JPH10271698A - Vehicle power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle power supply device by which the power consumption of a battery while a vehicle is not in operation can be minimized. SOLUTION: A vehicle power supply device has a battery 1, a load driving power supply line 6 which supplies a power to a load through a relay switching circuit 24 and a control electric circuit driving power supply line 7 which supplies a power to a control circuit through an IPS 23. The control unit 20 of a main power supply distributor 2 is supplied with a power by the battery 1 consistently and always can operate. On the other hand, the control units 30 and 40 of sub power supply distributors 3 and 4 are supplied with a power when the IPS 23 is in an on-state only. When a vehicle is not in operation or not in motion, the control unit 20 turns off the relay switching circuit 24 to discontinue the power supply to the load completely. Therefore, even if a head light lighting switch 132 is left closed, a head light 102 is extinguished automatically after a certain lapse of time. Further, in the case of long term storage, the control unit 20 turns off the IPS 23 to stop the power supply to the control units 30 and 40. Moreover, a normal mode can be restored quickly without inharmonious feeling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a vehicle for supplying power to various electric components, devices, and devices mounted on a vehicle such as a passenger car.
The present invention relates to a power supply device for a vehicle that reduces power consumption of a battery when the vehicle is stopped.

[0002]

2. Description of the Related Art When a vehicle such as a passenger car is stopped or is not operating, for example, it is possible to display an alarm by displaying a half door, but a driver does not notice the alarm.
If left for a long time, the life of the battery may be exhausted. Further, when the headlights and the room lights are forgotten to be turned off for a long time when the vehicle is not operating, the life of the battery may be exhausted. In addition, there are various factors that consume the power of the battery even when the vehicle is not operating.

In addition, there is a factor that the power of the battery is consumed while the vehicle is stopped or not operating, even if the operation is not forgotten as in the above-described example. A typical example is power supply to an electronic control system that can be always started to start a vehicle. The electronic control unit that occupies the core of the electronic control system usually includes a microcomputer and the like.When the vehicle is not operating or stopped, the power consumption of the microcomputer and the like is minimized.
In many cases, the computer is in the sleep mode. However, even in the sleep mode, if the number of electronic control units using the microcomputer is large, the power consumption is still the same.

[0004] When the vehicle is stored for a long period of time, when exported overseas by sea, when transported from an exporting country to an importing country for a long period of time, or when the vehicle is left unattended for a long period of time, the sleep mode is set. The accumulation of dark current in the mode can also significantly reduce the life of the battery or even exhaust the life of the battery.

[0005] In particular, since recent vehicles are being digitized, many electronic devices are mounted on the vehicles, and battery consumption tends to be accelerated. However, since the capacity of the battery is limited, the above problem cannot be sufficiently overcome.

[0006]

There are various approaches to reduce the power consumption of the battery in order to extend the life of the battery. For example, regarding the above-mentioned forgetting to turn off the room light, the vehicle monitors the state, and after a predetermined period of time after the vehicle is not operating or stopped, a room light that has been forgotten to be automatically turned off after a predetermined period of time. A method of stopping the power supply to all the electric systems that do not operate may be considered. However, since the electronic control system that monitors the state of the vehicle operates constantly, the power supply to the electronic control system consumes the power of the battery as a dark current. Even when the electronic control system is in the sleep mode, there are many electronic control circuits, and the power consumption of the battery becomes considerable when the non-operation period is long.

If the vehicle is not used for a long period of time such as during long-term storage or overseas transportation, the fuse on the output side of the battery may be disconnected. Indeed, if the fuse is removed, the power supply to all the electric systems of the vehicle will be completely eliminated, and only the battery voltage will be reduced due to the natural discharge over a long period of time. However, it is troublesome to remove the fuse when the vehicle is not used for a long period of time, or to insert the fuse when the vehicle is in use, and there is a possibility that the worker may come into contact with the power supply line of the battery. Is in danger.

In the conventional power supply system, a power supply system to a load such as a room light and a headlight and a power supply system to an electronic control system are not clearly distinguished. Therefore, there is an aspect that the above-described measures for reducing power consumption when the vehicle is stopped cannot be effectively performed.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems and, in particular, to provide a vehicle power supply apparatus that minimizes power consumption when the vehicle is stopped and not in use.

