JP6135036B2 - Transmission oil temperature control device - Google Patents

Description

The present invention relates to a transmission oil temperature control device capable of adjusting the temperature rise and cooling of a transmission while ensuring the heating performance of a heater even at low temperatures.

The heater in the automobile is connected to a heater circuit through which water circulates in the engine, and the heater circuit water heated by the engine is radiated by the heater. On the other hand, transmission oil circulates in the transmission, and a transmission warmer is provided as a heating / cooling device for the oil. The transmission warmer is incorporated in the heater circuit described above, and can be used for raising the temperature of the oil in the process of warming up the transmission. This is because the rate at which water rises due to heat generated by engine combustion is greater than the rate at which oil rises due to loss of power transmission in the transmission. The oil warming process by the transmission warmer can reduce transmission loss torque and improve fuel efficiency.

On the other hand, once the warming of the transmission oil is completed, the heater circuit water serves as an oil cooling medium. This is because the upper limit of the temperature rise of water is about 100 ° C., and the oil can be further heated, so that the heater circuit water has a lower temperature after the warm-up is completed.

However, since the heat quantity of the engine water temperature (heater circuit water) is taken into the transmission oil during the warm-up process, the temperature rise of the cooling water is delayed at a very low temperature, which causes a problem in the heating performance of the heater. Therefore, for example, Patent Document 2 has a control configuration that stops heating the transmission when the temperature of the engine coolant is low. In particular, in the case of a small vehicle such as a light vehicle, the amount of heat of the engine is small, and the engine water temperature is difficult to warm.

JP 2005-83225 A

The present invention has been created in view of the above circumstances, and has a control configuration that improves the heating performance of the heater by stopping the transmission from heating when the vehicle interior temperature is low and preferentially heating the heater. An object of the present invention is to provide a temperature control device for transmission oil.

In order to achieve the above object, the present invention provides a temperature control device for transmission oil in which a transmission warmer for heating and cooling the transmission oil is incorporated in a heater circuit. In this transmission oil temperature control apparatus, the heater circuit has a normal heater circuit that passes through the transmission warmer and a bypass switching circuit that does not pass through the transmission warmer. The temperature control device of the present transmission oil, interior temperature and detects the outside temperature, when the interior temperature and the outside temperature detected is respectively higher than a predetermined temperature switches to the normal heater circuit, the inside temperature Is switched to the bypass switching circuit when the vehicle interior temperature is equal to or higher than the predetermined temperature and the vehicle exterior temperature is lower than the predetermined temperature .

According to the temperature control device for transmission oil of the present invention, the transmission oil is usually heated by passing the heater circuit water through the transmission warmer to warm the transmission, but when the vehicle interior temperature is low during the warming process, Priority is given to heating the heater by controlling to switch to a bypass switching circuit that does not pass through the transmission warmer. In particular, this transmission oil temperature control device is characterized in that the heating property of the heater is prioritized by detecting the temperature inside the vehicle. Therefore, even in a vehicle with a small amount of heat of an engine such as a light vehicle, the amount of heat is not lost to the transmission oil during the warming process, and it is possible to prevent the heater from being ineffective.

As described above, the transmission oil temperature control apparatus of the present invention can adjust the temperature management of the transmission while ensuring the heating performance of the heater even at low temperatures.

(A) is a schematic diagram showing how a heater circuit water (engine water temperature) and a transmission warmer are used to warm the transmission, and (b) a heater circuit water temperature change and a transmission oil temperature change. A graph showing is shown. (A) is a schematic diagram showing how the transmission is warmed using the heater circuit water 6 and the transmission warmer 4 in this embodiment, and (b) is a temperature change of the heater circuit water and the temperature of the transmission oil. The graph which compared the case shown in FIG.1 (b) with the case of this embodiment about a change is shown. In the present embodiment, an example of a control flow for the condition for switching between the bypass circuit 9 and the normal heater circuit 6 is shown.

Then, the brake device concerning one embodiment of the present invention is explained in detail, referring to drawings.
First, the temperature control of transmission oil using a general transmission warmer will be described.

In FIG. 1, (a) shows a schematic diagram showing a state in which the transmission is heated using heater circuit water (engine temperature) and a transmission warmer, and (b) shows the temperature change of the heater circuit water and the transmission. The graph which shows the temperature change of oil is shown.

