JP4802715B2 - Temperature rise prediction device, route guidance system including the same, vehicle equipped with the same, temperature rise prediction method, route guidance method, and thermal load prediction device - Google Patents

Description

  The present invention relates to a temperature rise prediction device, a route guidance system including the same, a vehicle equipped with the same, a temperature rise prediction method, a route guidance method, and a thermal load prediction device.

Conventionally, as this type of temperature rise prediction device, a device mounted on a vehicle that can travel using power from an engine has been proposed (see, for example, Patent Document 1). In this device, when the road surface to be traveled is an uphill slope, a prediction calculation is made as to whether or not the temperature of the engine coolant exceeds a preset upper limit value based on the slope. In a vehicle equipped with this device, when the temperature of the coolant is predicted to exceed the upper limit value by the prediction calculation, the schedule control is performed to lower the coolant temperature in advance before reaching the planned uphill road surface. As a result, the temperature of the coolant is suppressed from exceeding the upper limit value.
JP 2003-328756 A

  In such a vehicle, if the temperature of the coolant exceeds the upper limit value, it is necessary to limit the output from the engine to protect the engine or the like. Therefore, it is desirable that the temperature of the coolant does not exceed the upper limit value as much as possible. . For this reason, it is desirable to perform the prediction calculation as to whether or not the temperature of the cooling water exceeds the upper limit value with higher accuracy. In such a vehicle, even when the temperature of the cooling water is predicted to exceed the upper limit value, there is a case where it is desired to improve the convenience of the driver by another method without performing the scheduled control.

  The temperature rise prediction apparatus of the present invention, a route guidance system including the same, a vehicle equipped with the temperature rise prediction method, a temperature rise prediction method, and a route guidance method include a power source until a vehicle reaches a destination on a travel route to the destination. One of the purposes is to more appropriately predict whether or not the temperature of the included power system exceeds a predetermined temperature. Another object of the route guidance system, the vehicle equipped with the route guidance system, and the route guidance method of the present invention is to further improve the convenience for the operator. Furthermore, the thermal load prediction apparatus of the present invention has an object of more appropriately predicting the thermal load of the power system including the power source until the vehicle reaches the destination on the travel route to the destination.

  The temperature rise prediction device, the vehicle equipped with the same, the temperature rise prediction method, and the thermal load prediction device of the present invention employ the following means in order to achieve at least a part of the above object.

The temperature rise prediction apparatus of the present invention is
A temperature rise prediction device that is mounted on a vehicle capable of traveling by power from a power source and predicts whether or not the temperature of a power system including the power source rises above a predetermined temperature,
Map information storage means for storing map information including information about roads;
Current position detecting means for detecting the current position of the vehicle;
Travel path search means for searching for a first travel path as a travel path from the detected current position of the vehicle to the destination according to predetermined conditions using the stored map information when a destination is set; ,
Weight detection means for detecting the weight of the vehicle;
Based on the stored map information and the detected weight of the vehicle, the temperature of the power system is changed to the predetermined temperature until the vehicle reaches the set destination on the searched first travel path. A temperature rise prediction means for predicting whether to rise above
It is a summary to provide.

  In this temperature rise prediction device of the present invention, when the destination is set, the first travel route is searched as a travel route from the current position of the vehicle to the destination by using map information including information on the road according to a predetermined condition. Then, based on the map information and the weight of the vehicle, it is predicted whether or not the temperature of the power system will rise above a predetermined temperature before the vehicle reaches the destination on the first travel path. The heat load of the power system depends not only on the conditions of roads such as uphill roads and downhill roads but also on the weight of the vehicle. Therefore, only the map information is obtained by predicting whether the temperature of the power system rises above a predetermined temperature before the vehicle reaches the destination on the first travel path based on the map information and the weight of the vehicle. It is possible to predict more appropriately than what is predicted based on the above. Here, in addition to the power source, the “power system” may include a drive unit that drives the power source, a transmission unit that transmits power from the power source to the axle side, and the like.

  In such a temperature rise prediction device of the present invention, the temperature rise prediction means is a means for making a prediction based on information relating to a road surface gradient in the stored map information and the detected weight of the vehicle. You can also By so doing, it is possible to more appropriately predict whether or not the temperature of the power system will rise beyond a predetermined temperature based on the road surface gradient and the weight of the vehicle.

The route guidance system of the present invention is
A route guidance system that provides route guidance for a travel route,
A temperature rise prediction apparatus according to any one of the above-described aspects;
When it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the set destination on the searched first travel path by the temperature rise prediction means, The temperature rise prediction means predicts that the temperature of the power system will not rise above the predetermined temperature until the vehicle reaches the destination, from the detected current position of the vehicle to the destination. A travel path re-search means for re-searching the second travel path as a travel path using the stored map information;
When it is predicted that the temperature of the power system will not exceed the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, the first travel path is output. When it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, the first travel path And travel path output means for selectively outputting the re-searched second travel path,
Route guidance means for performing route guidance based on the output travel route;
It is a summary to provide.