[0010]

According to the present invention, a power supply system includes:
The system is clearly divided into a load power supply system and a power supply system to an electric system such as a control circuit. Next, for power supply to an electric system such as a control circuit, power is supplied for a predetermined time during non-operation or when the vehicle is stopped, and power is supplied to a predetermined electronic control unit without any trouble during a non-operation period considered in a normal use mode of a vehicle. However, if the non-operating state lasts for a long time, power is supplied only to some electronic control units, and power supply to other electronic control units and all loads is completely cut off to minimize battery consumption. Based on the concept.

Therefore, according to the present invention, a battery mounted on a vehicle, main control circuit means directly connected to the battery, first switch means connected to the battery, and the first switch A load power supply line connected to the means for supplying power to a load mounted on the vehicle; a second switch means connected to the battery;
And a control circuit power supply line for a control circuit that controls the load, and a slave control circuit means connected to the control circuit power supply line, wherein the main control circuit means
In the first state, the first switching means and the second switching means are energized so that power from the battery is supplied to the load power supply line and the control circuit power supply line, and After the deactivation of the two first mode switching signals, if the first mode switching signal is not applied within the first predetermined time and the second mode switching SW is not changed, the main control circuit means Deactivating the first switching means to stop power supply to the load power supply line, and setting the second state in the second state.
After a lapse of a predetermined time, a power supply device for a vehicle is provided in which the main control circuit means deactivates the second switching means and enters a third state in which power supply to the load power supply line is stopped.

Preferably, the apparatus further comprises third switching means connected to the load power supply line for switching power supply to each load, and wherein the third control means is provided by the main control circuit means and the slave control circuit means. To drive a corresponding load. Specifically, the first
The mode switching signal includes an ignition key switch signal of the vehicle or a door lock signal.

Preferably, in the second state,
In response to a change in the first mode switching signal or a change in the second mode signal, the main control circuit returns the vehicle power supply device to the first state. Specifically, the second mode switching signal includes a vehicle room lamp lighting switch signal, a door opening / closing switch signal, or a headlight lighting switch signal.

More preferably, in the third state, the main control circuit returns the vehicle power supply device to the first state in response to a change in a third mode switching signal. Specifically, the third mode switching signal includes an ignition key switch signal.

[0015] Preferably, the first switching means includes a relay switch circuit, and the second switching means includes a semiconductor switching element.

More preferably, the main control circuit means includes:
It has a microcomputer and a sleep mode that minimizes power consumption when stopped.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle power supply device according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a vehicle power supply device according to a first embodiment of the present invention. 1 includes a battery 1, a main power distribution device 2 arranged near the battery 1, a sub power distribution device 3 and a sub power distribution device supplied with power via the main power distribution device 2. 4 The main power distribution device 2 is disposed near the battery 1, the sub power distribution device 3 is disposed near the operation switch, and the sub power distribution device 4 is disposed near a specific load. The number of slave power distribution devices is not limited to the two illustrated ones, and they are arranged as necessary. In this embodiment, however, two slave power distribution devices are shown for simplification of the illustration. Also, there are various types of hazard lamps 101 and the like as illustrated as loads, but in the present embodiment, only representative examples are shown for illustrative purposes.

The main power distribution device 2 includes a control unit 20,
It has a signal multiplex transmission unit 21, a signal input unit 22, an intelligent power switch (IPS) 23 whose circuit configuration is shown in FIG. 2, a relay switch circuit 24, and operation switch circuits 25 and 26. Operation switch circuit 2
Hazard lamps 101 and headlights 102 are connected to 5 and 26, respectively. The control unit 20 includes a microcomputer, a memory, and the like, and exchanges information input through the signal input unit 22 with the sub power distribution device 3 and the sub power distribution device 4 through the signal multiplex transmission unit 21. IPS23 based on the result
And the relay switch circuit 24 is controlled. The control operation of the control unit 20 will be described later. Control unit 20, signal multiplex transmission unit 21, signal input unit 2
2 corresponds to the electric circuit of the present invention, and the hazard lamp 101
And the headlight 102 corresponds to the load in the present embodiment.

