JP2006327423A - Vehicular heating control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular heating control device capable of enhancing its heating capacity without degrading the engine efficiency. <P>SOLUTION: When a controller 10 determines that the heating capacity of a heating device 15 to perform the heating by utilizing cooling water of an engine 1 must be enhanced, the output of the engine 1 is increased while controlling the engine 1 to be operated at high efficiency. The heating capacity of the heating device 15 can be enhanced by raising the temperature of engine cooling water without degrading the efficiency of the engine 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle heating control device that heats the interior of a vehicle using engine coolant.

  Conventionally, in a hybrid vehicle that suppresses fuel consumption of the engine by driving the electric motor auxiliary during driving of the vehicle and operating the engine at the highest efficiency point, when the heating capacity in the vehicle needs to be improved, A control device that changes the operating point of an engine is known (see Patent Document 1).

JP-A-10-203145

  However, in the conventional control device, in order to improve the heating capacity in the vehicle, the engine is operated at an operating point deviating from the maximum efficiency point while maintaining the output of the engine. Arise.

  The vehicle heating control device according to the present invention is a device that heats the interior of the vehicle using engine coolant, and controls the engine to operate with high efficiency when it is determined that the heating capacity needs to be improved. However, the engine output is increased.

  According to the vehicle heating control apparatus of the present invention, when it is determined that the heating capacity needs to be improved, the engine output is increased while controlling the engine to operate with high efficiency, so that the engine efficiency is decreased. Without being able to improve the heating capacity.

  Hereinafter, an example in which the vehicle heating control device according to the embodiment is applied to a hybrid vehicle will be described. FIG. 1 is an overall configuration diagram of a hybrid vehicle equipped with a vehicle heating control apparatus according to an embodiment. This hybrid vehicle includes an engine 1 and a motor generator 2 as a vehicle driving source of the vehicle, and at least one of the engine 1 and the motor generator 2 is driven by the left and right drive wheels via the transmission 4. It is transmitted to 7a and 7b and travels.

  Electric power is supplied from the battery 6 to the motor generator 2 via the inverter 5. The motor generator 2 can generate electric power by performing a regenerative operation when the vehicle is decelerated. The motor generator 3 is connected to the engine 1 and functions as a generator using the engine 1 as a power source, and also functions as a starting motor for starting the engine 1. The electric power generated by the motor generator 2 and the motor generator 3 is supplied to the battery 6 via the inverter 5.

  The vehicle interior temperature sensor 11 detects the temperature Tin in the vehicle interior. The outside air temperature sensor 12 detects the temperature Tamb outside the passenger compartment. The coolant temperature sensor 13 detects the temperature Tw of the engine coolant. The temperatures detected by the sensors 11 to 13 are transmitted to the controller 10.

  The heating device 15 heats the interior of the vehicle using engine coolant. That is, the engine cooling water heated by the engine 1 is supplied to the heater core, and heat is exchanged between the air blown into the vehicle and the heater core, thereby blowing warm wind into the vehicle.

  The controller 10 sets the target torque and target speed of the engine 1 and sets the torque command value of the motor generator 2 based on the output power required for the vehicle. A memory (not shown) of the controller 10 stores a high-efficiency operating point map that defines operating points for operating the engine 1 in a highly efficient state. FIG. 2 is a diagram illustrating an example of a high efficiency operating point map. The horizontal axis indicates the target rotational speed of the engine 1, and the vertical axis indicates the target output torque of the engine 1. For example, the high efficiency operating point corresponding to the output power P1 of the engine 1 is A1, the target rotational speed is N1, the target torque is T1, and the engine heat dissipation is Q1. The high efficiency operating point corresponding to the output power P2 is A2, the target rotational speed is N1, the target torque is T2, and the engine heat dissipation is Q2. The efficiency of the engine 1 increases as the operating point of the engine 1 moves in the direction of the arrow Y1 in FIG. Further, the heat dissipation amount of the engine 1 increases as the operating point of the engine 1 moves in the direction of the arrow Y2 in FIG.