  In the route guidance system of the present invention, the temperature rise prediction device of the present invention of any one of the above aspects is mounted, and when the destination is set, the destination is set from the current position of the vehicle according to predetermined conditions using map information. The first travel route is searched as a travel route to the ground, and the temperature of the power system including the power source reaches a predetermined temperature before the vehicle reaches the destination on the first travel route based on the map information and the weight of the vehicle. When the temperature of the power system is predicted to rise beyond a predetermined temperature, the temperature of the power system rises above the predetermined temperature until the vehicle reaches the destination. The second travel route as the travel route from the current position of the vehicle predicted to not be performed to the destination is searched again using the map information. Then, when it is predicted that the temperature of the power system will not exceed the predetermined temperature until the vehicle reaches the destination on the first travel path, the first travel path is output, and the vehicle uses the first travel path for the purpose. When it is predicted that the temperature of the power system will rise above a predetermined temperature before reaching the ground, the first travel path and the second travel path are selectably output, and route guidance is performed based on the output travel path. To do. As a result, the effect exhibited by the temperature rise prediction device of the present invention, for example, whether or not the temperature of the power system rises above a predetermined temperature before the vehicle reaches the destination on the first travel path is only map information. The same effects as those that can be predicted more appropriately than those predicted based on the above can be obtained. In addition, when it is predicted that the temperature of the power system rises above a predetermined temperature before the vehicle reaches the destination on the first travel path, the operator can select between the first travel path and the second travel path. Therefore, the convenience of the operator can be improved.

  In such a route guidance system of the present invention, the route guidance means provides route guidance for the first travel route when the first travel route is output, and the first travel route and the second travel route are selected. When output is possible, it may be a means for performing route guidance on a travel route selected by the operator from the first travel route and the second travel route. In this case, the route guidance for the first travel route can be performed in the former case, and the route guidance for the travel route selected by the operator from the first travel route and the second travel route in the latter case. Can be performed.

  In the route guidance system according to the present invention, the travel route output means includes display means for displaying a travel route to the destination, and the vehicle sets the searched destination for the first travel route. When it is predicted that the temperature of the power system will rise above the predetermined temperature before reaching, it is predicted that the temperature of the power system in the first travel path will not rise above the predetermined temperature. The travel section to be displayed is displayed on the display means in the first display format, and the travel section in which the temperature of the power system is predicted to rise above the predetermined temperature on the first travel path is displayed on the first display. It may be a means for displaying on the display means in a second display format different from the format, and displaying the re-searched second travel route in the first display format. If it carries out like this, an operator can be made to recognize the driving | running | working area where it is predicted that the temperature of a power system will rise exceeding predetermined temperature among 1st driving | running paths.

The vehicle of the present invention
A vehicle capable of traveling by power from a power source,
A route guidance system according to any of the above-described aspects;
Temperature detecting means for detecting the temperature of the power system;
Power limiting means for limiting the power output from the power source when the detected temperature is equal to or higher than the predetermined temperature;
It is a summary to provide.

  Since the vehicle of the present invention includes the route guidance system of the present invention according to any one of the aspects described above, the vehicle has the same effect as the effect exhibited by the route guidance system of the present invention, for example, the first travel path as the destination. Compared with predictions based on map information only, whether the temperature of the power system will rise beyond the predetermined temperature before reaching the target is improved and the convenience of the operator is improved. The same effects as those that can be achieved can be achieved. In addition, when the temperature of the power system is equal to or higher than a predetermined temperature, by limiting the power output from the power source, it is possible to suppress the thermal load of the power system and suppress an excessive temperature rise of the power system.

  In the vehicle according to the present invention, the power source may be an electric motor. The power source is connected to the internal combustion engine and the internal combustion engine and the axle side, and is connected to the internal combustion engine and the axle side to output at least part of the power from the internal combustion engine to the axle side with input and output of electric power and power. Output means and an electric motor capable of inputting and outputting power to the axle side may be provided.

The temperature rise prediction method of the present invention is
A temperature rise prediction method for predicting whether or not the temperature of a power system including a power source rises above a predetermined temperature, which is mounted on a vehicle capable of traveling by power from a power source,
(A) When the destination is set, the first travel route is searched as a travel route from the current position of the vehicle to the destination by using predetermined map information including information on the road,
(B) The temperature of the power system exceeds the predetermined temperature before the vehicle reaches the set destination on the first travel path searched based on the map information and the weight of the vehicle. Predict whether it will rise,
Temperature rise prediction method.

  In this temperature rise prediction method of the present invention, when the destination is set, the first travel route is searched as a travel route from the current position of the vehicle to the destination by using map information including information on the road according to a predetermined condition. Then, based on the map information and the weight of the vehicle, it is predicted whether or not the temperature of the power system will rise above a predetermined temperature before the vehicle reaches the destination on the first travel path. The heat load of the power system depends not only on the conditions of roads such as uphill roads and downhill roads but also on the weight of the vehicle. Therefore, only the map information is obtained by predicting whether the temperature of the power system until the vehicle reaches the destination on the first travel path rises above a predetermined temperature based on the map information and the weight of the vehicle. It is possible to predict more appropriately than what is predicted based on the above. Here, in addition to the power source, the “power system” may include a drive unit that drives the power source, a transmission unit that transmits power from the power source to the axle side, and the like.

The route guidance method of the present invention
A route guidance method that is mounted on a vehicle capable of traveling by power from a power source and performs route guidance of a traveling route,
(A) When the destination is set, the first travel route is searched as a travel route from the current position of the vehicle to the destination by using predetermined map information including information on the road,
(B) Based on the map information and the weight of the vehicle, the temperature of the power system including the power source exceeds the predetermined temperature before the vehicle reaches the set destination on the first travel path. Predict whether or not to rise,
(C) When it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the destination on the first travel path, the vehicle reaches the destination. The second traveling path as the traveling path from the current position of the vehicle to the destination where the temperature of the power system is predicted not to rise above the predetermined temperature is searched again using the map information. ,
(D) When it is predicted that the temperature of the power system will not exceed the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, the first travel is performed. Output the road, and when it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the set destination on the searched first traveling road, 1 road and the re-searched second road are output to be selectable,
(E) Route guidance is performed based on the output travel route.