The slave power distribution device 3 includes a control unit 30,
It has a signal multiplex transmission unit 31, a signal input unit 32, and operation switch circuits 35 to 37. A room lamp 111, a door lock motor 112, and a coil 113 are connected to the operation switch circuits 35 to 37, respectively. The control unit 30 also includes a microcomputer, a memory, and the like, and information exchanged with the main power distribution device 2 and the sub power distribution device 4 through the signal multiplex transmission unit 31 and information input through the signal input unit 32. , The semiconductor switch circuits 35 to 37 are controlled. The control operation of the control unit 30 will be described later. The control unit 30, the signal multiplex transmission unit 31, and the signal input unit 32 correspond to the electric circuit of the present invention, and the room lamp 11
1. The door lock motor 112 and the coil 113 correspond to the load in this embodiment.

The sub power distribution device 4 includes a control unit 40,
A signal multiplex transmission unit 41 and an operation switch circuit 45 are provided. The tail lamp 121 is connected to the operation switch circuit 45. The control unit 40 also includes a microcomputer, a memory, and the like, and the main power distribution device 2 and the sub power distribution device 3 are transmitted via the signal multiplex transmission unit 41.
Based on the result of information exchange with the semiconductor switch circuit 4
5 is performed. The control operation of the control unit 40 will be described later. The control unit 40 and the signal multiplex transmission unit 41 correspond to the electric circuit of the present invention, and the tail lamp 121
Corresponds to the load in this embodiment.

In the power supply line from the battery 1, the power supply line via the relay switch circuit 24 is used as the load drive power supply line 6 and the power supply line via the IPS 23 is used as the control electric circuit drive. Note that the power supply line 7 is used, and the power supply line is divided into two systems. In the present embodiment, the hazard lamp 101 and the headlight 102 that are driven and controlled in the main power distribution device 2, the room lamp 111 that is driven and controlled in the sub power distribution device 3, the door lock motor 112, the coil 113, and the sub power distribution device 4, the tail lamp 121 whose drive is controlled is a load. These loads are provided with a power supply line 6 for driving the load using the relay switch circuit 24 as a power supply line, and these loads are provided with semiconductor switch circuits 25 and 26, semiconductor switch circuits 35 to 37, and a semiconductor switch circuit 45, respectively.
Power is supplied via

On the other hand, in this embodiment, the control unit 20, the signal multiplex transmission unit 21, the signal input unit 22 in the main power distribution device 2, the control unit 30, the signal multiplex transmission unit 31, and the signal input in the sub power distribution device 3 The unit 32, the control unit 40 and the signal multiplex transmission unit 41 in the sub power distribution device 4 correspond to an electric circuit, and these circuits are supplied with power from a control electric circuit driving power supply line 77 via the IPS 23. However, the control unit 20, the signal multiplex transmission unit 21, and the signal input unit 22 in the main power distribution device 2, which are to be operated even when not operating or when the vehicle is stopped, are supplied directly from the battery 1 without passing through the IPS 23. For simplicity of illustration, power supply lines from the battery 1 to the signal multiplex transmission unit 21 and the signal input unit 22 in the main power distribution device 2 are omitted. Similarly, in the slave power distribution device 3, the illustration of the power supply lines to the signal multiplex transmission unit 31 and the signal input unit 32 is omitted.
Power is supplied from the electric circuit driving power supply line 7. In the slave power distribution device 4, the power supply line to the signal multiplexing transmission unit 41 is not shown, but power is supplied from the control electric circuit driving power supply line 7 as in the control unit 40.