  In the vehicle heating control apparatus according to the embodiment, when it is determined that the heating capacity of the heating apparatus 15 needs to be improved, the output of the engine 1 is increased while controlling the engine 1 to operate at a high efficiency operating point. Let By increasing the output of the engine 1, the heat dissipation amount of the engine 1 is increased and the temperature of the engine cooling water is increased, so that the heating capacity of the heating device 15 can be improved.

  FIG. 3 is a flowchart showing the contents of processing performed by the vehicle heating control apparatus according to the embodiment. When the user operates the switch of the heating device 15 to turn on the heating, the controller 10 starts the process of step S10. The process of step S10-step S30 is a process which determines whether the heating capability of the heating apparatus 15 needs to be improved.

  In step S <b> 10, it is determined whether or not the vehicle interior temperature Tin detected by the vehicle interior temperature sensor 11 is lower than the temperature Tset set in the heating device 15. The temperature Tset can be set by the user. If it is determined that the vehicle interior temperature Tin detected by the vehicle interior temperature sensor 11 is equal to or higher than the set temperature Tset, the process proceeds to step S70. If it is determined that the temperature is lower than the set temperature Tset, the process proceeds to step S20.

  In step S20, it is determined whether or not the temperature Tamb outside the passenger compartment detected by the outside air temperature sensor 12 is lower than a predetermined temperature T1 (for example, 0 ° C.). If it is determined that the temperature Tamb outside the passenger compartment detected by the outside air temperature sensor 12 is equal to or higher than the predetermined temperature T1, the process proceeds to step S70. If it is determined that the temperature Tamb is lower than the predetermined temperature T1, the process proceeds to step S30.

  In step S30, it is determined whether or not the temperature Tw of the engine coolant detected by the coolant temperature sensor 13 is lower than a predetermined temperature T2 (for example, 70 ° C.). If it is determined that the temperature Tw of the engine coolant detected by the coolant temperature sensor 13 is equal to or higher than the predetermined temperature T2, the process proceeds to step S70, and if it is determined that the temperature is lower than the predetermined temperature T2, the process proceeds to step S40.

  In step S40, the target SOC (State Of Charge) of the battery 6 is increased to a predetermined SOC (for example, 70%). When the target SOC of the battery 6 increases, the motor generator 3 generates power and charges the battery, so that the output of the engine 1 increases. Here, the output of the engine 1 is increased while the state in which the engine is operated at the high efficiency operating point is continued.

  For example, when the operating point of the engine 1 before raising the target SOC of the battery 6 is the target rotational speed N1, the target torque T1, and the operating point A1 of the heat radiation amount Q1 from the engine 1, high-efficiency operation is performed. The operating point is changed to an operating point A2 that is an operating point on the point map and that increases the output of the engine 1. As a result, the output of engine 1 increases from P1 to P2 and the amount of power generated by motor generator 3 increases, so that the SOC of battery 6 can be increased. Further, since the operating point of the engine 1 is changed on the high-efficiency operating point map, the engine efficiency is not deteriorated. The operating point of the engine 1 after increasing the target SOC of the battery 6 depends on the engine output to be increased based on the power generation amount necessary for charging the battery 6 on the high-efficiency operating point map. Determined.

In step S50 following step S40, it is determined whether a condition for returning the target SOC of the battery 6 to the target SOC before the increase is satisfied. Here, when any one of the following conditions (1) to (5) is satisfied, it is determined that the condition for returning the target SOC of the battery 6 to the target SOC before the increase is satisfied.
(1) The temperature Tin in the passenger compartment becomes equal to or higher than the set temperature Tset (2) The temperature Tamb outside the passenger compartment becomes equal to or higher than the predetermined temperature T1 (3) The temperature Tw of engine cooling water becomes equal to or higher than the predetermined temperature T2 (4) Battery 6 SOC reaches a predetermined SOC (for example, 70%) (5) The heating device 15 is turned off.

