Exhibit 31(b)

                           SIGNATURES AND CERTIFICATES


I, Ann B. Ruple, certify that:

1.     I have reviewed this Annual Report on Form 10-K (the "report") of Clean
Diesel Technologies, Inc.:

2.     Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were
made, not misleading with respect to the period covered by this report;

3.     Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as
of and for the periods presented in this report;

4.     The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15 (e) and 15d-15 (e)) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15 (f) and 15d-15 (f))
for the registrant and have:

     a)   Designed such disclosure controls and procedures or caused such
          disclosure controls and procedures to be designed under our
          supervision to ensure that material information relating to the
          registrant, including its consolidated subsidiaries, is made known to
          us by others within those entities, particularly during the period in
          which this report is being prepared; and
     b)   Designed such internal control over financial reporting, or
          caused such internal control over financial reporting to be designed
          under our supervision, to provide reasonable assurance regarding the
          reliability of financial reporting and the preparation of financial
          statements for external purposes in accordance with generally accepted
          accounting principles;
     a)   Evaluated the effectiveness of the registrant's disclosure
          controls and procedures and presented in this report our conclusions
          about the effectiveness of the disclosure controls and procedures, as
          of the end of the period covered by this report based on such
          evaluation; and
     b)   disclosed in this report any change in the registrant's internal
          control over financial reporting that occurred during the registrant's
          fourth fiscal quarter of 2006 that has materially affected, or is
          reasonably likely to materially affect, the registrant's internal
          control over financial reporting; and

5.     The registrant's other certifying officers and I have disclosed, based on
our most recent evaluation of internal control over financial reporting, to the
registrant's auditors and the audit committee of the registrant's board of
directors (or persons performing the equivalent functions):

     a)   All significant deficiencies and material weaknesses in the
          design or operation of internal controls over financial reporting,
          which are reasonably likely to adversely affect the registrant's
          ability to record, process, summarize and report financial
          information; and
     b)   Any fraud, whether or not material, that involves management or
          other employees who have a significant role in the registrant's
          internal control over financial reporting;


Date:  March 30, 2007               By: /s/ Ann B. Ruple
                                        Ann B. Ruple
                                        Chief Financial Officer,
                                        Vice President and Treasurer