The power supply system to the load will be described. The power supply system for the load includes a relay switch circuit 24 for activating and deactivating the load driving power supply line 6, operation switch circuits 25 and 26 for controlling power supply to individual loads, and operation switch circuits 35 to 37. It has a two-stage configuration including an operation switch circuit 45. That is, in this embodiment, when the control unit 20 energizes (turns on) the relay switch circuit 24, power is supplied to the load via the operation switch circuits 25 and 26, the operation switch circuits 35 to 37, and the operation switch circuit 45. However, when the control unit 20 deactivates (turns off) the relay switch circuit 24, power supply to all loads is completely cut off, thereby constituting a power supply circuit. In the present embodiment, the battery 1 and the load driving power line 6
As the first-stage switching means (first switching means) for interrupting the power supply, the power supply to the load is completely interrupted.
Since a substantial current flows through the entire load for connection, a relay switch circuit 24 having a contact C having a large current passing capacity is provided.
Is used. On the other hand, as the second-stage switching means (third switching means) for each load, for example, the hazard lamp 101, each load capacity is not so large, and for example, the load capacity of a semiconductor switch or the like is small. A switching element, for example, a power transistor, a power MOSFET, or the like can be used. Of course, a relay switch similar to the relay switch circuit 24 can be used for the operation switch circuits 25 and 26 and the like.

Next, power supply to the electric circuit will be described. The control unit 20, the signal multiplex transmission unit 21, and the signal input unit 22 are configured to be constantly supplied with power from the battery 1. Of course, when the microcomputer such as the control unit 20 and the memory are not operated, the sleep mode is set and the power consumption is reduced as much as possible. Control unit 3 in slave power distribution device 3
0, signal multiplex transmission unit 31, signal input unit 3
2 and the control unit 4 in the sub power distribution device 4
0, power supply to the signal multiplexing transmission unit 41 is limited to when the control unit 20 turns on the IPS 23 and turns on the control circuit driving power supply line 7. In other words, the electric circuits of the sub power distribution device 3 and the sub power distribution device 4 are also not supplied with power when the IPS 23 is deactivated, so that there is no power consumption in these electric circuits. When the IPS 23 is in the deactivated state,
Since there is no power consumption in the electric circuits in the slave power distribution device 3 and the slave power distribution device 4, the control unit 30,
It is not necessary to use a microcomputer having a sleep mode as the microcomputer such as the control unit 40.

The circuit configuration of the IPS 23 will be described with reference to FIG. The IPS 23 is provided with an input logic for receiving a control signal from the control unit 10 in order to extinguish power supply to the load, in this embodiment, the control unit 30 and the control unit 40 connected to the control electric circuit driving power supply line 7. circuit,
It has an output circuit. The power supply to the control electric circuit driving power supply line 7 is killed by the output of the output circuit. Also, IP
At S23, a protection circuit and a diagnosis circuit are provided.
The protection circuit protects electronic circuits and the like in the IPS 23 from excessive current and excessive voltage. The diagnosis circuit diagnoses the internal circuit state of the IPS 23 in response to a diagnosis request from the control unit 20. For the actual product of the IPS 23, for example, see TPD1004S manufactured by Toshiba.

The signal multiplex transmission unit 21, the signal multiplex transmission unit 31, and the signal multiplex transmission unit 41 can mutually transmit information via the multiplex transmission signal line 8.

The operation of the vehicle power supply device illustrated in FIG. 1 will be described below. First State (Normal State) A state in which the vehicle operates normally is referred to as a first state. In the first state, the relay switch circuit 24 is turned on by the control unit 20, and power can be supplied from the battery 1 to all the loads, for example, the hazard lamp 101, via the load driving power supply line 6. Of course, the IPS 23 is also in the ON state by the control unit 20, and the control unit 30,
The signal multiplex transmission unit 31, the signal input unit 32, the control unit 40, and the signal multiplex transmission unit 41 are powered and operable.

