Apparatus and method for detecting running resistance of a vehicle

• US 5,974,353 A
• Filed: 01/26/1998
• Issued: 10/26/1999
• Est. Priority Date: 01/27/1997
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Unisia Jecs Corporation (Hitachi, Ltd.)
• Inventors: Sekiguchi, Hideki, Horiguchi, Masanobu
• Primary Examiner(s): Zanelli, Michael J.
• Application Number:
  US09/013,054
• Time in Patent Office: 638 Days
• Field of Search: 701/1, 701/54, 701/58, 701/51, 701/56, 701/55, 477/115, 477/121, 477/125
• US Class Current: 701/51
• CPC Class Codes: F16H 2059/142 of driving resistance calculated from weight, slope, or the like
• CPC Class Codes: F16H 59/14 Inputs being a function of torque or torque demand
• CPC Class Codes: F16H 59/141 of rate of change of torque or torque demand
• CPC Class Codes: F16H 59/24 dependent on the throttle opening

Abstract

A change amount ΔTVO is computed as a deviation of a new value for the throttle opening representing engine load from a previous value. When the change amount ΔTVO is greater than or equal to a positive judgment level TH and engine load is changing rapidly in an increasing direction, computation of running resistance using a detected value for the throttle opening is stopped. However, since when the throttle opening is stable or the throttle opening is changing reducingly, a necessary and sufficient computational accuracy can be maintained, computation of the running resistance is not stopped, and control is carried out based on the computational results.

Claims

1. An apparatus for detecting running resistance of a vehicle comprising:

engine load detection means for detecting engine load;

running resistance computation means for computing vehicle running resistance based on parameters including at least the engine load detected by said engine load detection means, and outputting a signal for the computed running resistance; and

computation stopping means for stopping computation of the running resistance by said running resistance computation means when there is a rapid change in the engine load detected by said engine load detection means, and the engine load is changing increasingly.

2. An apparatus for detecting running resistance of a vehicle comprising:

engine load detection means for detecting engine load;

running resistance computation means for computing vehicle running resistance based on parameters including at least the engine load detected by said engine load detection means, and outputting a signal for the computed running resistance; and

computation stopping means which judges if the engine load detected by said engine load detection means is changing rapidly based on a judgment level which differs depending on the change direction of the engine load, and stops computation of the running resistance by said running resistance computation means when there is a rapid change in said engine load.

3. An apparatus for detecting running resistance of a vehicle according to claim 2, wherein said judgement level is set for each change direction of the engine load so that at the time of a reducing change in said engine load this is judged as a rapid change time in the engine load, only when a change more rapid than at the time of an increasing change is generated.

4. An apparatus for detecting running resistance of a vehicle according to claim 2, wherein said engine load detection means detects engine throttle valve opening as a value corresponding to engine load, and said computation stopping means judges said rapid change in engine load based on a throttle opening change amount per unit time.

5. An apparatus for detecting running resistance of a vehicle according to claim 2, wherein said engine load detection means detects engine throttle valve opening as a value corresponding to engine load, and said computation stopping means judges said rapid change in engine load based on the time required for the throttle valve to change by a previously set opening.

6. A method of detecting running resistance of a vehicle including detecting engine load and computing vehicle running resistance based on parameters including at least the detected engine load, and stopping said computation of running resistance when there is a rapid change in said engine load and said engine load is changing increasingly.

7. A method of detecting running resistance of a vehicle including detecting engine load and computing vehicle running resistance based on parameters including at least the detected engine load, and judging if the engine load is changing rapidly based on a judgment level which differs depending on the change direction of the engine load, and stopping said computation of running resistance when there is a rapid change in said engine load.

8. A method of detecting running resistance of a vehicle according to claim 7, wherein said judgment level is set for each change direction of the engine load so that at the time of a reducing change in said engine load this is judged as a rapid change time in the engine load, only when a change more rapid than at the time of an increasing change is generated.

9. A method of detecting running resistance of a vehicle according to claim 7, wherein engine throttle valve opening is detected as a value corresponding to engine load, and said rapid change in engine load is judged based on a throttle opening change amount per unit time.

10. A method of detecting running resistance of a vehicle according to claim 7, wherein engine throttle valve opening is detected as a value corresponding to engine load, and said rapid change in the engine load is judged based on the time required for the throttle valve to change by a previously set opening.