal and the transmission oil temperature signal.
13. The method of claim 8 further comprising generating the valve body oil temperature signal using a Kalman filter.
14. The method of claim 8 further comprising controlling a pressure of the transmission oil provided to the clutch based on the valve body oil temperature signal.
15. A method for a vehicle, comprising:
ouputting, from a filter module, a valve body oil temperature signal;
inputting, to the filter module, a previous value of the valve body oil temperature signal, a transmission oil temperature signal, and a filter coefficient,
wherein the transmission oil temperature signal corresponds to a first temperature of transmission oil measured at a location between a torque converter and a variable bleed solenoid (VBS), and
wherein the valve body oil temperature signal corresponds to a second temperature of transmission oil provided to a clutch of a transmission from a valve body; and
varying, using a coefficient determination module, the filter coefficient based on the valve body oil temperature signal.
16. The system of claim 1 wherein the first and second electronic circuits include at least one of an Application Specific Integrated Circuit (ASIC), a processor, a combinational logic circuit, and a field programmable gate array (FPGA).