The ignition key switch 131, the headlight lighting switch 132, and the ignition key switch 131 connected to the second state subordinate power distribution device 3
When the hazard instruction switch 133, the operation switch 134, and the like are turned off (closed), the control unit 30 reads these states via the signal input unit 32,
The read state is transmitted to the signal multiplex transmission unit 21 of the main power distribution device 2 via the signal multiplex transmission unit 31 and the multiplex transmission signal line 8 and reported to the control unit 20. Of course, the ignition key switch 131 is connected to the signal input unit 22 of the main power distribution device 2 via the signal input line 9.
, And the control unit 20 directly detects the off state of the ignition key switch 131.
When the control unit 20 has the ignition key switch 131
A predetermined time (first predetermined time) after recognizing the OFF state of
After the lapse of time, if the ignition key switch 131 is kept off, the vehicle is determined to be in an inactive state, the relay switch circuit 24 is deactivated (turned off), and the power supply in the control electric circuit driving power supply line 7 is deactivated. To Therefore, for example, the headlight 102 while the switch 132 for turning on the headlight as the second mode switching signal is kept on.
Even if is lit, it is automatically turned off. The same applies to other loads, and there is no power consumption to the loads. In the second state, the IPS 23 is in an ON state,
Slave power distribution device 3 via power line 7 for driving control electric circuit
Is supplied to the control unit 30 and the like. This unnecessary power consumption cutoff state for the load is referred to as a second state.

Return from the second state to the first state In the second state, for example, when the door is opened or the door lock switch (operation switch 134) is operated within a predetermined time (a second predetermined time). When any operation such as operation is performed, the control unit 30 of the slave power distribution device 3 detects the operation and sends it to the control unit 20 in the system of the signal multiplex transmission unit 31, the multiplex transmission signal line 8, and the signal multiplex transmission unit 21. report. When the control unit 20 receives the above-mentioned operation from the control unit 30, the control unit 20 activates (turns on) the relay switch circuit 24,
Power can be supplied from the load driving power supply line 6 to the load. This returns to the first state. As the second mode switching signal, for example, after the headlamp lighting signal is once turned off and then turned on, the control unit 30 detects a change in the switch and returns to the first state.

Transition from the second state to the third state In the second state, if there is no operation as described above even after a predetermined time (a second predetermined time) has elapsed, the control unit 20 turns off the IPS 23 and turns off the IPS 23. The power line 7 for driving the control electric circuit is disconnected from the battery 1. Thereby, the control unit 30 of the sub power distribution device 3 and the sub power distribution device 4
The power supply to the control unit 40 and the like is cut off. This state is called a third state. In the second state, the load driving power supply line 6 is in an inactive state, there is no power consumption in the load, and in the third state, except for the electric circuit of the main power distribution device 2, the sub power distribution device 3 The power supply to the electric circuit in the sub power distribution device 4 is also cut off. Therefore, there is no power consumption in the electric circuits of the other sub power distribution devices except for the main power distribution device 2. Therefore, even when the vehicle is in a non-operating state for a long period of time such as when exporting overseas, there is no power cost except for the control unit 20 in the main power distribution device 2. Moreover, since the control unit 20 and the like enter the sleep mode, their power consumption is extremely small.

Returning from the third state to the first state When the driver turns on the ignition key switch 131, the control unit 20 detects that the ignition key switch 131 inputted via the signal input line 9 is turned on, and the IPS 23 Is turned on, the sub power distribution device 3 is connected from the battery 1 via the control electric circuit driving power line 7,
The power supply to the sub power distribution device 4 is restarted. Thus, the control unit 30, the control unit 40, and the like can operate. Further, the control unit 20 includes a relay switch circuit 24.
Is turned on to activate the load driving power supply line 6. Thus, the battery 1 can be supplied with power to the load. That is, the state returns to the first state.

As described above, according to the present embodiment, the first to third states (modes) are utilized simply by utilizing the operation of the existing operation switches, and particularly utilizing the operation of the ignition key switch 131. Are defined, and those that can be operated in these states are distinguished from those that are not operated, so that the power consumption of the battery 1 can be optimized according to the states.

The present invention is not limited to the above-described embodiment, but may take various modifications. The conditions of the above-mentioned state transition and the processing contents in each state are not limited to the above-described embodiment, and can be appropriately changed according to the conditions of the vehicle and the like. For example, the transition from the first state to the second state is made after the first predetermined time has elapsed when the ignition key switch 131 is turned off and the door is closed.
The transition to the third state is made after the lapse of the second predetermined time while maintaining the second state. Such a change in the state transition can be easily performed because a microcomputer is used for the control unit 20.