  In the route guidance method of the present invention, when the destination is set, the map information is used to search the first travel route as the travel route from the current position of the vehicle to the destination using predetermined information, and the map information and the vehicle On the basis of the weight of the power system, it is predicted whether or not the temperature of the power system including the power source rises above a predetermined temperature before the vehicle reaches the destination on the first travel path. As a travel path from the current position of the vehicle to the destination where the temperature of the power system is predicted not to rise above the predetermined temperature until the vehicle reaches the destination The second travel route is searched again using the map information. Then, when it is predicted that the temperature of the power system will not exceed the predetermined temperature until the vehicle reaches the destination on the first travel path, the first travel path is output, and the vehicle uses the first travel path for the purpose. When it is predicted that the temperature of the power system will rise above a predetermined temperature before reaching the ground, the first travel path and the second travel path are selectably output, and route guidance is performed based on the output travel path. To do. As a result, it is more appropriate to predict whether or not the temperature of the power system will rise above a predetermined temperature by the time the vehicle reaches the destination on the first travel path, compared to the case where the prediction is based only on the map information. can do. In addition, when it is predicted that the temperature of the power system rises above a predetermined temperature before the vehicle reaches the destination on the first travel path, the operator can select between the first travel path and the second travel path. Therefore, the convenience of the operator can be improved.

The thermal load prediction device of the present invention is
A thermal load prediction device that is mounted on a vehicle capable of traveling by power from a power source and predicts a heat load of a power system including the power source,
Map information storage means for storing map information including information about roads;
Current position detecting means for detecting the current position of the vehicle;
Travel path search means for searching for a first travel path as a travel path from the detected current position of the vehicle to the destination according to predetermined conditions using the stored map information when a destination is set; ,
Weight detection means for detecting the weight of the vehicle;
Thermal load of the power system until the vehicle reaches the set destination after traveling on the searched first travel path based on the stored map information and the detected weight of the vehicle A heat load predicting means for predicting
It is a summary to provide.

  In the thermal load predicting apparatus of the present invention, when the destination is set, the first traveling path is searched as the traveling path from the current position of the vehicle to the destination by using map information including information on the road according to a predetermined condition. Then, based on the map information and the weight of the vehicle, the heat load of the power system until the vehicle reaches the destination after traveling on the first travel path is predicted. The heat load of the power system depends not only on the conditions of roads such as uphill roads and downhill roads but also on the weight of the vehicle. Therefore, by predicting the heat load of the power system based on the map information and the weight of the vehicle before the vehicle reaches the destination on the first travel path, compared to what is predicted based only on the map information It can be predicted more appropriately. Here, in addition to the power source, the “power system” may include a drive unit that drives the power source, a transmission unit that transmits power from the power source to the axle side, and the like. Further, the “thermal load of the power system” is a concept including the “temperature of the power system” described above.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of a configuration of an electric vehicle 20 as an embodiment of the present invention. As shown in the drawing, the electric vehicle 20 of the embodiment includes a motor 22 that can input and output power to a drive shaft 32 connected to drive wheels 30 a and 30 b via a differential gear 31, and an inverter 24 that drives the motor 22. A battery 26 that exchanges electric power with the motor 22, an electronic control unit 40 that controls the entire vehicle, and a navigation system 60 that communicates with the electronic control unit 40.

  The motor 22 is configured as a PM type synchronous generator motor including a rotor having a permanent magnet attached to the outer peripheral surface and a stator around which a three-phase coil is wound. The inverter 24 is configured by six switching elements, converts the DC power supplied from the battery 26 into pseudo three-phase AC power, and supplies the pseudo three-phase AC power to the motor 22.

  The navigation system 60 includes a main body 61 including a storage medium such as a hard disk in which map information 63 and the like are stored and a control unit having a communication port, a GPS antenna 65 that receives information on the current position of the vehicle, A touch-panel display 66 that displays information related to the current position and various information such as the travel route to the destination and can input various instructions by the operator, and map information when the destination is set by the operator The travel route to the destination is retrieved based on the current position of the vehicle 63 and the destination, and the retrieved travel route is displayed on the display 66 to provide route guidance. The map information 63 stores service information (tourist information, parking lots, etc.) and road information for each predetermined travel section in a database. The road information includes distance information, width information, region Information (city area, suburb), type information (general road, highway), gradient information (road surface gradient θ), legal speed, number of traffic lights, etc. are included. The navigation system 60 is in communication with the electronic control unit 40.

  The electronic control unit 40 is configured as a microprocessor centered on a CPU. In addition to the CPU 42, a ROM 44 for storing processing programs, a RAM 46 for temporarily storing data, an input / output port and a communication port (not shown), Is provided. The electronic control unit 40 includes a motor temperature tm from the temperature sensor 22 a that detects the temperature of the motor 22, a motor rotation speed Nm from the rotation speed sensor 23 that detects the rotation speed of the motor 22, and a temperature that detects the temperature of the battery 26. From the battery temperature tb from the sensor 26a, the ignition signal from the ignition switch 50, the shift position SP from the shift position sensor 52 that detects the operation position of the shift lever 51, and the accelerator pedal position sensor 54 that detects the depression amount of the accelerator pedal 53 The accelerator pedal opening Acc, the brake pedal position BP from the brake pedal position sensor 56 for detecting the depression amount of the brake pedal 55, the vehicle speed V from the vehicle speed sensor 58, the vehicle weight M from the vehicle weight sensor 59, etc. are input via the input port. Entered That. In the embodiment, the vehicle weight sensor 59 is not only the weight of the vehicle body but also the weight of the occupant or the total weight including the weight of the load or towed object when there is a load or towed object. Those capable of detecting M were used. The vehicle weight sensor 59 includes, for example, a sensor (not shown) that is attached to the drive wheels 30a and 30b and detects the weight of the vehicle body, the weight of the occupant, and the weight of the load, and a sensor (not shown) that detects the weight of the towed object. It is possible to use one that detects the vehicle weight M based on signals from two sensors. From the electronic control unit 40, a switching control signal to the switching element of the inverter 24 for driving and controlling the motor 22 is output via an output port. The electronic control unit 40 is connected to the navigation system 60 via a communication port, and exchanges data with the navigation system 60.

