Charge/discharge control apparatus for hybrid vehicle and control program device therefor

• US 20080262668A1
• Filed: 04/08/2008
• Published: 10/23/2008
• Est. Priority Date: 04/23/2007
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Yamada, Kazunao
• Granted Patent: US 8,229,611 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/46 Series type
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/62 Vehicle position
• CPC Class Codes: B60L 2240/622 by satellite navigation
• CPC Class Codes: B60L 2240/64 Road conditions
• CPC Class Codes: B60L 2240/642 Slope of road
• CPC Class Codes: B60L 2240/645 Type of road
• CPC Class Codes: B60L 2260/54 Energy consumption estimation
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2552/05 Type of road, e.g. motorways, local streets, paved or unpaved roads
• CPC Class Codes: B60W 2552/20 Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
• CPC Class Codes: B60W 2556/50 : of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

A navigation ECU records a charge-possible point through charging position record processing and records the history of traveling conditions near the charge-possible point through learning control processing. If a destination point on an optimum route is the charge-possible point, the navigation ECU determines a continuous section where the EV traveling is possible up to the charge-possible point based on the history through SOC management plan preparation processing, and changes over the HV traveling and the EV traveling according to the determination through in-travel processing.

Claims

1. A charge/discharge control apparatus for a battery of a hybrid vehicle having, as traveling power sources, an internal combustion engine driven by combustion of fuel and an electric motor driven by the battery, the control apparatus comprising:

in-travel control means for changing over a traveling mode of the hybrid vehicle between a first mode and a second mode, the first mode using the internal combustion engine and the electric motor as power sources for driving the hybrid vehicle while allowing the battery to be electrically charged as charging by combustion in which power of the internal combustion engine is utilized, and the second mode mainly using the electric motor as the power source for driving the hybrid vehicle while prohibiting the charging by combustion; and

determination means configured to read out a charge-possible point from a charge-possible point storage medium storing the charge-possible point at which the battery can be electrically charged with electric power from a power source outside of the hybrid vehicle, to calculate an amount of battery power consumption when the second mode is used over a continuous section tracing along an optimum route from a destination point which is the charge-possible point that is read out based on electric power consumption data stored in an electric power consumption data storage medium and indicative of electric power consumption that affects the battery power consumption when traveling a plurality of roads, and to determine a commence point of the continuous section where the second mode is to be used up to the destination point along the optimum route based on the calculated amount of electric power consumption, so that a remaining amount of the battery becomes smaller than a predetermined lower-limit value at the destination point,

wherein the in-travel control means is configured to change the traveling mode of the hybrid vehicle from the first mode over to the second mode at the commence point according to the determination by the determination means.

2. The charge/discharge control apparatus according to claim 1, wherein:

the determination means is configured to calculate the amount of battery power consumption when the second mode is used over a continuous section based on a history recorded in a recording means, and to determine an end point of the continuous section from the start point along the optimum route where the second mode is continuously used based upon the calculated amount of electric power consumption; and

the in-travel control means is configured to change the traveling mode of the hybrid vehicle from the second mode over to the first mode at the end point according to a determination by the determination means, and to maintain the first mode from the end point up to the commence point.

3. The charge/discharge control apparatus according to claim 2, wherein:

the determination means is configured to calculate the amount of battery power consumption by using the electric power consumption data in the electric power consumption data storage medium in only a section from the start point to the end point and a section from the commence point to the destination point on the optimum route.

4. The charge/discharge control apparatus according to claim 1, wherein:

the determination means is configured to calculate the amount of battery power consumption by using the electric power consumption data in the electric power consumption data storage medium in only a section from the commence point to the destination point on the optimum route.

5. The charge/discharge control apparatus according to claim 1, wherein:

the determination means is configured to estimate a change in a remaining amount of the battery when traveling along the optimum route from the commence point up to the destination point based upon the electric power consumption data in the electric power consumption data storage medium; and

the in-travel control means is configured to detect the remaining amount of the battery while traveling on the optimum route from the commence point to the destination point, and to execute an operation of the determination means again if the detected remaining amount is less than the amount estimated by the determination means by more than a reference width.

6. The charge/discharge control apparatus according to claim 1, wherein:

the in-travel control means is configured to calculate, while traveling on the optimum route from the commence point to the destination point, a new optimum route from the present position to the destination point if the hybrid vehicle deviates from the optimum route without any change in the destination point, and to execute an operation of the determination means again for the new optimum route.

7. The charge/discharge control apparatus according to claim 1, wherein:

the charge-possible point storage medium stores another charge-possible point where the battery can be electrically charged with electric power from an external power source; and

the in-travel control means is configured to calculate, in case the destination point is changed while traveling on the optimum route from the commence point to the destination point, a new optimum route from the present position up to the destination point based on that the destination point after being changed is the another charge-possible point, and to execute an operation of the determination means again for the destination point after being changed and for the new optimum route.

8. The charge/discharge control apparatus according to claim 1, further comprising:

recording means configured to record, in the charge-possible point storage medium, a charge-possible point where the battery can be electrically charged upon being supplied with electric power from a power source outside of the hybrid vehicle.

9. The charge/discharge control apparatus according to claim 1, further comprising:

recording means is configured to record, in the electric power consumption data storage medium, a road which the hybrid vehicle has traveled and the history of traveling conditions that affect the consumption of battery power when traveling on the road.

10. The charge/discharge control apparatus according to claim 9, wherein:

the recording means is configured to record the road which the hybrid vehicle has traveled and the history of traveling conditions that affect the consumption of battery power when traveling on the road if the hybrid vehicle is within a reference distance from the charge-possible point, but to record neither the road which the hybrid vehicle has traveled nor the history of traveling conditions that affect the consumption of battery power when traveling on the road if the hybrid vehicle is not within a reference distance from the charge-possible point.

11. A storage device storing therein a control program that is executable to control charge/discharge of a battery of a hybrid vehicle that has, as traveling power sources, an internal combustion engine driven by combustion of fuel and an electric motor driven by the battery, the hybrid vehicle changing over a traveling mode between a first mode and a second mode, the first mode using the internal combustion engine and the electric motor as power sources for driving the hybrid vehicle while allowing the battery to be electrically charged as charging by combustion in which power of the internal combustion engine is utilized, and the second mode mainly using the electric motor as the power source for driving the hybrid vehicle while prohibiting the charging by combustion, the control program including steps of:

reading out a charge-possible point from a charge-possible point storage medium storing the charge-possible point at which the battery can be electrically charged with electric power from a power source outside of the hybrid vehicle;

calculating an amount of battery power consumption when the second mode is used over a continuous section tracing along an optimum route from a destination point which is the charge-possible point that is read out based on electric power consumption data stored in an electric power consumption data storage medium and indicative of electric power consumption that affects the battery power consumption when traveling a plurality of roads; and

determining a commence point of the continuous section where the second mode is to be used up to the destination point along the optimum route based on the calculated amount of electric power consumption, so that a remaining amount of the battery becomes smaller than a predetermined lower-limit value at the destination point,

wherein the traveling mode of the hybrid vehicle is changed from the first mode over to the second mode at the commence point.