  If it is determined that any one of the above conditions (1) to (5) is satisfied, the process proceeds to step S60, and if any of the conditions (1) to (5) is determined to be not satisfied, Wait in step S50. In step S60, the target SOC of the battery 6 is returned to the target SOC before the increase, and the process returns to step S10.

  On the other hand, in step S70, the target SOC of the battery 6 remains the target SOC during normal control. That is, when the temperature Tin in the vehicle interior is equal to or higher than the set temperature Tset, the temperature Tamb outside the vehicle interior is equal to or higher than the predetermined temperature T1, or the temperature Tw of the engine cooling water is equal to or higher than the predetermined temperature T2. Even if the temperature of the cooling water is not increased, it is determined that sufficient heating can be performed by the heating device 15, and the target SOC of the battery 6 remains the target SOC during normal control.

  When the vehicle heating control device in one embodiment determines that it is necessary to improve the capacity of the heating device in a system that heats the interior of the vehicle using engine coolant, the engine 1 is at a high-efficiency operating point. While controlling to operate, the output of the engine 1 is increased. By increasing the output of the engine 1, the heat dissipation amount of the engine 1 is increased and the temperature of the cooling water of the engine is increased, so that the heating capacity can be improved. In addition, when the output of the engine 1 is increased, the operating point of the engine 1 is changed so that the engine 1 operates at a high-efficiency operating point, so that deterioration of the efficiency of the engine 1 can be suppressed. Furthermore, since the existing high-efficiency operating point map is used in the control for improving the heating capacity, it is not necessary to newly introduce a high-efficiency operating point map for heating control.

  In the vehicle heating control apparatus according to the embodiment, when it is determined that the capacity of the heating apparatus needs to be improved, the target SOC of the battery 6 is increased. That is, the output of the engine 1 is increased in order to increase the power generation amount of the motor generator 3 functioning as a generator by increasing the target SOC of the battery 6. Thereby, since the increase in the output of the engine 1 is used to increase the amount of power generated by the motor generator 3, it is possible to prevent the vehicle behavior from being affected by the increase in the output of the engine 1.

  In the vehicle heating control apparatus according to the embodiment, the temperature Tin in the passenger compartment is lower than the set temperature Tset, the temperature Tamb outside the passenger compartment is lower than the predetermined temperature T1, and the temperature Tw of the engine coolant is lower than the predetermined temperature T2. In this case, it is determined that the heating capacity of the heating device 15 needs to be improved. Thereby, it is possible to accurately determine whether or not the heating capacity needs to be improved, and thus it is possible to prevent the output of the engine 1 from increasing until it is not necessary to improve the heating capacity.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, an example in which the vehicle heating control device is applied to a hybrid vehicle has been described. However, the embodiment can also be applied to a gasoline vehicle using an engine as a travel drive source. However, it is preferable to employ a method that does not affect the vehicle behavior when the engine output increases.

  Further, when it is determined that the heating capacity needs to be improved, the target SOC of the battery 6 is increased, thereby increasing the output of the engine 1 and increasing the engine cooling water. The output of the engine 1 may be increased by a method other than the method of increasing the target SOC. However, it is preferable to adopt a method that does not affect the vehicle behavior when the output of the engine 1 increases.

  An example of the high-efficiency operating point map for operating the engine 1 with high efficiency has been described with reference to FIG. 2, but the high-efficiency operating point map is not limited to that shown in FIG. What is necessary is just to define an operating point for operating efficiently.

  In the embodiment described above, heating is performed when the temperature Tin in the vehicle interior is lower than the set temperature Tset, the temperature Tamb outside the vehicle interior is lower than the predetermined temperature T1, and the temperature Tw of the engine coolant is lower than the predetermined temperature T2. It was determined that the heating capacity of the device 15 needs to be improved. However, when the temperature Tw of the engine cooling water is lower than the predetermined temperature T2, it may be determined that the heating capacity needs to be improved, the temperature Tamb outside the passenger compartment is lower than the predetermined temperature T1, and the engine cooling water When the temperature Tw is lower than the predetermined temperature T2, it may be determined that the heating capacity needs to be improved. Moreover, it can also be judged whether it is necessary to improve the heating capability of the heating apparatus 15 based on another parameter.