  Next, the operation of the electric vehicle 20 configured as described above will be described. FIG. 2 is a flowchart showing an example of a drive control routine executed by the electronic control unit 40 of the embodiment, and FIG. 3 is a flowchart showing an example of a route output routine executed by the navigation system 60. Hereinafter, the drive control routine of FIG. 2 will be described first, and then the route output routine of FIG. 3 will be described. The drive control routine of FIG. 2 is repeatedly executed every predetermined time (for example, every several msec).

  When the drive control routine is executed, the CPU 42 of the electronic control unit 40 firstly, the accelerator opening degree Acc from the accelerator pedal position sensor 54, the vehicle speed V from the vehicle speed sensor 58, the motor rotational speed Nm from the rotational speed sensor 23, Data necessary for control, such as the motor temperature tm from the temperature sensor 22a, the battery temperature tb from the temperature sensor 26a, and the remaining capacity SOC of the battery 26, are input (step S100). Here, the remaining capacity SOC of the battery 26 is calculated based on an integrated value of the charge / discharge current Ib charged / discharged to / from the battery 26 detected by a current sensor (not shown) and is read at a predetermined address in the RAM 46. It was supposed to be entered by

  When the data is thus input, the required torque Td * to be output to the drive shaft 32 connected to the drive wheels 30a, 30b is set based on the accelerator opening Acc and the vehicle speed V (step S110). Here, in the embodiment, the required torque Td * is determined in advance by storing the relationship between the accelerator opening Acc, the vehicle speed V, and the required torque Td * in the ROM 44 as a required torque setting map. When the vehicle speed V is given, the corresponding required torque Td * is derived from the stored map and set. An example of the required torque setting map is shown in FIG.

  Subsequently, Wout is set as the output limit of the battery 26 based on the remaining capacity SOC of the battery 26 and the battery temperature tb (step S120), and the battery 26 is obtained by dividing the set output limit Wout by the motor rotation speed Nm. The torque limit Tmax1 of the motor 22 with respect to the output limit Wout is set (step S130). Here, in the embodiment, the output limit Wout sets the basic value Wouttmp of the output limit based on the battery temperature tb, sets the correction coefficient k based on the remaining capacity SOC of the battery 26, and sets the basic of the set output limit. The value Wouttmp is set by multiplying the correction coefficient k.

  Then, based on the motor temperature tm and the motor rotation speed Nm, the torque limit Tmax2 of the motor 22 with respect to the temperature rise of the motor 22 is set (step S140). Here, in the embodiment, the torque limit Tmax2 is set to the maximum torque at the motor rotation speed Nm at that time when the motor temperature tm is equal to or lower than the predetermined temperature tmref, and at that time when the motor temperature tm is higher than the predetermined temperature tmref. A value such as 50% or 60% of the maximum torque at the motor rotation speed Nm was set. Therefore, the predetermined temperature tmref is determined by the temperature characteristics of the motor 22 as a value near the upper limit temperature at which the motor 22 can be driven with the maximum torque at the motor rotation speed Nm at that time.

  When the torque limit Tmax1 and the torque limit Tmax2 are thus set, the minimum value among the required torque Td *, the torque limit Tmax1, and the torque limit Tmax2 is set as the torque command Tm * of the motor 22 (step S150), and the set torque command Switching control of the switching element of the inverter 24 is performed so that the motor 22 is driven at Tm * (step S160), and the drive control routine is terminated. By setting the torque command Tm * of the motor 22 in this way, the required torque Td * to be output to the drive shaft 32 is set as a torque limited based on the output limit Wout of the battery 26 and the temperature tm of the motor 22. be able to. Thereby, for example, when the temperature tm is higher than the predetermined temperature tmref, the required torque Td * is limited to 50% or 60% of the maximum torque at the motor rotation speed Nm at that time, thereby causing an excessive temperature rise of the motor 22. Can be suppressed. At this time, the vehicle speed V is also limited by limiting the output from the motor 22.

  The drive control routine has been described above. Next, the operation of the navigation system 60 will be described. FIG. 3 is a flowchart showing an example of a route output routine executed by the navigation system 60. This routine is executed when the destination is set by the operator.

  When the route output routine is executed, the navigation system 60 first searches for a travel route from the current position of the vehicle to the destination based on predetermined conditions using the map information 63 (step S200). Here, as the predetermined condition, for example, a route that has a width of a predetermined value (for example, 5 m) or more, a condition that should be recommended to search for a travel route so that the travel time is shortened considering legal speed, and a toll road as much as possible Toll road priority condition to search for travel route to travel, general road priority condition to search travel route only on general road without traveling on toll road, distance to search for travel route so that travel distance is the shortest There is a priority condition, a time priority condition for searching for a travel route so that the travel time is minimized from the legal speed. In the embodiment, the travel route is searched according to the conditions selected by the operator among these conditions.