As shown in FIG. 1A, the heater circuit water 6 (also referred to as “heater circuit 6” when referring to a circuit through which the heater circuit water flows) is approximately in order in the engine 1, the heater 3, and the transmission warmer 4. Circulate. The heater circuit water 6 first rises in the process of circulating through the engine 1. The water heated in the engine 1 circulates in the heater 3, and in the process, the piping through which the heater circuit water 6 flows is brought into contact with the vehicle interior atmosphere to dissipate heat, and the vehicle interior temperature rises. On the contrary, the heater circuit water 6 falls.

Further, the heater circuit water 6 reaches the transmission warmer 4. The transmission warmer 4 also circulates transmission oil 7 that circulates in the transmission 2. The transmission warmer 4 is one of heat exchangers that raise the temperature of the transmission oil 7 by receiving the temperature of the heater circuit water 6 during the warming process of the engine 1 and is a device for improving fuel consumption. The transmission warmer 4 is also used for cooling the transmission oil 7.

FIG. 1 (b) shows the relationship between the passage of time and the temperature of the heater circuit water (E / G water) 6 and the transmission oil (T / M oil) 7. As is clear from this graph, the heater circuit water 6 has a higher thermal conductivity than the transmission oil 7 and thus rises in temperature first. Therefore, in the warm-up process T shortly after the engine 1 is started, the heater circuit water 6 is radiated by the transmission warmer 4 to raise the temperature of the transmission oil 7. Conversely, when a certain amount of time T ′ has elapsed since the engine 1 was started, the transmission oil 7 is cooled by the heater circuit water 6. As shown in FIG. 1B, the temperature of the heater circuit water 6 converges near the boiling point of 100 ° C., whereas the transmission oil 7 having a higher boiling point rises even when the temperature exceeds 100 ° C. At this time, the transmission oil 7 is cooled by the heater circuit water 6 which does not exceed 1000 ° C.

In addition, not only the heater circuit water 6 but also the cooling circuit 8 exists in order to cool the engine 1 with the radiator 5 as the water channel circulating through the engine 1. In FIG. 1 (a), the heater circuit water 6 circulates more in the engine 1 than the cooling circuit 8 of the radiator 5, but the cooling circuit 8 cools the entire engine 1 and is actually cooled. The circuit 8 circulates more greatly, and the amount of heat dissipated by the radiator 5 is also large.

Next, an embodiment of a temperature control device for transmission oil 7 according to the present invention will be described. FIG. 2A is a schematic diagram showing how the transmission 2 is warmed using the heater circuit water 6 and the transmission warmer 4 in the present embodiment, and FIG. 2B shows the temperature change of the heater circuit water 6. The graph which compared the case where it shows in FIG.1 (b) and the case of this embodiment about the temperature change of the transmission oil 7 is shown.

As shown in FIG. 2A, the heater circuit water 6 circulates in the engine 1, the heater 3 and the transmission warmer 4 in order in the same manner as in FIG. Circulates in the heater 3 to dissipate heat, thereby raising the temperature inside the vehicle. Then, the heater circuit water 6 reaches the transmission warmer 4, and the temperature of the transmission oil 7 circulating in the transmission 2 is raised by the heater circuit water 6. Here, in the warm-up process shortly after the start of the engine 1, the heater circuit water 6 is not yet warmed. Therefore, if the heat is deprived by the transmission warmer 4, the heating performance of the heater 3 is significantly lowered. This is particularly noticeable when the capacity of the engine 1 is small, such as a light vehicle.

In the present embodiment, a bypass circuit 9 is provided so that the heater circuit water 6 does not pass through the transmission warmer 4 before passing through the transmission warmer 4, and the normal heater circuit 6 and the bypass circuit 9 can be switched by the switching valve 10. Yes. Therefore, when a predetermined condition of the warm-up process is satisfied (described later), the amount of heat of the engine 1 can be preferentially turned to the heater 3 by switching the heater circuit 6 to the bypass circuit 9, and the heater circuit can be operated with a simple circuit configuration. Heating performance can be greatly improved.

Here, with reference to FIG. 2B, regarding the temperature change (with bypass) of the heater circuit water 6 and the transmission oil 7 of the embodiment of the present invention, the temperature change (bypass) of the previous heater circuit water 6 and the transmission oil 7 (None). In the case of FIG. 2B, the condition for switching to the bypass circuit 9 is that the in-vehicle temperature is equal to or lower than a predetermined temperature (for example, the temperature a or lower (see FIG. 3)). (That is, switched to the bypass circuit 9). First, as described with reference to FIG. 1B, the temperature change in the case where the conventional bypass circuit 9 is not provided, the heater circuit water 6 has a higher thermal conductivity than the transmission oil 7, so that the temperature rises first. It can be seen that the heater circuit water 6 also rises relatively slowly.