  Note that the present invention is not limited to the configurations in the above-described embodiments as long as the characteristic functions of the present invention are not impaired.

  The correspondence between the constituent elements of the claims and the constituent elements of the embodiment is as follows. That is, the controller 10 constitutes determination means and engine control means, the in-vehicle temperature sensor 11 constitutes in-vehicle temperature detection means, the outside air temperature sensor 12 constitutes outside air temperature detection means, and the cooling water temperature sensor 13 constitutes cooling water temperature detection means. In addition, the above description is an example to the last, and when interpreting invention, it is not limited to the correspondence of the component of said embodiment and the component of this invention at all.

1 is an overall configuration diagram of a hybrid vehicle equipped with a vehicle heating control device according to an embodiment. Diagram showing an example of a high-efficiency operating point map The flowchart which shows the processing content performed with the heating control apparatus for vehicles in one embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Motor generator, 3 ... Motor generator, 4 ... Transmission, 5 ... Inverter, 6 ... Battery, 7a, 7b ... Wheel, 10 ... Controller, 11 ... Inside temperature sensor, 12 ... Outside temperature sensor, 13 ... Cooling water temperature sensor, 15 ... heating device

Claims (6)

In a vehicle heating control device that heats the interior of a vehicle using engine coolant,
Determination means for determining whether or not the heating capacity needs to be improved;
When the determination means determines that the heating capacity needs to be improved, the vehicle includes engine control means for increasing the output of the engine while controlling the engine to operate with high efficiency. Heating control device. The vehicle heating control device according to claim 1,
A storage means for storing a high-efficiency operating point for operating the engine with high efficiency;
When it is determined by the determination means that the heating capacity needs to be improved, the engine control means controls the engine to operate at a high efficiency operating point stored in the storage means. A heating control apparatus for a vehicle characterized by increasing an output. In the heating control apparatus for vehicles according to claim 1 or 2,
This vehicle heating control device is provided and used in a hybrid vehicle including an engine and a motor as a driving drive source of the vehicle,
When it is determined by the determining means that the heating capacity needs to be improved, the determining means further comprises target charging rate changing means for increasing the target charging rate of the battery,
When the target charging rate of the battery is increased by the target charging rate changing unit, the engine control unit increases the power generation amount of the power generation unit that generates power using the engine as a power source to increase the charging rate of the battery. A heating control apparatus for a vehicle, wherein the output of the engine is increased. In the heating control apparatus for vehicles in any one of Claims 1-3,
A cooling water temperature detecting means for detecting the temperature of the engine cooling water;
The vehicle heating control apparatus according to claim 1, wherein the determination unit determines that the heating capacity needs to be improved when the cooling water temperature detected by the cooling water temperature detection unit is lower than a predetermined water temperature. In the heating control apparatus for vehicles in any one of Claims 1-3,
Cooling water temperature detecting means for detecting the temperature of the engine cooling water;
An outside air temperature detecting means for detecting the temperature outside the passenger compartment,
The determining means improves heating capacity when the outside air temperature detected by the outside air temperature detecting means is lower than a predetermined temperature and the cooling water temperature detected by the cooling water temperature detecting means is lower than a predetermined water temperature. A vehicle heating control apparatus characterized by determining that it is necessary. In the heating control apparatus for vehicles in any one of Claims 1-3,
Cooling water temperature detecting means for detecting the temperature of the engine cooling water;
An outside air temperature detecting means for detecting the temperature outside the passenger compartment;
A vehicle interior temperature detecting means for detecting the temperature in the vehicle interior;
The determination means has an in-vehicle temperature detected by the in-vehicle temperature detecting means lower than a first predetermined temperature, an outside air temperature detected by the outside air temperature detecting means is lower than a second predetermined temperature, and the cooling water temperature. A vehicle heating control device that determines that the heating capacity needs to be improved when the cooling water temperature detected by the detecting means is lower than a predetermined water temperature.

Images