  Thus, when the travel route from the current position of the vehicle to the destination is searched (hereinafter, this travel route is referred to as route 1), the vehicle weight M from the vehicle weight sensor 59 is input (step S210), and the temperature rise prediction determination flag Both F1 and the different route re-search determination flag F2 are reset to the value 0 (step S220). Here, the temperature rise prediction determination flag F1 is set to a value 0 when the value 0 is set as an initial value and the motor temperature tm is predicted to exceed the predetermined temperature tmref before the vehicle reaches the destination. Flag to be The different route re-search determination flag F2 is a flag that is set to a value of 1 when a value of 0 is set as an initial value and another route different from the route 1 is searched again. Details of the temperature rise prediction determination flag F1 and the different route re-search determination flag F2 will be described later.

  Then, the process which extracts the driving | running route from the present position of a vehicle to the destination is performed (step S230). When this process is executed for the first time after this routine is executed, the retrieved route 1 is extracted. Then, the road gradient θ of the next travel section from the current position of the vehicle in each travel section on the extracted travel route to the destination is input (step S240), and the input road gradient θ and the vehicle weight M are input. Based on this, the temperature rise value Δtm of the motor 22 is set (step S250), and the temperature integrated value tmadd is calculated by adding the temperature rise Δtm to the previous temperature integrated value tmadd (step S260). Here, the rising temperature Δtm is a temperature change of the motor 22 estimated when the vehicle in the state of the vehicle weight M travels in the traveling section having the road surface gradient θ, and cools the temperature characteristics of the motor 22, the motor 22, and the like. It can be set based on the performance of the cooling system. In this embodiment, the rising temperature Δtm is determined in advance by experiments and the like and stored in the ROM 44 as a rising temperature setting map in relation to the road gradient θ, the vehicle weight M, and the rising temperature Δtm. When M is given, the corresponding rise temperature Δtm is derived from the stored map and set. An example of the rising temperature setting map is shown in FIG. As shown in the figure, the rising temperature Δtm is set so as to increase as the road surface gradient θ increases. This is because when the vehicle travels on an uphill road, the load on the motor 22 increases and the amount of heat generated also increases. Further, the rising temperature Δtm is set so as to increase as the vehicle weight M increases. This is because the load on the motor 22 increases when there is a load or when there is a towed object, and when a plurality of persons get on, compared to when there is no loaded object and no towed object. Because. The temperature integrated value tmadd corresponds to the motor temperature tm when the vehicle is traveling in the target travel section, and the initial value is the motor detected by the temperature sensor 22a when this routine is executed. The temperature tm was input by communication via the electronic control unit 40 and used.

  Next, the calculated temperature integrated value tmadd is compared with a predetermined temperature tmref (step S270). Here, as described above, the predetermined temperature tmref is set as a value near the upper limit temperature at which the motor 22 can be driven with the maximum torque at the motor rotation speed Nm at that time. Therefore, the comparison between the temperature integrated value tmadd and the predetermined temperature tmref in step S270 determines whether or not the output from the motor 22 is predicted to be greatly limited (the vehicle speed V is limited). When the temperature integrated value tmadd is equal to or lower than the predetermined temperature tmref, it is determined whether or not there is a next travel section, that is, whether or not the processing has been completed for all travel sections from the current position of the vehicle to the destination in the extracted route. If it is determined that there is a next travel section (step S310), the process returns to step S240. In this way, the temperature integrated value tmadd is calculated in order from the current position of the vehicle toward the destination in each traveling section, and is compared with the predetermined temperature tmref. When it is determined that there is no next travel interval, that is, it is determined that the processing has been completed for all travel sections, the value of another route re-search determination flag F2 is checked (step S320), and the value of another route re-search determination flag F2 is When it is 0, the value of the temperature rise prediction determination flag F1 is examined (step S330). Now, considering that the processing has been completed for all travel sections without the temperature integrated value tmadd once exceeding the predetermined value tmlim for the route 1, both the temperature rise prediction determination flag F1 and the separate route re-search determination flag F2 are both Since the value is 0, route 1 is output to the display 66 by a normal display method (for example, lighting display) (step S370), and the route output routine is terminated. Then, route guidance for the travel route (route 1) output to the display 66 is performed.

  When the temperature integrated value tmadd is larger than the predetermined temperature tmref in step S270, the value of the another route re-search determination flag F2 is checked (step S280). Considering when route 1 is extracted in step S230, another route is not re-searched yet, so another route re-search determination flag F2 is 0, and a value 1 is set in the temperature rise prediction determination flag F2. (Step S290) and the current travel section is stored (step S300). Then, it is determined whether or not there is a next travel section (step S310). When it is determined that there is a next travel section, the process returns to step S240, and when it is determined that there is no next travel section, another route is restarted. The value of the search determination flag F2 is checked (step S320). When the another route re-search determination flag F2 is 0, the value of the temperature rise prediction determination flag F1 is checked (step S330). Considering that there is a travel section in which the temperature integrated value tmadd exceeds the threshold value tmadd for the route 1, the temperature rise prediction determination flag F1 is a value 1, so that the map information 63 is used to go from the current position to the destination. Another travel route (hereinafter referred to as route 2) is searched again (step S340), and when it is determined that there is another travel route (route 2) (step S350), another route re-search determination is performed. A value 1 is set to the flag F2 (step S360), and the process returns to step 230.