Next, referring to the case of the present embodiment having the bypass circuit 9, the temperature is switched to the bypass circuit 9 until time T ″, and the temperature rise speed of the heater circuit water 6 is higher than that without the bypass circuit 9. It can be seen that the speed of temperature increase of the transmission oil 7 is slow, and conversely. From this, the switching of the bypass circuit 9 in this embodiment can secure the heating performance of the heater in the warming process in which the vehicle interior temperature is low, and the disadvantage of the transmission warmer 4 that the heater performance deteriorates in the warming process. It can be resolved. Therefore, when this embodiment is adopted, the transmission warmer 4 can be adopted even in a vehicle having a small engine heat quantity such as a light vehicle.

Next, FIG. 3 shows an example of the control flow for the conditions for switching the bypass circuit 9 and the normal heater circuit 6 in the transmission oil temperature control apparatus. In the case of the present embodiment, the condition for switching to the bypass circuit 9 is to place the highest priority on the vehicle interior temperature, and in addition to this, the vehicle exterior temperature and the water temperature of the engine 1 (that is, the water temperature of the heater circuit water 6) are also switched. Can do. In the case of the flowchart of FIG. 3, it is a case where all of the inside temperature, the outside temperature, and the engine water temperature are viewed. It should be noted that various temperatures such as the temperature inside the vehicle receive signals from existing automatic air conditioners and engine ECUs to operate the switching valve 10.

As shown in S1, the vehicle interior temperature t1 is first detected. When t1 is determined to be less than the predetermined temperature a ° C. (t1 <a) (see S2), the switching valve 10 is operated and switched to the bypass circuit 9 (see S7). The predetermined temperature a ° C. is a temperature at which cold is determined, and is set to 5 ° C., for example. Next, the vehicle outside temperature t2 is detected (see S3), and when it is determined that the vehicle outside temperature t2 is less than the predetermined temperature b ° C. (t2 <b) as in the case of the vehicle interior temperature t1 (S4), the switching valve 10 Is switched to the bypass circuit 9 (see S7). The predetermined temperature b ° C. of the vehicle outside temperature t2 is a temperature lower than the vehicle interior temperature a ° C. (a> b), and is set to 3 ° C., for example. In this embodiment, the vehicle temperature t1 is the highest priority criterion for switching to the bypass circuit 9. However, even when the vehicle interior temperature t2 is not low, the vehicle exterior temperature t2 is lower than that, and the heater circuit water 6 is heated during This is because it may be possible to prioritize the temperature rise. For example, immediately after going out of the garage in a cold district or the like.

Further, next, the temperature t3 of the water temperature of the engine 1 (the result is the same as the heater circuit water 6) is detected (see S5), and the water temperature t3 of the engine 1 is predetermined as in the case of the determination of the vehicle interior temperature t1 and the vehicle exterior temperature t2. When it is determined that the temperature is less than c ° C. (t3 <c) (S6), the switching valve 10 is operated and switched to the bypass circuit 9 (see S7). Here, the predetermined temperature c ° C. of the water temperature t3 of the engine 1 is set to a temperature lower than the vehicle interior temperature b ° C. (a> c), and is set to 0 ° C., for example. When the vehicle interior temperature t1 <a, the vehicle exterior temperature t2 <b, and the water temperature t3 <c of the engine 1 are not satisfied, the normal heater circuit water 6 remains as it is without switching to the bypass circuit 9 (see S8).

The embodiment and the concept of the transmission oil temperature control device of the present invention have been described above, but the present invention is not limited to this, and departs from the spirit and teaching described in the claims and the description. It will be understood by those skilled in the art that other variations and modifications can be obtained without departing from the scope.

1 Engine 2 Transmission 3 Heater 4 Transmission Warmer 5 Radiator 6 Heater Circuit Water (Heater Circuit)
7 Transmission oil 8 Cooling water 9 Bypass circuit 10 Switching valve

Claims (1)

A transmission oil temperature control device incorporating a transmission warmer for heating and cooling the transmission oil in a heater circuit,
The heater circuit has a normal heater circuit that passes through the transmission warmer and a bypass switching circuit that does not pass through the transmission warmer,
The inside temperature and the outside temperature are detected, and when the detected inside temperature and outside temperature are respectively equal to or higher than a predetermined temperature, switching to the normal heater circuit is performed, and the inside temperature is less than the predetermined temperature or the inside temperature is predetermined. A transmission oil temperature control device that performs control to switch to the bypass switching circuit when the temperature is equal to or higher than the temperature and the outside temperature is lower than a predetermined temperature .