The loads controlled by the main power distribution device 2, the loads controlled by the sub power distribution device 3, the loads controlled by the sub power distribution device 4, and the switches input to the sub power distribution device 3 are shown in FIG. This is an example, and can be arbitrarily changed according to the vehicle.

[0035]

According to the present invention, the power supply system is divided into a load power supply system and a control electric circuit driving power supply system, and the power supply stop to the load and the power supply stop to the control circuit are managed according to the state. Therefore, the power consumption can be optimized according to the situation of the vehicle. In particular, according to the present invention, it is possible to automatically prevent continuation of power supply to a load due to, for example, forgetting to operate. Further, according to the present invention, power consumption in the main control means can be minimized even when the vehicle is not operated for a long period of time. As described above, according to the present invention, the life of the battery can be extended.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle power supply device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of the IPS shown in FIG. 1;

[Explanation of symbols]

 1. Battery 6. Power supply line for driving load 7. Power supply line for driving control electric circuit 8. Multiple transmission signal line 9. Signal input line 2. Main power distribution device 20. Control unit 21 .. Signal multiplex transmission unit 22 Signal input unit 23 IPS 24 Relay switch circuit 25, 26 Operation switch circuit 3 Secondary power distribution device 30 Control unit 31 Signal multiplex transmission unit 32 Signal input unit 35-37..Operation switch circuit 4..Slave power distribution device 40..Control unit 41..Signal multiplex transmission unit 45..Operation switch circuit 101..Hazard lamp 102..Headlight 111..Room Lamp 112 Door lock motor 113 Coil 121 Tail lamp 131 Ignition key switch 132 · · · Headlight lighting switch 133 · · · Hazard instruction switch 134 · · · Operation switch

Claims (9)

[Claims] 1. A battery mounted on a vehicle, a main control circuit directly connected to the battery, a first switch connected to the battery, and a vehicle connected to the first switch. A load power supply line for supplying power to a load mounted on the battery; a second switch means connected to the battery; a control circuit power supply for a control circuit connected to the second switch means for controlling the load. An electric wire, and slave control circuit means connected to the control circuit power supply line, wherein the main control circuit means in the first state,
Energizing the switching means and the second switching means so that power from the battery is supplied to the load power supply line and the control circuit power supply line, and a change in at least one first mode switching signal. Later, the first
When there is no change in the first and second mode switching signals within the predetermined time, the main control circuit deactivates the first switching means and stops supplying power to the load power supply line. And after a lapse of a second predetermined time in the second state, the main control circuit means deactivates the second switching means to stop supplying power to the load power supply line. A power supply device for a vehicle to be in the state of 3. 2. The apparatus according to claim 1, further comprising: third switching means connected to said load power supply line for switching power supply to each load, wherein said third switching means is provided by said main control circuit means and said slave control circuit means. 2. The vehicle power supply device according to claim 1, wherein the control means controls a corresponding load. 3. The vehicle power supply device according to claim 1, wherein the second mode switching signal includes an ignition key switch signal of a vehicle or a door lock signal. 4. In the first state, in response to a change in the first mode switching signal or a change in the second mode signal, the main control circuit means switches the vehicle power supply device to the first state. The vehicle power supply device according to any one of claims 1 to 3, wherein the vehicle power supply device is returned to the power supply. 5. The vehicle power supply device according to claim 4, wherein the second mode switching signal includes a room lamp lighting switch signal, a door opening / closing switch signal, or a headlight lighting switch signal of the vehicle. 6. In the third state, the main control circuit returns the vehicle power supply device to the first state in response to a change in a third mode switching signal.
The vehicle power supply device according to any one of the above. 7. The vehicle power supply device according to claim 6, wherein the third mode switching signal includes an ignition key switch signal. 8. The vehicle power supply device according to claim 1, wherein said first switching means includes a relay switch circuit, and said second switching means includes a semiconductor switching element. 9. The vehicle power supply device according to claim 1, wherein said main control circuit means has a microcomputer and has a sleep mode in which power consumption is minimized when stopped.