  Then, a travel route (route 2) from the current position of the vehicle to the destination is extracted (step S230), and a temperature integrated value tmadd obtained by integrating the rising temperature Δtm based on the road surface gradient θ and the vehicle weight M in the next travel section. Is compared with a predetermined temperature tmref (steps S240 to S270), and when the temperature integrated value tmadd is less than the threshold value tmref, it is determined whether or not there is a next travel section (step S310), and it is determined that there is a next travel section. When it is determined, the process returns to step S240, and when it is determined that there is no next travel section, the value of another route re-search determination flag F2 is checked (step S320), and the value 1 is set to the other route re-search determination flag F2. The travel section stored in step S300, that is, the travel where the temperature integrated value tmadd exceeds the predetermined temperature tmref is considered. Route 1 is output to the display 66 and route 2 is output to the display 66 so that the row section is displayed in a display method (for example, blinking display) different from the display method (for example, lighting display) of other travel sections. (Step S380), the route output routine is terminated. Now, for example, consider a case where the operator has selected a distance priority condition. At this time, route 1 is a travel route that is predicted to have a travel section in which the motor temperature tm exceeds the predetermined temperature tmref before the vehicle reaches the destination although the travel distance is shortest, and route 2 is more than route 1 Although the travel distance is long, the travel route is predicted to have no travel section in which the motor temperature tm exceeds the predetermined temperature tmref. Therefore, by outputting both routes to the display 66, the operator can move from the motor 22 by the torque limit Tmax2 of the motor 22 with respect to the temperature rise of the motor 22 until reaching the destination although the travel distance is shortest. Route 1 where the output may be greatly limited (vehicle speed V is limited), and Route 2 where the travel distance is longer than that of Route 1 but the output from the motor 22 is less likely to be greatly limited by the torque limit Tmax2. You can select and drive. Thereby, the convenience of the operator can be further improved. In addition, for the route 1, if the travel section in which the temperature integrated value tmadd exceeds the predetermined temperature tmref is output to the display 66 by a display method different from the display method of other travel sections, the travel section is displayed to the driver. Can be recognized. When route 1 or route 2 is selected by the operator in a state where route 1 and route 2 are output in this way, the selected route is output to the display 66 to perform route guidance. When route 1 or route 2 is not selected by the operator, both route 1 and route 2 may be continuously output to the display 66.

  If the integrated temperature value tmadd is greater than or equal to the threshold value tmref in step S270, the value of the another route re-search determination flag F2 is checked (step S280), and it is considered that the other route re-search determination flag F2 is a value of 1. The process after S340 is executed. In this case, another travel route that has been searched again is updated as route 2 and the same processing is performed. In this way, the travel route (route 2) in which the peak of the temperature integrated value tmadd is equal to or lower than the predetermined temperature tmref is searched again. As a result of searching for another travel route in step S340, if it is determined in step S350 that there is no other travel route (route 2), the travel section stored in step S300, that is, the temperature integrated value tmadd, is the predetermined temperature tmref. The route 1 is output to the display 66 so that the travel section exceeding the distance is displayed with a display method (for example, blinking display) different from the display method (for example, lighting display) of the other travel sections ( Step S390), the route output routine is terminated. Then, route guidance for the travel route (route 1) output to the display 66 is performed.

  FIG. 6 is an explanatory diagram showing an example of a change in the temperature integrated value tmadd (motor temperature tm) calculated based on the road surface gradient θ and the vehicle weight M in each travel section from the current position of the vehicle to the destination. It is. In the figure, a circle indicates a destination. The solid line shows the change in the temperature integration point tmadd for the route 1, and the broken line shows the change in the temperature integration point tmadd for the route 2. When the destination is set by the operator, the route 1 is searched as a travel route from the current position of the vehicle to the destination, and the searched route 1 is extracted (steps S200 and S230), and each travel in the extracted route 1 is performed. A temperature integrated value tmadd is calculated by setting the rising temperature Δtm for the section based on the road surface gradient θ and the vehicle weight M and sequentially integrating the temperature from the current position to the destination (steps S240 to S260). In the example of FIG. 6, since the temperature integrated value tmadd exceeds the predetermined temperature tmref in the travel section x to the travel section (x + i) of the route 1, the temperature integrated value tmadd is sequentially calculated from the route 1 to the destination. By re-searching route 2 as another route up to and extracting re-searched route 2 (steps S340 and S230), as in route 1, the accumulated temperature Δtm is sequentially accumulated from the current position to the destination. The temperature integrated value tmadd is calculated (steps S240 to S260). If the temperature integrated value tmadd from the current position to the destination with respect to the route 2 does not exceed the predetermined temperature tmref, that is, the temperature integrated value tmadd of the route 2 is calculated. If the peak is below the predetermined temperature tmref, both route 1 and route 2 are output to the display 66 (steps). Flop S380). At this time, with respect to route 1, the travel section x to the travel section (x + i) are displayed by a display method different from the display method (for example, lighting display) of other travel sections such as blinking display. An example of the display content displayed on the display 66 at this time is shown in FIG. In the figure, the circle indicates the destination set by the operator, and the square indicates the current position of the vehicle. Also, in the figure, the solid line and dotted line path ABCDE is route 1, and the alternate long and short dash line path ABCFG is route 2. Note that the dotted travel path BC in the route 1 is a travel section in which the temperature integrated value tmadd exceeds the predetermined temperature tmref. When either one of the route 1 and the route 2 is selected by the operator while the route 1 and the route 2 are both displayed on the display 66 as described above, only the selected route is displayed.

  According to the electric vehicle 20 of the embodiment described above, when the destination is set, the travel route from the current position to the destination is searched using the map information 63 according to a predetermined condition, and the road surface gradient θ and the vehicle weight are determined. Based on M, there is a travel section where the motor temperature tm rises above the predetermined temperature tmref before the vehicle reaches the destination on the travel route, that is, the motor temperature tm rises above the predetermined temperature tmref Therefore, this prediction can be predicted more appropriately than that predicted based only on the road surface gradient θ.

  In addition, according to the electric vehicle 20 of the embodiment, the vehicle with respect to the travel route (route 1) from the current position of the vehicle to the destination searched according to the predetermined condition based on the map information when the destination is set. When it is predicted that the motor temperature tm will exceed the predetermined temperature tmref before the vehicle reaches the destination, the travel route (route) where the motor temperature tm is predicted not to exceed the predetermined temperature tmref until the vehicle reaches the destination. 2) is searched again, and both route 1 and route 2 are output to the display 66. Therefore, the operator can select between route 1 and route 2, and the convenience of the operator can be improved. . In addition, in this case, for the route 1, the traveling section in which the motor temperature tm is predicted to exceed the predetermined temperature tmref is output to the display 66 by a display method different from other traveling sections, thereby driving the traveling section. Can be recognized.

  In the electric vehicle 20 of the embodiment, when the destination is set, the vehicle is set to the destination with respect to the travel route (route 1) from the current position of the vehicle to the destination searched according to the predetermined condition based on the map information. When it is predicted that the motor temperature tm will exceed the predetermined temperature tmref before reaching, the travel route (route 2) where the motor temperature tm is predicted not to exceed the predetermined temperature tmref until the vehicle reaches the destination is restarted. The search is performed, but the search may not be performed again. In this case, with respect to the route 1, if the traveling section in which the motor temperature tm is predicted to exceed the predetermined temperature tmref is output to the display 66 by a display method different from other traveling sections, the traveling section is displayed to the driver. Thus, the driver can be given a room for selecting whether or not to travel while avoiding the travel section.

  In the electric vehicle 20 of the embodiment, it is assumed that the prediction as to whether the motor temperature tm rises above the predetermined temperature tmref before the vehicle reaches the destination is made only when the destination is set. It may be repeated every predetermined timing, for example, every predetermined time (for example, every several hundred msec) or every time the vehicle stops while the destination is set.

  In the electric vehicle 20 according to the embodiment, the motor temperature tm (temperature integrated value tmadd) until the vehicle reaches the destination based on the road surface gradient θ and the vehicle weight M in each travel section from the current position of the vehicle to the destination. However, instead of the motor temperature tm, the temperature of the inverter 24 or the temperature of the cooling water that cools the motor 22 or the inverter 24 is used for the prediction. Also good.

  In the electric vehicle 20 of the embodiment, the temperature integrated value tm is calculated using the rising temperature Δtm based on the road surface gradient θ and the vehicle weight M. However, the rising temperature Δtm is calculated based on the road surface gradient θ and the vehicle weight M. In addition or in addition to the vehicle weight M, it may be set in consideration of the distance of the travel section, regional information (city area, suburb), type information (general road, highway), traffic jam information, and the like.

  In the electric vehicle 20 according to the embodiment, when it is predicted that the motor temperature tm rises above the predetermined temperature tmref before the vehicle reaches the destination on the route 1, the motor temperature tm for the route 1 is the predetermined temperature tmref. The driving section predicted to exceed the road is output to the display 66 by a display method different from that of the other driving sections. However, if the driving section can be recognized by the driver, the voice may be used. It is good also as what notifies a driver.

  In the embodiment, the electric vehicle 20 including the motor 22 that can input and output power to the drive shaft 32 and the battery 26 that exchanges electric power with the motor 22 has been described, but in addition to the motor 22 and the battery 26, FIG. As exemplified in the electric vehicle 120 of the modified example, it may be applied to the electric vehicle 120 in which the engine 122 and the motor 124 are connected to the drive shaft 32 via the planetary gear mechanism 126, or the modified example of FIG. As illustrated in the electric vehicle 220, the engine includes an engine 222, an inner rotor 232 connected to the crankshaft of the engine 222, and an outer rotor 234 connected to the drive shaft 32 connected to the drive wheels 30a and 30b. A counter-rotor motor 230 that transmits a part of the power of the engine 222 to the drive shaft 32 and converts the remaining power into electric power; It may alternatively be applied to an electric vehicle 220 equipped. Moreover, although the Example demonstrated the electric vehicle 20 which can drive | work with the motive power from the motor 22 as a motive power source, you may apply to the motor vehicle which can drive | work with the motive power from the internal combustion engine as a motive power source.

  In the embodiment, the description has been given of the automobile that can travel using the power from the power source such as the internal combustion engine and the electric motor and includes the route guidance system. However, the route mounted on the vehicle that can travel using the power from the power source. It may be used as a form of a guidance system.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

It is a block diagram which shows the outline of a structure of the electric vehicle 20 as one Example of this invention. It is a flowchart which shows an example of the drive control routine performed by the electronic control unit 40 of an Example. It is a flowchart which shows an example of a route output routine. It is explanatory drawing which shows an example of the map for request | requirement torque setting. It is explanatory drawing which shows an example of the map for a raise temperature setting. It is explanatory drawing which shows an example of the mode of the change of the temperature integrated value tmadd (motor temperature tm) calculated based on the road surface gradient (theta) and vehicle weight M of each driving | running | working area from the present position of a vehicle to the destination. It is explanatory drawing which shows an example of the display content displayed on the display. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 220 of a modified example.

Explanation of symbols

  20 Electric vehicle, 22 Motor, 22a Temperature sensor, 23 Speed sensor, 24 Inverter, 26 Battery, 26a Temperature sensor, 30a, 30b Drive wheel, 31 Differential gear, 32 Drive shaft, 40 Electronic control unit, 42 CPU, 44 ROM , 46 RAM, 51 shift lever, 52 shift position sensor, 53 accelerator pedal, 54 accelerator pedal position sensor, 55 brake pedal, 56 brake pedal position sensor, 58 vehicle speed sensor, 59 vehicle weight sensor, 60 navigation system, 61 main body, 63 Map information, 65 GPS antenna, 66 display, 120, 220 hybrid vehicle, 122, 222 engine, 124 motor, 126 planetary gear mechanism, 230 pair rotor motor, 232 inner rotor, 234 outer rotor.

Claims (11)

A temperature rise prediction device that is mounted on a vehicle capable of traveling by power from a power source and predicts whether or not the temperature of a power system including the power source rises above a predetermined temperature,
Map information storage means for storing map information including information about roads;
Current position detecting means for detecting the current position of the vehicle;
Travel path search means for searching for a first travel path as a travel path from the detected current position of the vehicle to the destination according to predetermined conditions using the stored map information when a destination is set; ,
Weight detection means for detecting the weight of the vehicle;
Whether the temperature of the power system rises above the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, and the stored map information and the A temperature rise prediction means for predicting based on the detected vehicle weight ;
A temperature rise prediction apparatus comprising:   2. The temperature rise prediction device according to claim 1, wherein the temperature rise prediction means is a means for making a prediction based on information relating to a road surface gradient in the stored map information and the detected vehicle weight. A route guidance system that provides route guidance for a travel route,
The temperature rise prediction device according to claim 1 or 2,
When it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the set destination on the searched first travel path by the temperature rise prediction means, The temperature rise prediction means predicts that the temperature of the power system will not rise above the predetermined temperature until the vehicle reaches the destination, from the detected current position of the vehicle to the destination. A travel path re-search means for re-searching the second travel path as a travel path using the stored map information;
When it is predicted that the temperature of the power system will not exceed the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, the first travel path is output. When it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, the first travel path And travel path output means for selectively outputting the re-searched second travel path,
Route guidance means for performing route guidance based on the output travel route;
A route guidance system comprising:   The route guidance means performs route guidance of the first travel route when the first travel route is output, and the first guide when the first travel route and the second travel route are output selectably. 4. The route guidance system according to claim 3, wherein the route guidance system is means for performing route guidance on a traveling route selected by an operator from the traveling route and the second traveling route.   The travel path output means includes display means for displaying a travel path to the destination, and the temperature of the power system until the vehicle reaches the set destination on the searched first travel path. Is predicted to rise above the predetermined temperature, the traveling section of the first traveling path where the temperature of the power system is predicted not to exceed the predetermined temperature is displayed in the first display format. The travel section that is displayed on the display means and is predicted to increase the temperature of the power system over the predetermined temperature in the first travel path is displayed in a second display format different from the first display format. 5. The route guidance system according to claim 3, wherein the route guidance system is a means for displaying on the display means and displaying the re-searched second travel route in the first display format. A vehicle capable of traveling by power from a power source,
A route guidance system according to any one of claims 3 to 5,
Temperature detecting means for detecting the temperature of the power system;
Power limiting means for limiting the power output from the power source when the detected temperature is equal to or higher than the predetermined temperature;
A vehicle comprising:   The vehicle according to claim 6, wherein the power source is an electric motor.   The power source is an internal combustion engine and electric power input / output means connected to the internal combustion engine and the axle side to output at least part of the power from the internal combustion engine to the axle side with input / output of electric power and power And a motor capable of inputting and outputting power to the axle side. A temperature rise prediction method for predicting whether or not the temperature of a power system including a power source rises above a predetermined temperature, which is mounted on a vehicle capable of traveling by power from a power source,
(A) When the destination is set, the first travel route is searched as a travel route from the current position of the vehicle to the destination by using predetermined map information including information on the road,
(B) Whether the temperature of the power system rises above the predetermined temperature before the vehicle reaches the set destination on the searched first travel path , the map information and the Predict based on vehicle weight ,
A method for predicting a temperature rise. A route guidance method that is mounted on a vehicle capable of traveling by power from a power source and performs route guidance of a traveling route,
(A) When the destination is set, the first travel route is searched as a travel route from the current position of the vehicle to the destination by using predetermined map information including information on the road,
(B) whether the temperature of the power system including the power source rises above the predetermined temperature before the vehicle reaches the set destination on the first travel path, and the map information. Predicting based on the weight of the vehicle ,
(C) When it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the destination on the first travel path, the vehicle reaches the destination. The second traveling path as the traveling path from the current position of the vehicle to the destination where the temperature of the power system is predicted not to rise above the predetermined temperature is searched again using the map information. ,
(D) When it is predicted that the temperature of the power system will not exceed the predetermined temperature before the vehicle reaches the set destination on the searched first travel path, the first travel is performed. Output the road, and when it is predicted that the temperature of the power system will rise above the predetermined temperature before the vehicle reaches the set destination on the searched first traveling road, 1 road and the re-searched second road are output to be selectable,
(E) A route guidance method for performing route guidance based on the output travel route. A thermal load prediction device that is mounted on a vehicle capable of traveling by power from a power source and predicts a heat load of a power system including the power source,
Map information storage means for storing map information including information about roads;
Current position detecting means for detecting the current position of the vehicle;
Travel path search means for searching for a first travel path as a travel path from the detected current position of the vehicle to the destination according to predetermined conditions using the stored map information when a destination is set; ,
Weight detection means for detecting the weight of the vehicle;
The heat load of the power system until the vehicle reaches the set destination after traveling on the searched first travel path is determined based on the stored map information and the detected vehicle weight. A thermal load predicting means for predicting based on ;
A thermal load prediction apparatus comprising:

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